LM2751 Datasheet, PDF (1/19 Pages) National Semiconductor (TI) – Regulated 2X, 1.5X Switched Capacitor White LED Driver

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 low-
cost ceramic capacitors.
Typical Application Circuit
V_IN = 2.8V - 5.5V
V_OUT = 4.5V, or 5.0V
3 ^VIN
V_{OUT 1}
C_IN
2.2 µF
2 ^C1+
C₁
1 µF
2.2 µF
C_OUT
D₁
D_X
9 _C1-
10 ^C2+
LM2751
EN ₆
C₂
1 µF
CS0 ₄
CS1
7
5
C₂-
GND
8
R
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
V_OUT = 5.0V
V_OUT = 4.5V
80
70
60
V_OUT = 5.0V
50
V_OUT = 4.5V
Typical 2x Only Pump
40
2.7 3.0 3.3 3.6 3.9 4.2
INPUT VOLTAGE (V)
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 of all parameters.
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