SI9135

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 1 Si9135 Vishay Siliconix ABSOLUTE 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. New Product Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. SPECIFICATIONS Test Conditions Parameter 3.3-V Buck Controller Total Regulation (Line, Load, and Temperature) Line Regulation Load Regulation Current Limit Bandwidth Phase Margin VIN = 6 to 30 V, 0 < VCS3 - VFB3 < 90 mV VIN = 6 to 30 V 0 < VCS3 - VFB3 < 90 mV VCS3 - VFB3 L = 10 µH, C = 330 µF RSENSE = 20 mΩ 90 125 50 65 3.23 3.33 3.43 ±0.5 ±0.5 160 V % mV kHz ° VIN = 15 V , IVL = IREF = 0 mA TA = 0°C to 90°C, All Converters ON Limits Mina Typb Maxa Unit 5-V Buck Controller Total Regulation (Line, Load, and Temperature) Line Regulation Load Regulation Current Limit Bandwidth Phase Margin VIN = 6 to 30 V, 0 < VCS5 - VFB5 < 90 mV VIN = 6 to 30 V 0 < VCS5 - VFB5 < 90 mV VCS5 - VFB5 L = 10 µH, C = 330 µF RSENSE = 20 mΩ 90 125 50 65 4.88 5.03 5.18 ±0.5 ±0.5 160 V % mV kHz ° 12-V Flyback Controller Total Regulation (Line, Load, and Temperature) Line Regulation Load Regulation Current Limit Bandwidth Phase Margin VIN = 6 to 30 V, 0 < VCSP - VCSN < 300 mV VIN = 6 to 30 V 0 < VCSP - VFBN < 300 mV VCSP - VCSN L = 10 µH, C = 100 µF RSENSE = 100 mΩ, Ccomp = 120 pF 330 410 10 65 11.4 12.0 12.6 ±0.5 ±0.5 500 V % mV kHz ° Internal Regulator VL Output VL Fault Lockout Voltage VL Fault Lockout Hysteresis VL /FB5 Switchover Voltage VL /FB5 Switchover Hysteresis S-60752—Rev. B, 05-Apr-99 2 4.2 75 All Converters OFF, VIN >5.5 V, 0