MAXIM MAX6469, MAX6484 Technical data

General Description

The MAX6469–MAX6484 are low-dropout linear regula­tors with a fully integrated microprocessor reset circuit.
Each is available with preset output voltages from +1.5V
to +3.3V in 100mV increments and delivers up to 300mA
of load current. These devices consume only 82µA of
supply current. The low supply current, low dropout volt­age, and integrated reset functionality make these
devices ideal for battery-powered portable equipment.

The MAX6469–MAX6484 include a reset output that indi­cates when the regulator output drops below standard
microprocessor supply tolerances (-7.5% or -12.5% of
nominal output voltage). This eliminates the need for an
external microprocessor supervisor, while ensuring that
supply voltages and clock oscillators have stabilized
before processor activity is enabled. Push-pull and open­drain active-low reset outputs are available, with reset
timeout periods of 2.5ms, 20ms, 150ms, or 1200ms (min).

The MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–
MAX6484 also have a shutdown feature that reduces the
supply current to 0.1µA (typ). The MAX6471–MAX6474/
MAX6479–MAX6482 offer a manual reset input to assert a
microprocessor reset while the regulator output is within
specification. The MAX6475/MAX6476/MAX6483/
MAX6484 feature a remote feedback sense pin for use
with an external NPN transistor for higher-current applica­tions. The MAX6469–MAX6476 are available in 6-pin
SOT23 and 8-pin thin QFN packages. The MAX6477–
MAX6484 are available in a 3 × 3 chip-scale package
(UCSP™). All devices are specified for operation from

-40°C to +85°C.

Applications

Hand-Held Instruments (PDAs, Palmtops)

PCMCIA Cards/USB Devices

Cellular/Cordless Telephones

CD/DVD Drives

Notebook Computers

Digital Cameras

Bluetooth Modules/Wireless LAN

Features

♦ 3 ✕ 3 UCSP, 6-Pin SOT23, and 8-Pin QFN Packages

♦ Preset +1.5V to +3.3V Output (100mV Increments)

♦ SET Pin for Adjustable Output Voltage

♦ 75µV

RMS

LDO Output Voltage Noise

(MAX6477–MAX6484)

♦ ±2.0% Accuracy Over Temperature

♦ Guaranteed 300mA Output Current

♦ Low Dropout Voltage

55mV at 150mA
114mV at 300mA

♦ 82µA Supply Current, 0.1µA Shutdown Current

♦ Input Reverse Current, Thermal and Short-Circuit

Protection

♦ Microprocessor Reset with Four Timeout Options
♦ Push-Pull or Open-Drain RESET

♦ Manual Reset Input

♦ Remote Feedback Sense

MAX6469–MAX6484

300mA LDO Linear Regulators with

Internal Microprocessor Reset Circuit

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2532; Rev 2; 6/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Note: The first “_ _”are placeholders for the output voltage levels

of the devices. Desired output voltages are set by the suffix found
in the Output Voltage Suffix Guide (Table 1). The third “_” is a
placeholder for the reset threshold accuracy. Desired reset
threshold accuracy is set by the suffix found in the Reset
Threshold Accuracy Guide (Table 2). The “_” following the D is a
placeholder for the reset timeout delay time. Desired reset timeout
delay time is set by the suffix found in the Reset Timeout Delay
Guide (Table 3). For example, the MAX6481BL30BD4-T has a

3.0V output voltage, 12.5% reset threshold tolerance, and a
1200ms (min) reset timeout delay. Sample stock is generally avail­able on standard versions only (Table 4). Standard versions
require a minimum order increment of 2.5k units. Nonstandard
versions must be ordered in 10k-unit increments. Contact factory
for availability.

Ordering Information continued at end of data sheet.

Pin Configurations appear at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

*Future product—contact factory for availability.

EVALUATION KIT

AVAILABLE

MAX6469UT_ _ _D_-T -40°C to +85°C 6 SOT23-6

MAX6469TA_ _ _D_* -40°C to +85°C 8 Thin QFN

MAX6470UT_ _ _D_-T -40°C to +85°C 6 SOT23-6

MAX6470TA_ _ _D_* -40°C to +85°C 8 Thin QFN

PART TEMP RANGE

PIN­PACKAGE

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

(All voltages referenced to GND, unless otherwise noted.)

IN, SHDN, OUT, FB ..................................................-0.3V to +7V

MR, SET .......................................................-0.3V to (V

IN

+ 0.3V)

RESET (push-pull) ...................................-0.3V to (V

OUT

+ 0.3V)

RESET (open drain)..................................................-0.3V to +7V

OUT Short Circuit .......................................................Continuous

Input/Output Current (all pins except IN and OUT) ............20mA

Continuous Power Dissipation (T

A

= +70°C)

3 x 3 UCSP (derate 10.5mW/°C above +70°C) ............840mW

6-Pin SOT23 (derate 9.1mW/°C above +70°C).............727mW

8-Pin Thin QFN

(derate 24.4mW/°C above +70°C)..............................1951mW

Operating Temperature Range ..........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VIN= (V

OUT

+ 0.5V) or +2.5V, whichever is greater, C

OUT

= 3.3µF, TA= -40°C to +85°C. Typical specifications are at TA= +25°C,

unless otherwise noted.) (Note 2)

Dual Mode is a trademark of Maxim Integrated Products, Inc.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: The MAX6477–MAX6484 are constructed using a unique set of packaging techniques that impose a limit on the thermal pro-

file the devices can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder
profiles recommended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and
Convection reflow. Pre-heating is required. Hand or wave soldering is not allowed.

Input Voltage Range V
Input Undervoltage Lockout V

Supply Current (Ground Current) I

Shutdown Supply Current I

REGULATOR CIRCUIT

Output Current 300 mA

Output Voltage Accuracy (Fixed
Output Voltage Operation,
Table 1) MAX6469–MAX6476

Output Voltage Accuracy (Fixed
Output Voltage Operation,
Table 1) MAX6477–MAX6484

Adjustable Output Voltage Range V
SET Reference Voltage V
SET Dual ModeTM Threshold 185 mV
SET Input Leakage Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

IN

UVLO

Q

SHDN

SET

SET

VIN falling 2.25 2.47 V
I

= 0 82 136

OUT

I

= 300mA 96

OUT

TA = +25°C 0.1 1 µA

1mA ≤ I

OUT

1mA ≤ I

OUT

1mA ≤ I

OUT

2mA ≤ I

OUT

2mA ≤ I

OUT

2mA ≤ I

OUT

(Note 3)

