MAX16936 데이터 시트보기 (PDF) - Maxim Integrated

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MAX16936

36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current

Maxim Integrated 

MAX16936

36V, 220kHz to 2.2MHz Step-Down Converter

with 28µA Quiescent Current

OUT

COMP

PGOOD

EN

SUP BIAS

FB

FBSW

FBOK

AON

HVLDO

SWITCH

OVER

EAMP

REF

SOFT

START

PWM

LOGIC

HSD

CS

BIAS

BST

SUPSW

LX

MAX16936

SLOPE

COMP

LSD

OSC

PGND

SYNCOUT

FSYNC FOSC AGND

Figure 1. Internal Block Diagram

Synchronization Input (FSYNC)

FSYNC is a logic-level input useful for operating mode

selection and frequency control. Connecting FSYNC to

BIAS or to an external clock enables fixed-frequency

FPWM operation. Connecting FSYNC to AGND enables

skip mode operation.

The external clock frequency at FSYNC can be higher

or lower than the internal clock by 20%. Ensure the duty

cycle of the external clock used has a minimum pulse

width of 100ns. The device synchronizes to the external

clock within one cycle. When the external clock signal

at FSYNC is absent for more than two clock cycles, the

device reverts back to the internal clock.

Maxim Integrated

System Enable (EN)

An enable control input (EN) activates the device from its

low-power shutdown mode. EN is compatible with inputs

from automotive battery level down to 3.5V. The high

voltage compatibility allows EN to be connected to SUP,

KEY/KL30, or the inhibit pin (INH) of a CAN transceiver.

EN turns on the internal regulator. Once VBIAS is above

the internal lockout threshold, VUVL = 3.15V (typ), the

controller activates and the output voltage ramps up

within 8ms.

A logic-low at EN shuts down the device. During shut-

down, the internal linear regulator and gate drivers turn

off. Shutdown is the lowest power state and reduces the

quiescent current to 5FA (typ). Drive EN high to bring the

device out of shutdown.

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