BC3770 Datasheet, PDF (10/45 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
Safety Timer
t_{PRECHG_TMR}
Pre-charge Timer
• Time for BAT from V_TRICKLE to V_{SYS_MIN}
—
45
—
Timer Accuracy
-10
—
10
t_{TOPOFF_TMR}
Top-off Timer
• Programmable
10
—
45
Fast Charge Timer
• This timer is automatically disabled when the input current limit
is set to 100 mA
t_{FAST_TMR}
FASTTIME = 00
FASTTIME = 01
—
3.5
—
—
4.5
—
FASTTIME = 10
—
5.5
—
FASTTIME = 11 (default)
—
disabled
—
Deglitch Timer ⁽¹²⁾
VBUS Supply OVP Release Deglitch Time
t_{VBUS_OVP}
• Duration VBUS stays below falling OVP before VSYS/Charger/
—
0.426
—
OTG is enabled
t_NOBAT
NOBAT Release Deglitch Time
• Duration V_NOBAT stays logic low to enable the charger
—
1.0
—
t_BATOVP
BATREG OVP Release Deglitch Time
• Duration BATREG stays below falling OVP level to enable
charger/OTG
—
7.0
—
Trickle to Pre-charge Release Deglitch Time
t_TRICKLE
• Duration BATREG stays above trickle charge level to enable
—
7.0
—
pre-charge
Pre-charge to Fast Charge Release Deglitch Time
t_PRCHG
• Duration BATREG stays above pre-charge level to enable fast
—
7.0
—
charge
Top-Off Deglitch Time
t_ITOPOFF
• Duration I_{FAST_CHG} stays below Top-off level to generate an
—
7.0
—
interrupt
t_{BAT_RECHG}
Recharge Deglitch Time
• Duration V_BATREG stays below the V_RCH Threshold
—
27
—
t_WAIT
Waiting Time to Initiate Trickle Charge Mode
• From t_{START_VSYS} expire to initiate trickle charge
—
27
—
t_{WEAK_DEB}
Weak Battery Deglitch Time
• Duration V_BATREG stays below V_{WEAK_HYS} in
ENCOMPARATOR bit = 1
—
27
—
t_{START_VSYS}
VSYS Start-up Time
• From VBUS stays above UVLO to VSYS start-up
—
220
—
t_{INT_MASK}
Interrupt Mask Time
—
10
—
Overcurrent Discharge Deglitch Time
t_ITOPOFF
• Duration I_{FAST_DISCHG} stays above the overcurrent threshold in
—
7.0
—
Discharge mode to generate an interrupt
min.
%
(12)
min.
hrs.
ms
ms
ms
ms
ms
ms
ms
ms
(12)
ms
ms
s
ms
Notes
12. Guaranteed by design, characterization, and correlation with process controls. Not fully tested in production.
Analog Integrated Circuit Device Data
Freescale Semiconductor
BC3770
10