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LTC3202
Low Noise, High Efficiency
Charge Pump for White LEDs
FEATURES
DESCRIPTIO
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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
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
V IN and V OUT ) make the LTC3202 ideally suited for small,
battery-powered applications.
1.5MHz Switching Frequency
I CC < 1 μ A in Shutdown
Available in 10-Pin MSOP and 3mm × 3mm
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DFN Packages
APPLICATIO S
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
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White LED Backlighting
Programmable Boost Current Source
capacitors. A low current shutdown feature disconnects
the load from V IN and reduces quiescent current to less
than1 μ A.
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
1 μ F
C3
1 μ F
Input and Output Ripple
CURRENT
10
8
C1 +
D0
7
C1 –
9
C2 +
6
C2 –
V OUT
0mA TO 125mA
3 TOTAL CURRENT
V IN
(AC COUPLED)
20mV/DIV
PROGRAMMING
1
D1
LTC3202
V IN
3V TO 4.5V
4
V IN
FB
2
V OUT
(AC COUPLED)
C1
1 μ F
GND
5, 11
C4
1 μ F
36 ?
36 ?
36 ?
36 ?
36 ?
36 ?
20mV/DIV
C1, C2, C3, C4 = MURATA GRM 39X5R105K6.3 OR TAIYO YUDEN JMK107BJ105MA
3202 TA01
V IN = 3.6V
C IN = C OUT = 1 μ F
I OUT = 60mA
500ns/DIV
3202 G09
3202fa
1
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