________________________________________________________________ _Maxim Integrated Products_ _ 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

High-Voltage, 2.2MHz, 2A Automotive Step-

Down Converter with Low Operating Current

General Description

The MAX16974 is a 2A, current-mode, step-down con-

verter with an integrated high-side switch. It is designed

to operate with 3.5V to 28V input voltages, while using

only 35FA quiescent current at no load. The switching

frequency is adjustable from 220kHz to 2.2MHz by an

external resistor and can be synchronized to an external

clock. The output voltage is pin selectable to be 5V fixed

or 1V to 10V adjustable. The wide input voltage range

makes the device ideal for automotive and industrial

applications.

The device operates in skip mode for reduced current

consumption in light-load applications. An adjustable

reset threshold helps keep microcontrollers alive down to

their lowest specified input voltage. Protection features

include cycle-by-cycle current limit, overvoltage, and

thermal shutdown with automatic recovery. The device

also features a power-good monitor to ease power-

supply sequencing.

The device operates over the -40°C to +125°C auto-

motive temperature range and is available in a 16-pin

TSSOP-EP package.

Applications

Automotive

Industrial

Features

S

Wide_3.5V_to_28V_Input_Voltage_Range

S

42V_Input_Transient_Tolerance

S

5V_Fixed_or_1V_to_10V_Adjustable_Output_Voltage

S

Integrated_2A_Internal_High-Side_Switch

S

Adjustable_Switching_Frequency_(220kHz_to_

2.2MHz)

S

Operates_Through_Cold_Crank_with_High_Duty_

Cycle

S

Frequency_Synchronization_Input

S

Internal_Boost_Diode

S

35µA_Skip-Mode_Operating_Current

S

5µA_Typical_Shutdown_Current

S

Adjustable_Power-Good_Output_Level_and_Timing

S

3.3V_Logic_Level_to_42V_Compatible_Enable_Input

S

Current-Limit,_Thermal-Shutdown,_and_

Overvoltage_Protections

S

Automotive_Temperature_Range:_-40°C_to_+125°C

S

AEC-Q100_Qualified

19-5630; Rev 1; 7/11

Typical Application Circuit

Ordering Information

/V Denotes an automotive qualified part.

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

EVALUATION

_KIT

AVAILABLE

PART

TEMP_RANGE

PIN-PACKAGE

MAX16974AUE/V+

-40NC to +125NC

16 TSSOP-EP*

MAX16974

D1

22µF

4.7µF

47µF

100pF

20kI

10kI

12.1kI

L1

4.7µH

5V AT 2A

0.1µF

LX

BST

OUT

FB

RESETI

RES

FOSC

CRES

1µF

OPEN

BIAS

5600pF

COMP

FSYNC

EN

SUPSW

SUP

0.1µF

0.1µF

4.7µF

GND