LTC1729_1 Datasheet, PDF (1/16 Pages) Linear Technology – Li-Ion Battery Charger Termination Controllers

FEATURES
s _{Built-In Termination: 3-Hour Time-Out}
s _{C/10 Detection with Status Indicator}
s _{Trickle Charge Preconditioning If Cell < 2.7V}
s _{Charging Enabled When 0°C < T < 50°C}
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
APPLICATIO S
s _{Cellular Phones}
s _PDAs
s _{Cradle Chargers}
s _Camcorders
LTC1729 Series
Li-Ion Battery Charger
Termination Controllers
DESCRIPTIO
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 APPLICATIO
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
+ _COUT***
22µF
+
4.2V
MBRM120T3
INPUT POWER
C_IN*
10µF
8.2V TO 20V
200Ω
LTC1729-4.2
1
OVP
8
V_CC
2
7
BAT
V_C
1µF ₃
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)
1