LTM8061
32V, 2A µModule Li-Ion/
Polymer Battery Charger
FEATURES
DESCRIPTION
The LTM®8061 is a high efficiency 32V, 2A μModule®
standalone Li-Ion battery charger. It is optimized for one
and two-cell packs, with fixed float voltage options: 4.1V,
4.2V, 8.2V and 8.4V. The LTM8061 provides a constant-
current/constant-voltage charge characteristic, with
maximum charge current up to 2A. A precondition feature
trickle charges a depleted battery, and bad battery detec-
tion provides a signal and suspends charging if a battery
does not respond to preconditioning.
n
Wide Input Voltage Range: 4.95V to 32V
(40V Absolute Maximum)
Float Voltage Options:
n
1-Cell: 4.1V, 4.2V
2-Cell: 8.2V, 8.4V
n
Programmable Charge Current: Up to 2A
n
User-Selectable Charge Termination: C/10 or
Onboard Termination Timer
n
Dynamic Charge Rate Programming/Soft-Start Pin
n
Programmable Input Current Limit
The LTM8061 can be configured to terminate charging
when charge current falls to one-tenth the programmed
maximum current or to use an internal timer if a time-
based termination scheme is desired. Once charging is
terminated, the LTM8061 enters a low current standby
mode. An auto-restart feature starts a new charge cycle if
the battery voltage drops 2.5% from the float voltage, or
if a new battery is inserted into a charging system.
n
Optional Reverse Input Protection
n
NTC Resistor Temperature Monitor
n
0.5% Float Voltage Accuracy
n
Bad-Battery Detection with Auto-Reset
n
Tiny, Low Profile (9mm × 15mm × 4.32mm) Surface
Mount LGA Package
APPLICATIONS
The LTM8061 is packaged in a thermally enhanced, com-
pact (9mm × 15mm × 4.32mm) over-molded land grid
array (LGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8061 is
RoHS compliant.
n
Industrial Handheld Instruments
n
12V to 24V Automotive and Heavy Equipment
n
Professional Video/Camera Chargers
L, LT, LTC, LTM, Linear Technology, Linear logo, μModule and PolyPhase are registered
trademarks and PowerPath is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners
TYPICAL APPLICATION
Standalone Single Cell 2A Li-Ion Battery Charger
with C/10 Termination from 6V to 32V Input
Battery Charging Profile
2500
NORMAL CHARGING
2000
LTM8061-4.1
V
IN
V
V
V
BAT
INA
INC
IN
6V TO 32V
SINGLE
CELL
/CLP
BIAS
+
1500
1000
4.1V
BATTERY
RUN
RNG/SS
TMR
CHRG
FAULT
4.7μF
AVAILABLE OPTIONS:
1-CELL: 4.1V, 4.2V
2-CELL: 8.2V, 8.4V
NTC
500
PRECONDITION
GND
8061 TA01a
TERMINATION
0
0
1
3
4
2
BATTERY VOLTAGE (V)
8061 TA01b
8061f
1