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High-Efficiency Step-Up
Current Regulator for LEDs
Pin Description
PIN
1
2
3
4
5, 7
6
8
9
10
NAME
V CC
SHDN
REF
ADJ
GND
FB
PGND
CS
EXT
FUNCTION
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
input and output. The minimum forward voltage of the LED array must exceed the maximum V BATT to ensure
that the LEDs are off in shutdown.
1.25V Reference Output. Capable of sourcing 150μA for external loads. This pin is internally compensated.
Do not connect any bypass capacitors at REF.
Adjust Input. Allows dynamic adjustment of the output current. FB regulates to 300mV when ADJ = REF.
Ground
Feedback Input. Connect to the external LED current-sense feedback resistor.
Power Ground
FET Current-Sense Input
Gate Driver Output
CS
MAX1698
SHDN
UNDERVOLTAGE
V CC
LOCKOUT/
SHUTDOWN
TRIG
V CC
MAX t ON
ADJ
FB
Q
TRIG
MIN t OFF
Q
EXT
PGND
GND
SOFT-START
1.25V
REFERENCE
REF
Figure 1. Functional Diagram
_______________________________________________________________________________________
5
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