FEATURES
• Up to 95 % Efficiency
• 3 % Total Regulation (Each Controller)
• 5.5 V to 30 V Input Voltage Range
• 3.3 V, 5 V, and 12 V Outputs
• 200 kHz Low-Noise Fixed Frequency Operation
• Precision 3.3 V Reference Output
• 30 mA Linear Regulator Output
• High Efficiency Pulse Skipping Mode Operation at
Light Load
• Only Three Inductors Required - No Transformer
• LITTLE FOOT® Optimized Output Drivers
• Internal Soft-Start
• Minimal External Control Components
• 28-Pin SSOP Package
DESCRIPTION
The Si9136 is a current-mode PWM and PSM converter
controller, with two synchronous buck converters (3.3 V and
5 V) and a flyback (non-isolated buck-boost) converter
(12 V). Designed for portable devices, it offers a total five
power outputs (three tightly regulated dc/dc converter
outputs, a precision 3.3 V reference and a 5 V LDO output).
It requires minimum external components and is capable of
achieving conversion efficiencies approaching 95 %.
The Si9136 is available in a 28-pin SSOP package and
specified to operate over the extended commercial (0 °C to
90 °C) temperature range.