MAXIM MAX8869 User Manual

General Description

The MAX8869 low-dropout linear regulator operates
from a +2.7V to +5.5V input and delivers a guaranteed
1A load current with a low 200mV dropout. The high­accuracy (±1%) output voltage is preset at +5V, +3.3V,
+2.5V, +1.8V, or +1.0V or is adjustable from +0.8V to
+5V with an external resistor-divider.

The MAX8869 uses MicroCap™ technology and
requires only a small 1µF output capacitor for guaran­teed stability. An internal PMOS pass transistor allows
low 500µA supply current, making this regulator useful
for networking and telecom hardware as well as bat­tery-operated equipment. Other features include soft­start, low-power shutdown, short-circuit protection, and
thermal shutdown protection.

The MAX8869 is available in a 1.5W, 16-pin TSSOP
package, which is 30% smaller than a SOT223 and only

1.1mm high.

________________________Applications

Telecom Hardware

Network Equipment

Mobile Phone Base Stations

Personal Computers

Notebook Computers

Features

♦ Guaranteed 1A Output Current

♦ Stable with C

OUT

= 1µF

♦ Low 200mV Dropout at 1A

♦ ±1% Output Voltage Accuracy

Preset at +5V, +3.3V, +2.5V, +1.8V, or +1.0V
and Adjustable from +0.8V to +5.0V

♦ 54dB PSRR at 100kHz

♦ Adjustable Soft-Start

♦ 3ms Reset Output

♦ Foldback Output Current Limit

♦ Thermal Overload Protection

♦ High-Power 16-Pin TSSOP Package (1.5W)

30% Smaller than SOT223 (only 1.1mm high)

MAX8869

1A, MicroCap, Low-Dropout,

Linear Regulator

________________________________________________________________ Maxim Integrated Products 1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

N.C. N.C.

OUT

OUT

OUT

OUT

SET

GND

N.C.

TOP VIEW

MAX8869

TSSOP-EP

IN

IN

RST

IN

IN

SHDN

SS

Pin Configuration

IN

IN

IN

IN

SHDN

SS

OUT

OUT

OUT

OUT

RST

SET

GND

ON

OFF

1µF

1µF

IN

+2.7V TO +5.5V

OUT

UP TO 1A

RESET

OUTPUT

MAX8869

Typical Operating Circuit

19-1692; Rev 0; 8/00

For free samples and the latest literature, visit www.maxim-ic.com or phone [phone].
For small orders, phone [phone].

Ordering Information

MicroCap is a trademark of Maxim Integrated Products.

PART

TEMP.

RANGE

PIN­PACKAGE

V

OUT

*

(V)

MAX8869EUE50

+5.0

MAX8869EUE33

+3.3

MAX8869EUE25

+2.5

MAX8869EUE18

+1.8

MAX8869EUE10

+1.0

*Or adjustable from +0.8V to +5.0V. Contact factory for other
preset output voltages.
**EP = Exposed pad.

-40°C to +85°C 16 TSSOP-EP**

-40°C to +85°C 16 TSSOP-EP

-40°C to +85°C 16 TSSOP-EP

-40°C to +85°C 16 TSSOP-EP

-40°C to +85°C 16 TSSOP-EP

MAX8869

1A, MicroCap, Low-Dropout,
Linear Regulator

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= +2.7V or V

OUT(NOM)

+ 0.5V (whichever is greater), SHDN = IN, SS = open, SET = GND, C

OUT

= 1µF, TA= 0°C to +85°C,

unless otherwise noted. Typical values are at T

A

= +25°C.)

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.

IN, SHDN, RST, SS to GND ......................................-0.3V to +6V

OUT, SET to GND ........................................-0.3V to (V

IN

+ 0.3V)

Output Short-Circuit Duration ........................................Indefinite

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TSSOP-EP (derate 19mW/°C above +70°C).........1.5W

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage Range V

IN

2.7 5.5 V

Input Undervoltage Lockout Typical hysteresis = 50mV

V

Output Voltage Accuracy I

OUT

= 1mA, TA = +85°C-11%

SET Regulation Voltage
(Adjustable Mode)

