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SSL3250A
Photo flash dual LED driver
Rev. 05 — 16 December 2009
Product data sheet
1. General description
The SSL3250A is a photo flash LED driver designed for battery operated mobile devices
such as mobile phones and PDAs. The boost converter delivers high performance and
drives a single or dual, high brightness LED at up to 500 mA with over 85 % efficiency.
The driver can be programmed to operate in Flash, Torch or Indicator / Video-on mode.
The small silicon size and the high internal switching frequency of 1.2 MHz minimize the
SSL3250A footprint making it very suitable for mobile phones where space is limited, and
only requiring four external components. Driving a high power flash LED within its safe
operating limits was a concern when the SSL3250A was designed, so a time-out function
can be programmed via the I 2 C interface, which will prevent overstressing the LED. Due
to the specific requirements of a mobile phone, the flash current can be rapidly lowered
during RF transmit by using optional external setting resistors.
2. Features
High power single, or dual, LED output driving up to 500 mA flash current
Separate indicator LED output of 2.5 mA to 20 mA
Output voltage of up to 9.5 V
Wide input voltage range of 2.7 V to 5.5 V
High efficiency, over 85 % at optimum output current
Switching frequency of 1.2 MHz
Flash, Torch, and Indicator mode supported
Internally timed flash operation up to 820 ms
I 2 C-bus, programmable up to 400 kHz
Strobe signal to avoid I 2 C latency for flash
Discrete enable signals for stand-alone operation
Optional resistor configurable output currents
Fast response to accommodate external TxMasking functionality
Soft start in Torch and Flash modes to avoid battery overloading
Integrated protection circuits for enhanced system reliability
Internal time-out function
OverTemperature Protection (OTP)
UnderVoltage LockOut (UVLO)
OverVoltage Protection (OVP)
Output current protection
Interrupt signaling to system controller
Low device shut-down current, less than 1 μ A
SOT758-3, thermally enhanced 16 terminal HVQFN package
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