LTC1730ES8-4.2 Linear Technology, LTC1730ES8-4.2 Datasheet

IC BATT PULSE CHRGR LI-ION 8SOIC

LTC1730ES8-4.2

Manufacturer Part Number
LTC1730ES8-4.2
Description
IC BATT PULSE CHRGR LI-ION 8SOIC
Manufacturer
Linear Technology
Datasheet

Specifications of LTC1730ES8-4.2

Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion)
Voltage - Supply
4.5 V ~ 12 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1730ES8-4.2
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC1730ES8-4.2
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Complete Pulse Charger for 1-Cell Lithium-Ion
Batteries
Sense Resistor Limits Maximum Current for Safety
1% Float Voltage Accuracy
End-of-Charge (C/10) Detection Output
Programmable Charge Termination Timer
Internal 0.35 NMOS Switch
No Blocking Diode Required
SEL Pin to Set Either 4.1V or 4.2V/Cell (LTC1730-4)
Low-Battery Drain (1 A Max) when Input Supply Is
Removed
Battery Temperature Sensing and Charge
Qualification
Automatic Trickle Charge for Low-Battery
Automatic Battery Refresh
Standalone Lithium-Ion Battery Charger
Handheld Computers
Cellular Telephones
U
*NTC: DALE NTHS-1206N02
WITH 1A CURRENT LIMIT
V
1A, Single Cell 4.2V Li-Ion Battery Charger (8-Pin Package)
IN
CHARGE STATUS
U
= 4.5V TO 12V
T
R3
4.1k
R4
10k
NTC*
D3
R1
1k
C
TIMER
0.1 F
3
6
CHRG
NTC/SHDN
TIMER
LTC1730ES8-4.2
5
V
DESCRIPTIO
The LTC
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 1 A (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.
CC
2
SENSE
GND
, LTC and LT are registered trademarks of Linear Technology Corporation.
GATE
BAT
4
7
1
8
Overcurrent Protection
LTC1730-4/LTC1730-4.2
®
1730 is a complete pulse charger for 1-cell
R2
10k
1-CELL
Li-Ion
BATTERY
C3
0.047 F
0.022 F
Pulse Charger with
Lithium-Ion Battery
R
0.05
SENSE
U
1730 TA01
4.7
C1
1 F
sn1730 1730fs
1

Related parts for LTC1730ES8-4.2

LTC1730ES8-4.2 Summary of contents

Page 1

... 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. = 4.5V TO 12V LTC1730ES8-4.2 4.1k 7 GATE 3 CHRG 1 SENSE 8 6 NTC/SHDN BAT R4 ...

Page 2

... C, JMAX The denotes the specifications which apply over the full operating = unless otherwise noted CONDITIONS Charger On; Fast Charge Mode Shutdown NTC/SHDN Sleep Mode BAT LTC1730ES8-4.2 (5V V 12V) CC LTC1730EGN-4 (5V V 12V), SEL = GND CC LTC1730EGN-4 (5V V 12V), SEL = 0.1 SENSE BAT (V – V ...

Page 3

DC ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER I CHRG Pin Pull-Down Current CHRG T TIMER Accuracy TIMER V GATE Pin Voltage GATE T Thermal Shutdown Temperature SHDN T Thermal Shutdown Hysteresis SHDN V Recharge Battery ...

Page 4

LTC1730-4/LTC1730-4 TYPICAL PERFOR A CE CHARACTERISTICS Trickle Charge Current vs Input Supply Voltage (V) CC 1730 G01 ...

Page 5

... If the voltage at the BAT pin drops 150mV below final float voltage after the charge cycle has ended, the timer resets and a new charge cycle begins. LTC1730EGN-4 GND (Pins 16): Refer to LTC1730ES8-4.2 SENSE (Pin 2): Refer to LTC1730ES8-4.2 V (Pin 3): Refer to LTC1730ES8-4.2 CC ACPR (Pin 4): Wall Adapter Present Open-Drain Output. ...

Page 6

... TIMER (Pin 10): Refer to LTC1730ES8-4.2 NTC/SHDN (Pin 11): Refer to LTC1730ES8-4.2 SEL (Pin 12): 4.1V/4.2V Battery Selection Input. Ground- ing this pin will set the output float voltage to 4.1V, while connecting to V GATE (Pin 13): Refer to LTC1730ES8-4.2 BAT (Pin 15): Refer to LTC1730ES8-4.2 40mV C/10 STOP I MAX C4 ...

Page 7

U OPERATIO The LTC1730 is a complete lithium-ion battery pulse charger with an internal 0.35 N-MOSFET switch driven by an internal charge pump. The charge current is set by the current limit of the input supply (wall adapter). An external ...

Page 8

LTC1730-4/LTC1730-4 APPLICATIO S I FOR ATIO Stop Charging The charger is off when any of the following conditions exist. The voltage at the V pin is less than 40mV above CC V (sleep mode), or the potential at ...

Page 9

U U APPLICATIO S I FOR ATIO End-of-Charge (C/10) The LTC1730 includes a comparator to monitor the duty cycle at the GATE pin to detect a near end-of-charge condition. When the duty cycle falls below 10%, the comparator trips and ...

Page 10

LTC1730-4/LTC1730-4 APPLICATIO S I FOR ATIO Surface mount packages rely primarily on the copper leads (pins) to conduct the heat from the package to the sur- rounding PC board copper which is acting as a heat sink. The ...

Page 11

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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. ...

Page 12

... SEL 1, 8, 9,16 GND TIMER 0.1 F Using External N-MOSFET for Higher Charge Current 12V WITH 2A CURRENT LIMIT 10k LTC1730ES8-4.2 0.047 SENSE 3 7 CHRG GATE 6 8 NTC/SHDN BAT 0.022 F R3 10k NTC* TIMER GND TIMER 0.1 F COMMENTS CC/CV Charges Li-Ion Cells, 8-Lead MSOP Stand Alone Charger, Automatic Battery Detection, 10-Lead MSOP Most Compact ...

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