Si9139 Datasheet, PDF (1/17 Pages) Vishay Siliconix – Multi-Output, Individual On/Off Control Power-Supply Controller

New Product
Si9139
Vishay Siliconix
Multi-Output, Individual On/Off Control Power-Supply Controller
FEATURES
D Five Output 50-W, Triple Output DC-DC-Controller
D Up to 95% Efficiency
D "3% Total Regulation (Line, Load and Temperature)
D 4.5-V to 30-V Input Voltage Range
D Two Fixed 1.5-V, 1.8-V, 2.0-V, 2.2-V, 2.5-V, 2.8-V, 3.3-V Outputs
D One Adjustable 1.24-V to 20-V Output
D 3.3-V Reference Output
D 5-V/30-mA Linear Regulator Output
D Individual ON/OFF Control for A and B Outputs
D 300-kHz Low-Noise Fixed Frequency Operation
D High Efficiency Pulse Skipping Mode Operation at Light Load
D Only Three Inductors RequiredNo Transformer
D LITTLE FOOT^R Optimized Output Drivers
D Internal Under Voltage Lockout and Soft-Start
D Minimum Number of External Control Components
D 28-Pin SSOP Package
D Output Overvoltage Protection
D Output Undervoltage Shutdown
D Power-Good Output (RESET)
APPLICATIONS
D Notebook and Subnotebook Computers
D PDAs and Mobile Communicators
D Portable Display
D Multimedia Set-Top Box
D Telecommunications Infrastructure
D Network Equipment
D Distributed Power Conversion
DESCRIPTION
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_C to
85_C) temperature range.
FUNCTIONAL BLOCK DIAGRAM
V_IN
(4.5 V to 30 V)
V_L
(5.0 V)
V_OUTA
0-6A
5-V
Linear
Regulator
3.3-V
Voltage
Reference
1.5- V - 3.3-V
SMPS_A
1.8- V - 3.3-V
SMPS_B
V_REF
(+3.3 V)
V_OUTB
0-6A
Auxiliary SMPS
Programmable
V_OUTC
1.24-V to 20-V/500 mA
Adjustable
ON_A
ON_B
Document Number: 71841
S-22317—Rev. A, 16-Dec-02
Logic Control Power_Good
RESET
(Power_Good)
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