STBC02BJR

STBC02 Datasheet Li-Ion linear battery charger with LDO, load switches and reset generator Features • • • • • • • • Maturity status link STBC02 • • • • • • • • • • Charges single-cell Li-Ion batteries with CC/CV algorithm and charge termination Fast charge current up to 450 mA Pre-charge current from 1 mA to 450 mA Adjustable floating voltage up to 4.45 V Integrated low quiescent LDO regulator Automatic power path management Auto-recharge function Embedded protection circuit module (PCM) featuring battery overcharge, battery over-discharge and battery overcurrent protections Charging timeout to terminate the charging process for safety reasons Shipping mode feature allows battery low leakage when over-discharged Very low battery leakage in over-discharge and shutdown mode Charge/fault status output Battery voltage pin to allow external gauging Two 3 Ω SPDT load switches Reset generator triggered by USB detection SWIRE allows the STBC02 functions to be controlled Available in Flip Chip 30, 0.4 mm pitch package Rugged ±4 kV HBM, ESD protection on the most critical pins Applications • • • Smart watches and wearable devices Fitness and medical accessories Li-Ion and other Li-Poly battery rechargeable equipment Description The STBC02 is a highly integrated power management, embedding a linear battery charger, a 150 mA LDO, 2 SPDT load switches, a smart reset/watchdog block and a protection circuit module (PCM) to prevent the battery from being damaged under fault conditions. The STBC02 uses a CC/CV algorithm to charge the battery; the fast charge and the pre-charge current can be both independently programmed using dedicated resistors. The termination current is set by default, being 5% of the programmed fast charge current, but it can also be fixed to different values. Likewise, the battery floating voltage value is programmable and can be set to a value up to 4.45 V. The STBC02 also features a charger enable input to stop the charging process anytime. The STBC02 is automatically powered off from the connected battery when the IN pin is not connected to a valid power source (battery mode). A battery under/overtemperature condition can be detected by using an external circuitry (NTC thermistor). DS11617 - Rev 5 - December 2022 For further information contact your local STMicroelectronics sales office. www.st.com STBC02 The STBC02 draws less than 10 nA from the connected battery in shipping mode conditions, so to maximize the battery life during end product shelf life. The device is available in the Flip Chip 30 package. DS11617 - Rev 5 page 2/35 STBC02 Application schematic 1 Application schematic Figure 1. STBC02 application schematic Table 1. Typical bill of material (BOM) Symbol Value CIN 10 µF (16 V) Input supply voltage capacitor Ceramic type CSYS 1 µF (10 V) System output capacitor Ceramic type RISET Refer to ISET Charge current programming resistor Film type RIPRE Refer to IPRE Pre-charge current programming resistor Film type CBAT 4.7 µF (6.3 V) Battery positive terminal capacitor RFLOAT BATSNSFV RPUP 10-100 kΩ RCHG 10 kΩ CLDO 1.0 µF (10 V) Description Floating voltage programming resistor nRESET pull-up resistor (1) Charging/fault pull-up resistor (2) LDO output capacitor Note Ceramic type Film type Film type Film type Ceramic type 1. RPUP is tied to LDO pin or to a higher voltage. 2. RCHG must be calculated according to the external LED electrical characteristics. DS11617 - Rev 5 page 3/35 STBC02 Pin configuration (top through view) 2 Pin configuration (top through view) Figure 2. Pin configuration top through view Table 2. Pin description Bump name Bump Power Programming Sensing Digital I/Os Digital I/Os DS11617 - Rev 5 Description IN E5-F5 Input supply voltage. Bypass this pin to ground with a 10 µF capacitor BAT A5-B5 Battery positive terminal. Bypass this pin to GND with a 4.7 µF ceramic capacitor SYS C5-D5 System output. Bypass this pin to ground with 1 µF ceramic capacitor LDO F4 LDO output. Bypass this pin to ground with 1 µF ceramic capacitor NTC D1 Battery temperature monitor pin AGND B4 Analog ground GND A3 