V

= 0, +1.2V (Note 3) ±20 ±100 nA

SET

≤ 150mA, TA = +25°C -1.3 +1.3
≤ 150mA, TA = -40°C to +85°C -2.3 +2.3

≤ 300mA, TA = -40°C to +85°C -2.7 +2.7
≤ 100mA, TA = +25°C -1.1 +1.1
≤ 100mA, TA = -40°C to +85°C -2.0 +2.0

≤ 300mA, TA = -40°C to +85°C

2.5 5.5 V

-2.5 +2.5

SET

1.200 1.229 1.258 V

5.0 V

µA

%

%

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal

Microprocessor Reset Circuit

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VIN= (V

OUT

+ 0.5V) or +2.5V, whichever is greater, C

OUT

= 3.3µF, TA= -40°C to +85°C. Typical specifications are at TA= +25°C,

unless otherwise noted.) (Note 2)

Dropout Voltage
(Notes 3, 4)

Output Current Limit VIN ≥ 2.5V (Note 3) 450 mA

Input Reverse Leakage Current
(OUT to IN Leakage Current)

Startup Time Response

SHDN Input Low Voltage V
SHDN Input High Voltage V
SHDN Input Current SHDN = VIN or GND -1 0.1 +1 µA

Thermal-Shutdown Temperature T
Thermal-Shutdown Hysteresis ∆T

Line Regulation

Load Regulation

Output Voltage Noise

RESET CIRCUIT

V

OUT

(V

FB

MAX6483/MAX6484) (Note 5)

V

OUT

(V

FB

MAX6483/MAX6484)

Reset Timeout Period
(Note 6)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

I

= 50mA 23 32

OUT

I

= 150mA 55 90

OUT

I

= 300mA 114 180

OUT

I

= 50mA 25 40

OUT

I

= 150mA 61 100

OUT

I

= 300mA 114 190

OUT

I

= 50mA 26 50

OUT

I

= 150mA 65 110

OUT

I

= 300mA 137 210

OUT

I

= 50mA 30 60

OUT

I

= 150mA 75 150

OUT

I

= 300mA 158 250

OUT

OUT

20 µs

0.7 × V

IN

180 °C

20 °C

0.09 %/V

≤

OUT

0.2 %

MAX6469–MAX6476 150

MAX6477–MAX6484 75

0.3 × V

Reset Threshold

for MAX6475/MAX6476/

∆V

SHDN

SHDN

V

THOUT

V

= +3.3V

OUT

(fixed output operation)

V

= +3.0V

OUT

(fixed output operation)

DO

V

= +2.8V

OUT

(fixed output operation)

V

= +2.5V

OUT

(fixed output operation)

= 4V, V

V

IN

Rising edge of V

= 5.5V, SHDN deasserted 0.01 1.5 µA

OUT

or SHDN to V

IN

within specification, RL = 68Ω, SET = GND,

= 10mA

I

OUT

IL

IH

V

= 1.5V, 2.5V ≤ VIN ≤ 5.5V,

OUT

= 10mA

I

OUT

V

= 1.5V, VIN = 2.5V, 1mA ≤ I

OUT

150mA

10Hz to 100kHz,
C

= 0.1µF,

IN

= 100mA,

I

OUT

V

= 1.5V

OUT

MAX64_ _ _ _ _ _ A 90 92.5 95

MAX64_ _ _ _ _ _ B 85 87.5 90

to Reset Delay

for MAX6475/MAX6476/

35 µs

D1 2.5 3.75 5.0

t

RP

D2 20 30 40

D3 150 225 300

D4 1200 1800 2400

IN

µV

%V

mV

V

V

RMS

OUT

ms

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

4 _______________________________________________________________________________________

Note 2: All devices are 100% production tested at +25°C and are guaranteed by correlation for TA= T

MIN

to T

MAX

.

Note 3: Guaranteed by design.
Note 4: Dropout voltage is defined as (V

IN

- V

OUT

) when V

OUT

is 2% below the value of V

OUT

for VIN= V

OUT(NOM)

+ 1V.

Note 5: MAX6473/MAX6474/MAX6481/MAX6482 are guaranteed by design for V

OUT

< 2.5V.

Note 6: Select the reset timeout period using the Reset Timeout Delay Guide (Table 3). Insert the appropriate suffix in the part number

when ordering.

ELECTRICAL CHARACTERISTICS (continued)

(VIN= (V

OUT

+ 0.5V) or +2.5V, whichever is greater, C

OUT

= 3.3µF, TA= -40°C to +85°C. Typical specifications are at TA= +25°C,

unless otherwise noted.) (Note 2)

Typical Operating Characteristics

(VIN= 5V, V

OUT

= 3.3V, C

OUT

= 3.3µF, TA= +25°C, unless otherwise noted.)

MR Input Low Voltage V

MR Input High Voltage V

MR Minimum Input Pulse 1µs
MR Glitch Rejection 120 ns
MR to Reset Delay 200 ns
MR Pullup Resistance MR to OUT 25 40 70 kΩ
RESET Output Voltage

(Open Drain)

Open-Drain Reset Output
Leakage Current

RESET Output Voltage Push-Pull

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

0.3 ×

V

OUT

1µA

V

I

LKG

V

V

IL

IH

OL

OL

OH

(Note 3)

V

≥ 1.0V, I

OUT

V

≥ 1.5V , I

OU T

(Note 3)

V

≥ 1.0V, I

OUT

V

≥ 1.5V , I

OU T

V

≥ 2.0V, I

OUT

deasserted

0.7 ×

V

OUT

= 50µA, RESET asserted 0.3

SINK

= 3.2m A, RES ET asser ted 0.4

S IN K

= 50µA, RESET asserted 0.3

SINK

= 3.2m A, RES ET asser ted 0.4

S IN K

SOURCE

= 500µA, RESET

0.8 ×

V

OUT

V

V

V

V

GROUND CURRENT vs. INPUT VOLTAGE

120

100

80

60

40

GROUND CURRENT (µA)

20

0

06

INPUT VOLTAGE (V)

(NO LOAD)

+85°C

+25°C

-40°C

GROUND CURRENT vs. INPUT VOLTAGE

(300mA LOAD)

120

100

MAX6469 toc01

80

60

40

GROUND CURRENT (µA)

20

54321

0

+85°C

+25°C

-40°C

INPUT VOLTAGE (V)

MAXIMUM TRANSIENT DURATION

vs. RESET THRESHOLD OVERDRIVE

150

125

MAX6469 toc02

PULSE DURATION (µs)

5432106

RESET ASSERTS ABOVE
THIS LINE

100

75

50

25

0

1 100

RESET THRESHOLD OVERDRIVE (mV)

10

MAX6469 toc03

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal

Microprocessor Reset Circuit

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VIN= 5V, V

OUT

= 3.3V, C

OUT

= 3.3µF, TA= +25°C, unless otherwise noted.)

