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STC4054GR
800mA STANDALONE LINEAR Li-Ion Battery charger with therminal regulation
September 2006 Rev. 1 1/17
STC4054800mA Standalone linear Li-Ion
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
DescriptionThe STC4054 is a constant current/constant
voltage charger for single cell Li-Ion batteries. No
external sense resistor or blocking diode is
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
STC40542/17
Contents Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106.1 Charge cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.2 VCC Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
STC4054 Block diagram
3/17
1 Block diagram
Figure 1. Block diagram
Pin configuration STC4054
4/17 Pin configuration
Figure 2. Pin connections (top view)
Table 1. Pin description
Figure 3. Application circuit
STC4054 Maximum ratings
5/17
3 Maximum ratings
Table 2. Absolute maximum ratings
Table 3. Thermal Data
Electrical characteristics STC4054
6/17
4 Electrical characteristics
Table 4. Electrical characteristics
(VCC = 5V, CI = 1µF, TJ = -40 to 85° unless otherwise specified) (Note1).
STC4054 Electrical characteristics
7/17
Note: 1 The STC4054 was tested using a battery simulator and an output capacitor value about
4.7µF Supply current includes PROG pin current but not include any current delivered to the
battery through the VBAT pin TERM is expressed as a fraction of measured full charge current with indicated PROG
resistor Guaranteed by design
Table 4. Electrical characteristics
(VCC = 5V, CI = 1µF, TJ = -40 to 85° unless otherwise specified) (Note1).
Typical performance characteristics STC4054
8/17
5 Typical performance characteristics
STC4054 Typical performance characteristics
9/17