GROUND ISET A4 Fast charge current programming resistor IPRE D4 Pre-charge current programming resistor BATMS C4 Battery voltage measurement pin BATSNS B3 Battery voltage sensing. Connect as close as possible to the battery positive terminal BATSNSFV A2 Floating voltage sensing. Connect as close as possible to the battery positive terminal CEN B1 Charger enable pin. Active high. 500 kΩ internal pull-up (to LDO) CHG E1 Charging/fault flag. Active low (open drain output) WAKE-UP D2 Shipping mode exit input pin. Active high. 50 kΩ internal pull-down SW_SEL C1 Load switch selection input (refer to LDO level) nRESET C2 Smart reset output signal (open drain output). A pull-up resistor (10 – 100 kΩ) is connected to LDO pin or to a higher voltage RST_PENDING B2 Reset output signal (totem pole output) RESET_NOW A1 Smart reset input signal (referred to LDO level); RESET_CLEAR when watchdog is enabled Connect together with the same ground layer page 4/35 STBC02 Pin configuration (top through view) Bump name Bump SW1_I F3 Load switch SPDT1 input (1.8 V to 5 V range) SW1_OA E4 Load switch SPDT1 output A (enabled/disabled by SWIRE) SW1_OB E3 SW2_I E2 SW2_OA F2 Load switch SPDT2 output A (enabled/disabled by SWIRE) SW2_OB F1 Load switch SPDT2 output B (enabled/disabled by SWIRE) NC C3-D3 Switch matrix - DS11617 - Rev 5 Description If SPDT switches are used, decoupling capacitors are recommended on input and output. Capacitor values depend on application Load switch SPDT2 input (1.8 V conditions and requirements. to 5 V range) If not used, connect inputs and outputs to GND Load switch SPDT1 output B (enabled/disabled by SWIRE) Not connected Leave floating page 5/35 STBC02 Maximum ratings 3 Maximum ratings Table 3. Absolute maximum ratings Note: Symbol Parameter Test conditions Value Unit VIN Input supply voltage pin DC voltage -0.3 to +16.0 V VLDO LDO output pin voltage DC voltage -0.3 to +4.0 V VSYS SYS pin voltage DC voltage -0.3 to +6.5 V VSW Switch pin voltage (SW1_I, SW2_I, SW1_OA,SW1_OB, SW2_OA, SW2_OB) DC voltage -0.3 to +6.5 V VCHG CHG pin voltage DC voltage -0.3 to +6.5 V VWake-up WAKE-UP pin voltage DC voltage -0.3 to +4.6 V VLGC Voltage on logic pins (CEN, SW_SEL, RESET_NOW, nRESET, RST_PENDING) DC voltage -0.3 to +4.0 V VISET, VIPRE Voltage on ISET, IPRE pins DC voltage -0.3 to +2 V VNTC Voltage on NTC pin DC voltage -0.3 to VLDO V VBAT, VBATSNS, VBATSNSFV Voltage on BAT, BATSNS and BATSNSFV pins DC voltage -0.3 to +5.5 V VBATMS Voltage on BATMS pin DC voltage -0.3 to VBAT+0.3 V ESD Human body model (IN, SYS, WAKE-UP, LDO, BAT, BATSNS, BATSNSFV) JS-001-2012 vs. AGND PGND and GND ±4000 V Human body model (all the others) JS-001-2012 ±2000 V TAMB Operating ambient temperature -40 to +85 °C TJ Maximum junction temperature +125 °C TSTG Storage temperature -65 to +150 °C Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Table 4. Thermal data Symbol RTHJB (1) Parameter Junction-to-pcb board thermal resistance Flip Chip 30 (2.25 x 2.59 mm) 50 Unit °C/W 1. Standard FR4 pcb board. DS11617 - Rev 5 page 6/35 STBC02 Electrical characteristics 4 Electrical characteristics VIN = 5 V, VBAT = 3.6 V, CLDO = 1 µF, CBATT = 4.7 µF, CIN = 10 µF, CSYS = 1 µF, RISET = 1 kΩ, SD = low, CEN = high, RIPRE = 4.7 kΩ, TA = 25 °C, SW_SEL = GND or LDO, RESET_NOW = GND or LDO, WAKE-UP floating unless otherwise specified. Table 5. Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit VFLOAT set 4.2 V, IFAST < 250 mA 4.55 5.4 V Operating input voltage VFLOAT set 4.45 V, IFAST < 450 mA, ISYS=ILDO=0 mA 4.75 5.4 (1) V VINOVP Input overvoltage protection VIN rising 5.6 6.4 V VINOVPH Input overvoltage protection hysteresis VIN falling 200 mV VUVLO Undervoltage lock-out VIN falling 3.9 V VUVLOH Undervoltage lock-out hysteresis VIN rising 300 mV Charger disabled mode (CEN = low), ISYS=ILDO=0 A 600 μA Charging, VHOT < VNTC < VCOLD, including RISET current 1.4 mA VIN IIN VFLOAT IBAT IFAST IN supply current Battery floating voltage BAT pin supply current Fast charge current IBAT=1 mA, BATSNS and BATSNSFV short to battery terminal 4.179 6.0 4.2 4.221 V Battery-powered mode (VIN