LM2753 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – High Power Switched Capacitor Voltage Convertor/Flash LED Driver

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LM2753
SNVS353E – FEBRUARY 2005 – REVISED JULY 2016
LM2753 High-Power Switched-Capacitor Voltage Converter and Flash LED Driver
1 Features
•1 Input Voltage Range: 3 V to 5.5 V
• Regulated 5-V Output
• 250-mA Output Current With a 3.6-V Input
• 400-mA Pulsed Output Current
(up to 500-ms Duration)
• 60-µA (Typical) Quiescent Current
• Pulse-Frequency Modulation (PFM) Regulation
• Inductor-Less Solution: Requires Only Three
Small Capacitors
• < 1 µA Typical Shutdown Current
• 10-pin WSON Package (No Pullback):
– 3 mm × 3 mm × 0.8 mm
2 Applications
• Cell-Phone Camera Flash
• General Purpose Regulated Voltage Output, High
Current Supply
3 Description
The LM2753 is capable of driving a flash LED with a
pulsed current of 400 mA at an input voltage of 3.6 V.
A switched capacitor doubler, the LM2753 provides a
regulated 5-V output (V_OUT) over an input supply
range of 3 V to 5.5 V. The switched output, I_OUT,
takes less than 10 ns to turn on and provide
maximum current to a flash LED. Flash LED current
is set via a ballast resistor. Continuous illumination
current (torch mode) is programmed by connecting a
resistor between I_OUT and V_OUT. This device uses
only three small, low-cost ceramic capacitors.
The LM2753 device uses pulse frequency modulation
(PFM) regulation. Typical operating frequency is
725 kHz. Under no-load conditions, the LM2753
operates on only 60 µA. If the output is connected to
ground, the charge pump stays in the gain of 1, which
helps limit the input current to 300 mA (typical).
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2753
WSON (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
V_IN = 3 V - 5.5 V
C_IN
C₁
TORCH
FLASH
(Need TORCH
³21´ WR )/$6+)
VIN
2
1 ^C1+
VOUT
V_OUT = 5 V
9
R_TORCH
C_OUT
3 ^C1-
6 ^EN
LM2753
4 ^FLASH
IOUT _{8 RFLASH}
10
GND ₇
5
Flash
LED
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.