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LTC3202 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 LTC3202
部品説明 Low Noise/ High Efficiency Charge Pump for White LEDs
メーカ Linear Technology
ロゴ Linear Technology ロゴ 

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LTC3202 Datasheet, LTC3202 PDF,ピン配置, 機能
LTC3202
Low Noise, High Efficiency
Charge Pump for White LEDs
FEATURES
s Low Noise Constant Frequency Operation
s 25% Less Input Current Than Doubler Charge Pump
s High Output Current: Up To 125mA
s Small Application Circuit
s Regulated Output Voltage or Current
s Automatic Soft-Start
s VIN Range: 2.7V to 4.5V
s No Inductors
s 1.5MHz Switching Frequency
s ICC < 1µA in Shutdown
s Available in 10-Pin MSOP and 3mm × 3mm
DFN Packages U
APPLICATIO S
s White LED Backlighting
s Programmable Boost Current Source
DESCRIPTIO
The LTC®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
VIN and VOUT) 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 VOUT 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 VIN and reduces quiescent current to less
than1µA.
The LTC3202 is available in the 10-pin MSOP and 3mm ×
3mm DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Programmable White LED Power Supply
C2 C3
1µF 1µF
8 79 6
C1+
10 D0
CURRENT
C1
C2+
C2
0mA TO 125mA
3 TOTAL CURRENT
VOUT
PROGRAMMING 1 D1 LTC3202
VIN
3V TO 4.5V
C1
1µF
4 VIN
2
FB
GND
5, 11
C4
1µF
36
36
36
36
3636
C1, C2, C3, C4 = MURATA GRM 39X5R105K6.3 OR TAIYO YUDEN JMK107BJ105MA
3202 TA01
Input and Output Ripple
VIN
(AC COUPLED)
20mV/DIV
VOUT
(AC COUPLED)
20mV/DIV
VIN = 3.6V
500ns/DIV
CIN = COUT = 1µF
IOUT = 60mA
3202 G09
3202fa
1

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