LINEAR TECHNOLOGY LTC4054-4.2, LTC4054X-4.2 Technical data

Final Electrical Specifications

查询LTC4054供应商

LTC4054-4.2/LTC4054X-4.2

Standalone Linear

Li-Ion Battery Charger with

Thermal Regulation in ThinSOT

FEATURES

■

Programmable Charge Current Up to 800mA

■

No External MOSFET, Sense Resistor or Blocking
Diode Required

■

Complete Linear Charger in ThinSOTTM Package for
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

■

25µA Supply Current in Shutdown

■

2.9V Trickle Charge Threshold (LTC4054)

■

Available Without Trickle Charge (LTC4054X)

■

Soft-Start Limits Inrush Current

U

APPLICATIO S

■

Cellular Telephones, PDAs

■

Portable MP3 Players

■

Charging Docks and Cradles

■

Bluetooth Applications

U

February 2003

DESCRIPTIO

The LTC®4054 is a complete constant-current/constant­voltage linear charger for single cell lithium-ion batteries.
Its ThinSOT package and low external component count
make the LTC4054 especially well-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 2µA.
The LTC4054 can be put into shutdown mode, reducing
the supply current to 25µA.

Other features include charge current monitor, undervoltage
lockout, automatic recharge and a status pin to indicate
charge termination and the presence of input voltage.

, LTC and LT are registered trademarks of Linear Technology Corporation.

ThinSOT is a trademark of Linear Technology Corporation.

TYPICAL APPLICATIO

600mA Single Cell Li-Ion Charger

4.5V TO 5.25V

1µF

LTC4054-4.2

U

Complete Charge Cycle (750mAh Battery)

700

600

V

IN

4

V

GND

3

CC

BAT

5

PROG

2

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 represen­tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

1.65k

600mA

4.2V
Li-Ion
BATTERY

405442 TA01a

CONSTANT

500

POWER

400

300

200

CHARGE CURRENT (mA)

VCC = 5V

θ

JA

100

R

PROG

= 25°C

T

A

0

0.25 0.75 1.25 1.75

0

CONSTANT

CURRENT

CONSTANT

VOLTAGE

= 130°C/W

= 1.65k

0.5 1.0 2.0

CHARGE

TERMINATED

TIME (HOURS)

1.5

4.75

4.50

BATTERY VOLTAGE (V)

4.25

4.00

3.75

3.50

3.25

3.00

405442 TAO1b

405442i

1

LTC4054-4.2/LTC4054X-4.2

PACKAGE/ORDER I FOR ATIO

UU

W

CHRG 1

GND 2

TOP VIEW

S5 PACKAGE

5-LEAD PLASTIC TSOT-23

BAT 3

5 PROG

4 V

CC

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Input Supply Voltage (VCC) ......................... –0.3 to 10V

PROG............................................. –0.3V to VCC + 0.3V

BAT, CHRG ................................................. –0.3V to 7V

BAT Short-Circuit Duration .......................... Continuous

BAT Pin Current ................................................. 800mA

PROG Pin Current................................................ 800µA

Maximum Junction Temperature .......................... 125°C

Operating 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

LTC4054ES5-4.2
LTC4054XES5-4.2

S5 PART MARKING

T

= 150°C, (θJA = 100°C/ W TO

JMAX

150°C/W DEPENDING ON PC BOARD LAYOUT)

Consult LTC Marketing for parts specified with wider operating temperature ranges.

(N0TE 4)

LTH7
LTADY

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

CC

I

CC

V

FLOAT

I

BAT

I

TRIKL

V

TRIKL

V

TRHYS

V

UV

V

UVHYS

V

MSD

V

ASD

I

TERM

V

PROG

I

CHRG

V

CHRG

∆V

RECHRG

Input Supply Voltage ● 4.25 6.5 V
Input Supply Current Charge Mode (Note 3), R

Standby Mode (Charge Terminated)
Shutdown Mode (R

< V

V

CC

BAT

Regulated Output (Float) Voltage 0°C ≤ TA ≤ 85°C, I
BAT Pin Current R

Trickle Charge Current V
Trickle Charge Threshold R
Trickle Charge Hysteresis R
VCC Undervoltage Lockout Threshold From VCC Low to High ● 3.7 3.8 3.92 V
VCC Undervoltage Lockout Hysteresis ● 150 250 300 mV
Manual Shutdown Threshold PROG Pin Rising ● 1.15 1.21 1.30 V

