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LT1932
Constant-Current DC/DC
LED Driver in ThinSOT
FEATURES
DESCRIPTIO
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Up to 80% Efficiency
Inherently Matched LED Current
Adjustable Control of LED Current
Drives Five White LEDs from 2V
Drives Six White LEDs from 2.7V
Drives Eight White LEDs from 3V
Disconnects LEDs In Shutdown
1.2MHz Fixed Frequency Switching
Uses Tiny Ceramic Capacitors
Uses Tiny 1mm-Tall Inductors
Regulates Current Even When V IN > V OUT
Operates with V IN as Low as 1V
Low Profile (1mm) ThinSOT TM Package
The LT ? 1932 is a fixed frequency step-up DC/DC converter
designed to operate as a constant-current source. Be-
cause it directly regulates output current, the LT1932 is
ideal for driving light emitting diodes (LEDs) whose light
intensity is proportional to the current passing through
them, not the voltage across their terminals.
With an input voltage range of 1V to 10V, the device works
from a variety of input sources. The LT1932 accurately
regulates LED current even when the input voltage is
higher than the LED voltage, greatly simplifying battery-
powered designs. A single external resistor sets LED
current between 5mA and 40mA, which can then be easily
adjusted using either a DC voltage or a pulse width
Cellular Telephones
APPLICATIO  S
s
modulated (PWM) signal. When the LT1932 is placed in
shutdown, the LEDs are disconnected from the output,
ensuring a quiescent current of under 1 μ A for the entire
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Handheld Computers
Digital Cameras
Portable MP3 Players
Pagers
circuit. The device’s 1.2MHz switching frequency permits
the use of tiny, low profile chip inductors and capacitors to
minimize footprint and cost in space-conscious portable
applications.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Li-Ion Driver for Four White LEDs
Efficiency
V IN
2.7V TO 4.2V
C1
4.7 μ F
6
V IN
L1
6.8 μ H
1
SW
D1
85
80
75
70
V IN = 4.2V
V IN = 2.7V
LT1932
PWM
DIMMING
CONTROL
5
SHDN
R SET
4
R SET
1.50k
LED
GND
2
3
15mA
C2
1 μ F
65
60
55
0
5
10 15
20
C1: TAIYO YUDEN JMK212BJ475
C2: TAIYO YUDEN EMK212BJ105
1932 TA01
LED CURRENT (mA)
1932 TA02
D1:ZETEX ZHCS400
L1: SUMIDA CLQ4D106R8 OR PANASONIC ELJEA6R8
1932f
1
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