LM2753 High Power Switched Capacitor Voltage Converter/Flash LED Driver | TI.com

LM2753
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High Power Switched Capacitor Voltage Converter/Flash LED Driver

 

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 (VOUT) over an input supply range of 3 V to 5.5 V. The switched output, IOUT, 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 IOUT and VOUT. 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).

For all available packages, see the orderable addendum at the end of the data sheet.

Features

  • 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

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) LED (#) Iout (Max) (A) Iq (Typ) (mA) Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM2753 Order now 3     5.5     1     0.4     0.060     Enable     -40 to 85     WSON | 10     10WSON: 9 mm2: 3 x 3 (WSON | 10)