BC3770 Datasheet, PDF (9/45 Pages) Freescale Semiconductor, Inc – 2.0 A Switch-Mode Charger

Table 4. BC3770 Electrical Characteristics (continued)
Characteristics noted under conditions: V_VBUS = 5.0 V, V_BATREG = 3.7 V, V_VIO = 1.8 V, C_VBUS = C_PMID = 2.2 F, C_VSYS = 10 F,
C_CHGOUT = 4.7 F, C_VL = 1.0 F, L = 1.0 H, T_A = - 40 °C to 85 °C *). Typical values are at T_A = 25°C, unless otherwise noted. ⁽⁶⁾
Symbol
Characteristic
Min
Typ
Max
Unit
Notes
Battery Charger (Continued)
Stand-By Current
I_{BAT_STD}
• No VBUS, V_BATREG = 4.2 V, I_SYS = 0 mA, SHDNB = H(I²C
—
active), Q4 = On with OCP enabled, ENCOMPARATOR bit reset to
60
—
A
0, others with default
Shutdown Current
I_{BAT_SHDN}
• No VBUS, V_BATREG = 4.2 V, charger disabled, Q4 = On with
OCP disabled, SHDNB = L (I²C inactive), ENCOMPARATOR bit
—
—
20
A
reset to 0, others with default
Charger Enable Threshold
V_{CHGEN_ON}
• V_BUS - V_BATREG, rising, valid VBUS detected to enable buck &
100
150
200
charging
mV
(11)
V_{CHGEN_OFF}
• V_BUS - V_BATREG, falling, invalid VBUS detection to disable buck
0.0
50
—
& charging
V_TRICKLE
Trickle to Pre-charge Mode Change Threshold
• V_BATREG rising, 100 mV Hysteresis
2.4
2.5
2.7
V
(11)
I_TRICKLE
Trickle Charge Current
• Fixed, V_BATREG = 2.3 V, V_SYS = 3.6 V
—
90
—
mA
I_PRECHG
Pre-charge Current Programmable Range
• 450 mA default and test in production
150
—
450
mA
I_{FAST_CHG}
Fast-charge Current Programmable Range
• 500 mA default, test 500 mA, 1.0 A only in production
100
—
2000
mA
Top-off Current Programmable Range
I_TOPOFF
• I_{FAST_CHG} falling, 100 mA default, in 50 mA steps, test 100 mA
100
—
and 300 mA only in production
65
mA
V_{BAT_OVP}
Overvoltage Protection Threshold
• BATREG rising
—
V_{BAT_REG}
+ 0.1
—
V
Soft-start Slope Time
• In fast charge mode
—
1.17
—
mA/s
Minimum Output Capacitance
• On CHGOUT, For stability
-30%
4.7
—
F
(11)
Charge Current Accuracy
• Pre-charge current at 150 mA
• Top-off current at 100 mA
• I_{FAST_CHG} = 1000mA
• I_{FAST_CHG} = 2000mA
-20
—
20
-20
—
20
%
(11)
-7.0
—
7.0
-7.0
—
7.0
Thermal Protection
T_SD
Thermal Shutdown Temperature
• Temperature rising to shutdown with 20 °C hysteresis
—
150
—
°C
(11)
Thermal Regulation Threshold
T_CF
• Rising, charge current starts to reduce and the Interrupt
triggered
—
100
—
°C
Thermal Regulation Gain
• To have no charge current with respect to I_{FAST_CHG},
T_J 100 °C
—
3.33
—
%/°C
Notes
11. Guaranteed by design, characterization, and correlation with process controls. Not fully tested in production.
BC3770
9
Analog Integrated Circuit Device Data
Freescale Semiconductor