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LM2759SD/NOPB bảng dữ liệu(PDF) 9 Page - Texas Instruments

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LM2759
www.ti.com
SNVS577D – JUNE 2008 – REVISED MAY 2013
APPLICATION INFORMATION
CIRCUIT DESCRIPTION
The LM2759 is an adaptive CMOS charge pump with gains of 1x, 1.5x, and 2x, optimized for driving Flash LEDs
in camera phones and other portable applications. It provides a constant current of up to 1A (typ.) for Flash mode
and 180 mA (typ.) for Torch mode.
The LM2759 has selectable modes including Flash, Torch, Indicator and Shutdown. Flash mode for the LM2759
can also be enabled via the Strobe input pin. The LED is driven from VOUT and connected to the current sink.
The LED drive current and operating modes are programmed via an I2C compatible interface. The LM2759
adaptively selects the next highest gain mode when needed to maintain the programmed LED current level.
To prevent a high battery load condition during a simultaneous RF PA transmission and Flash event, LM2759
has a Flash interrupt pin (TX) to reduce the LED current to the programmed Torch current level for the duration
of the RF PA transmission pulse.
CHARGE PUMP AND GAIN TRANSITIONS
The input to the 1x, 1.5x, 2x charge pump is connected to the VIN pin, and the loosely regulated output of the
charge pump is connected to the VOUT pin. In 1x mode, as long as the input voltage is less than 4.7V (typ.), the
output voltage is approximately equal to the input voltage. When the input voltage is over 4.7V (typ.) the output
voltage is regulated to 4.7V (typ.). In 1.5x mode, the output voltage is regulated to 4.7V (typ.) over entire input
voltage range. For the gain of 2x, the output voltage is regulated to 5.1V (typ.). When under load, the voltage at
VOUT can be less than the target regulation voltage while the charge pump is still in closed loop operation. This is
due to the load regulation topology of the LM2759.
The charge pump’s gain is selected according to the headroom voltage across the current sink of LM2759. When
the headroom voltage VGDX (at the LED cathode) drops below 350 mV (typ.) the charge pump gain transitions to
the next available higher gain mode. Once the charge pump transitions to a higher gain, it will remain at that gain
for as long as the device remains enabled. Shutting down and then re-enabling the device resets the gain mode
to the minimum gain required to maintain the load.
SOFT START
The LM2759 contains internal soft-start circuitry to limit inrush currents when the part is enabled. Soft start is
implemented internally with a controlled turn-on of the internal voltage reference.
CURRENT LIMIT PROTECTION
The LM2759 charge pump contains current limit protection circuitry that protects the device during VOUT fault
conditions where excessive current is drawn. Output current is limited to 1.4A typically.
LOGIC CONTROL PINS
LM2759 has two asynchronous logic pins, Strobe and TX. These logic inputs function according to the table
below:
TX
STROBE
FUNCTION
0
0
Current I2C programmed state (Off, Torch,
Flash, Indicator)
1
0
Current I2C programmed state (Off, Torch,
Flash, Indicator). If Flash is enabled via I2C
and TX is logic High, the LED current will be
at the programmed Torch level.
0
1
Flash Mode (Total LED "ON" Duration limited
by Flash Timeout)
1
1
Torch Mode (Total LED "ON" Duration limited
by Flash Timeout)
Copyright © 2008–2013, Texas Instruments Incorporated
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