White LED Driver
Description
LM2751
www.
ti.
com
SNVS299B – APRIL 2005 – REVISED MAY 2013
LM2751 Regulated 2X, 1.
5X Switched Capacitor White LED Driver
Check for Samples: LM2751
FEATURES
1
•2 Regulated Output Options: 4.
5V, 5.
0V • Output Voltage Regulated Within 3% • Peak Efficiency Over 90% • 150mA (4.
5V) or 80mA (5.
0V) Output Current
Capability • Input Voltage Range: 2.
8V to 5.
5V • Low Input and Output Voltage Ripple • <1µA Typical Shutdown Current • Small Solution Size - NO INDUCTOR • Programmable 725kHz, 300kHz, 37kHz, or
9.
5kHz Switching Frequencies • 10-pin SON No-Pullback Package: 3mm × 3mm
× 0.
8mm
APPLICATIONS
• White LED Display Backlights
• White LED Keypad Backlights
• General Purpose 2×, 1.
5× Regulated Charge Pump
DESCRIPTION
The LM2751 is a constant frequency switched capacitor charge pump with regulated output voltage options of 4.
5V, and 5.
0V.
Over the input voltage range of 2.
8V to 5.
5V the LM2751 provides up to 150mA of output current and requires only four lowcost ceramic capacitors.
Typical Application Circuit
VIN = 2.
8V - 5.
5V
3
CIN 2.
2 µF
2
C1 1 µF
VIN C1+
9 C110 C2+
C2 1 µF 7 C2-
VOUT 1
VOUT = 4.
5V, or 5.
0V
2.
2 µF
LM2751
EN CS0 CS1 GND
6 4 5 8
COUT
D1 R
Capacitors: 1 µF - TDK C1608X7R1A105K 2.
2 µF - TDK C2012X5R1A225K
LM2751 2x/1.
5x Efficiency vs.
2x Charge Pump Efficiency
100 LM2751 2x, 1.
5x Pump
90 VOUT = 5.
0V
VOUT = 4.
5V
EFFICIENCY (%)
80
70
60
50
40 2.
7
VOUT = 5.
0V VOUT = 4.
5V
Typical 2x Only Pump 3.
0 3.
3 3.
6 3.
9
INPUT VOLTAGE (V)
4.
2
DX R
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas Instruments standard warranty.
Production processing does not necessarily include testing o...
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