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Si9145

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-CyclePinoutSpecificationsVoltages Referenced to GND.VDD, VS . . . . . . . . . . . . . . ....

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SeekIC No. : 004490907 Detail

Si9145: 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 Ma...

Si9145 Data Sheet

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Part Number:
Si9145
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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




Pinout

Connection Diagram




Specifications

Voltages Referenced to GND.
VDD, VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 V
PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.3 V
VDD to VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V
Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to VDD to +0.3 V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to VDD to +0.3 V
Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65 to 125
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Power Dissipation (Package)a
16-Pin SOIC (Y Suffix)b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mW
16-Pin TSSOP (Q Suffix)c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 925 mW
Thermal ImpedanceJA)
16-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140/W
16-Pin TSSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135C/W
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 7.2 mW/ above 25.
c. Derate 7.4 mW/ above 25.




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 to 85 ).






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