DROPOUT VOLTAGE vs. LOAD CURRENT

125

V

= 3.3V

OUT

= 3.3µF

C

OUT

100

75

50

DROPOUT VOLTAGE (mV)

25

0

0 300

LOAD CURRENT (mA)

OUTPUT NOISE

VIN = 4.5V

= 3.3V

V

OUT

= 100mA

I

LOAD

PSRR vs. FREQUENCY

V

= 3.3V

OUT

= 3.3µF

C

OUT

= 30mA

I

LOAD

OUTPUT NOISE vs. FREQUENCY

VIN = 2.5V

= 1.5V

V

OUT

= 100mA

I

OUT

25020015010050

MAX6469 toc07

MAX6469 toc04

100µV/div

0

-10

-20

-30

PSRR (dB)

-40

-50

-60

0.01 1000

100

80

60

(µV)

RMS

V

40

20

FREQUENCY (kHz)

REGION OF STABLE C

vs. LOAD CURRENT

5

MAX6469 toc05

4

3

ESR (Ω)

OUT

2

C

1

0

1001010.1

0300

C

C

OUT

STABLE REGION

LOAD CURRENT (mA)

OUT

= 4.7µF

= 3.3µF

SHUTDOWN RESPONSE

MAX6469 toc08

I

= 50mA

LOAD

OUT

ESR

25020015010050

MAX6469 toc09

MAX6469 toc06

V

SHDN

5V/div

V

OUT

2V/div

500µs/div

0

10 100 10k 100k

1k

FREQUENCY (Hz)

20ms/div

LOAD-TRANSIENT RESPONSE

STARTUP RESPONSE

10µs/div

MAX6469 toc10

V

IN

2V/div

V

OUT

2V/div

LOAD-TRANSIENT RESPONSE

100µs/div

MAX6469 toc11

V

OUT

20mV/div

NEAR DROPOUT

10µs/div

V

IN

V

OUT

I

LOAD

MAX6469 toc12

= 5V

= 3.3V

= 100mA

V

OUT

5mV/div

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VIN= 5V, V

OUT

= 3.3V, C

OUT

= 3.3µF, TA= +25°C, unless otherwise noted.)

V

OUT

I

LOAD

LINE TRANSIENT RESPONSE

= 3.3V

= 10mA

100µs/div

MAX6469 toc13

5V

V

IN

500mV/div

4.5V

V

OUT

20mV/div
AC-COUPLED

RESET DELAY RESPONSE

200ms/div

MAX6469 toc14

V

IN

1V TO 4V
2V/div

RESET
2V/div

RESET RESPONSE TO MR

200ns/div

MAX6469 toc15

MR
2V/div

RESET
2V/div

RESET RESPONSE TO VIN RISING

200ms/div

MAX6469 toc16

RESET
2V/div

V

OUT

2V/div

V

IN

5V/div

NORMALIZED OUTPUT VOLTAGE

vs. TEMPERATURE

1.012

NORMALIZED TO +25°C

1.006

I

= 10mA

LOAD

1.000

I

= 300mA

I

= 150mA

LOAD

0.994

NORMALIZED OUTPUT VOLTAGE

0.988

-40 85

LOAD

TEMPERATURE (°C)

MAX6469 toc17

603510-15

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal

Microprocessor Reset Circuit

_______________________________________________________________________________________ 7

MAX6469/MAX6470/MAX6477/MAX6478 Pin Description

MAX6471/MAX6472/MAX6479/MAX6480 Pin Description

PIN BUMP

MAX6469/MAX6470 MAX6477/MAX6478

SOT23 QFN UCSP

1 1, 2 A1 IN Regulator Input. Bypass IN to GND with a 0.1µF capacitor.

2 3 A2 GND

34 A3 SHDN

45 C3 RESET

5 6 C2 SET

6 7, 8 C1 OUT

NAME FUNCTION

Ground. This pin also functions as a heatsink. Solder to large pads or
the circuit-board ground plane to maximize thermal dissipation.

Active-Low Shutdown Input. Connect SHDN to V
operation.

Active-Low Reset Output. RESET remains low while V
reset threshold. RESET remains low for the duration of the reset timeout
period after the reset conditions are terminated. RESET is available in
open-drain and push-pull configurations.

Feedback Input for Externally Setting the Output Voltage. Connect SET
to GND to select the preset output voltage. Connect SET to an external
resistor-divider network for adjustable output operation.

Regulator Output. Bypass OUT to GND with a minimum 3.3µF low-ESR
capacitor.

IN

PIN BUMP

MAX6471/MAX6472 MAX6479/MAX6480

SOT23 QFN UCSP

1 1, 2 A1 IN Regulator Input. Bypass IN to GND with a 0.1µF capacitor.

2 3 A2 GND

34 A3 MR

45 C3 RESET

NAME FUNCTION

Ground. This pin also functions as a heatsink. Solder to large pads or
the circuit-board ground plane to maximize thermal dissipation.

Active-Low Manual Reset Input. The reset output is asserted while MR
is pulled low and remains asserted for the duration of the reset timeout
period after MR transitions from low to high. Leave MR unconnected or
connect to V
(typ) to V

Active-Low Reset Output. RESET remains low while V
reset threshold or while MR is held low. RESET remains low for the
duration of the reset timeout period after the reset conditions are
terminated. RESET is available in open-drain and push-pull
configurations.

if not used. MR has an internal pullup resistor of 40kΩ

OUT

.

OUT

for normal

is below the

OUT

is below the

OUT

5 6 C2 SET

6 7, 8 C1 OUT

Feedback Input for Externally Setting the Output Voltage. Connect SET
to GND to select the preset output voltage. Connect SET to an external
resistor-divider network for adjustable output operation.

Regulator Output. Bypass OUT to GND with a minimum 3.3µF low-ESR
capacitor.

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

8 _______________________________________________________________________________________

MAX6473/MAX6474/MAX6481/MAX6482 Pin Description

MAX6475/MAX6476/MAX6483/MAX6484 Pin Description

PIN BUMP

MAX6473/MAX6474 MAX6481/MAX6482

SOT23 QFN UCSP

1 1, 2 A1 IN Regulator Input. Bypass IN to GND with a 0.1µF capacitor.

