STBC02
Li-Ion linear battery charger with LDO,
load switches and reset generator
Datasheet - production data
Applications
Smart watches and wearable devices
Fitness and medical accessories
Li-Ion and other Li-Poly battery rechargeable
equipment
Description
Features
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
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).
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.
June 2017
DocID029261 Rev 3
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www.st.com
This is information on a product in full production.
Contents
STBC02
Contents
1
2
3
4
5
6
Application schematic .................................................................... 4
Pin configuration (top through view) ............................................. 6
Maximum ratings ............................................................................. 8
Electrical characteristics ................................................................ 9
Typical performance characteristics ........................................... 13
Functional pin description ............................................................ 17
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
6.12
6.13
GND, AGND .................................................................................... 17
NTC ................................................................................................. 17
ISET and IPRE ................................................................................ 17
BATMS ............................................................................................ 17
BATSNS, BATSNSFV ..................................................................... 18
BAT ................................................................................................. 18
IN .................................................................................................... 18
SYS ................................................................................................. 18
LDO ................................................................................................. 19
WAKE-UP ....................................................................................... 19
CHG ................................................................................................ 19
CEN ................................................................................................ 20
RESET_NOW (RESET_CLEAR), nRESET, RST_PENDING ......... 20
6.13.1
6.13.2
Smart reset section control pins ....................................................... 20
Watchdog section control pins ......................................................... 21
6.14
6.15
SW1_OA, SW1_OB, SW1_I, SW2_OA, SW2_OB, SW2_I ............. 21
SW_SEL ......................................................................................... 21
7
8
Block diagram................................................................................ 25
Operation description ................................................................... 26
8.1
8.2
8.3
8.4
8.5
8.6
8.7
Power-on ......................................................................................... 26
Battery charger................................................................................ 26
Battery temperature monitoring ....................................................... 30
Battery overcharge protection ......................................................... 30
Battery over-discharge protection ................................................... 30
Battery discharge overcurrent protection ........................................ 30
Battery fault protection .................................................................... 30
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STBC02
Contents
8.8
8.9
8.10
8.11
8.12
8.13
8.14
8.15
Floating voltage adjustment ............................................................ 31
Input overcurrent protection ............................................................ 31
SYS short-circuit protection, LDO current limitation ........................ 31
IN overvoltage protection ................................................................ 31
Shutdown mode .............................................................................. 31
Watchdog function .......................................................................... 31
Thermal shutdown ........................................................................... 31
Reverse current protection .............................................................. 32
Flip Chip30 (2.59x2.25 mm) package information ........................... 33
9
10
11
Package information ..................................................................... 33
9.1
Ordering information..................................................................... 35
Revision history ............................................................................ 36
DocID029261 Rev 3
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Application schematic
STBC02
1
Application schematic
Figure 1: STBC02 application schematic
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DocID029261 Rev 3
STBC02
Table 1: Typical bill of material (BOM)
Symbol
C
IN
C
SYS
R
ISET
R
IPRE
C
BAT
R
FLOAT
R
PUP
R
CHG
C
LDO
Notes:
(1)
R
PUP
(2)
R
CHG
Application schematic
Value
10 µF (16 V)
1 µF (10 V)
Refer to I
SET
Refer to I
PRE
4.7 µF (6.3 V)
BATSNSFV
10-100 kΩ
10 kΩ
1.0 µF (10 V)
Description
Input supply voltage capacitor
System output capacitor
Charge current programming resistor
Pre-charge current programming resistor
Battery positive terminal capacitor
Floating voltage programming resistor
nRESET pull-up resistor
(1)
Charging/fault pull-up resistor
(2)
LDO output capacitor
Note
Ceramic type
Ceramic type
Film type
Film type
Ceramic type
Film type
Film type
Film type
Ceramic type
is tied to LDO pin or to a higher voltage.
must be calculated according to the external LED electrical characteristics.
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