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The Si9139 is current-mode PWM and PSM converter controller, with two high current, high efficiency synchronous buck controllers and an adjustable buck-boost controller whose output can be set between 1.24 V and 20 V with an external resistor divider. Designed for fixed and portable devices, it offers a total of five power outputs (three tightly regulated dc/dc converter outputs, a precision 3.3-V reference and a 5-V LDO output. Individually controlled power-up sequencing, power-good signal with delay, internal frequency compensation networks and automatic boot-strapping simplify the system by minimizing the number of external components while achieving conversion efficiencies approaching 95%.
The Si9139 is available in a 28-pin SSOP package and specified to operate over the extended commercial (-40 to 85) temperature range.
· Five Output 50-W, Triple Output DC-DC-Controller · Up to 95% Efficiency · ±3% Total Regulation (Line, Load and Temperature) · 4.5-V to 30-V Input Voltage Range · Two Fixed 1.5-V, 1.8-V, 2.0-V, 2.2-V, 2.5-V, 2.8-V, 3.3-V Outputs · One Adjustable 1.24-V to 20-V Output · 3.3-V Reference Output · 5-V/30-mA Linear Regulator Output · Individual ON/OFF Control for A and B Outputs · 300-kHz Low-Noise Fixed Frequency Operation · High Efficiency Pulse Skipping Mode Operation at Light Load · Only Three Inductors RequiredNo Transformer · LITTLE FOOT® Optimized Output Drivers · Internal Under Voltage Lockout and Soft-Start · Minimum Number of External Control Components · 28-Pin SSOP Package · Output Overvoltage Protection · Output Undervoltage Shutdown · Power-Good Output(RESET)
SI9139 Typical Application
· Notebook and Subnotebook Computers · PDAs and Mobile Communicators · Portable Display · Multimedia Set-Top Box · Telecommunications Infrastructure · Network Equipment · Distributed Power Conversion