2 3 A2 GND

34 A3 SHDN

45 C3 RESET

56 C2 MR

6 7, 8 C1 OUT

NAME FUNCTION

Ground. This pin also functions as a heatsink. Solder to large pads or
the circuit-board ground plane to maximize thermal dissipation.

Active-Low Shutdown Input. Connect SHDN to V
operation.

Active-Low Reset Output. RESET remains low while V
reset threshold or while MR is held low. RESET remains low for the
duration of the reset timeout period after the reset conditions are
terminated. RESET is available in open-drain and push-pull
configurations.

Active-Low Manual Reset Input. The reset output is asserted while MR
is pulled low and remains asserted for the duration of the reset timeout
period after MR transitions from low to high. Leave MR unconnected or
connect to V
(typ) to V

Regulator Output. Bypass OUT to GND with a minimum 3.3µF (min)
low-ESR capacitor.

if not used. MR has an internal pullup resistor of 40kΩ

OUT

.

OUT

for normal

IN

OUT

is below the

PIN BUMP

MAX6475/MAX6476 MAX6483/MAX6484

SOT23 QFN UCSP

1 1, 2 A1 IN Regulator Input. Bypass IN to GND with a 0.1µF capacitor.

2 3 A2 GND

34 A3 SHDN

45 C3 RESET

5 6 C2 FB

6 7, 8 C1 OUT

NAME FUNCTION

Ground. This pin also functions as a heatsink. Solder to large pads or
the circuit-board ground plane to maximize thermal dissipation.

Active-Low Shutdown Input. Connect SHDN to V
operation.

Active-Low Reset Output. RESET remains low while FB is below the
reset threshold. RESET remains low for the duration of the reset
timeout period after the reset conditions are terminated. RESET is
available in open-drain and push-pull configurations.

Feedback Input for Linear Regulator Controller or Remote Sense
Applications. Connect FB to the external load (VCC) to obtain the fixed
output voltage.

Regulator Output. Bypass OUT to GND with a minimum 3.3µF low-ESR
capacitor.

IN

for normal

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal

Microprocessor Reset Circuit

_______________________________________________________________________________________ 9

Detailed Description

The MAX6469–MAX6484 are ultra-low, quiescent cur­rent, low-dropout linear regulators with an integrated
microprocessor reset circuit. These devices guarantee
300mA (min) drive capabilities and are available with
preset output voltages in 100mV increments between
+1.5V and +3.3V. The internal reset circuit monitors the
regulator output voltage and asserts the reset output
when the regulator output is below the microprocessor
supply tolerance.

Regulator

The regulator core operates with +2.5V to +5.5V input
voltage range. The output voltage is offered in 100mV
increments between +1.5V and +3.3V (contact factory
for other output voltage options). The MAX6469–
MAX6472/MAX6477–MAX6480 offer an adjustable out­put voltage implemented with an external resistor­divider network between OUT, SET, and GND (Figure

1). SET must be connected to either GND for fixed
V

OUT

or to an external divider for adjustable V

OUT

. The
MAX6469–MAX6472/MAX6477–MAX6480 automatically
determine the feedback path depending on the con­nection of SET. The Typical Operating Circuit shows a
typical connection for the MAX6469. OUT is an internal­ly regulated low-dropout (LDO) linear regulator that
powers a microprocessor.

Reset Circuit

The reset supervisor circuit is fully integrated in the
MAX6469–MAX6484 and uses the same reference volt­age as the regulator. Two supply tolerance reset
thresholds, -7.5% and -12.5%, are provided for each
type of device.

-7.5% Reset: Reset does not assert until the regulator
output voltage is at least -5% out of tolerance and
always asserts before the regulator output voltage is

-10% out of tolerance.

-12.5% Reset: Reset does not assert until the regulator
output voltage is at least -10% out of tolerance and
always asserts before the regulator output voltage is

-15% out of tolerance.

RESET

Output

A µP’s reset input starts the µP in a known state. The
MAX6469–MAX6484 µP supervisory circuits assert
RESET during power-up, power-down, and brownout
conditions. RESET asserts when the input voltage is
below the undervoltage lockout threshold. RESET
asserts when V

OUT

is below the reset threshold and
remains asserted for at least the minimum selected reset
timeout period (tRP, Table 3) after VINrises above the
undervoltage lockout threshold and V

OUT

rises above

the reset threshold. RESET asserts when MR is pulled
low (MAX6471–MAX6474/MAX6479–MAX6482). RESET
asserts when SHDN is pulled low (MAX6469/
MAX6470/MAX6473–MAX6478/MAX6481–MAX6484).

Shutdown

(MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–

MAX6484 only)

SHDN allows the regulator to shut down, thereby reduc­ing the total I

IN

consumption of the device. SHDN pro-

vides a digitally controlled active-low shutdown. In
shutdown mode, the pass transistor, control circuit, and
reference turn off to reduce the supply current to below

0.1µA. Connect SHDN to IN for normal operation.

Manual Reset Input

(MAX6471–MAX6474/MAX6479–MAX6482 only)

Many µP-based products require manual reset capabil­ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset while the regulator output voltage is still
within tolerance.

Reset remains asserted while MR is low and for the
reset timeout period (tRP) after MR returns high. The

MR input has an internal pullup of 40kΩ (typ) to OUT.
MR can be driven with TTL/CMOS logic levels or with

open-drain/collector outputs. Connect a normally open
switch from MR to GND to create a manual reset func­tion; external debounce circuitry is not required. If MR
is driven from long cables or the device is used in a
noisy environment, connect a 0.1µF capacitor from MR
to GND to provide additional noise immunity.

Feedback Input

(MAX6475/MAX6476/MAX6483/MAX6484 only)

The feedback input (FB) connects to an internal resistor­divider network (Functional Diagram). FB is not internally
connected to V

OUT

, and as a result can be used to

Figure 1. Adjustable Output Voltage Configuration

2.5V TO 5.5V

IN

OUT

MAX6469–MAX6472
MAX6477–MAX6480

MANUAL

RESET

( ) ARE FOR MAX6471/MAX6472/MAX6479/MAX6480 ONLY

(MR)

SET

GND

R1

C

OUT

R2

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

10 ______________________________________________________________________________________

remotely sense the output voltage of the device. Using
FB with an external NPN transistor, the current drive
capability can be increased according to the following
equation (Figure 2):

I

OUT(TOTAL)

= I

OUT

✕ (β+1)

The external NPN pass transistor must meet specifica­tions for current gain, power dissipation, and collector
current. The beta influences the maximum output cur­rent the circuit can deliver. The largest guaranteed out­put current is given by I

LOAD

(max) = 300mA × beta

(min). The transistor’s rated power dissipation must
exceed the actual power dissipated in the transistor.
The power dissipated (PD) equals the maximum load
current (I

LOAD

(max)) times the maximum input-to-out-

put voltage differential: PD = I

LOAD

(max) × (V

IN

(max) -

V

OUT

). The rated transistor collector current must

exceed the maximum load current.

