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