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SI9145BQ-T1-SI9145BQ-T1-E3
Low-Voltage Switchmode Controller
Si9145
Vishay Siliconix
Low-Voltage Switchmode ControllerFEATURES 2.7-V to 7-V Input Operating Range Voltage-Mode PWM Control High-Speed, Source-Sink Output Drive (200 mA) Internal Oscillator (up to 2 MHz) Standby Mode 0−100% Controllable Maximum Duty-Cycle
DESCRIPTION
The Si9145 switchmode controller IC is ideally suited for highefficiency dc/dc converters in low input voltage systems.
Operation is guaranteed down to 2.7 V, with a minimumstart-up voltage of 3.0 V making the Si9145 ideal for use withNiCd, NMH, and lithium ion battery packs. A mode select pin
allows the output driver polarity to be programmed allowing thedevice to function as a step-up or step-down converter.
Features include a precision bandgap reference, a widebandwidth 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 and250 �A in standby mode.
The Si9145 implements conventional voltage mode control.
The maximum duty cycle in boost mode can be limited byvoltage 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)-free16-pin SOIC and TSSOP packages and is specified over the
industrial temperature range (−25�C to 85�C).
UVLOSET
DMAX/SS
COMP
COSC
OUTPUT
PGND
GND
VUVLO
OTS
VREF
ROSC
ENABLE
MODE SELECT
VDD
