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SI9145BQ-T1-E3 Fiches technique(PDF) 1 Page - Vishay Siliconix

No de pièce SI9145BQ-T1-E3
Description  Low-Voltage Switchmode Controller
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

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Si9145
Vishay Siliconix
Document Number: 70021
S-40710—Rev. K, 19-Apr-04
www.vishay.com
1
Low-Voltage Switchmode Controller
FEATURES
D 2.7-V to 7-V Input Operating Range
D Voltage-Mode PWM Control
D High-Speed, Source-Sink Output Drive (200 mA)
D Internal Oscillator (up to 2 MHz)
D Standby Mode
D 0−100% Controllable Maximum Duty-Cycle
DESCRIPTION
The Si9145 switchmode controller IC is ideally suited for high
efficiency dc/dc converters in low input voltage systems.
Operation is guaranteed down to 2.7 V, with a minimum
start-up voltage of 3.0 V making the Si9145 ideal for use with
NiCd, NMH, and lithium ion battery packs. A mode select pin
allows the output driver polarity to be programmed allowing the
device to function as a step-up or step-down converter.
Features include a precision bandgap reference, a wide
bandwidth error amplifier, a 2-MHz oscillator, an input voltage
monitor with standby mode and a 200-mA output driver.
Supply current in normal operation is typically 1.1 mA and
250 mA in standby mode.
The Si9145 implements conventional voltage mode control.
The maximum duty cycle in boost mode can be limited by
voltage on DMAX/SS pin. Frequency can be externally
programmed by selection of ROSC and COSC.
The Si9145 is available in both standard and lead (Pb)-free
16-pin SOIC and TSSOP packages and is specified over the
industrial temperature range (−25_C to 85_C).
FUNCTIONAL BLOCK DIAGRAM
+
UVLOSET
DMAX/SS
COMP
COSC
FB
NI
VS
OUTPUT
PGND
GND
VUVLO
Oscillator
OTS
Temp
Sense
VREF
1.5-V Reference
Generator
ROSC
ENABLE
MODE SELECT
VDD
UVLO
Error Amp
S
R
Logic
Control
+
+
Driver
Pentiumt is a trademark of Intel Corporation. PowerPCt is a trademark of IBM.


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