I

OUT

= 150mA, TA = +85°C

808 mV

Line Regulation

VIN = V

OUT

+ 0.5V to +5.5V, I

OUT

= 10mA 0.1

%/V

Load Regulation

I

OUT

= 1mA to 1A 0.8 1.5

%/A

Ad j ustab l e O utp ut V ol tag e Range

0.8 5 V

Maximum Output Current I

OUT

Continuous 1

A

RMS

Short-Circuit Current Limit I

LIM

V

OUT

= 0 1.0 1.9 A

In-Regulation Current Limit I

LIM

V

SET

= 0.76V 2.0 4.0 A

SET Dual Mode Threshold 40 80 120 mV

SET Input Bias Current I

SET

V

SET

= +0.9V 50 300 nA

I

OUT

= 100µA 0.5 2.0

Ground Current I

GND

I

OUT

= 1A 2.5

mA

I

OUT

= 1mA, +2.7V < VIN < +5.5V 0.2

Dropout Voltage
(Note 1)

I

OUT

= 1A, V

OUT

= +3.3V (Note 2)

350

mV

Output Voltage Noise f = 10Hz to 1M Hz, C

OU T

= 1µF, I

OU T

= 150mA

µV

RMS

Power-Supply Rejection Ratio

f = 100kHz, C

OUT

= 1µF54dB

Shutdown Supply Current I

OFF

SHDN = GND, VIN = +5.5V, V

OUT

= 0 0.1 10 µA

V

IH

1.6

SHDN Input Threshold

V

IL

+2.7V < V

IN

< +5.5V

0.6

V

SHDN Input Bias Current SHDN = GND or IN 0 0.1 µA

Soft-Start Charge Current I

SS

VSS = 0 6 µA

RST Output Low Voltage I

SINK

= 1mA 0.1 V

IN Operating Voltage Range for
RST Valid

I

SINK

= 10µA 1.0 5.5 V

RST Leakage V

RST

= +5.5V

1µA

RST Trip Level Referred to
Nominal V

OUT

Falling edge, typical hysteresis = 10mV 89 92 95

% OUT

RST Release Delay Rising edge 1 3 5.5 ms

Thermal Shutdown Threshold

Typical thermal hysteresis = +20°C

o

C

Dual Mode is a trademark of Maxim Integrated Products.

∆V

LNR

∆V

LDR

PSRR

T

SHDN

2.35 2.45 2.55

792 800

200

150

0.01

170

MAX8869

1A, MicroCap, Low-Dropout,

Linear Regulator

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS

(VIN= +2.7V or V

OUT(NOM)

+ 0.5V (whichever is greater), SHDN = IN, SS = open, SET = GND, C

OUT

= 1µF, TA= -40°C to +85°C,

unless otherwise noted.) (Note 3)

Note 1: Dropout voltage is (V

IN

- V

OUT

) when V

OUT

falls to 100mV below the value of V

OUT

measured when VIN= V

OUT(NOM)

+0.5V.

Since the minimum input voltage is 2.7V, this specification is only meaningful when V

OUT

≥ 2.7V.

Note 2: The output voltage is externally set using a resistive voltage-divider from OUT to SET.
Note 3: Specifications to -40°C are guaranteed by design, not production tested.

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNITS

Input Voltage Range V

IN

2.7 5.5 V

Input Undervoltage Lockout Typical hysteresis = 50mV 2.3 2.6 V

Output Voltage Accuracy I

OUT

= 1mA, TA = +85°C-11%

SET Regulation Voltage
(Adjustable Mode)

I

OUT

= 150mA, TA = +85°C

808 mV

Load Regulation

I

OUT

= 1mA to 1A 2.0

%/A

Ad j ustab l e O utp ut V ol tag e Rang e 0.8 5 V

Maximum Output Current I

OUT

Continuous 1

A

RMS

Short-Circuit Current Limit I

LIM

V

OUT

= 0 1.0 A

In-Regulation Current Limit I

LIM

V

SET

= +0.76V 2.0 A

SET Dual Mode Threshold 40 120 mV

SET Input Bias Current I

SET

V

SET

= +0.9V 300 nA

Ground Current I

GND

I

OUT

= 100µA 2.0 mA

Dropout Voltage (Note 1) I

OUT

= 1A, V

OUT

= +3.3V (Note 2) 350 mV

Shutdown Supply Current I

OFF

SHDN = GND, VIN = +5.5V, V

OUT

= 0 10 µA

V

IH

1.7

SHDN Input Threshold

V

IL

+2.7V < V

IN

< +5.5V

0.6

V

SHDN Input Bias Current SHDN = GND or IN 0.1 µA
RST Output Low Voltage I

SINK

= 1mA 0.1 V

IN Operating Voltage Range for
RST Valid

I

SINK

= 10µA 1.0 5.5 V

RST Leakage V

RST

= +5.5V 1 µA

RST Trip Level Referred to
Nominal V

OUT

Falling edge, typical hysteresis = 10mV 88 95

% OUT

RST Release Delay Rising edge 1 6 ms

∆V

LDR

792