SI9135_11 Datasheet, PDF (1/16 Pages) Vishay Siliconix – SMBus Multi-Output Power-Supply Controller

Not recommended for new designs, please refer to Si9138
Si9135
Vishay Siliconix
SMBus Multi-Output Power-Supply Controller
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 both standard and lead (Pb)-free
28-pin SSOP packages and specified to operate over the
extended commercial (0 °C to 90 °C) temperature range.
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
FUNCTIONAL BLOCK DIAGRAM
V_IN
V_L
(5.0 V)
+ 3.3 V
SMBUS Clock Line
SMBUS Data Line
5-V
Linear
Regulator
3.3 - V
Voltage
Reference
3.3-V
SMPS
5-V
SMPS
12-V SMPS
On/Off Control
V_REF
(+ 3.3 V)
+5V
+ 12 V
Document Number: 70817
www.vishay.com
S11-0975-Rev. D, 16-May-11
1
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000