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LTC1730ES8-4.2#TRPBF

P1-P3P4-P6P7-P9P10-P12
LTC1730-4/LTC1730-4.2
1
sn1730 1730fs
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
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.
■
Standalone Lithium-Ion Battery Charger
■
Handheld Computers
■
Cellular Telephones
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
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 0.35Ω NMOS Switch
■
No Blocking Diode Required
■
SEL Pin to Set Either 4.1V or 4.2V/Cell (LTC1730-4)
■
Low-Battery Drain (1µA Max) when Input Supply Is
Removed
■
Battery Temperature Sensing and Charge
Qualification
■
Automatic Trickle Charge for Low-Battery
■
Automatic Battery Refresh
Lithium-Ion Battery
Pulse Charger with
Overcurrent Protection
R1
1k
R2
10k
4.7Ω
R
SENSE
0.05Ω
1-CELL
Li-Ion
BATTERY
D3
R3
4.1k
CHRG
NTC/SHDN
GATE
BAT
TIMER
C
TIMER
0.1µF
GND
54
V
CC
2
LTC1730ES8-4.2
SENSE
C1
1µF
C3
0.047µF
0.022µF
3
6
1
7
8
V
IN
= 4.5V TO 12V
WITH 1A CURRENT LIMIT
CHARGE STATUS
1730 TA01
R4
10k
NTC*
T
*NTC: DALE NTHS-1206N02
1A, Single Cell 4.2V Li-Ion Battery Charger (8-Pin Package)
LTC1730-4/LTC1730-4.2
2
sn1730 1730fs
Supply Voltage (V
CC
) ............................................ 13.2V
SENSE, GATE, BAT,
TIMER, NTC/SHDN, SEL ............................ –0.3V to V
CC
CHRG, ACPR, FAULT ..............................–0.3V to 13.2V
ORDER PART
NUMBER
S8 PART MARKING
T
JMAX
= 125°C, θ
JA
= 110°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
173042
LTC1730ES8-4.2
ABSOLUTE AXI U RATI GS
W
WW
U
(Note 1)
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 6V unless otherwise noted.
1
2
3
4
8
7
6
5
TOP VIEW
BAT
GATE
NTC/SHDN
TIMER
SENSE
V
CC
CHRG
GND
S8 PACKAGE
8-LEAD PLASTIC SO
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage ● 4.5 12 V
I
CC
Supply Current Charger On; Fast Charge Mode ● 25 mA
Shutdown: V
NTC/SHDN
= 0V ● 25 mA
Sleep Mode; V
BAT
= 4V ● 1 µA
V
BAT
Regulated Output Voltage LTC1730ES8-4.2 (5V ≤ V
CC
≤ 12V) ● 4.158 4.2 4.242 V
LTC1730EGN-4 (5V ≤ V
CC
≤ 12V), SEL = GND ● 4.059 4.1 4.141 V
LTC1730EGN-4 (5V ≤ V
CC
≤ 12V), SEL = V
CC
● 4.158 4.2 4.242 V
I
MAX
Maximum Charge Overcurrent R
SENSE
= 0.1Ω ● 0.7 1 1.3 A
I
TRICKL
Trickle Charge Current V
BAT
= 2V 15 35 60 mA
V
TRICKL
Trickle Charge Trip Threshold 2.45 2.55 V
V
ASD
Automatic Shutdown Threshold Voltage (V
CC
– V
BAT
) Low to High 150 mV
(Sleep Mode) (V
CC
– V
BAT
) High to Low 0 mV
R
DS(ON)
Internal Switch On-Resistance V
BAT
= 4V 0.35 Ω
V
SHDN
Shutdown Threshold Voltage NTC/SHDN Pin High to Low 50 mV
DC ELECTRICAL CHARACTERISTICS
ORDER PART
NUMBER
LTC1730EGN-4
1
2
3
4
5
6
7
8
TOP VIEW
GN PACKAGE
16-LEAD PLASTIC SSOP
16
15
14
13
12
11
10
9
GND*
SENSE
V
CC
ACPR
FAULT
CHRG
NC**
GND*
GND*
BAT
NC**
GATE
SEL
NTC/SHDN
TIMER
GND*
* 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
T
JMAX
= 125°C, θ
JA
= 90°C/W
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
GN PART MARKING
17304
LTC1730-4/LTC1730-4.2
3
sn1730 1730fs
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1730-4/LTC1730-4.2 are guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
CHRG
CHRG Pin Pull-Down Current V
CHRG
= 1V, C/10 Mode 10 40 70 µA
T
TIMER
TIMER Accuracy C
TIMER
= 0.1µF10%
V
GATE
GATE Pin Voltage V
BAT
= 3V 7.5 V
V
BAT
= 4V 10 V
T
SHDN
Thermal Shutdown Temperature 140 °C
∆T
SHDN
Thermal Shutdown Hysteresis 5 °C
∆V
RECHRG
Recharge Battery Voltage Offset from V
BAT(Full Charged)
– V
RECHRG
(Note 3) 150 mV
Full Charged Battery Voltage
V
NTC_HOT
NTC/SHDN Pin Threshold Voltage (Hot) High to Low; V
CC
= 4V ● 1.95 2 2.05 V
Hysteresis 50 mV
V
NTC_COLD
NTC/SHDN Pin Threshold Voltage (Cold) Low to High; V
CC
= 4V ● 3.4 3.5 3.6 V
Hysteresis 45 mV
V
SEL
SEL Pin Threshold LTC173ECGN-4 0.7 V
V
ACPR
ACPR Pin Output Low Voltage LTC1730EGN-4, I
ACPR
= 5mA 0.6 V
V
FAULT
FAULT Pin Output Low Voltage LTC1730EGN-4, I
FAULT
= 3mA 1.2 V
V
CHRG
CHRG Pin Output Low Voltage I
CHRG
= 5mA, Charging Mode 0.9 V
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 6V unless otherwise noted.
DC ELECTRICAL CHARACTERISTICS
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: For the LTC1730-4 version, the full charged V
BAT
value is
typically 4.1V.
P1-P3P4-P6P7-P9P10-P12

LTC1730ES8-4.2#TRPBF

Mfr. #:
Buy LTC1730ES8-4.2#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Lithium-Ion Bat Pulse Chrs w/ Overcurren
Lifecycle:
New from this manufacturer.
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