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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.
SI9135 Maximum Ratings
VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . -0.3 to +36 V PGND to GND. . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . ±2 V VL to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.5 V BST3, BST5, BSTFY to GND . . . . . . . . . ... . . . . . . .. . . -0.3 V to +36 V VL Short to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous LX3 to BST3; LX5 to BST5; LXFY to BST . . . . . . . . . . . -6.5 V to 0.3 V Inputs/Outputs to GND (SYNC, CS3, CS5, CSP, CSN) . . . . . . . . . . .. . . . -0.3 V to (VL +0.3 V) SDA, SCL . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . -0.3 V to +5.5 V DL3, DL5, DLFY to PGND . . . . . . . . . . . . . . .. . . -0.3 V to (VL +0.3 V) DH3 to LX3, DH5 to LX5, DHFY to LXFY . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to (BSTX +0.3 V) Continuous Power Dissipation (TA = 90°C)a 28-Pin SSOPb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 572 mW Operating Temperature Range. . . . . . . . . . . . . . . . . . . . 0°C to 90°C Storage Temperature Range . . . . . . . . . . . . . . . . . .. -40°C to 125°C Lead Temperature (Soldering, 10 Sec.) . . . . . . . . . . . . . . . . . 300°C Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 9.52 mW/°C above 90°C.
SI9135 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