Reverse Leakage Protection

Reverse OUT to IN Current

An internal circuit monitors the MAX6469–MAX6484
input and output voltages. When the output voltage is
greater than the input voltage, the internal IN-to-OUT
pass transistor and parasitic diode turn off. An external
voltage applied to OUT does not reverse charge a bat­tery or power source applied to IN (the leakage path
from OUT to IN is 0.01µA typ). When the output voltage
exceeds the input voltage, OUT powers the device and
shutdown must be logic high (greater than 0.7

✕

V

OUT

).

RESET asserts until IN exceeds OUT and OUT is above
the specified V

THOUT

threshold (based on the selected

or adjusted regulator OUT nominal voltage).

Reverse OUT to Ground Current

The MAX6469–MAX6484 maintain a low OUT-to-GND
reverse-current flow when the IN power source is
removed. When IN floats (input battery removed) and
SHDN is pulled up to V

OUT

(by an external diode), the

OUT-to-GND current through the LDO is 40µA (typ). The
regulator output can be held up with an external super
capacitor or backup battery at OUT until the IN battery is
replaced. The RESET output is asserted while the IN bat­tery is removed to place the system in a low-power
mode. Volatile memory content is maintained until the
super capacitor or battery voltage drops below RAM
standby specifications. RESET deasserts when the IN
battery has been replaced and OUT exceeds the
desired reset threshold. For nonrechargeable backup
battery applications, place a reverse diode between
OUT and the backup battery (to prevent battery charg­ing). The external diode does not affect the regulator’s
dropout voltage because it is not between the LDO out­put and the processor/memory Vcc supply. The diode
can be replaced with a current-limiting resistor for
rechargeable backup battery applications.

Current Limit

The MAX6469–MAX6484 include an internal current­limit circuit that monitors and controls the pass transis­tor’s gate voltage, limiting the output current to 450mA
(min). The output can be shorted to ground indefinitely
without damaging the part.

Thermal Shutdown

When the junction temperature (TJ) exceeds +180°C
(typ), the thermal sensor signals the shutdown logic,
turning off the pass transistor and allowing the IC to

Figure 3. Battery Backup

Figure 2. High-Current, External Transistor Application

5.0V

IN

OUT

MAX6475/MAX6476
MAX6483/MAX6484

GND

FB

RESET

R

0.1µF3.3µF330Ω

PULLUP

VCC = 3.3V1A TOTAL CURRENT

µP

REMOVABLE

LITHIUM ION OR

3-CELL

ALKALINE

REMOVABLE

LITHIUM ION OR

3-CELL

ALKALINE

MAX6469–

MAX6484

SHDN

IN

MAX6469–

MAX6484

SHDN

OUTIN

OUT

3.3µF

3.0V

LITHIUM

3.3µF

SUPERCAP

µP MEMORY

µP MEMORY

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal

Microprocessor Reset Circuit

______________________________________________________________________________________ 11

cool. The thermal sensor turns the pass transistor on
again after the IC’s junction temperature cools by 20°C,
resulting in a pulsed output during continuous thermal
overload conditions. Thermal overload protection is
designed to protect the MAX6469–MAX6484 in the
event of fault conditions. For continuous operation, do
not exceed the absolute maximum junction temperature
rating of T

JMAX

= +150°C.

Operating Region and Power Dissipation

The MAX6469–MAX6484’s maximum power dissipation
depends on the thermal resistance of the case and cir­cuit board, the temperature difference between the die
junction and the ambient air, and the rate of airflow. The
power dissipation across the device is:

P = I

OUT(VIN

- V

OUT

)

The maximum power dissipation is:

P

MAX

= (TJ- TA) / (ØJB+ ØBA)

where TJ- TAis the temperature difference between the
die junction and the surrounding air, ØJB(or ØJC) is the
thermal resistance of the package, and ØBAis the ther­mal resistance through the PC board, copper traces,
and other materials to the surrounding air. The
MAX6469–MAX6476 QFN package ØJC= 41°C/W, and
the MAX6469–MAX6476 SOT package ØJC= 110°C/W.

The MAX6469–MAX6484’s ground pin (GND) performs
the dual function of providing an electrical connection
to the system ground and channeling heat away.
Connect GND to the system ground using a large pad
or ground plane. For continuous operation, do not
exceed the absolute maximum junction temperature
rating of T

JMAX

= +150°C.

Applications Information

Output Voltage Selection

The MAX6469–MAX6484 feature dual-mode operation:
they operate in either a preset output voltage mode
or an adjustable mode. In preset voltage mode, internal
feedback resistors set the MAX6469–MAX6484’s output
from +1.5V to +3.3V (Table 1). Select this mode by con­necting SET to ground (MAX6469–MAX6472/
MAX6477–MAX6480). In adjustable mode, select an
output between 1.25V and 5.5V using two external
resistors connected as a voltage-divider to SET (Figure

1). The output voltage is set by the following equation:

V

OUT

= V

SET

(1 + R1 / R2)

where V

SET

= 1.23V. To simplify resistor selection:

R1 = R2(V

OUT

/ V

SET

- 1)

Choose R2 = 50kΩ to maintain stability, accuracy and
high-frequency power-supply rejection. Avoid selecting

resistor values greater than 100kΩ. In preset voltage
mode, the impedance between SET and ground should
always be less than 50kΩ. In most applications, con­nect SET directly to ground.

Low-Noise UCSP Output

MAX6477–MAX6484 UCSP products include internal fil­tering to yield low output noise without an additional
external bypass capacitor. The devices yield 75µV

RMS

(typ) output noise (for V

OUT

= 3.0V) and 150µV

RMS

(for

V

OUT

= 3.3V). This low-noise feature makes the

MAX6477–MAX6484 ideal for audio applications.

Capacitor Selection and Regulator

Stability

For stable operation over the full temperature range
and with load currents up to 300mA, use a 3.3µF (min)
ceramic output capacitor with an ESR <0.2Ω. To
reduce noise and improve load transient response, sta­bility, and power-supply rejection, use large output
capacitor values such as 10µF.

