SI9135 Datasheet, PDF (1/14 Pages) Vishay Siliconix – SMBus Multi-Output Power-Supply Controller

Si9135
New Product
Vishay Siliconix
Si9135
SMBus Multi-Output Power-Supply Controller
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/300-kHz Low-Noise Frequency Operation
• Precision 3.3-V Reference Output
• 30 mA Linear Regulator Output
• SMBUS Interface
• High Efficiency Pulse Skipping Mode Operation at Light
Load
• Only Three Inductors Required*No Transformer
• LITTLE FOOT® Optimized Output Drivers
• Internal Soft-Start
• Synchronizable
• Minimal External Control Components
• 28-Pin SSOP Package
DESCRIPTION
The Si9135 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%.
Along with the SMBUS interface, the Si9135 provides
programmable output selection capability.
The Si9135 is available in a 28-pin SSOP package and
specified to operate over the extended commercial (0°C to
90°C) temperature range.
FUNCTIONAL BLOCK DIAGRAM
FaxBack 408-970-5600, request 70817
www.siliconix.com
S-60752—Rev. B, 05-Apr-99
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