MAXIM MAX8516, MAX8517, MAX8518 User Manual

General Description

The MAX8516/MAX8517/MAX8518 low-dropout linear
regulators operate from input voltages as low as 1.425V
and are able to deliver up to 1A of continuous output
current with a maximum dropout voltage of only 200mV.
The output voltage can be set from 0.5V to (VIN- 0.2V)
and is 1.4% accurate over load and line variations, from
0°C to +85°C.

These regulators use small, 1µF ceramic input capaci­tors and 4.7µF ceramic output capacitors to deliver 1A
output current. High bandwidth provides excellent tran­sient response and limits the output voltage deviation to
45mV for a 20mA to 1A load step, with only a 4.7µF
ceramic output capacitor, and the voltage deviations can
be reduced further by increasing the output capacitor.

Designed with an internal p-channel MOSFET pass
transistor, the MAX8516/MAX8517/MAX8518 feature
low 340µA (typ) supply current during dropout condi­tions. Soft-start reduces inrush current. Other features
include a logic-controlled shutdown mode, short-circuit
protection, and thermal-overload protection.

The MAX8517 features a power-OK (POK) output that
transitions high when the regulator output is within
±10% of its nominal output voltage. The MAX8518
features a 150ms power-on reset output.

The parts are packaged in a 10-pin µMAX®package that
includes an exposed pad for optimal power dispation.

Applications

Servers
Storage
Networking
Base Stations
Optical Modules

Features

♦ 1.425V to 3.6V Input Voltage Range
♦ Guaranteed 200mV Dropout at 1A Output Current
♦ ±1.4% Output Accuracy Over Load, Line, and

Temperature (0°C to +85°C), ±0.6% Initial Accuracy

♦ Compatible with Ceramic Capacitors
♦ Fast Transient Response
♦ 320µA Operating Supply Current
♦ <25µA Shutdown Supply Current
♦ Short-Circuit Protection
♦ Thermal-Overload Protection
♦ Soft-Start Limits Inrush Current

MAX8516/MAX8517/MAX8518

1.425V to 3.6V Input, 1A,

0.2V Dropout LDO Regulators

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3188; Rev 1; 4/04

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX8516EUB -40°C to +85°C 10 µMAX
MAX8517EUB -40°C to +85°C 10 µMAX
MAX8518EUB -40°C to +85°C 10 µMAX

1
2
3
4
5

10

9
8
7
6

N.C.
OUT
OUT
FBN.C.

IN

IN

EN

MAX8516

µMAX

TOP VIEW

GNDN.C.

1
2
3
4
5

10

9
8
7
6

N.C.
OUT
OUT
FBPOK

IN

IN

EN

MAX8517

µMAX

GNDN.C.

1
2
3
4
5

10

9
8
7
6

N.C.
OUT
OUT
FBN.C.

IN

IN

EN

MAX8518

µMAX

GNDPOR

Pin Configurations

MAX8516
MAX8517
MAX8518

1µF

4.7µF

INPUT

1.425V TO 3.6V

OUTPUT

0.5V TO (V

IN

- 0.2V), 1A

POWER-ON RESET

POWER-OK

ON

OFF

IN_

POR (MAX8518)

POK (MAX8517)

EN GND

FB

OUT_

Typical Operating Circuit

Post Regulators
Notebooks
PDAs
ATE

1

0

µ

M

A

X

3

m

m

x

5

m

m

µMAX is a registered trademark of Maxim Integrated Products, Inc.

MAX8516/MAX8517/MAX8518

1.425V to 3.6V Input, 1A,

0.2V Dropout LDO Regulators

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1. VIN= +1.8V, V

OUT

= +1.5V, EN = IN, I

OUT

= 1mA, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

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, EN, POK (MAX8517), POR (MAX8518),

FB to GND.........................................................-0.3V to +4.0V

OUT to GND..................................................-0.3V to (IN + 0.3V)

Output Short-Circuit Duration.....................................Continuous

Continuous Power Dissipation

(T

A

= +70°C, EP soldered to PC board ground)