Note that some ceramic capacitors exhibit large capac­itance and ESR variation with temperature. With capaci­tor dielectrics such as Z5U and Y5V, use 4.7µF or more
to ensure stability over temperature. With X7R or X5R
capacitor dielectrics, 3.3µF should be sufficient at all
operating temperatures. Higher ESR capacitors require
more capacitance to maintain stability. A graph of the
Region of Stable ESR vs. Load Current is shown in the
Typical Operating Characteristics.

To improve power-supply rejection and transient
response, use a 1µF capacitor between IN and GND.

The MAX6469–MAX6484 remain stable with purely
resistive loads or current loads up to 300mA.

Reset Transient Immunity

The reset circuit is relatively immune to short-duration,
falling V

OUT

transients. The Typical Operating
Characteristics section shows a graph of the Maximum
Transient Duration vs. Reset Threshold Overdrive for
which reset is not asserted. The graph was produced
using falling V

OUT

transients starting at V

OUT

and end­ing below the reset threshold by the magnitude indicat­ed (reset threshold overdrive). The graph shows the
maximum pulse width that a falling V

OUT

transient can
typically have without triggering a reset pulse. As the
amplitude of the transient increases (i.e., goes further
below the reset threshold), the maximum allowable
pulse width decreases. Typically, a V

OUT

transient that
goes only 10mV below the reset threshold and lasts for
75µs does not trigger a reset pulse.

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

12 ______________________________________________________________________________________

Power Dissipation Consideration

For the SOT23 package, any pin except the SET pin
can be used as a heatsink. If the SET pin is used as a
heatsink, excessive parasitic capacitance can affect
stability. For the QFN package, the exposed metal pad
on the back side of a package connects to GND of the
chip. This metal pad can be used as a heatsink.

UCSP Consideration

For general UCSP package information and PC layout
considerations, refer to Maxim Application Note: Wafer-
Level Chip-Scale Package.

UCSP Reliability

The chip-scale package (UCSP) represents a unique
packaging form factor that might not perform equally to
a packaged product through traditional mechanical
reliability tests. CSP reliability is integrally linked to the
user’s assembly methods, circuit-board material, and
usage environment. The user should closely review
these areas when considering a CSP package.
Performance through operating life test and moisture
resistance remains uncompromised, because it is pri­marily determined by the wafer-fabrication process.

Mechanical stress performance is a greater considera­tion for a CSP package. CSPs are attached through
direct solder contact to the user’s PC board, forgoing
the inherent stress relief of a packaged product’s lead
frame. Solder-joint contact integrity must be considered.
Information on Maxim’s qualification plan, test data, and
recommendations are detailed in the UCSP application
note on Maxim’s website at www.maxim-ic.com.

Table 1. Output Voltage Suffix Guide

Note: Factory-trimmed custom output voltages may be avail­able; contact factory for availability.

Table 2. Reset Threshold Accuracy Guide

Table 3. Reset Timeout Delay Guide

SUFFIX

15 1.5

16 1.6

17 1.7

18 1.8

19 1.9

20 2.0

21 2.1

22 2.2

23 2.3

24 2.4

25 2.5

26 2.6

27 2.7

28 2.8

285 2.85

29 2.9

30 3.0

31 3.1

32 3.2

33 3.3

OUTPUT

VOLTAGE (V)

SUFFIX

A-7.5

B -12.5

SUFFIX

D1 2.5

D2 20

D3 150

D4 1200

V

RESET

OUT

TOLERANCE (%)

MINIMUM RESET

TIMEOUT PERIOD (ms)

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal

Microprocessor Reset Circuit

______________________________________________________________________________________ 13

Table 4. Standard Versions

MAX6469TA15BD3 ADO

MAX6469TA18AD3 ADP
MAX6469TA25BD3 ADQ

MAX6469TA28AD3 ACT

MAX6469TA30BD3 ADR

MAX6469TA33AD3 ADS
MAX6469UT15BD3 ABKS

MAX6469UT18AD3 ABKT

MAX6469UT25BD3 ABKU

MAX6469UT28AD3 ABFF
MAX6469UT285AD3 ABMZ

MAX6469UT285BD3 ABNA

MAX6469UT30BD3 ABKV

MAX6469UT33AD3 ABKW
MAX6470TA15BD3 ADT

MAX6470TA18AD3 ADU

MAX6470TA25BD3 ADV

MAX6470TA28AD3 ADW
MAX6470UT285AD3 ABNB

MAX6470UT285BD3 ABNC

MAX6470TA30BD3 ADY

MAX6470TA33AD3 ACU
MAX6470UT15BD3 ABKX

MAX6470UT18AD3 ABKY

MAX6470UT25BD3 ABKZ

MAX6470UT28AD3 ABLA
MAX6470UT30BD3 ABLB

MAX6470UT33AD3 ABLC

MAX6471TA15AD3 ADZ

MAX6471TA18BD3 AEA
MAX6471TA25AD3 AEB

MAX6471TA28BD3 AEC

MAX6471TA30AD3 AED

MAX6471TA33BD3 AEE
MAX6471UT15AD3 ABLD

MAX6471UT18BD3 ABLE

MAX6471UT25AD3 ABLF

DEVICE TOP MARK

DEVICE TOP MARK

MAX6471UT28BD3 ABLG

MAX6471UT30AD3 ABLH

MAX6471UT33BD3 ABLI
MAX6472TA15AD3 AEF

MAX6472TA18BD3 ACW

MAX6472TA25AD3 AEG

MAX6472TA28BD3 AEH
MAX6472TA30AD3 AEI

MAX6472TA33BD3 AEJ

MAX6472UT15AD3 ABLJ

MAX6472UT18BD3 ABFI
MAX6472UT25AD3 ABLK

MAX6472UT28BD3 ABLL

MAX6472UT30AD3 ABLM

MAX6472UT33BD3 ABLN
MAX6473TA15AD3 AEK

MAX6473TA18BD3 AEL

MAX6473TA25AD3 AEM

MAX6473TA28BD3 AEN
MAX6473TA30AD3 AEO

MAX6473TA33BD3 AEP

MAX6473UT15AD3 ABLO

MAX6473UT18BD3 ABLP
MAX6473UT25AD3 ABLQ

MAX6473UT28BD3 ABLR

MAX6473UT30AD3 ABLS

MAX6473UT33BD3 ABLT
MAX6474TA15AD3 AEQ

MAX6474TA18BD3 AER

MAX6474TA25AD3 AES

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

14 ______________________________________________________________________________________

Table 4. Standard Versions (continued)

Sample stock is generally available on standard versions only.
Standard versions require a minimum order increment of 2.5k
units. Nonstandard versions must be ordered in 10k-unit incre­ments. Contact factory for availability.

