LM2758 Datasheet, PDF (1/23 Pages) National Semiconductor (TI) – Switched Capacitor Flash LED Driver in micro SMD

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LM2758
SNVS551E – APRIL 2008 – REVISED MAY 2016
LM2758 Switched Capacitor Flash LED Driver in DSBGA Package
1 Features
•1 Up to 700-mA Output Current
• 90% Peak Efficiency
• Indicator, Torch, and Flash Modes
• Time-Out Circuitry Limits Flash Duration to 814
Milliseconds (Typical)
• Adaptive 1× and 1.5× Gains for Maximum
Efficiency
• True Shutdown
• Internal Soft-Start Eliminates Inrush Current
• Ultra-Small Solution Size
– No Inductor, Only 4 Capacitors and a Resistor
Required
– 2.022 mm × 1.527 mm × 0.6 mm Thin DSBGA
package
2 Applications
• Camera Flash in Mobile Phones
• Flash for Digital Cameras
3 Description
The LM2758 device is an integrated low-noise, high-
current switched capacitor DC-DC converter with a
regulated current sink. The device is capable of
driving loads up to 700 mA from a single-cell Li-Ion
battery. Maximum efficiency is achieved over the
input voltage range by actively selecting the proper
gain based on the LED forward voltage and current
requirements.
One external low-power resistor sets the desired
current for indicator, torch, and flash modes. To
protect the devices and the flash LED, internal time-
out circuitry turns off the LM2758 in case of a faulty
prolonged flash mode. Internal soft-start circuitry
limits the amount of inrush current during start-up.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM2758
DSBGA (12)
2.022 mm × 1.527 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
C1
C2
2.7 V to 5.5 V
+
C_IN
-
C1⁺
VIN
C1^-
C2⁺
LM2758
C2^-
CP_OUT
C_OUT
EN1
EN2 _ISET
R_SET
LED-
PGND SGND
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.