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PDF LTC4057-4.2 Data sheet ( Hoja de datos )
| Número de pieza | LTC4057-4.2 | |
| Descripción | Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4057- 4.2www.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
CONSTANT
VOLTAGE
4.75
4.5
4.25
400 4.0
300 3.75
200 3.5
VCC = 5V
100
θJA = 130°C/W
RPROG = 1.65kΩ
TA = 25°C
0
3.25
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
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1 page  
LTC4057- 4.2www.DataSheet4U.com
PI FU CTIO S
BLOCK DIAGRA
SHDN (Pin 1): Shutdown Input. Pulling this pin low puts
the LTC4057 in shutdown mode, thus stopping the charge
current. In shutdown mode, the input supply current
drops to 25µA and the battery drain current drops to less
than 2µA. This pin has an internal 1MΩ resistor to GND.
GND (Pin 2): Ground.
BAT (Pin 3): Charge Current Output. Provides charge
current to the battery and regulates the final float voltage
to 4.2V. An internal precision resistor divider from this pin
sets the float voltage and is disconnected in shutdown
mode.
VCC (Pin 4): Positive Input Supply Voltage. Provides
power to the charger. VCC can range from 4.25V to 6.5V
and should be bypassed with at least a 1µF capacitor.
When VCC drops to within 30mV of the BAT pin voltage, the
LTC4057 enters shutdown mode, dropping IBAT to less
than 2µA.
PROG (Pin 5): Charge Current Program and Charge Cur-
rent Monitor Pin. The charge current is programmed by
connecting a 1% resistor, RPROG, to ground. When charg-
ing in constant-current mode, this pin servos to 1V. In all
modes, the voltage on this pin can be used to measure the
charge current using the following formula:
IBAT = (VPROG/RPROG) • 1000
This pin is clamped to approximately 2.4V. Driving this pin
to voltages beyond the clamp voltage will draw currents as
high as 1.5mA.
120°C
TDIE
SHDN 1
1MΩ
VCC
4
TA
CA
–+
+1
1×
–+
MA
1000×
3 BAT
5µA
+
VA
–
R1
R2
REF
1.21V
R3
1V
R4
0.1V
R5
C1
–+
2.9V TO BAT
5
PROG
RPROG
2
GND
4-57 BD
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5 Page 
PACKAGE DESCRIPTIO
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
0.62 0.95
MAX REF
1.22 REF
LTC4057- 4.2www.DataSheet4U.com
2.90 BSC
(NOTE 4)
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.20 BSC
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
NOTE:
(NOTE 3)
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
PIN ONE
0.95 BSC
0.80 – 0.90
1.00 MAX
1.90 BSC
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.01 – 0.10
S5 TSOT-23 0302
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.
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC4057-4.2.PDF ] | |
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