BQ24600_1 Datasheet, PDF (6/31 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger with Low Iq

bq24600
SLUS891 – FEBRUARY 2010
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
5.0V ≤ V(VCC) ≤ 28V, 0°C < T_J < +125°C, typical values are at T_A = 25°C, with respect to GND (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP
MAX UNIT
REGN REGULATOR
V_{REGN_REG}
REGN regulator voltage
I_{REGN_LIM}
REGN current limit
SAFETY TIMER
T_PRECHG
T_CHARGE
Precharge safety timer range⁽¹⁾
Internal five hour safety timer⁽¹⁾
BATTERY DETECTION
V_VCC > 10 V, CE = HIGH (0 - 40 mA load)
V_REGN = 0 V, V_VCC > V_UVLO
Precharge time before fault occurs
5.7
6.0
40
6.3 V
mA
1440
4.25
1800
5
2160 s
5.75 hr
t_WAKE
Wake timer
I_WAKE
Wake current
t_DISCHARGE
Discharge timer
I_DISCHARGE
Discharge current
I_FAULT
Fault current after a timeout fault
V_WAKE
Wake threshold ( w.r.t. V_REG)
V_DISCH
Discharge threshold
PWM HIGH SIDE DRIVER (HIDRV)
Max time charge is enabled
R_SENSE = 10 mΩ
Max time discharge current is applied
Voltage on VFB to detect battery absent during wake
Voltage on VFB to detect battery absent during discharge
500
50
125
1
8
2
50
1.55
ms
200 mA
sec
mA
mA
mV
V
R_{DS_HI_ON}
High side driver (HSD) turn-on
resistance
V_BTST – V_PH = 5.5 V
3.3
6Ω
R_{DS_HI_OFF}
V_{BTST_REFRESH}
High side driver turn-off resistance
Bootstrap refresh comparator threshold
voltage
V_BTST – V_PH = 5.5 V
V_BTST – V_PH when low side refresh pulse is requested
1
4.0
4.2
1.3 Ω
V
PWM LOW SIDE DRIVER (LODRV)
R_{DS_LO_ON}
Low side driver (LSD) turn-on resistance
R_{DS_LO_OFF}
Low side driver turn-off resistance
PWM DRIVERS TIMING
4.1
7Ω
1
1.4 Ω
Driver dead time
Dead time when switching between LSD and HSD, no
load at LSD and HSD
30
ns
PWM OSCILLATOR
V_{RAMP_HEIGHT}
PWM ramp height
PWM switching frequency⁽¹⁾
As percentage of VCC
1020
7%
1200
1380 kHz
INTERNAL SOFT START (8 steps to regulation current I_CHARGE)
Soft Start Steps
8
step
Soft Start Step Time
1.6
ms
CHARGER SECTION POWER-UP SEQUENCING
Charge-enable delay after power-up
Delay from when CE = 1 to when the charger is allowed to
turn on
1.5
s
LOGIC IO PIN CHARACTERISTICS (CE, STAT, PG)
V_{IN_LO}
CE input low threshold voltage
V_{IN_HI}
CE input high threshold voltage
2.1
V_{BIAS_CE}
CE input bias current
V = 3.3V (CE has internal 1MΩ pulldown resistor)
V_{OUT_LO}
STAT, PG output low saturation voltage Sink current = 5 mA
I_{OUT_HI}
Leakage current
V = 32 V
0.8 V
6 mA
0.5 V
1.2 µA
(1) Verified by design.
6
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