Datasheet

LTC3625/LTC3625-1
7
3625f
pin FuncTions
V
MID
(Pin 10): Midpoint of Two Series Supercapacitors.
The pin voltage is monitored and used, along with V
OUT
,
to enable or shut down the buck and boost converters
during charging to achieve voltage balancing of the top
and bottom supercapacitors.
V
OUT
(Pin 11): Output Voltage Pin. Connect V
OUT
to the
positive terminal of the top supercapacitor. The pin volt-
age is monitored and used, along with V
MID
, to enable or
shut down the buck and boost converters during charg-
ing to achieve voltage balancing of the top and bottom
supercapacitors.
SW2 (Pin 12): Switch Pin for the Boost Regulator. External
inductor connects between the SW2 pin and V
MID
. If CTL
is logic high, then SW2 must be connected to SW1.
GND (Exposed Pad Pin 13): Ground. The exposed pad
must be connected to a continuous ground plane on
the printed circuit board directly under the LTC3625/
L
TC3625
-1 for electrical contact and to achieve rated
thermal performance.
block DiagraM
8
–
+
PFO
7
PFI
1.20V
4.44V/4.90V (LTC3625)
3.7V/4.16V (LTC3625-1)
9
–
+
PGOOD
4
V
SEL
10
V
MID
THRESHOLD
DETECTOR
5
EN
3
CTL
V
MID_GOOD
SD_BUCK
6
13
2
PROG
MASTER
LOGIC
OVERTEMPERATURE
SHUTDOWN
1.2V
–
+
–
+
GND
SW1
V
IN
B
3625 BD
A
D
SD_BOOST
REF/R PROGRAMMED
AVG OUTPUT CURRENT
SYNCHRONOUS
BUCK CURRENT
REGULATOR
BUCK REGULATOR
BOOST REGULATOR
1
11
SW2
V
OUT
C
2A AVG
INPUT CURRENT
SYNCHRONOUS
BOOST CURRENT
REGULATOR
12
V
MAXER
V
IN
V
OUT