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LTC4057ES5-4.2#TRMPBF

P1-P3P4-P6P7-P9P10-P12
LTC4057-4.2
1
4057f
■
Programmable Charge Current up to 800mA
■
No External MOSFET, Sense Resistor or Blocking
Diode Required
■
Constant-Current/Constant-Voltage Operation with
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
■
Charges Single Cell Li-Ion Batteries Directly from
USB Port
■
Preset 4.2V Charge Voltage with ±1% Accuracy
■
Current Monitor Pin for Charge Termination
■
25µA Supply Current in Shutdown Mode
■
Low Battery Charge Conditioning (Trickle Charging)
■
Soft-Start Limits Inrush Current
■
Available in a Low Profile (1mm) SOT-23 Package
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
Linear Li-Ion Battery
Charger with Thermal
Regulation in ThinSOT
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Wireless PDAs
■
Cellular Phones
■
Portable Electronics
The LTC
®
4057 is a constant-current/constant-voltage lin-
ear charger for single-cell lithium-ion batteries. Its
ThinSOT
TM
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.
Charge Curve (750mAh Battery)
LTC4057-4.2
PROG
GND
1.65k
4057 TA01a
SHDN
BAT
V
CC
ON OFF
1µF
V
IN
5V
600mA
1-CELL
4.2V Li-Ion
BATTERY
+
4
1
2
5
3
ThinSOT is a trademark of Linear Technology Corporation.
*U.S. Patent No. 6522118
TIME (HOURS)
0
CHARGE CURRENT (mA)
BATTERY VOLTAGE (V)
700
600
500
400
300
200
100
0
4.75
4.5
4.25
4.0
3.75
3.5
3.25
3.0
4057 TA01b
0.50.25 0.75 1.0 1.25 1.5 1.75 2.0 2.25
CONSTANT
CURRENT
CONSTANT
POWER
CONSTANT
VOLTAGE
V
CC
= 5V
θ
JA
= 130°C/W
R
PROG
= 1.65kΩ
T
A
= 25°C
LTC4057-4.2
2
4057f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Input Supply Voltage ● 4.25 6.5 V
I
CC
Input Supply Current I
BAT
= 0mA, R
PROG
= 2k ● 200 600 µA
Shutdown Mode (SHDN = 0V,
● 50 µA
V
CC
< V
BAT
, or V
CC
< V
UV
)
V
FLOAT
Regulated Output (Float) Voltage I
BAT
= 40mA, 0°C < T
A
< 85°C 4.158 4.2 4.242 V
I
BAT
BAT Pin Charge Current R
PROG
= 10k; Current Mode ● 93 100 107 mA
R
PROG
= 2k; Current Mode ● 465 500 535 mA
Shutdown Mode (SHDN = 0V) ±1 ±2 µA
Sleep Mode (V
CC
= 0V) ±1 ±2 µA
I
TRIKL
Trickle Charge Current V
BAT
< 2.9V; R
PROG
= 2k (I
CHG
= 500mA) ● 20 50 70 mA
V
TRIKL
Trickle Charge Threshold Voltage R
PROG
= 10k; V
BAT
Rising 2.8 2.9 3.0 V
Hysteresis 60 80 110 mV
V
UV
V
CC
Undervoltage Lockout Voltage From Low to High ● 3.7 3.8 3.9 V
Hysteresis
● 150 200 300 mV
V
ASD
V
CC
- V
BAT
Lockout Threshold Voltage V
CC
from Low to High 70 100 150 mV
V
CC
from High to Low 5 30 70 mV
V
PROG
PROG Pin Voltage R
PROG
= 10k; Current Mode ● 0.93 1.0 1.07 V
V
SHDN-IL
SHDN Pin Input Low Voltage 0.4 0.65 V
V
SHDN-IH
SHDN Pin Input High Voltage 0.65 1.0 V
I
SHDN
SHDN Pin Input Current V
SHDN
= 5V ● 515 µA
T
LIM
Junction Temperature in 120 °C
Constant-Temperature Mode
R
ON
Power FET “ON” Resistance 600 mΩ
(Between V
CC
and BAT)
t
SS
Soft-Start Time I
BAT
= 0 to I
BAT
= 1000V/R
PROG
100 µs
(Note 1)
Input Supply Voltage (V
CC
) ........................–0.3V to 10V
PROG.............................................. –0.3V to V
CC
+ 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
ORDER PART
NUMBER
S5 PART
MARKING
T
JMAX
= 125°C, (θ
JA
= 100°C/W TO 150°C/W
DEPENDING ON PC BOARD LAYOUT)
(NOTE 3)
LTAEW
LTC4057ES5-4.2
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V
Consult LTC Marketing for parts specified with wider operating temperature ranges.
5 PROG
4 V
CC
SHDN 1
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
GND 2
BAT 3
LTC4057-4.2
3
4057f
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC4057 is guaranteed to meet performance specifications from
0°C to 70°C. Specifications over the –40°C to 85°C operating temperature
ELECTRICAL CHARACTERISTICS
range are assured by design, characterization and correlation with statistical
process controls.
Note 3: See Thermal Considerations.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
V
PROG
(V)
V
CC
(V)
4.0
V
PROG
(V)
1.015
1.010
1.005
1.000
0.995
0.990
0.985
4.5
5.0 5.5 6.0
4057 G01
6.5 7.0
TEMPERATURE (°C)
–50 –25 0 5025
75
100
4057 G02
1.0100
1.0075
1.0050
1.0025
1.0000
0.9975
0.9950
0.9925
0.9900
V
PROG
(V)
0
I
BAT
(mA)
600
500
400
300
200
100
0
0.25
0.50 0.75 1.00
4057 G03
1.25
V
CC
= 5V
V
BAT
= 4V
T
A
= 25°C
R
PROG
= 10k
V
CC
= 5V
V
BAT
= 4V
R
PROG
= 10k
V
CC
= 5V
T
A
= 25°C
R
PROG
= 2k
V
FLOAT
(V)
V
FLOAT
(V)
4057 G04
4.26
4.24
4.22
4.20
4.18
4.16
4.14
4.12
4.10
I
BAT
(mA)
0
100
200 300 400 500 700600
V
CC
(V)
4.0
4.215
4.210
4.205
4.200
4.195
4.190
4.185
4.5
5.0 5.5 6.0
4057 G06
6.5 7.0
V
CC
= 5V
T
A
= 25°C
R
PROG
= 1.25k
T
A
= 25°C
R
PROG
= 10k
TEMPERATURE (°C)
–50
V
FLOAT
(V)
100
050–25 25 75
4.220
4.215
4.210
4.205
4.200
4.195
4.190
4.185
4.180
4057 G05
V
CC
= 5V
R
PROG
= 10k
PROG Pin Voltage vs Supply
Voltage (Constant Current Mode)
PROG Pin Voltage vs Temperature
(Constant Current Mode)
Charge Current vs PROG Pin
Voltage
Regulated Output (Float) Voltage
vs Charge Current
Regulated Output (Float) Voltage
vs Temperature
Regulated Output (Float) Voltage
vs Supply Voltage
P1-P3P4-P6P7-P9P10-P12

LTC4057ES5-4.2#TRMPBF

Mfr. #:
Buy LTC4057ES5-4.2#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Monolithic Li-Ion Battery Charger w/o term.
Lifecycle:
New from this manufacturer.
Delivery:
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