LT1932ES6#TRPBF Linear Technology, LT1932ES6#TRPBF Datasheet

IC LED DRIVR WHITE BCKLGT TSOT-6

LT1932ES6#TRPBF

Manufacturer Part Number
LT1932ES6#TRPBF
Description
IC LED DRIVR WHITE BCKLGT TSOT-6
Manufacturer
Linear Technology
Type
Backlight, White LEDr
Datasheet

Specifications of LT1932ES6#TRPBF

Constant Current
Yes
Topology
PWM, Step-Up (Boost)
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
White LED
Frequency
800kHz ~ 1.6MHz
Voltage - Supply
1 V ~ 10 V
Voltage - Output
36V
Mounting Type
Surface Mount
Package / Case
TSOT-23-6, TSOT-6
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
40mA
Internal Switch(s)
Yes
Efficiency
80%
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LT1932ES6#TRPBFLT1932ES6
Manufacturer:
LINEAR
Quantity:
5 321
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Part Number:
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Quantity:
20 000
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LT1932ES6#TRPBFLT1932ES6#PBF
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Part Number:
LT1932ES6#TRPBFLT1932ES6#TR
Manufacturer:
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Company:
Part Number:
LT1932ES6#TRPBFLT1932ES6#TRMPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
2.7V TO 4.2V
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
Operates with V
Low Profile (1mm) ThinSOT
Cellular Telephones
Handheld Computers
Digital Cameras
Portable MP3 Players
Pagers
V
IN
C1: TAIYO YUDEN JMK212BJ475
C2: TAIYO YUDEN EMK212BJ105
D1:ZETEX ZHCS400
L1: SUMIDA CLQ4D106R8 OR PANASONIC ELJEA6R8
Li-Ion Driver for Four White LEDs
CONTROL
DIMMING
C1
4.7 F
PWM
IN
U
as Low as 1V
5
SHDN
R
V
SET
IN
6
4
R
1.50k
6.8 H
LT1932
SET
L1
TM
Package
GND
U
SW
LED
IN
1
2
> V
D1
3
OUT
15mA
1932 TA01
C2
1 F
DESCRIPTIO
The LT
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 A for the entire
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.
ThinSOT is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1932 is a fixed frequency step-up DC/DC converter
Constant-Current DC/DC
85
80
75
70
65
60
55
0
LED Driver in ThinSOT
U
5
LED CURRENT (mA)
Efficiency
10
V
V
IN
IN
= 2.7V
= 4.2V
15
1932 TA02
20
LT1932
1
1932f

Related parts for LT1932ES6#TRPBF

LT1932ES6#TRPBF Summary of contents

Page 1

... A for the entire 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 ...

Page 2

LT1932 ABSOLUTE AXI U RATI GS (Note 1) V Voltage ............................................................. 10V IN SHDN Voltage ......................................................... 10V SW Voltage ............................................................. 36V LED Voltage ............................................................. 36V R Voltage ............................................................. 1V SET Junction Temperature .......................................... 125 C Operating Temperature ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS Switch Saturation Voltage (V CESAT 400 350 T = 125 C J 300 250 200 T = – 150 100 100 200 400 ...

Page 4

LT1932 CTIO S SW (Pin 1): Switch Pin. This is the collector of the internal NPN power switch. Minimize the metal trace area con- nected to this pin to minimize EMI. GND (Pin 2): Ground ...

Page 5

U U APPLICATIO S I FOR ATIO Inductor Selection Several inductors that work well with the LT1932 are listed in Table 1. Many different sizes and shapes are available. Consult each manufacturer for more detailed information and for their entire ...

Page 6

LT1932 U U APPLICATIO S I FOR ATIO Capacitor Selection Low ESR (equivalent series resistance) capacitors should be used at the output to minimize the output ripple voltage. Because they have an extremely low ESR and are available in very ...

Page 7

U U APPLICATIO S I FOR ATIO Open-Circuit Protection For applications where the string of LEDs can be discon- nected or could potentially become an open circuit, a zener diode can be added across the LEDs to protect the LT1932 ...

Page 8

... Figure 8 shows that without soft-start the input current reaches almost 600mA. Figure 9 shows that when the soft-start circuit is added, the input current has only a brief 300mA spike, and on average does not exceed 100mA. Burst Mode is a registered trademark of Linear Technology Corporation. LT1932 R SET 4 ...

Page 9

U U APPLICATIO S I FOR ATIO OUT 5V/DIV I IN 200mA/DIV 100 s/DIV Figure 8. Input Current at Start-Up Without Soft-Start Board Layout Considerations As with all switching regulators, careful attention must be paid ...

Page 10

LT1932 U TYPICAL APPLICATIO S Single Cell Driver for One White LED LT1932 5 C1 SHDN LED 4 GND SET 4 2 2.5V PWM 24.9k ...

Page 11

U TYPICAL APPLICATIO S 2-Cell Driver for Two White LEDs LT1932 5 C1 SHDN LED 4 GND SET 4 2 2.5V DC 60.4k DIMMING CONTROL ...

Page 12

LT1932 U TYPICAL APPLICATIO S 2-Cell Driver for Four White LEDs LT1932 PWM 5 SHDN LED DIMMING CONTROL R GND SET ...

Page 13

U TYPICAL APPLICATIO S Li-Ion Driver for Two White LEDs L1 6 2. LT1932 5 C1 SHDN LED 4 GND SET 4 3.3V PWM 31.6k DIMMING CONTROL R SET ...

Page 14

LT1932 U TYPICAL APPLICATIO S Li-Ion Driver for Four White LEDs L1 6 2. LT1932 PWM 5 SHDN LED DIMMING CONTROL R GND SET 4 R SET 1.50k ...

Page 15

... SC-74A (EIAJ) FOR ORIGINAL JEDEL MO-193 FOR THIN 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. D1 ...

Page 16

... Output with Up to 100mA Output 100mA, Integrated LP Filter, MSOP8 125mA, Integrated 2-Bit DAC www.linear.com Efficiency 4. 2. TOTAL LED CURRENT (mA) 1932 TA16b Efficiency 4. 2. LED CURRENT (mA) 1932 TA12b Noise 80mA Output RMS LT/TP 1201 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2001 1932f ...

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