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Linear Technology Electronic Components Datasheet

LTC1730-4 Datasheet

Lithium-Ion Battery Pulse Charger

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LTC1730-4 pdf
FEATURES
s Complete Pulse Charger for 1-Cell Lithium-Ion
Batteries
s Sense Resistor Limits Maximum Current for Safety
s 1% Float Voltage Accuracy
s End-of-Charge (C/10) Detection Output
s Programmable Charge Termination Timer
s Internal 0.35NMOS Switch
s No Blocking Diode Required
s SEL Pin to Set Either 4.1V or 4.2V/Cell (LTC1730-4)
s Low-Battery Drain (1µA Max) when Input Supply Is
Removed
s Battery Temperature Sensing and Charge
Qualification
s Automatic Trickle Charge for Low-Battery
s Automatic Battery Refresh
U
APPLICATIO S
s Standalone Lithium-Ion Battery Charger
s Handheld Computers
s Cellular Telephones
LTC1730-4/LTC1730-4.2
Lithium-Ion Battery
Pulse Charger with
Overcurrent Protection
DESCRIPTIO
The LTC®1730 is a complete pulse charger for 1-cell
lithium-ion batteries. When charging a depleted cell, the
internal MOSFET is fully on allowing the current limited
input power source to provide charge current to the
battery, virtually eliminating heat generation in the charger.
As the battery accepts charge and approaches the pro-
grammed voltage, the internal MOSFET begins switching
off and on with the duty cycle gradually decreasing as the
battery approaches a fully charged condition. A program-
mable timer ends the charge cycle. The end-of-charge
condition is indicated at the CHRG pin when the average
charge current falls to C/10. Removing the input voltage
puts the LTC1730 into a sleep mode, dropping the battery
current drain to less than 1µA (maximum).
An external sense resistor limits the maximum charge
current as a safety precaution against a user connecting a
wall adapter with the incorrect or no current limit. The
internal MOSFET prevents reverse battery current from
flowing if the input voltage is shorted to ground, eliminat-
ing the need for a blocking diode.
The LTC1730-4 is available in the 16-pin SSOP package
and the LTC1730-4.2 is available in the 8-pin SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
1A, Single Cell 4.2V Li-Ion Battery Charger (8-Pin Package)
VIN = 4.5V TO 12V
WITH 1A CURRENT LIMIT
CHARGE STATUS
2
R1
1k
R3
4.1k D3
VCC
LTC1730ES8-4.2
7
GATE
3
CHRG
T
*NTC: DALE NTHS-1206N02
R4
10k
NTC*
1
SENSE
68
NTC/SHDN BAT
TIMER
CTIMER
0.1µF
5
GND
4
R2
10k
C3
0.047µF
RSENSE
0.05
0.022µF
1-CELL
Li-Ion
BATTERY
4.7
C1
1µF
1730 TA01
sn1730 1730fs
1


Linear Technology Electronic Components Datasheet

LTC1730-4 Datasheet

Lithium-Ion Battery Pulse Charger

No Preview Available !

LTC1730-4 pdf
LTC1730-4/LTC1730-4.2
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage (VCC) ............................................ 13.2V
SENSE, GATE, BAT,
TIMER, NTC/SHDN, SEL ............................ – 0.3V to VCC
CHRG, ACPR, FAULT ..............................– 0.3V to 13.2V
Operating Junction
Temperature Range (Note 2) .................. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
GND* 1
SENSE 2
VCC 3
ACPR 4
FAULT 5
CHRG 6
NC** 7
GND* 8
16 GND*
15 BAT
14 NC**
13 GATE
12 SEL
11 NTC/SHDN
10 TIMER
9 GND*
GN PACKAGE
16-LEAD PLASTIC SSOP
* FOUR CORNER PINS ARE FUSED TO
INTERNAL DIE ATTACH PADDLE FOR
HEAT SINKING. CONNECT THESE FOUR
PINS TO EXPANDED PC LANDS FOR
PROPER HEAT SINKING.
** NO INTERNAL CONNECTION
TJMAX = 125°C, θJA = 90°C/W
ORDER PART
NUMBER
LTC1730EGN-4
GN PART MARKING
17304
TOP VIEW
SENSE 1
VCC 2
CHRG 3
GND 4
8 BAT
7 GATE
6 NTC/SHDN
5 TIMER
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 110°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC1730ES8-4.2
S8 PART MARKING
173042
DC ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 6V unless otherwise noted.
SYMBOL
VCC
ICC
VBAT
IMAX
ITRICKL
VTRICKL
VASD
RDS(ON)
VSHDN
PARAMETER
Supply Voltage
Supply Current
Regulated Output Voltage
Maximum Charge Overcurrent
Trickle Charge Current
Trickle Charge Trip Threshold
Automatic Shutdown Threshold Voltage
(Sleep Mode)
Internal Switch On-Resistance
Shutdown Threshold Voltage
CONDITIONS
Charger On; Fast Charge Mode
Shutdown: VNTC/SHDN = 0V
Sleep Mode; VBAT = 4V
LTC1730ES8-4.2 (5V VCC 12V)
LTC1730EGN-4 (5V VCC 12V), SEL = GND
LTC1730EGN-4 (5V VCC 12V), SEL = VCC
RSENSE = 0.1
VBAT = 2V
(VCC – VBAT) Low to High
(VCC – VBAT) High to Low
VBAT = 4V
NTC/SHDN Pin High to Low
MIN TYP MAX UNITS
q 4.5
12 V
q
25
mA
q
25
mA
q 1 µA
q 4.158 4.2 4.242
q 4.059 4.1 4.141
q 4.158 4.2 4.242
V
V
V
q 0.7 1 1.3
A
15 35 60
mA
2.45 2.55
V
150 mV
0 mV
0.35
50
mV
sn1730 1730fs
2


Part Number LTC1730-4
Description Lithium-Ion Battery Pulse Charger
Maker Linear
Total Page 12 Pages
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1 LTC1730-4 Lithium-Ion Battery Pulse Charger Linear
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2 LTC1730-4.2 Lithium-Ion Battery Pulse Charger Linear
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