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Linear Technology Electronic Components Datasheet

LTC4057ES5-4.2 Datasheet

Linear Li-Ion Battery Charger

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LTC4057- 4.2 www.DataSheet4U.com
Linear Li-Ion Battery
Charger with Thermal
Regulation in ThinSOT
FEATURES
s Programmable Charge Current up to 800mA
s No External MOSFET, Sense Resistor or Blocking
Diode Required
s Constant-Current/Constant-Voltage Operation with
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
s Charges Single Cell Li-Ion Batteries Directly from
USB Port
s Preset 4.2V Charge Voltage with ±1% Accuracy
s Current Monitor Pin for Charge Termination
s 25µA Supply Current in Shutdown Mode
s Low Battery Charge Conditioning (Trickle Charging)
s Soft-Start Limits Inrush Current
s Available in a Low Profile (1mm) SOT-23 Package
U
APPLICATIO S
s Wireless PDAs
s Cellular Phones
s Portable Electronics
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
*U.S. Patent No. 6522118
DESCRIPTIO
The LTC®4057 is a constant-current/constant-voltage lin-
ear charger for single-cell lithium-ion batteries. Its
ThinSOTTM package and low external component count
make the LTC4057 especially well suited for portable
applications. Furthermore, the LTC4057 is specifically
designed to work within USB power specifications.
No external sense resistor is needed and no blocking diode
is required due to the internal MOSFET architecture.
Thermal feedback prevents overheating by regulating the
charge current to limit the die temperature during high
power operation or high ambient temperature conditions.
The charge voltage is preset at 4.2V and the charge current
can be programmed externally with a single resistor.
When the input supply (wall adapter or USB supply) is
removed, the LTC4057 automatically enters a low current
state, dropping the battery drain current to less than 2µA.
With power applied, the LTC4057 can be put into shut-
down mode, reducing the supply current to 25µA.
For the standalone version (on-board charge termination)
of the LTC4057, refer to the LTC4054.
TYPICAL APPLICATIO
VIN
5V
4
VCC
3
BAT
LTC4057-4.2
ON OFF
1µF
1 SHDN PROG 5
GND
2
600mA
1.65k
+ 1-CELL
4.2V Li-Ion
BATTERY
4057 TA01a
Charge Curve (750mAh Battery)
700
CONSTANT
CURRENT
600
CONSTANT
POWER
500
4.75
4.5
CONSTANT
VOLTAGE
4.25
400
4.0
300
3.75
200
3.5
VCC = 5V
100
θJA = 130°C/W
RPROG = 1.65k
3.25
TA = 25°C
0
3.0
0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25
TIME (HOURS)
4057 TA01b
4057f
1


Linear Technology Electronic Components Datasheet

LTC4057ES5-4.2 Datasheet

Linear Li-Ion Battery Charger

No Preview Available !

LTC4057- 4.2
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VCC) ........................– 0.3V to 10V
PROG .............................................. – 0.3V to VCC + 0.3V
BAT ..............................................................– 0.3V to 7V
SHDN .........................................................– 0.3V to 10V
BAT Short Circuit Duration ........................... Continuous
BAT Pin Current .................................................. 800mA
PROG Pin Current ................................................ 800µA
Junction Temperature ........................................... 125°C
Operating Ambient Temperature Range
(Note 2) .............................................. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
www.DataSheet4U.com
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SHDN 1
GND 2
BAT 3
5 PROG
4 VCC
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 125°C, (θJA = 100°C/W TO 150°C/W
DEPENDING ON PC BOARD LAYOUT)
(NOTE 3)
ORDER PART
NUMBER
LTC4057ES5-4.2
S5 PART
MARKING
LTAEW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V
SYMBOL
VCC
ICC
VFLOAT
IBAT
ITRIKL
VTRIKL
VUV
VASD
VPROG
VSHDN-IL
VSHDN-IH
ISHDN
TLIM
RON
tSS
PARAMETER
Input Supply Voltage
Input Supply Current
Regulated Output (Float) Voltage
BAT Pin Charge Current
Trickle Charge Current
Trickle Charge Threshold Voltage
VCC Undervoltage Lockout Voltage
VCC - VBAT Lockout Threshold Voltage
PROG Pin Voltage
SHDN Pin Input Low Voltage
SHDN Pin Input High Voltage
SHDN Pin Input Current
Junction Temperature in
Constant-Temperature Mode
Power FET “ON” Resistance
(Between VCC and BAT)
Soft-Start Time
CONDITIONS
IBAT = 0mA, RPROG = 2k
Shutdown Mode (SHDN = 0V,
VCC < VBAT, or VCC < VUV)
IBAT = 40mA, 0°C < TA < 85°C
RPROG = 10k; Current Mode
RPROG = 2k; Current Mode
Shutdown Mode (SHDN = 0V)
Sleep Mode (VCC = 0V)
VBAT < 2.9V; RPROG = 2k (ICHG = 500mA)
RPROG = 10k; VBAT Rising
Hysteresis
From Low to High
Hysteresis
VCC from Low to High
VCC from High to Low
RPROG = 10k; Current Mode
VSHDN = 5V
IBAT = 0 to IBAT = 1000V/RPROG
MIN TYP MAX UNITS
q 4.25
6.5
V
q
200 600
µA
q
50
µA
4.158 4.2 4.242
V
q 93
100 107
mA
q 465
500
535
mA
±1
±2
µA
±1
±2
µA
q 20
50
70
mA
2.8
2.9
3.0
V
60
80
110
mV
q 3.7
3.8
3.9
V
q 150
200
300
mV
70
100 150
mV
5
30
70
mV
q 0.93
1.0
1.07
V
0.4 0.65
V
0.65 1.0
V
q
5
15
µA
120
°C
600
m
100
µs
4057f
2


Part Number LTC4057ES5-4.2
Description Linear Li-Ion Battery Charger
Maker Linear
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