LTC3567 Datasheet, PDF (11/28 Pages) Linear Technology – High Effi ciency USB Power Manager Plus 1A Buck-Boost Converter with I2C Control

LTC3567
PIN FUNCTIONS
CHRGEN (Pin 23): Logic Input. This logic input pin in-
dependently enables the battery charger. Active low. Has a
1.6μA internal pull-down current source. This pin is logically
ORed with its corresponding bit in the I²C serial port.
EN1 (Pin 24): Logic Input. This logic input pin indepen-
dently enables the buck-boost switching regulator. Active
high. Has a 1.6μA internal pull-down current source. This
pin is logically ORed with its corresponding bit in the I²C
serial port.
Exposed Pad (Pin 25): Ground. Buck-Boost logic and USB
power manager ground connections. The Exposed Pad
should be connected to a continuous ground plane on the
printed circuit board directly under the LTC3567.
BLOCK DIAGRAM
21 ^VBUS
CLPROG
2
NTC
3
CHRG
16
CHRGEN
23
EN1
24
8 ^DVCC
SDA
14
SCL
13
SUSPEND LDO
500μA/2.5mA
–
BATTERY
TEMPERATURE
+
MONITOR
CHARGE
STATUS
1.2V
CHRGEN
ILIM
DECODE
LOGIC
I²C PORT
2.25MHz PowerPath
BUCK REGULATOR
SW
22
LDO3V3
3.3V LDO
1
3.6V
ENABLE
MODE
IDEAL
CC/CV
CHARGER
+–
0.3V
V_OUT
20
+
GATE
18
–
15mV
BAT
19
PROG
15
V_{IN1 9}
SWAB1
7
D/A
4
1A, 2.25MHz
BUCK-BOOST
REGULATOR
V_OUT1
10
SWCD1
11
GND
6, 12, 17, 25
FB1
4
V_C1
5
3567 BD
3567f
11