10-Pin µMAX (derate 10.3mW/°C above +70°C).........824mW

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 CONDITIONS

UNITS

IN

Input Voltage Range

V

Input Undervoltage Lockout VIN rising, 70mV hysteresis

V

OUT

Output Voltage Range 0.5 3.4 V
Load Regulation I

OUT

= 1mA to 1A 0.1 %/A

Line Regulation VIN = 1.425V to 3.6V, V

OUT

= 1.225V, I

OUT

= 1mA

0

% / V

Dropout Voltage (VIN - V

OUT

)VIN = 1.425V, I

OUT

= 1A, VFB = 480mV

200 mV

Current Limit VIN = 3.6V, V

OUT

= 3V, V

FB

= 480mV 1.6 2 2.4 A

Output Shutdown Leakage VIN = 3.6V, V

OUT

= 0, VEN = 0

25 µA

FB

I

OUT

= 10mA, TA = +85°C

503

FB Threshold Accuracy

V

OUT

= 1.225V to 3V, VIN = V

OUT

+ 0.2V to 3.6V,

I

OUT

= 1mA to 1A

507

mV

FB Input Bias Current VFB = 0.5V, VIN = 3.6V

1µA

GND

VIN = 3.6V, V

OUT

= 3V, I

OUT

= 100mA

GND Supply Current

Dropout, V

IN

= 3.6V, VFB = 480mV

600

µA

GND Shutdown Current VIN = 3.6V, EN = GND

25 µA

POK (MAX8517 ONLY)

FB high

560

POK Threshold

V

FB

moving out of regulation,

V

HYS

= 10mV, IN = 1.425V to 3.6V

FB low

460

mV

POK Output Voltage Low V

FB

= 0.4V or 0.6V, I

POK

= 1mA 25 200 mV

POK Output Current High V

POK

= 3.6V

1µA

POK Fault Delay Time From FB to POK 25 50 100 µs

MIN TYP MAX

1.425 3.600

1.32 1.35 1.38

-0.15
100

0.25

497 500
493

540 550
440 450

0.001

320
340

0.25

0.001

+0.15

MAX8516/MAX8517/MAX8518

1.425V to 3.6V Input, 1A,

0.2V Dropout LDO Regulators

_______________________________________________________________________________________ 3

Note 1: Specifications to -40°C are guaranteed by design, not production tested.
Note 2: Measurements at high current are pulse tested, such that the junction temperature is ambient temperature. Minimum supply

voltage for output accuracy must be at least 1.425V.

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1. VIN= +1.8V, V

OUT

= +1.5V, EN = IN, I

OUT

= 1mA, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER CONDITIONS

UNITS

POR (MAX8518 ONLY)

POR Reset Threshold VFB falling, V

HYS

= 10mV, VIN = 1.425V to 3.6V

460 mV

POR Output Voltage Low V

FB

= 0.4V or 0.6V, I

POR

= 1mA 25 200 mV

POR Output Current High V

POR

= 3.6V

1µA

POR Rising Delay Time From FB to POR

210 ms

EN

EN rising 1.2

Enable Input Threshold VIN = 1.425V to 3.6V

EN falling 0.4

V

Enable Input Bias Current VEN = 0 or 3.6V -1 +1 µA

THERMAL SHUTDOWN

TJ rising

Thermal-Shutdown Threshold Output on or off

T

J

falling

°C

OUTPUT TRANSIENT

Load Transient I

OUT

= 20mA to 1A to 20mA, t

RISE

= t

FALL

= 1µs 3 %

Line Transient δV

IN

= 0.5V, t

RISE

= t

FALL

= 5µs 3 %

Typical Operating Characteristics

(Circuit of Figure 1, V

IN

= +1.8V, V

OUT

= +1.5V, I

OUT

= 1A, C

OUT

= 4.7µF, CIN= 1µF, TA= +25°C.)

OUTPUT VOLTAGE

vs. INPUT VOLTAGE

MAX8516/17/18 toc01

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

3.02.41.81.20.6

1.35

1.40

1.45

1.50

1.55

1.60

1.30

03.6

TA = -40°C TO +85°C

OUTPUT VOLTAGE

vs. LOAD CURRENT

MAX8516/17/18 toc02

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

800600400200

1.492

1.494

1.496

1.498

1.500

1.502

1.490
0 1000 1200

TA = +85°C

TA = +25°C

TA = -40°C

GROUND CURRENT

vs. INPUT VOLTAGE

MAX8516/17/18 toc03

INPUT VOLTAGE (V)

GROUND CURRENT (µA)

3.02.40.6 1.2 1.8

100

200

300

400

500

0

03.6

I

LOAD

= 1A

I

LOAD

= 0.5A

I

LOAD

= 0A

MIN TYP MAX

440 450

0.001

105 150

+165
+150