MAX6474TA28BD3 AET
MAX6474TA30AD3 AEU

MAX6474TA33BD3 AEV

MAX6474UT15AD3 ABLU

MAX6474UT18BD3 ABLV
MAX6474UT25AD3 ABLW

MAX6474UT28BD3 ABLX

MAX6474UT30AD3 ABLY

MAX6474UT33BD3 ABLZ
MAX6475TA15BD3 AEW

MAX6475TA18AD3 AEX

MAX6475TA25BD3 AEY

MAX6475TA28AD3 AEZ
MAX6475TA30BD3 AFA

MAX6475TA33AD3 ACZ

MAX6475UT15BD3 ABMA

MAX6475UT18AD3 ABMB
MAX6475UT25BD3 ABMC

MAX6475UT28AD3 ABMD

MAX6475UT30BD3 ABME

MAX6475UT33AD3 ABFL
MAX6476TA15BD3 AFB

MAX6476TA18AD3 AFC

MAX6476TA25BD3 AFD

MAX6476TA28AD3 AFE
MAX6476TA30BD3 AEF

MAX6476TA33AD3 AFG

MAX6476UT15BD3 ABMF

MAX6476UT18AD3 ABMG
MAX6476UT25BD3 ABMH

MAX6476UT28AD3 ABMI

MAX6476UT30BD3 ABMJ

MAX6476UT33AD3 ABMK
MAX6477BL15BD3 ABW

MAX6477BL18AD3 ABG

MAX6477BL25BD3 ABX

MAX6477BL28AD3 ABY
MAX6477BL30BD3 ABZ

MAX6477BL33AD3 ACA

MAX6478BL15BD3 ACB

MAX6478BL18AD3 ACC
MAX6478BL25BD3 ACD

DEVICE TOP MARK

DEVICE TOP MARK

MAX6478BL28AD3 ACE
MAX6478BL30BD3 ACF

MAX6478BL33AD3 ACG

MAX6479BL15AD3 ACH

MAX6479BL18BD3 ACI
MAX6479BL25AD3 ACJ

MAX6479BL28BD3 ACK

MAX6479BL30AD3 ACL

MAX6479BL33BD3 ACM
MAX6480BL15BD3 ACN

MAX6480BL18AD3 ACO

MAX6480BL25BD3 ACP

MAX6480BL28AD3 ACQ
MAX6480BL30BD3 ACR

MAX6480BL33AD3 ABJ

MAX6481BL15BD3 ACS

MAX6481BL18AD3 ACT
MAX6481BL25BD3 ACU

MAX6481BL28AD3 ACV

MAX6481BL30BD3 ACW

MAX6481BL33AD3 ACX
MAX6482BL15BD3 ACY

MAX6482BL18AD3 ACZ

MAX6482BL25BD3 ADA

MAX6482BL28AD3 ADB
MAX6482BL30BD3 ADC

MAX6482BL33AD3 ADD

MAX6483BL15BD3 ADE

MAX6483BL18AD3 ADF
MAX6483BL25BD3 ADG

MAX6483BL28AD3 ADH

MAX6483BL30BD3 ADI

MAX6483BL33AD3 ADJ
MAX6484BL15BD3 ADK

MAX6484BL18AD3 ADL

MAX6484BL25BD3 ADM

MAX6484BL28AD3 ADN
MAX6484BL30BD3 ADO

MAX6484BL33AD3 ADP

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal

Microprocessor Reset Circuit

______________________________________________________________________________________ 15

Pin Configurations

TOP VIEW

1 6 OUT

IN

GND

MAX6469

2

MAX6470

34

5SET

RESETSHDN

SOT23-6

GNDIN3

MR

1

2IN

4

MAX6471
MAX6472

87OUT

OUT

SET

6

RESET

5

THIN QFN

1 6 OUT

IN

GND

2

34

MAX6475
MAX6476

GNDIN3

SHDN

1

2IN

4

MAX6469
MAX6470

87OUT

OUT

6

SET

5

RESET

THIN QFN

1 6 OUT

IN

GND

MAX6473

2

MAX6474

34

5MR

RESETSHDN

SOT23-6

5FB

RESETSHDN

GNDIN3

SHDN

1

2IN

MAX6475
MAX6476

4

1 6 OUT

IN

GND

SHDN

MAX6471

2

MAX6472

34

5 SET

RESETMR

SOT23-6

GNDIN3

1

2IN

4

MAX6473
MAX6474

87OUT

6

5

OUT

MR

RESET

THIN QFN

87OUT

OUT

FB

6

RESET

5

UCSP DEVICES SHOWN AS
MOUNTED ON PC BOARD.
BALL SOLDERED DOWN.

OUT

SET

OUT

SET

SOT23-6

C1

MAX6477

C2

MAX6478

C3

3 x 3 UCSP

C1

MAX6479

C2

MAX6480

C3

3 x 3 UCSP

THIN QFN

A1

IN

A2

GND

A3

SHDNRESET

OUT

MR

C1

C2

C3

MAX6481
MAX6482

A1

IN

A2

GND

A3

SHDNRESET

3 x 3 UCSP

A1

IN

A2

GND

A3

MRRESET

OUT

C1

MAX6483

C2

FB

MAX6484

C3

A1

IN

A2

GND

A3

SHDNRESET

3 x 3 UCSP

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

16 ______________________________________________________________________________________

Functional Diagrams

Typical Operating Circuit

Chip Information

TRANSISTOR COUNT: 1041
PROCESS: BiCMOS

THERMAL SENSOR

MOS DRIVER WITH

CURRENT LIMIT

SHDN

REVERSE

REVERSE

IN

LEAKAGE

PROTECTION

ERROR
AMP

THERMAL SENSOR

MOS DRIVER WITH

CURRENT LIMIT

OUT

FB

SHDN*

IN

LEAKAGE

PROTECTION

ERROR
AMP

FEEDBACK-MODE

COMPARATOR

OUT

SET**

1.23V

MAX6475/MAX6476
MAX6483/MAX6484

RESET
COMPARATOR

GND

RESET

TIMEOUT

OUTPUT

STAGE

2.5V TO 5.5V

IN

3.3µF

V

CC

RESET

µP

GND

SHDN

MAX6469/MAX6470
MAX6477/MAX6478

SET

RESET

GND

OUT

RESET

1.23V

RESET
COMPARATOR

GND

*MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–MAX6484
**MAX6469–MAX6472/MAX6477–MAX6480
***MAX6471–MAX6474/MAX6479–MAX6482

