LTC3620EDC-1 데이터 시트보기 (PDF) - Linear Technology

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LTC3620EDC-1

Ultralow Power 15mA Synchronous Step-Down Switching Regulator

Linear Technology 

LTC3620

PIN FUNCTIONS

SW (Pin 1): Switch Node Connection to Inductor. This pin

connects to the internal power MOSFET Switches.

GND (Pin 2): Ground Connection for Internal Circuitry and

Power Path Return. Tie directly to local ground plane.

FMIN/MODE (Pin 3): Frequency Clamp Select Input. Driv-

ing this pin with a 20kHz to 300kHz external clock sets the

minimum switching frequency. Pulling this pin low sets

the minimum switching frequency to the internally set

50kHz. Pulling this pin high defeats the minimum switching

frequency and allows the part to switch at arbitrarily low

frequencies dependent on the load current.

LOBATB (Pin 4): Low-Battery Status Output. This open-

drain output pulls low when VIN falls below 3V.

NC (Pin 5): No Connect.

VFB (Pin 6): Regulator Feedback Pin. This pin receives

the feedback voltage from the resistive divider across the

output. For the LTC3620-1, this pin must be connected

directly to VOUT. VOUT is internally divided from VOUT to the

reference voltage of 0.6V as seen in the Block Diagram.

RUN (Pin 7): Regulator Enable Pin. Apply a voltage greater

than 0.8V to enable the regulator. Do not float this pin.

VIN (Pin 8): Input Supply Pin. Must be locally bypassed.

GND (Exposed Pad Pin 9): Ground. Must be soldered to

PCB.

3620fa

7

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