LTC3202
Low Noise, High Efficiency
Charge Pump for White LEDs
FEATURES
s
s
s
s
s
s
s
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DESCRIPTIO
Low Noise Constant Frequency Operation
25% Less Input Current Than Doubler Charge Pump
High Output Current: Up To 125mA
Small Application Circuit
Regulated Output Voltage or Current
Automatic Soft-Start
V
IN
Range: 2.7V to 4.5V
No Inductors
1.5MHz Switching Frequency
I
CC
< 1碌A(chǔ) in Shutdown
Available in 10-Pin MSOP and 3mm
脳
3mm
DFN Packages
The LTC
廬
3202 is a low noise, constant frequency charge
pump DC/DC converter that uses fractional conversion to
increase efficiency in white LED applications. The part can
be used to produce a regulated voltage or current of up to
125mA from a 2.7V to 4.5V input. Low external parts count
(two flying capacitors and two small bypass capacitors at
V
IN
and V
OUT
) make the LTC3202 ideally suited for small,
battery-powered applications.
An internal 2-bit DAC allows LED current to be adjusted for
LED brightness control. The LTC3202 also has thermal
shutdown protection and can survive a continuous short-
circuit from V
OUT
to GND. Built-in soft-start circuitry
prevents excessive inrush current during start-up. High
switching frequency enables the use of small external
capacitors. A low current shutdown feature disconnects
the load from V
IN
and reduces quiescent current to less
than1碌A(chǔ).
The LTC3202 is available in the 10-pin MSOP and 3mm
脳
3mm DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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White LED Backlighting
Programmable Boost Current Source
TYPICAL APPLICATIO
C2
1碌F
C3
1碌F
Programmable White LED Power Supply
Input and Output Ripple
V
IN
(AC COUPLED)
20mV/DIV
8
C1
+
10
CURRENT
PROGRAMMING
V
IN
3V TO 4.5V
C1
1碌F
1
4
D0
D1
V
IN
7
C1
鈥?/div>
9
C2
+
6
C2
鈥?/div>
V
OUT
0mA TO 125mA
TOTAL CURRENT
3
LTC3202
FB
GND
5, 11
2
C4
1碌F
36鈩?/div>
36鈩?/div>
36鈩?/div>
36鈩?/div>
36鈩?/div>
36鈩?/div>
V
OUT
(AC COUPLED)
20mV/DIV
500ns/DIV
V
IN
= 3.6V
C
IN
= C
OUT
= 1碌F
I
OUT
= 60mA
3202 G09
C1, C2, C3, C4 = MURATA GRM 39X5R105K6.3 OR TAIYO YUDEN JMK107BJ105MA
3202 TA01
U
3202fa
U
U
1
LTC3202EDD 產(chǎn)品屬性
LTC3202
121
集成電路 (IC)
PMIC - LED 驅(qū)動(dòng)器
-
-
-
1
是
背光
白色 LED
1.5MHz
2.7 V ~ 4.5 V
-
表面貼裝
10-WFDFN 裸露焊盤
10-DFN（3x3）
管件
-40°C ~ 85°C
LTC3202EDD相關(guān)型號(hào)PDF文件下載
-
型號(hào)
版本
描述
廠商
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