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LT1932ES6 Datasheet

  • LT1932ES6

  • Constant-Current DC/DC LED Driver in ThinSOT

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Final Electrical Specifications
LT1932
Constant-Current DC/DC
LED Driver in ThinSOT
July 2001
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Up to 80% Efficiency
Inherently Matched LED Current
Drives Five White LEDs from 2V
Drives Six White LEDs from 2.7V
Drives Eight White LEDs from 3V
Precise, Adjustable Control of LED Current
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
廬
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
modulated (PWM) signal. When the LT1932 is placed in
shutdown, the LEDs are disconnected from the output,
ensuring a quiescent current of under 1碌A for the entire
circuit. The device鈥檚 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.
APPLICATIO S
s
s
s
s
s
Cellular Telephones
Handheld Computers
Digital Cameras
Portable MP3 Players
Pagers
TYPICAL APPLICATIO
L1
6.8碌H
Li-Ion Driver for Four White LEDs
D1
85
80
75
70
65
60
55
0
1932 TA01
V
IN
2.7V TO 4.2V
C1
4.7碌F
6
V
IN
LT1932
5
1
SW
3
15mA
PWM
DIMMING
CONTROL
SHDN
R
SET
4
R
SET
1.50k
LED
GND
2
C2
1碌F
EFFICIENCY (%)
C1: TAIYO YUDEN JMK212BJ475
C2: TAIYO YUDEN EMK212BJ105
D1:ZETEX ZHCS400
L1: SUMIDA CLQ4D106R8 OR PANASONIC ELJEA6R8
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
Efficiency
V
IN
= 4.2V
V
IN
= 2.7V
5
10
15
LED CURRENT (mA)
20
1932 TA02
U
U
1

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