Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsPMICsPMIC - battery management Charge management Li-Ion DFN 6 (3x3) Surface-mount

September 2006 Rev. 1 1/17

STBC08

800mA 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

■ Complete linear charger for single cell lithium-

ion batteries

■ Constant current / constant voltage operation

with thermal regulation to maximize charge

rate without risk of overheating

■ Two charge status output pins

■ Charges single cell li-ion batteries directly from

USB port

■ Preset 4.2V charge voltage with 1% accuracy

■ Charge current monitor for gas gauging

■ Automatic recharge

■ Under-voltage lockout

■ C/10 Charge termination

■ 25µA supply current in shutdown mode

■ Low battery voltage detect for precharge

setting

■ Soft-start feature limits inrush current

■ DFN6 (3x3mm) package (for better power

dissipation)

Applications

■ Cellular telephones

■ PDAs

■ Bluetooth applications

■ Battery-powered devices

Description

The STBC08 is a constant current/constant

voltage charger for single cell Li-Ion batteries. No

external sense resistor or blocking diode is

required.

The STBC08 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 conditions.

The charge voltage is fixed at 4.2V, and current

limitation can be programmed using a single

resistor connected 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 STBC08 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 charge termination and

input voltage presence are indicated by two

separate status pins.

DFN6 (3x3mm)

www.st.com

Order code

Part number Package Packaging

STBC08PMR QFN6 (3mm x 3mm) 4500 parts per reel

Summary of content (17 pages)

PAGE 1
STBC08 800mA 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 ■ Complete linear charger for single cell lithiumion batteries ■ Constant current / constant voltage operation with thermal regulation to maximize charge rate without risk of overheating ■ Two charge status output pins ■ Charges single cell li-ion batteries directly from USB port ■ Preset 4.
PAGE 2
STBC08 Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical performance characteristics . . . . . . . . .
PAGE 3
STBC08 Block diagram 1 Block diagram Figure 1.
PAGE 4
Pin configuration STBC08 2 Pin configuration Figure 2. Pin connections (top view) Table 1. Pin description Pln N° Symbol 1 BAT 2 CHRG 4 GND 5 PROG 6 VCC 4/17 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 Open Drain. When the STBC08 detects an undervoltage lockout condition or when the POWER ON external adaptor provide an input voltage higher than 7.
PAGE 5
STBC08 Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit From -0.3 to 10 V BAT pin voltage From -0.3 to VCC+0.3 V VPROG PROG pin voltage From -0.3 to VCC+0.3 V VCHRG CHRG pin voltage From -0.3 to 7 V POWER ON pin voltage From -0.
PAGE 6
Electrical characteristics STBC08 4 Electrical characteristics Table 4. Electrical characteristics (VCC = 5V, CI = 1µF, TJ = -40 to 85° unless otherwise specified) (Note 2). Symbol VCC ICC Parameter Test Supply voltage IBAT BAT pin current IPRE Pre-charge current VPRE Pre-charge threshold VUV VCC Undervoltage lockout VMSD VASD Unit 6.5 V 150 500 Standby mode (charge terminated) 150 300 RPROG not connected 21 40 VCC < VBAT 17 50 VCC < VUV 17 40 4.158 4.2 4.
PAGE 7
STBC08 Table 4. Electrical characteristics Electrical characteristics (VCC = 5V, CI = 1µF, TJ = -40 to 85° unless otherwise specified) (Note 2). Symbol Parameter Test Min. Typ. Max.
PAGE 8
Typical performance characteristics STBC08 5 Typical performance characteristics Figure 4. IBAT vs Supply voltage Figure 5. VBAT vs VCC Figure 6. IBAT vs temperature Figure 7. VPROG vs temperature Figure 8. IBAT/IPROG vs temperature Figure 9. Recharge battery threshold voltage vs.
PAGE 9
STBC08 Typical performance characteristics Figure 10. IBAT/IPROG vs VCC Figure 11. IBAT vs VBAT Figure 12. VCHRG vs temperature (CHRG pin output low voltage) Figure 13. IBAT vs VPROG Figure 14.
PAGE 10
Application information 6 STBC08 Application information The STBC08 uses an internal P-Channel MOSFET to work in constant current and constant voltage method. It is able to provide up to 800mA with a final regulated output voltage of 4.2V ± 1% in full temperature range. No blocking diode and sensing resistor are required. It is also possible to use an USB port as power supply voltage. 6.
PAGE 11
STBC08 Application information -00 is Precharge Mode (Trickle charge mode) or Charge Mode. VCC is higher than VUVLO and RPROG is connected to the PROG pin. - 01 is STANBY MODE (charge completed) or SHUTDOWN MODE (RPROG not connected). - 11 supply is not sufficient. 6.5 PROG pin Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1% resistor, RPROG, to ground.
PAGE 12
Application information 6.9 STBC08 Automatic recharge The device restarts the charge cycle when the battery voltage falls below 4.05V to maintain the battery capacity value higher than 80%. During the recharge time, the CHRG pin goes low state. 6.10 Soft start When a charge cycle starts, a internal soft start circuit minimizes the inrush current. At starting phase, the charge current ramps from zero to the full scale in a 100µs period time. 6.
PAGE 13
STBC08 7 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.
PAGE 14
Package mechanical data STBC08 DFN6 (3x3) MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 0.80 0.90 1.00 0.031 0.035 0.039 A1 0 0.02 0.05 0 0.001 0.002 A3 0.20 0.008 b 0.23 0.30 0.38 0.009 0.012 0.015 D 2.90 3.00 3.10 0.114 0.118 0.122 D2 2.23 2.38 2.48 0.088 0.094 0.098 E 2.90 3.00 3.10 0.114 0.118 0.122 E2 1.50 1.65 1.75 0.059 0.065 0.069 e L 0.95 0.30 0.40 0.037 0.50 0.012 0.016 0.
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STBC08 Package mechanical data Tape & Reel QFNxx/DFNxx (3x3) MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. 330 13.2 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T MAX. 0.504 0.519 18.4 0.724 Ao 3.3 0.130 Bo 3.3 0.130 Ko 1.1 0.043 Po 4 0.157 P 8 0.
PAGE 16
Revision history STBC08 8 Revision history Table 6. Revision history Date Revision 04-Sep-2006 1 16/17 Changes Initial release.
PAGE 17
STBC08 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.