VCC – V

C/10 Termination Current Threshold R

PROG Pin Voltage R
CHRG Pin Weak Pull-Down Current V
CHRG Pin Output Low Voltage I
Recharge Battery Threshold V

Lockout Threshold VCC from Low to High 70 100 140 mV

BAT

= 10k, Current Mode ● 93 100 107 mA

PROG

R

= 2k, Current Mode ● 465 500 535 mA

PROG

Standby Mode, V
Shutdown Mode (R
Sleep Mode, V

< 2.9V, R

BAT

= 2k, V

PROG

= 2k (Note 6) 60 80 110 mV

PROG

PROG Pin Falling

V

from High to Low 5 30 50 mV

CC

= 10k (Note 5) ● 0.085 0.10 0.115 mA/mA

PROG

= 2k ● 0.085 0.10 0.115 mA/mA

R

PROG

= 10k, Current Mode ● 0.93 1.0 1.07 V

PROG

= 5V 8 20 35 µA

CHRG

= 5mA 0.35 0.6 V

CHRG

- V

FLOAT

RECHRG

PROG

, or VCC < VUV)

BAT

= 4.2V ● 0 –2.5 –6 µA

BAT

PROG

= 0V ±1 ±2 µA

CC

= 2k (Note 6) ● 20 45 70 mA

PROG

Rising (Note 6) 2.8 2.9 3.0 V

BAT

= 2k ● 1200 2000 µA

PROG

Not Connected, ● 25 50 µA

= 40mA 4.158 4.2 4.242 V

Not Connected) ±1 ±2 µA

● 200 500 µA

● 0.9 1.0 1.1 V

100 150 200 mV

2

405442i

LTC4054-4.2/LTC4054X-4.2

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

T

LIM

R

ON

t

SS

t

RECHARGE

t

TERM

I

PROG

Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.

Note 2: The LTC4054E-4.2 and the LTC4054XE-4.2 are guaranteed to meet
performance specifications from 0°C to 70°C. Specifications over the
–40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls.

Junction Temperature in Constant 120 °C
Temperature Mode

Power FET “ON” Resistance Current Mode 600 mΩ
(Between V

Soft-Start Time I
Recharge Comparator Filter Time V
Termination Comparator Filter Time I
PROG Pin Pull-Up Current 3 µA

U

and BAT)

CC

UU

BAT

BAT

BAT

The ● denotes specifications which apply over the full operating

= 0 to I

High to Low 0.75 2 ms

Falling 400 1000 µs

=1000V/R

BAT

PROG

Note 3: Supply current includes PROG pin current but does not include
any current delivered to the battery through the BAT pin.

Note 4: See Thermal Considerations.
Note 5: I

with indicated PROG resistor.
Note 6: This parameter is not applicable to the LTC4054X.

is expressed as a fraction of measured full charge current

TERM

100 µs

PI FU 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 of approximately 20µA is
connected to the CHRG pin, indicating an “AC present”
condition. When the LTC4054 detects an undervoltage
lockout condition, CHRG is forced to a high impedance
state.

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

LTC4054 enters shutdown mode, dropping I

BAT

to less

than 2µA.
PROG (Pin 5): Charge Current Program, Charge Current

Monitor and Shutdown Pin. The charge current is pro­grammed by connecting a 1% resistor, R

, to ground.

PROG

When charging 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:

I

BAT

= (V

PROG/RPROG

) • 1000

The PROG pin can also be used to shut down the charger.
Disconnecting the program resistor from ground allows
a 3µA current to pull the PROG pin high. When it reaches
the 1.21V shutdown threshold voltage, the charger enters
shutdown mode, charging stops and the input supply
current drops to 25µA. This pin is also clamped to
approximately 2.4V. Driving this pin to voltages beyond
the clamp voltage will draw currents as high as 1.5mA.
Reconnecting R

to ground will return the charger to

PROG

normal operation.

405442i

3

LTC4054-4.2/LTC4054X-4.2

W

BLOCK DIAGRA

120°C

T

A

T

DIE

CA

+

–

4

V

CC

1× 1000×

–

+

MA

5µA

+

VA

–

REF

1.21V

–

BAT

3

R1

R2

SHDN

CHRG

1

STANDBY

TRICKLE CHARGE

DISABLED ON

LTC4054X

C3

–

2.9V TO BAT

C1

+

+

C2

R3

1V

R4

0.1V

R5

–

V

CC

3µA

+

PROG

5

R

PROG

GND

405442 BD

2

4

405442i