LTC3445 查看數據表（PDF） - Linear Technology

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LTC3445

3A/ 4MHz/ Monolithic Synchronous Step-Down Regulator

Linear Technology 

LTC3445

PI FU CTIO S

VTRACK (Pin 1): Supply Sense that VCC BATT Tracks when

above 3V. Must be ≤ VCC1.

VBACKUP (Pin 2): Back-Up Battery Input.

VCC1 (Pins 3, 10): Power Supply (2.5V to 5.5V). Both VCC1

pins must be connected externally to the 2.5V to 5.5V

supply.

PGOOD (Pin 4): Fault Report (Undervoltage). Open-drain

driver sinks current whenever LDO1, LDO2 or buck out-

puts are low.

ADD7 (Pin 5): I2C Strappable Address (Bit 7)—VCC1 or

ground.

SDA (Pin 6): I2C Data Input.

NC (Pin 7): Not Connected.

SCL (Pin 8): I2C Clock Input.

ADD6 (Pin 9): I2C Strappable Address (Bit 6)—VCC1 or

ground.

GND (Pin 11): Buck NFET Ground.

NC (Pin 12): Not Connected.

NC (Pin 13): Not Connected.

SW (Pin 14): Buck Regulator Switch.

RUN (Pin 15): Chip Enable. 1.5V enables the part. Forcing

this pin below 0.3V shuts down the device. In shutdown,

all functions are disabled, drawing <35µA supply current.

Do not leave RUN floating. Must be ≤ VCC1.

NC (Pin 16): Not Connected.

FB (Pin 17): Buck Regulator Feedback.

VCC BATT (Pin 18): VCC BATT PowerPath Output.

BATTFAULT (Pin 19): Open-Drain Output. It is low when

VCC1 is low.

LDO1FB (Pin 20): LDO1 Regulator Sense.

LDO1 (Pin 21): LDO1 Regulator Output.

VCC2 (Pin 22): LDO Regulator Supply Voltage.

LDO2 (Pin 23): LDO2 Regulator Output.

LDO2FB (Pin 24): LDO2 Regulator Sense.

Exposed Pad (Pin 25): Ground. Must be soldered to PCB

ground for electrical contact and optimum thermal

performance.

3445fa

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