________________________________________________________________ _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.

Automotive Power-Management IC with

Three Step-Down Converters and Linear Regulator

19-5718; Rev 1; 8/11

General Description

The MAX16920 power-management IC integrates

three high-voltage step-down DC-DC converters, one

high-voltage linear regulator, and an overvoltage

protection block. The three step-down converters deliver

up to 150mA, 600mA, and 1.5A, while the linear regulator

is capable of up to 150mA. The MAX16920 is designed

to operate with input voltages between 5.5V to 28V and

survive voltage transients to 45V, making it ideal for

automotive applications.

The MAX16920 is optimized for high efficiency and

low standby current. The MAX16920A features 400kHz

switching frequency, while the MAX16920B features

2MHz switching frequency. The MAX16920 can be

ordered with spread-spectrum frequency modulation.

The DC-DC converters can also be synchronized to

an external frequency reference using the SYNC input

minimize EMI.

The MAX16920 includes power-good outputs (PG_) for

DC-DC2, DC-DC3, LDOA, and a power-on reset (POR)

for DC-DC1. All regulators other than DC-DC1 have

an enable input (EN_). DC-DC1 always operates when

power is applied to the MAX16920.

The MAX16920 operates over the -40°C to +125°C

temperature range, and is available in a compact,

thermally enhanced 32-pin TQFN package (7mm x 7mm).

Applications

Automotive Radios

Automotive Navigation Systems

Features

S

_ 5.5V_to_28V_Wide_Operating_Voltage_Range

S

_ Tolerates_Input_Voltage_Transients_Up_to_45V

S

_ Three_High-Voltage_Buck_Converters_with_High_

Efficiency

S

_ DC-DC1:_150mA_(max),_Always-On,_Ultra-Low_

Quiescent_Current_(25μA)_

_ 3.3V_Fixed_or_Adjustable_from_1.22V_to_5V

S

_ DC-DC2:_600mA_(max),_5.0V_Fixed_or_Adjustable_

Output_Voltage_from_1.22V_to_5V_

S

_ DC-DC3:_1.5A_(max),_3.3V_Fixed_or_Adjustable_

from_1.22V_to_8.0V

S

_ One_High-Voltage_5V_Linear_Regulator_(150mA)

S

_ pMOS_Driver_Output_with_Fixed_Overvoltage_

Shutdown

S

_ 400kHz_(MAX16920A)_or_2MHz_(MAX16920B)_

Switching_Frequency

S

_ Frequency_Synchronization_Input_

S

_ Open-Drain_Power-Good_Outputs_for_DC-DC2,_

DC-DC3,_LDOA,_and_Power-On_Reset_for_DC-DC1

S

_ Enable_Inputs_for_DC-DC2,_DC-DC3,_and_LDO

S

_ Internal_Soft-Start

S

_ ±2%_Undervoltage_Comparator

S

_ Overtemperature_Shutdown

S

_ -40°C_to_+125°C_Operating_Temperature_Range

S

_ Compact_32-Pin_TQFN_Package_(7mm_x_7mm)

Ordering Information

/V denotes an automotive qualified part.

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

*Future product—contact factory for availability.

**EP = Exposed pad.

†Contact the factory for other POR options.

EVALUATION

_KIT

AVAILABLE

PART

TEMP_RANGE

SWITCHING_

FREQUENCY

POR_DELAY†

(ms)

PIN-PACKAGE

MAX16920AATJ/V+*

-40NC to +125NC

400kHz

5.1

32 TQFN-EP**

MAX16920AATJS/V+*

-40NC to +125NC

400kHz

5.1

32 TQFN-EP**

MAX16920BATJ/V+

-40NC to +125NC

2.2MHz

7.5

32 TQFN-EP**

MAX16920BATJS/V+*

-40NC to +125NC

2MHz

8

32 TQFN-EP**