LTC1729 Datasheet, PDF (1/12 Pages) Linear Technology – Li-Ion Battery Charger Termination Controllers

Final Electrical Specifications
LTC1729 Series
Li-Ion Battery Charger
Termination Controllers
October 1999
FEATURES
s _{Trickle Charge Preconditioning If Cell < 2.7V}
s _{Charging Enabled When 0°C < T < 50°C}
s _{Built-In Termination: 3-Hour Time-Out}
s _{C/10 Detection with Status Indicator}
s _{Automatic Charger Present Detection}
s _{Automatic Battery Present Detection}
s _{1- or 2-Cell, 4.1V/Cell or 4.2V/Cell Options}
s _{Precision Internal 0.2% Voltage Feedback Divider}
s _{Compatible with LT1505/LT1510/LT1511/}
LT1512/LT1513/LT1769
s _{Small Footprint/Low Profile}
U
APPLICATIONS
s _{Cellular Phones}
s _PDAs
s _{Cradle Chargers}
s _Camcorders
DESCRIPTION
The LTC^®1729 series is a family of smart termination
controllers for lithium-ion battery chargers. These ICs
provide trickle charge preconditioning, temperature charge
qualification, time or charge current termination, auto-
matic charger and battery detection and status output.
Combining the LTC1729 series part with the LT^®1510
(1.5A), LT1769 (2A), LT1511 (3A) and LT1505 (> 4A)
step-down chargers is a simple operation. Connecting six
pins from the LTC1729 series part to the step-down
chargers completes the integration. The LTC1729 termi-
nation controllers are also compatible with step-down/
step-up (SEPIC) chargers, including the LT1512 (2A switch)
and LT1513 (3A switch).
The LTC1729 series is available in the 8-pin MSOP and SO
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
0.22µF
L1**
10µH
MMBD914L
MBRM120T3
SW
V_CC
LT1510-5
PROG
BOOST
GND
V_C
OVP
SENSE
BAT
1µF _{300Ω 6.19k}
1k
0.1µF
C_OUT***
22µF
+
4.2V
MBRM120T3
INPUT POWER
+
C_IN*
10µF
8.2V TO 20V
200Ω
1
OVP
8
V_CC
2
7
BAT
V_C
1µF
3 ^LTC1729-4.2
6
SENSE STATUS
4
GND
5
NTC
* TOKIN OR MARCON SURFACE MOUNT
** COILTRONICS TP3-100, 10µH, 2.2mm HEIGHT
(0.8A CHARGING CURRENT)
COILTRONICS TP1 SERIES, 10µH, 1.8mm
HEIGHT (<0.5A CHARGING CURRENT)
*** PANASONIC EEFCD1B220
† _{LUMEX SML-LX0805GW-TR}
0.1µF
1.4k
D1^†
CHARGE STATUS
1729 F01
10k NTC THERMISTOR, NTHS1206N02 VISHAY/DALE
NOTE: EITHER A THERMISTOR OR 10k RESISTOR MUST BE PRESENT
OPTION: TIE RESISTOR TO STATUS FOR
CHARGE TERMINATION AT
LOW CHARGING CURRENT
Figure 1. 500kHz Li-Ion Cell Phone Charger (0.8A)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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