LTC1702A

` Pin Compatible with the LTC1702 with Improved Current Limit Control
` Two Sides Run Out-of-Phase to Minimize C_IN
` No External Current Sense Resistors
` Excellent Output Regulation: 1% Total Output Accuracy
` Two Independent Controllers in One Package
` All N-Channel External MOSFET Architecture
` 550kHz Switching Frequency Minimizes External Component Size
` 1A to 25A Output Current per Channel
` High Efficiency over Wide Load Current Range
` Less Than 100A Shutdown Current
` Small 24-Pin Narrow SSOP Package

· Microprocessor, DSP Core and I/O Supplies
· Multiple Logic Supply Generator
· Distributed Power Applications
· High Efficiency Power Conversion

Supply Voltage
   V_CC........................................................................ 7V
   BOOSTn............................................................... 15V
   BOOSTn SWn .................................................... 7V
Input Voltage
   SWn ......................................................... 1V to 8V
   All Other Inputs ........................ 0.3V to V_CC + 0.3V
Peak Output Current < 10s
   TGn, BGn ............................................................... 5A
Operating Temperature Range
   LTC1702AC .......................................... 0°C to 70°C
   LTC1702AI ...................................... 40°C to 85°C
Storage Temperature Range ........... 65°C to 150°C
Lead Temperature (Soldering, 10 sec)............... 300°C

The LTC^®1702A is a dual switching regulator controller optimized for high efficiency with low input voltages. It includes two complete, on-chip, independent switching regulator controllers each designed to drive a pair of external Nchannel MOSFETs in a voltage mode feedback, synchronous buck configuration. The LTC1702A uses a constant-frequency, true PWM design switching at 550kHz, minimizing external component size and cost and maximizing load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to Burst Mode^® operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents.

The LTC1702A features an onboard reference trimmed to 0.5% and can provide better than 1% regulation at the converter outputs. Open-drain logic outputs indicate whether either output has risen to within 5% of the final output voltage and an optional latching FAULT mode protects the load if the output rises 15% above the intended voltage. Each channel can be enabled independently; with both channels disabled, the LTC1702A shuts down and supply current drops below 100A.