LTC4054ES5-4.2 Linear Technology Corporation, LTC4054ES5-4.2 Datasheet

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LTC4054ES5-4.2

Manufacturer Part Number
LTC4054ES5-4.2
Description
Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
Manufacturer
Linear Technology Corporation
Datasheet
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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking
Diode Required
Complete Linear Charger in ThinSOT
Single Cell Lithium-Ion Batteries
Constant-Current/Constant-Voltage Operation with
Thermal Regulation* to Maximize Charge Rate
Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly
from USB Port
Preset 4.2V Charge Voltage with 1% Accuracy
Charge Current Monitor Output for Gas
Gauging*
Automatic Recharge
Charge Status Output Pin
C/10 Charge Termination
25 A Supply Current in Shutdown
2.9V Trickle Charge Threshold (LTC4054)
Available Without Trickle Charge (LTC4054X)
Soft-Start Limits Inrush Current
Available in 5-Lead SOT-23 Package
Cellular Telephones, PDAs, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
1 F
600mA Single Cell Li-Ion Charger
U
4.5V TO 6.5V
LTC4054-4.2
GND
V
V
IN
CC
4
2
PROG
BAT
3
5
1.65k
U
600mA
4.2V
Li-Ion
BATTERY
405442 TA01a
TM
Package for
Thermal Regulation in ThinSOT
DESCRIPTIO
Li-Ion Battery Charger with
The LTC
voltage linear charger for single cell lithium-ion batteries.
Its ThinSOT package and low external component count
make the LTC4054 ideally suited for portable applications.
Furthermore, the LTC4054 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 regulates the charge current to limit the
die temperature during high power operation or high
ambient temperature. The charge voltage is fixed at 4.2V,
and the charge current can be programmed externally with
a single resistor. The LTC4054 automatically terminates
the charge cycle when the charge current drops to 1/10th
the programmed value after the final float voltage is
reached.
When the input supply (wall adapter or USB supply) is
removed, the LTC4054 automatically enters a low current
state, dropping the battery drain current to less than 2 A.
The LTC4054 can be put into shutdown mode, reducing
the supply current to 25 A.
Other features include charge current monitor, undervoltage
lockout, automatic recharge and a status pin to indicate
charge termination and the presence of an input voltage.
ThinSOT is a trademark of Linear Technology Corporation.
*U.S.Patent No. 6,522,118
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC4054-4.2/LTC4054X-4.2
®
4054 is a complete constant-current/constant-
Complete Charge Cycle (750mAh Battery)
700
600
500
400
300
200
100
0
0
V
R
T
CC
JA
A
PROG
CONSTANT
POWER
0.25
Standalone Linear
= 25 C
CONSTANT
CURRENT
= 130 C/W
= 5V
U
= 1.65k
0.5
0.75
TIME (HOURS)
TERMINATED
1.0
CHARGE
1.25
CONSTANT
VOLTAGE
1.5
1.75
2.0
405442 TAO1b
4.75
4.50
4.25
4.00
3.75
3.50
3.25
3.00
405442xf
1

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LTC4054ES5-4.2 Summary of contents

Page 1

... Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. *U.S.Patent No. 6,522,118 Complete Charge Cycle (750mAh Battery) ...

Page 2

... High to Low 10k (Note 6) PROG PROG R = 10k, Current Mode PROG CHRG I = 5mA CHRG FLOAT RECHRG ORDER PART NUMBER 5 PROG LTC4054ES5-4.2 LTC4054XES5-4 PART MARKING = LTH7 LTADY MIN TYP MAX UNITS 4.25 6.5 300 2000 200 500 25 50 4.158 4.2 4.242 93 100 107 465 ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER T Junction Temperature in Constant LIM Temperature Mode R Power FET “ON” Resistance ON (Between V and BAT Soft-Start Time SS t Recharge Comparator Filter Time RECHARGE ...

Page 4

LTC4054-4.2/LTC4054X-4 TYPICAL PERFOR A CE CHARACTERISTICS PROG Pin Pull-Up Current vs Temperature and Supply Voltage 3 4.3V BAT PROG 3 4.2V CC 3.3 3 6.5V CC 2.9 2.7 2.5 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS CHRG Pin Current vs Temperature (Weak Pull-Down State 4.3V BAT CHRG – 100 ...

Page 6

LTC4054-4.2/LTC4054X-4 CTIO S CHRG (Pin 1): Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down ...

Page 7

W BLOCK DIAGRA 120 DIE SHDN CHRG 1 STANDBY TRICKLE CHARGE DISABLED ON LTC4054X LTC4054-4.2/LTC4054X-4.2 1 – – – 0. – ...

Page 8

LTC4054-4.2/LTC4054X-4.2 U OPERATIO The LTC4054 is a single cell lithium-ion battery charger using a constant-current/constant-voltage algorithm. It can deliver up to 800mA of charge current (using a good thermal PCB layout) with a final float voltage accuracy of 1%. The ...

Page 9

U OPERATIO lockout conditions. A weak pull-down indicates that V meets the UVLO conditions and the LTC4054 is ready to charge. High impedance indicates that the LTC4054 is in undervoltage lockout mode: either V above the BAT pin voltage or ...

Page 10

LTC4054-4.2/LTC4054X-4 APPLICATIO S I FOR ATIO Stability Considerations The constant-voltage mode feedback loop is stable with- out an output capacitor provided a battery is connected to the charger output. With no battery present, an output capacitor is recommended ...

Page 11

U U APPLICATIO S I FOR ATIO The LTC4054 can be used above 45 C ambient, but the charge current will be reduced from 400mA. The approxi- mate current at a given ambient temperature can be approximated by: 120 C ...

Page 12

LTC4054-4.2/LTC4054X-4 APPLICATIO S I FOR ATIO BAT LTC4054-4 PROG GND Figure 3. A Circuit to Maximize Thermal Mode Charge Current Solving for I using the quadratic formula BAT I BAT ...

Page 13

... Figure 5. Using a Microprocessor to Determine CHRG State 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 14

LTC4054-4.2/LTC4054X-4 APPLICATIO S I FOR ATIO USB and Wall Adapter Power The LTC4054 allows charging from both a wall adapter and a USB port. Figure 7 shows an example of how to combine wall adapter and USB power ...

Page 15

PACKAGE DESCRIPTIO 0.62 MAX 3.85 MAX 2.62 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.20 BSC DATUM ‘A’ 0.30 – 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING ...

Page 16

... Port, Keeps Current Drawn from USB Port Constant, Keeps Battery Fresh, Use with the LTC4053, LTC1733, or LTC4054 www.linear.com 500mA BAT 330 LTC4054-4 CHRG PROG GND 2k 2 SHDN 405442 TA02 500mA BAT CC LTC4054-4 PROG 1 F GND 2 2k 405442 TA04 LT/TP 0903 1K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2003 405442xf ...

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