MAX16920AATJS/V 데이터 시트보기 (PDF) - Maxim Integrated

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MAX16920AATJS/V

Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator

Maxim Integrated 

MAX16920

Automotive Power-Management IC with

Three Step-Down Converters and Linear Regulator

Pin Description (continued)

PIN

NAME

FUNCTION

13

PGNDB Power Ground for DC-DC1 and DC-DC2

14

LX2

DC-DC2 Converter Switching Node. Connect an LC filter to LX2. Use a capacitor with a maximum

ESR of 0.3Ω.

15

VINB

Battery Supply-Voltage Input. VINB supplies power to DC-DC2 and DC-DC3.

16

BST2

Bootstrap Capacitor Connection for DC-DC2. Connect a 0.1µF capacitor from BST2 to LX2.

17

BST3

Bootstrap Capacitor Connection for DC-DC3. Connect a 0.1µF capacitor from BST3 to LX3.

18

LX3

DC-DC3 Converter Switching Node. Connect an LC filter to LX3. Use a capacitor with a maximum

ESR of 0.3Ω.

19

PGNDA Power Ground for DC-DC3

20

FB3

DC-DC3 Feedback Input. Connect FB3 to GND for a fixed 3.3V output. Connect to a resistive

divider to adjust the output voltage between 1.22V and 8V.

21

OUT3 DC-DC3 Converter Output

Undervoltage Switch. This switch connects the undervoltage resistor-divider to ground during

22

UVS

normal operation. When only DC-DC1 is running, this switch is open to reduce current consumption,

and the undervoltage circuit is not active.

23

UVI

Undervoltage Lockout Sense Input. Connect a resistor-divider between the battery, UVI, and UVS to

set the undervoltage lockout level. The nominal threshold for UVI is 1.205V.

24

EN3

DC-DC3 Converter Enable Input. Drive EN3 high to enable the DC-DC3 converter.

Drive low to disable the DC-DC3 converter.

25

EN2

DC-DC2 Converter Enable Input. Drive EN2 high to enable the DC-DC2 converter.

Drive low to disable the DC-DC2 converter.

26

OT

Active-Low Open-Drain Overtemperature Output. OT output low indicates that all converters except

DC-DC1 are in shutdown due to an overtemperature condition.

27

UVO

Active-Low Open-Drain Undervoltage Output. UVO asserts low when the voltage at UVI falls below

1.205V ±2%. The UVO output is high impedance when only DC-DC1 is operating (standby mode).

DC-DC Converters Synchronization Input. For MAX16920A, the SYNC frequency is divided by 2,

whereas for the MAX16920B the switching frequency is same as the SYNC frequency. Connect

28

SYNC SYNC to GND if SYNC is not used. The SYNC input is a Schmitt trigger type to accommodate a

lowpass-filtered square-wave input. The duty-cycle range of the signal is 30% to 70%. The SYNC

input has an internal 200kΩ pulldown resistor.

29

PG3

DC-DC3 Open-Drain Power-Good Output. PG3 goes low when OUT3 is out of regulation.

In standby mode, PG3 is high-impedance.

30

PG2

DC-DC2 Open-Drain Power-Good Output. PG2 goes low when OUT2 is out of regulation.

In standby mode, PG2 is high-impedance.

31

PGA

Linear Regulator Open-Drain Power-Good Output. PGA goes low when LDO is out of regulation. In

standby mode, PGA is high-impedance.

32

POR

Active-Low Open-Drain Reset Output from DC-DC1. POR is low when DC-DC1 is out of regulation and

has a delay time of 7.5ms to 8ms in the MAX16920B (2MHz) and 5.1ms in the MAX16920A (400kHz).

—

EP

Exposed Pad. Connect the exposed pad to ground.

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