General Description

The MAX5096/MAX5097 easy-to-use, Dual Mode™,

DC-DC converters operate as LDO (low dropout) or

switch-mode buck converters. At a high output load,

the converters operate as high-efficiency pulse-width-

modulated (PWM) switch-mode converters and reduce

the power dissipation. The devices switch to a low-qui-

During the key-off condition, the system’s microcon-

troller drives the LDO/BUCK input on the fly and forces

the MAX5096/MAX5097 into LDO Mode, thereby reduc-

ing the quiescent current significantly.

In Buck Mode, the MAX5096/MAX5097 operate from a 5V

to 40V input voltage range and deliver up to 600mA of

load current with excellent load and line regulation. The

fixed-switching frequency versions of 135kHz and

330kHz are available. The MAX5096/MAX5097 DC-DC

internal oscillator can be synchronized to an external

clock. External compensation and a current-mode control

scheme make it easy to design with.

In LDO Mode, the MAX5096/MAX5097 operate from a

4V to 40V input voltage. The LDO Mode operation is

intended for a lower output load current of up to

100mA. The quiescent current at 100µA load in LDO

Mode is only 41µA (typ).

The MAX5096/MAX5097 feature an enable input that

shuts down the device, reducing the current consump-

tion to 6µA (typ). Additional features include a power-on

reset output with a capacitor-adjustable timeout period,

programmable soft-start, output tracking, output over-

load, short-circuit and thermal shutdown protections.

The MAX5096/MAX5097 operate over the -40°C to

+125°C automotive temperature range and are avail-

able in thermally enhanced 20-pin TSSOP or 16-pin

TQFN packages.

Applications

Automotive

Industrial

Features

♦ High-Efficiency Switcher Mode (Buck Mode) or

Low-Quiescent-Current Linear Regulator

(LDO Mode) Operation

♦ Wide Operating Input Voltage Range

+5V to +40V Buck Mode

+4V to +40V LDO Mode

♦ Fixed 3.3V or 5V and Adjustable (1.24V to 11V)

Output Voltage Versions

♦ 6µA (typ) Shutdown Current

♦ Fixed 135kHz or 330kHz Switching Frequency

♦ External Frequency Synchronization

♦ Programmable Soft-Start

♦ Integrated Microprocessor Reset (RESET) Circuit

with Programmable Timeout Period

♦ Thermal and Short-Circuit Protection

♦ -40°C to +125°C Automotive Temperature Range

♦ Thermally-Enhanced Package Dissipates

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

________________________________________________________________ Maxim Integrated Products

1

19-0603; Rev 0; 7/06

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.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

PKG

CODE

MAX5096AATE+* -40°C to +125°C 16 TQFN-EP**

T1655-2

MAX5096BATE+

-40°C to +125°C 16 TQFN-EP**

T1655-2

MAX5096AAUP+* -40°C to +125°C 20 TSSOP-EP**

U20E-4

MAX5096BAUP+* -40°C to +125°C 20 TSSOP-EP**

U20E-4

MAX5097AATE+ -40°C to +125°C 16 TQFN-EP**

T1655-2

MAX5097BATE+* -40°C to +125°C 16 TQFN-EP**

T1655-2

MAX5097AAUP+* -40°C to +125°C 20 TSSOP-EP**

U20E-4

MAX5097BAUP+* -40°C to +125°C 20 TSSOP-EP**

U20E-4

TQFN

+

16

1

2

3

4

12

11

10

9

15

14

13

56

7

8

EN

OUT

ADJ

LDO/BUCK

SGND

RESET

BP

PGND

MAX5096

MAX5097

TOP VIEW

20

19

18

17

16

15

14

1

2

3

4

5

6

7

LX

LX

N.C.

EN

PGND

IN

IN

IN

TOP VIEW

MAX5096

MAX5097

OUT

ADJ

N.C.

BP

13

8

N.C.

12

9

COMP

SYNC

11

10

CT

SS

SGND

TSSOP

LDO/BUCK

RESET

+

Pin Configurations

*Future product—contact factory for availability.

+Denotes lead-free package.

**EP = Exposed pad.

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