ltc3445euf-pbf Linear Technology Corporation, ltc3445euf-pbf Datasheet - Page 8

• Manufacturer Part Number: ltc3445euf-pbf
• Description: I2c Controllable Buck Regulator With Two Ldos In A 4mm ? 4mm Qfn
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
V
above 3V. Must be ≤ V
V
V
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): I
ground.
SDA (Pin 6): I
NC (Pin 7): Not Connected.
SCL (Pin 8): I
ADD6 (Pin 9): I
ground.
GND (Pin 11): Buck NFET Ground.
NC (Pin 12): Not Connected.
LTC3445
8
TRACK
BACKUP
CC1
U
(Pins 3, 10): Power Supply (2.5V to 5.5V). Both V
(Pin 1): Supply Sense that V
(Pin 2): Back-Up Battery Input.
U
2
2
C Clock Input.
C Data Input.
2
2
C Strappable Address (Bit 7)—V
C Strappable Address (Bit 6)—V
U
CC1
.
CC
BATT Tracks when
CC1
CC1
CC1
or
or
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 ≤ V
NC (Pin 16): Not Connected.
FB (Pin 17): Buck Regulator Feedback.
V
BATTFAULT (Pin 19): Open-Drain Output. It is low when
V
LDO1FB (Pin 20): LDO1 Regulator Sense.
LDO1 (Pin 21): LDO1 Regulator Output.
V
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.
CC
CC1
CC2
BATT (Pin 18): V
is low.
(Pin 22): LDO Regulator Supply Voltage.
CC
BATT PowerPath Output.
CC1
.
3445fa