LTC1729 Series
Li-Ion Battery Charger
Termination Controllers
FEATURES
DESCRIPTIO
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Built-In Termination: 3-Hour Time-Out The LTC 1729 series is a family of smart termination
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C/10 Detection with Status Indicator controllers for lithium-ion battery chargers. These ICs
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Trickle Charge Preconditioning If Cell <2.7V provide trickle charge preconditioning, temperature charge
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Charging Enabled When 0 C < T < 50 C qualification, time or charge current termination, auto-
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Automatic Charger Present Detection matic charger and battery detection and status output.
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Automatic Battery Present Detection
Combining the LTC1729 series part with the LT 1510
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1- or 2-Cell, 4.1V/Cell or 4.2V/Cell Options
(1.5A), LT1769 (2A), LT1511 (3A) and LT1505 (>4A)
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Precision Internal 0.2% Voltage Feedback Divider
step-down chargers is a simple operation. Connecting six
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Compatible with LT1505/LT1510/LT1511/
pins from the LTC1729 series part to the step-down
LT1512/LT1513/LT1769
chargers completes the integration. The LTC1729 termi-
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Small Footprint/Low Profile
nation controllers are also compatible with step-down/
U
step-up (SEPIC) chargers, including the LT1512 (2A switch)
APPLICATIO S
and LT1513 (3A switch).
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Cellular Phones
The LTC1729 series is available in the 8-pin MSOP and SO
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PDAs
packages.
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Cradle Chargers
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Camcorders
TYPICAL APPLICATIO
MBRM120T3
MBRM120T3
INPUT POWER
SW V
CC
8.2V TO 20V
C *
IN
1F
6.19k
LT1510-5
0.22F 10F
300
PROG
L1**
BOOST
10H
1k
GND V
C
MMBD914L
0.1F
OVP
SENSE
BAT
+
+
C ***
OUT 4.2V
22F
LTC1729-4.2
1 8
0.1F
OVP V
CC 1.4k
2 7
D1
BAT V
C
CHARGE STATUS
200 1F
3 6
SENSE STATUS
1729 F01
4 5
GND NTC
10k NTC THERMISTOR, NTHS1206N02 VISHAY/DALE
NOTE: EITHER A THERMISTOR OR 10k RESISTOR MUST BE PRESENT
* TOKIN OR MARCON SURFACE MOUNT
** COILTRONICS TP3-100, 10H, 2.2mm HEIGHT
OPTION: TIE RESISTOR TO STATUS FOR
(0.8A CHARGING CURRENT)
CHARGE TERMINATION AT
COILTRONICS TP1 SERIES, 10H, 1.8mm
LOW CHARGING CURRENT
HEIGHT (<0.5A CHARGING CURRENT)
*** PANASONIC EEFCD1B220
LUMEX SML-LX0805GW-TR
Figure 1. 500kHz Li-Ion Cell Phone Charger (0.8A)
1
U
ULTC1729 Series
ABSOLUTE AXI U RATI GS (Note 1)
V ......................................................................... 30V STATUS .................................................... 0.3V to 30V
CC
SENSE, V , NTC .................................... 0.3V to 15V Operating Temperature Range .................... 0 C to 70 C
BAT
V ............................................................. 0.3V to 15V Storage Temperature Range ................ 65 C to 150 C
C
OVP ............................................................ 0.3V to 5V Lead Temperature (Soldering, 10 sec)................. 300 C
UUW
PACKAGE/ORDER I FOR ATIO
ORDER PART ORDER PART
NUMBER NUMBER
TOP VIEW
LTC1729CMS8-4.1 LTC1729CS8-4.1
TOP VIEW
OVP 1 8 V
CC
LTC1729CMS8-4.2 LTC1729CS8-4.2
OVP 1 8 V
CC
BAT 2 7 V
C
BAT 2 7 V
C LTC1729CMS8-8.2 LTC1729CS8-8.2
SENSE 3 6 STATUS
SENSE 3 6 STATUS
LTC1729CMS8-8.4 LTC1729CS8-8.4
5 NTC
GND 4
GND NTC
4 5
MS8 PACKAGE
S8 PART MARKING
MS8 PART MARKING
8-LEAD PLASTIC MSOP
S8 PACKAGE
T = 150 C, q = 200 C/ W
JMAX JA 8-LEAD PLASTIC SO
LTLY 172941
T = 150 C, q = 150 C/ W
JMAX JA
LTJH 172942
LTLZ 172982
LTJG 172984
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25 C, V = 8V
A IN
LTC1729-4.1/LTC1729-4.2
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
I V Supply Current V = 5V (Below UVLO) l 15 12 m A
CC CC IN
V = 8V, V > 4.5V, No Bat l 1.0 1.4 2.0 mA
IN BAT
V = 8V, V = 2.5V Trickle 10 17 21 mA
IN BAT
V = 8V, V = 3.5V Charge l 0.5 3.0 5.0 mA
IN BAT
V V Undervoltage Lockout High l 5.5 6.5 7.5 V
LKOH IN
V V Undervoltage Lockout Low l 5.0 6.0 7.0 V
LKOL IN
I V Current V = 5V (Below UVLO), V = 4.2V l 1 0.1 1 m A
VBAT BAT IN BAT
V = 8V, V = 4.25V No Bat l 40 73 120 m A
IN BAT
V = 8V, V = 2.5V Trickle 19 12 9.5 mA
IN BAT
V = 8V, V = 3.5V Charge l 2.7 1.3 0.5 mA
IN BAT
V V Clamp No Bat (External 200m A Pull-Up on V ) l 4.25 4.5 4.75 V
CLAMP BAT BAT
V High V Threshold High Going Threshold l 4.25 4.51 4.75 V
MAX BAT
Low Going Threshold l 4.25 4.50 4.75 V
V Low V Threshold High Going Threshold l 2.55 2.7 2.85 V
MIN BAT
Low Going Threshold l 2.45 2.6 2.75 V
I SENSE Pin Current Charge State, V = 3V l 85 100 115 m A
SENSE SENSE
V SENSE Pin C/10 Offset Charge State, V = (V V ) l 1 2.5 mV
C10 C10 BAT SENSE
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