SI9145集成电路（IC）的PMIC-稳压器-DCDC开关式控制器规格书PDF中文资料

SI9145属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由威世科技半导体制造生产的SI9145DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。

FEATURES

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 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 A 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).