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MAX1698AEUB

High-Efficiency Step-Up Current Regulator for LEDs

Maxim Integrated 

High-Efficiency Step-Up

Current Regulator for LEDs

Pin Description

PIN NAME

FUNCTION

1

VCC

IC Supply Voltage Input. Power for internal circuitry. Input range is 2.7V to 5.5V.

Active-Low Shutdown Input. In shutdown, the MOSFET turns off, but a current path still exists between the

2

SHDN input and output. The minimum forward voltage of the LED array must exceed the maximum VBATT to ensure

that the LEDs are off in shutdown.

3

REF

1.25V Reference Output. Capable of sourcing 150µA for external loads. This pin is internally compensated.

Do not connect any bypass capacitors at REF.

4

ADJ

Adjust Input. Allows dynamic adjustment of the output current. FB regulates to 300mV when ADJ = REF.

5, 7

GND Ground

6

FB

Feedback Input. Connect to the external LED current-sense feedback resistor.

8

PGND Power Ground

9

CS

FET Current-Sense Input

10

EXT

Gate Driver Output

SHDN

VCC

ADJ

MAX1698

UNDERVOLTAGE

LOCKOUT/

SHUTDOWN

FB

GND

TRIG

MAX tON

Q

TRIG

MIN tOFF

Q

SOFT-START

CS

VCC

EXT

PGND

1.25V

REFERENCE

REF

Figure 1. Functional Diagram

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