Si9176

Voltages Referenced to AGND = 0 V
V_IN, V_DD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 V
Lx, SD, MODE, FB, CREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   --0.3 to 6.2 V
(or to VDD +0.3 V whichever is less)
GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . --0.3 to +0.3 V
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2 kV
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   --65 to 125
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Power Dissipation (Package)a
10-pin MSOPb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .481 mW
10-pin MLP33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 915 mW
Thermal Impedance (JA)
10-Pin MSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135/W
10-Pin MLP33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  71/W
Peak Inductor Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 A
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 7.4 mW/ above 85.
c. Derate 14 mW/ above 85.

The Si9176 is a high efficiency 600-mA step down converter with internal low on resistance power MOSFET switch and synchronous rectifier transistors. It is designed to convert one cell LiIon battery or three cell alkaline battery voltages to a dynamically adjustable dc output. The integrated high frequency error amplifier with internal compensation minimizes external components.

In order to insure efficient conversion throughout the entire load range, PWM (pulse width modulation), PSM (pulse skippingmode) or Automode can be selected. InPWMmode, 2-MHz switching permits use of small external inductor and capacitor sizes allowing one of the smallest solutions. PSMmode provides increased efficiency at light loads. InPSM mode the oscillator frequency is kept above 20 kHz to avoid audio band interference. When operating in Auto mode, the converter automatically selects operating in either PWM or PSM mode according to load current demand.

The Si9176 is available in 10-pin MSOP and even smaller MLP33 packages and is specified to operate over the industrial temperature range of 40 to 85