MAX1685EEE datasheet(7/16 Pages) MAXIM

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Low-Noise, 14V Input, 1A, PWM

Step-Down Converters

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Pin Description

Typical Operating Characteristics (continued)

(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)

VIN

5V/div

VOUT

100mV/div

2ms/div

LINE-TRANSIENT RESPONSE

MAX1684/85-19

MAX1684, ILOAD = 100mA, VIN = 5V TO 10V,

SYNC/PWM = 3.3V

VSHDN

5V/div

IIN

50mA/div

10ms/div

START-UP CURRENT

MAX1684/85-20

MAX1684, ILOAD = 100mA, VOUT = 3.3V,

VIN = 5V, CILIM/SS = 0.1µF, SYNC/PWM = 3.3V

High-Side MOSFET Gate Bias. Bias voltage for P-channel switch. Bypass to IN with a 0.1µF capacitor.

CVH

FUNCTION

NAME

Analog Supply Voltage Input. Connect to IN with a 0.2 in. metal trace. Bypass to PGND with a 0.1µF

capacitor.

AIN

Logic Supply Voltage Output and IC Logic Supply. Sources 5mA for external loads. Bypass to AGND

with 1µF capacitor.

CVL

Supply Voltage Input

Reference Output. 1.25V reference output supplies 10µA for external loads. Bypass to AGND with 0.1µF

capacitor.

REF

Integrator Capacitor Connection. Connect a 0.01µF capacitor to AGND.

Dual Mode Feedback Input. Connect FB to VOUT for 1.25V output. Connect to an external resistor divider

to adjust the output voltage. Connect to AGND to set output voltage to 3.3V.

Analog Ground

AGND

Current-Limit Adjust/Soft-Start Input. See

Current Limit and Soft-Start section.

ILIM/SS

Bootstrap Input. Connection for the bootstrap switch and internal feedback path. Connect BOOT to VOUT

for VOUT < 5.5V. Connect BOOT to AGND for VOUT > 5.5V.

BOOT

Standby Control Input. Connect to CVL for normal operation. Connect to AGND for low-power mode

(Table 1). This pin overrides SYNC/PWM setting.

STBY

Active-Low Shutdown Input. Connect to ground for shutdown. SHDN can withstand the input voltage.

SHDN

Power Ground

PGND

Inductor Connection. Drain for internal P-channel MOSFETs. Connect inductor from LX to OUT.

13, 14

SYNC/PWM Input:

For synchronized-PWM operation, drive with TTL level, 50% square wave.

Connect to CVL for PWM mode.

Connect to AGND for normal mode.

SYNC/PWM

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