Camera Phone LED Flash
The LM3642 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing Flash current up to 1.5 A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.
The LM3642 is controlled via an I2C-compatible interface. Features include a hardware flash enable (STROBE) allowing a logic input to trigger the flash pulse as well as a TX input which forces the flash pulse into a low-current Torch Mode, allowing for synchronization to RF power amplifier events or other high-current conditions.
The 4-MHz switching frequency, overvoltage protection and adjustable current limit settings allow the use of tiny, low-profile inductors and (10-µF) ceramic capacitors. The device is available in a small 9-bump DSBGA package and operates over the −40°C to 85°C temperature range.
PART NUMBER | PACKAGE | BODY SIZE (MAX) |
---|---|---|
LM3642 | DSBGA (9) | 1.69 mm × 1.64 mm |
Changes from G Revision (December 2014) to H Revision
Changes from F Revision (December 2013) to G Revision
Changes from E Revision (May 2013) to F Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
A1 | OUT | Power | Step-up DC-DC converter output. Connect a 10-µF ceramic capacitor between this pin and GND. |
A2 | SW | Power | Drain connection for internal NMOS and synchronous PMOS switches. |
A3 | GND | Ground | Ground |
B1 | LED | Output | High-side current source output for Flash LED. |
B2 | STROBE | Input | Active high hardware Flash enable. Drive STROBE high to turn on Flash pulse. Has an internal pulldown resistor of 300 kΩ between STROBE and GND. |
B3 | IN | Power | Input voltage connection. Connect IN to the input supply, and bypass to GND with a 10-µF or larger ceramic capacitor. |
C1 | TX/TORCH | Input | Configurable power amplifier synchronization input or configurable active high Torch enable. Has an internal pulldown resistor of 300 kΩ between TX and GND. |
C2 | SDA | Input/Output | Serial data input/output. |
C3 | SCL | Input | Serial clock input. |