185mV

RESET

TIMEOUT

OUTPUT

STAGE

MAX6469–MAX6474
MAX6477–MAX6482

MR***

RESET

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal

Microprocessor Reset Circuit

______________________________________________________________________________________ 17

Ordering Information (continued)

Note: The first “_ _

”

are placeholders for the output voltage levels
of the devices. Desired output voltages are set by the suffix found
in the Output Voltage Suffix Guide (Table 1). The third “_” is a
placeholder for the reset threshold accuracy. Desired reset
threshold accuracy is set by the suffix found in the Reset
Threshold Accuracy Guide (Table 2). The “_” following the D is a
placeholder for the reset timeout delay time. Desired reset timeout
delay time is set by the suffix found in the Reset Timeout Delay
Guide (Table 3). For example, the MAX6481BL30BD4-T has a

3.0V output voltage, 12.5% reset threshold tolerance, and a
1200ms (min) reset timeout delay. Sample stock is generally avail­able on standard versions only (Table 4). Standard versions
require a minimum order increment of 2.5k units. Nonstandard
versions must be ordered in 10k-unit increments. Contact factory
for availability.

*Future product—contact factory for availability.

PART TEMP RANGE

MAX6471UT_ _ _D_-T -40°C to +85°C 6 SOT23-6

MAX6471TA_ _ _D_* -40°C to +85°C 8 Thin QFN

MAX6472UT_ _ _D_-T -40°C to +85°C 6 SOT23-6

MAX6472TA_ _ _D_* -40°C to +85°C 8 Thin QFN

MAX6473UT_ _ _D_-T -40°C to +85°C 6 SOT23-6

MAX6473TA_ _ _D_* -40°C to +85°C 8 Thin QFN

MAX6474UT_ _ _D_-T -40°C to +85°C 6 SOT23-6

MAX6474TA_ _ _D_* -40°C to +85°C 8 Thin QFN

MAX6475UT_ _ _D_-T -40°C to +85°C 6 SOT23-6

MAX6475TA_ _ _D_* -40°C to +85°C 8 Thin QFN

MAX6476UT_ _ _D_-T -40°C to +85°C 6 SOT23-6

MAX6476TA_ _ _D_* -40°C to +85°C 8 Thin QFN

MAX6477BL_ _ _D_-T -40°C to +85°C 6 UCSP

MAX6478BL_ _ _D_-T -40°C to +85°C 6 UCSP

MAX6479BL_ _ _D_-T -40°C to +85°C 6 UCSP

MAX6480BL_ _ _D_-T -40°C to +85°C 6 UCSP

MAX6481BL_ _ _D_-T -40°C to +85°C 6 UCSP

MAX6482BL_ _ _D_-T -40°C to +85°C 6 UCSP

MAX6483BL_ _ _D_-T -40°C to +85°C 6 UCSP

MAX6484BL_ _ _D_-T -40°C to +85°C 6 UCSP

PIN­PACKAGE

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

18 ______________________________________________________________________________________

Selector Guide

PART SET SHDN MR FB

MAX6469 √√—— √ — SOT23-6/8-QFN
MAX6470 √√—— — √ SOT23-6/8-QFN
MAX6471 √ — √ — √ — SOT23-6/8-QFN
MAX6472 √ — √ —— √ SOT23-6/8-QFN
MAX6473 — √√— √ — SOT23-6/8-QFN
MAX6474 — √√—— √ SOT23-6/8-QFN
MAX6475 — √ — √√ — SOT23-6/8-QFN
MAX6476 — √ — √ — √ SOT23-6/8-QFN
MAX6477 √√—— √ — 3 x 3 UCSP B9-3
MAX6478 √√—— — √ 3 x 3 UCSP B9-3
MAX6479 √ — √ — √ — 3 x 3 UCSP B9-3
MAX6480 √ — √ —— √ 3 x 3 UCSP B9-3
MAX6481 — √√— √ — 3 x 3 UCSP B9-3
MAX6482 — √√—— √ 3 x 3 UCSP B9-3
MAX6483 — √ — √√ — 3 x 3 UCSP B9-3
MAX6484 — √ — √ — √ 3 x 3 UCSP B9-3

PUSH-PULL

RESET

OPEN-DRAIN

RESET

PACKAGE

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal

Microprocessor Reset Circuit

______________________________________________________________________________________ 19

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

6LSOT.EPS

PACKAGE OUTLINE, SOT-23, 6L

21-0058

1

F

1

9LUCSP, 3x3.EPS

PACKAGE OUTLINE, 3x3 UCSP

21-0093

1

I

1

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

MAX6469–MAX6484

300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

PIN 1
INDEX
AREA

D

E

A

A2

b

E2

DETAIL A

e

D2

C0.35

L

PIN 1 ID

1N1

[(N/2)-1] x e

REF.

6, 8, &10L, QFN THIN.EPS

NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY

COMMON DIMENSIONS

MIN. MAX.

SYMBOL

0.70 0.80

A

2.90 3.10

D

2.90 3.10

E

0.00 0.05

A1

L

0.20 0.40

k

0.25 MIN.

A2 0.20 REF.

PACKAGE VARIATIONS

PKG. CODE

T633-1 1.50–0.10D22.30–0.10

N

6

1.50–0.10

2.30–0.10T833-1 8

A

E2

0.95 BSCeMO229 / WEEA

0.65 BSC

A1

L

JEDEC SPEC

MO229 / WEEC

C

L

e

0.40–0.05b1.90 REF

0.25–0.05 2.00 REFMO229 / WEED-30.50 BSC1.50–0.10 2.30–0.1010T1033-1

k

C

L

e

DALLAS

SEMICONDUCTOR

PROPRIETARY INFORMATION

TITLE:

PACKAGE OUTLINE, 6, 8 & 10L,

TDFN, EXPOSED PAD, 3x3x0.80 mm

APPROVAL

[(N/2)-1] x e

1.95 REF0.30–0.05

DOCUMENT CONTROL NO. REV.

21-0137 D

L

1

2

DALLAS

SEMICONDUCTOR

PROPRIETARY INFORMATION

TITLE:

PACKAGE OUTLINE, 6, 8 & 10L,
TDFN, EXPOSED PAD, 3x3x0.80 mm

DOCUMENT CONTROL NO.APPROVAL

21-0137

REV.

2

2

D