STMicroelectronics STC4054GR Schematic [ru]

Battery charger with thermal regulation

Feature summary

■ Programmable charge current up to 800mA

■ No external MOSFET, sense resistors or

blocking diode required

■ 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

■ Automatic recharge

■ Single charge status output pin

■ Charge current monitor output for gas gauging

■ C/10 Charge termination

■ 25µA supply current in shutdown mode

■ Low battery voltage detect for precharge

setting

■ Soft-start limits inrush current

■ TSOT23-5L package

Applications

■ Cellular telephones

■ PDAs

■ Bluetooth applications

■ Battery-powered devices

Description

The STC4054 is a constant current/constant
voltage charger for single cell Li-Ion batteries. No
external sense resistor or blocking diode is

STC4054

800mA Standalone linear Li-Ion

TSOT23-5L

required and its ThinSOT package make it ideally
suited for portable applications.

The STC4054 is designed to work within USB
power specifications. An internal block regulates
the current when the junction temperature
increases, in order to protect the device when it
operates in high power or high ambient
temperature.

The charge voltage is fixed at 4.2V, and the
charge current limitation can be programmed
using a single resistor connectd between PROG
pin and GND. The charge cycle is automatically
terminated when the current flowing to the battery
is 1/10 of the programmed value. If the external
adaptor is removed, the STC4054 turns off and a
2µA current can flow from the battery to the
device. The device can be put into Shutdown
Mode, reducing the supply current to 25µA. The
device also has a charge current monitor, under
voltage lockout, automatic recharge. The device is
packaged in TSOT23-5L.

Order code

Part number Package Packaging

STC4054GR TSOT23-5L 3000 parts per reel

September 2006 Rev. 1 1/17

www.st.com

17

STC4054

Contents

1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.1 Charge cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.2 V

6.3 Power ON pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.4 CHRG pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.5 PROG pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.6 Programming charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.7 BAT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.8 Charge termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.9 Automatic recharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.10 Soft start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6.11 Thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6.12 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6.13 Stability considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

CC

7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2/17

STC4054 Block diagram

1 Block diagram

Figure 1. Block diagram

3/17

Pin configuration STC4054

2 Pin configuration

Figure 2. Pin connections (top view)

Table 1. Pin description

Pln N° Symbol Note

1 CHRG

2 GND Ground pin

3BAT

4V

5 PROG Charge current program. Charge Current monitor and Shutdown pin

CC

Open Drain. This pin goes in low impedance when the STC4054 is in precharge or
charge mode

This pin provides an accurate 4.2V output voltage and the charge current to the battery.
Only 2µA reverse current can flow in to the device when in Shutdown mode

Input Supply voltage. The input range is from 4.25V to 6.5V. If VCC<V
device enters Shutdown mode and the sinked I

is less than 2µA

BAT

Figure 3. Application circuit

+30mV the

BAT

4/17

STC4054 Maximum ratings

3 Maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V

V

V

PROG

V

CHRG

I

BAT

I

PROG

CC

BAT

Input supply voltage From -0.3 to 10 V

BAT pin voltage From -0.3 to 7 V

PROG pin voltage From -0.3 to VCC+0.3 V

CHRG pin voltage From -0.3 to 7 V

BAT pin current 800 mA

PROG pin current 800 µA

BAT short circuit duration Continuous

T

T

P

D

T

J

STG

OP

Power dissipation Internally Limited mW

Max junction temperature 125 °C

Storage temperature range -65 to 125 °C

Operating junction temperature range -40 to 85 °C

Table 3. Thermal Data

Symbol Parameter Value Unit

R

R

thJC

thJA

Thermal resistance junction-case 81 °C/W

Thermal resistance junction-ambient 255 °C/W

5/17

Electrical characteristics STC4054

4 Electrical characteristics

Table 4. Electrical characteristics

(V

= 5V, CI = 1µF, TJ = -40 to 85° unless otherwise specified) (

CC

Symbol Parameter Test Min. Typ. Max. Unit

Note 1

).

V

V

V

V

I

I

BAT

I

PRE

V

MSD

CC

CC

BAT

PRE

UV

Supply voltage 4.25 6.5 V

Charge mode, R

= 3.5V

V

BAT

PROG

=10KΩ,

150 500

Standby mode (charge terminated) 150 300

Supply current (

Termination output voltage V

BAT pin current

Pre-charge current V

Pre-charge threshold

VCC Undervoltage lockout

Note 2

)

Shutdown mode

CC

Current mode R

Current mode R

Standby mode V

Shutdown mode (R
connected), T

Sleep mode, V

BAT

R

PROG

Hysteresis R

V

CC

Hysteresis R

= 4.3V to 6.5V, R

PROG

PROG

BAT

=25°C

J

=0V, TJ=25°C ±1 ±2µA

CC

<2.8V R

=10KΩ V

=2KΩ TJ=25°C 20 45 70 mA

PROG

BAT

=10KΩ 70 100 130 mV

PROG

Low to High R

=10KΩ 50 180 300 mV

PROG

not

R

PROG

connected

< V

V

CC

BAT

V

< V

CC

UV

=10KΩ 4.158 4.2 4.242 V

PROG

21 40

17 50

17 40

=10KΩ 90 100 110 mA

=2KΩ 465 500 535 mA

=4.2V 0 -2.5 -6 µA

not

PROG

±1 ±2µA

falling 2.8 2.9 3.0 V

=10KΩ 3.7 3.8 3.9 V

PROG

µA

PROG Pin Rising 1.15 1.21 1.30

Manual shutdown threshold

PROG Pin Falling 0.85 0.95 1.05

V

∆V

6/17

V

ASD

I

TERM

V

PROG

I

CHRG

V

CHRG

RECHRG

Low to High TJ=25°C

V

CC

=10KΩ

R

VCC-V

Lockout threshold

BAT

C/10 Termination current
threshold (I

Note 3

)

(

BAT/IBATC10

)

PROG

V

High to Low TJ=25°C

CC

=10KΩ

R

PROG

R

=10KΩ 0.1

PROG

R

=2KΩ 0.1

PROG

PROG pin voltage Current Mode R

CHRG Pin current weak
pull-down

CHRG Pin pull-down
voltage

Recharger battery threshold
voltage

V

=5V, V

CHRG

R

PROG

I

CHRG

V

FLOAT-VRECHRG

R

PROG

BAT

=10KΩ

=5mA 0.35 0.6 V

=10KΩ

50 85 120

53050

=10KΩ 0.93 1.0 1.07 V

PROG

=4.3V,

, TJ=25°C

82035µA

200 mV

mV

mA/mA