BQ24085 Datasheet, PDF (4/34 Pages) Texas Instruments – 750 mA SINGLE-CHIP Li-Ion/Li-Pol CHARGE MANAGEMENT IC WITH THERMAL REGULATION

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SLUS784B – DECEMBER 2007 – REVISED MAY 2008 .................................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS (Continued)
over recommended operating, T_J = 0°C–125°C range, See the Application Circuits section, typical values at T_J = 25°C (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
VOLTAGE REGULATION, V_(IN) ≥ V_O(REG) + V_(DO-MAX), I_(TERM) < I_(OUT) < I_O(OUT), CHARGER ENABLED, NO FAULT CONDITIONS
DETECTED
V_O(REG)
V_O(TOL)
Output voltage
Voltage regulation accuracy
T_A = 25°C
4.20
V
–0.5%
0.5%
–1%
1%
V_(DO)
Dropout voltage, V(IN) – V(OUT) I_(OUT) = 750 mA
600 mV
CURRENT REGULATION , V_(IN) > V_(OUT) > V_(DO-MAX), CHARGER ENABLED, NO FAULT CONDITIONS DETECTED
I_O(OUT)
Output current range
V_(BAT) > V_(LOWV), I_O(OUT) = I_(OUT) = K_(SET) ×
V_(SET)/R_(SET)
50
750 mA
V_(SET)
Output current set voltage
V_(ISET) = V_(SET), V_(LOWV) < V_(BAT) ≤ V_O(REG)
2.45 2.5 2.55 V
K_(SET)
Output current set factor
100 mA ≤ I_O(OUT) ≤ 750 mA
10 mA ≤ I_O(OUT) < 100 mA
mA kW
Volts
175 182 190
180 215 250
R_ISET
External resistor range
Resistor connected to ISET pin
0.6
10 kΩ
VOLTAGE AND CURRENT REGULATION TIMING, V_(IN) > V_(OUT) + V_(DO-MAX), CHARGER ENABLED, NO FAULT CONDITIONS
DETECTED, R_TMR = 50K or V(TMR) = OPEN; Thermal regulation loop not active
t_PWRUP(CHG)
Input power detection to full
charge current time delay
Measured from PG:HI → LO to I_(OUT) > 100 mA,
CE = LO, I_O(OUT) = 750 mA, V(BAT) = 3.5 V
25
ms
t_PWRUP(EN)
Charge enable to full charge
current delay
Measured from CE:HI → LO to I_(OUT) >100 mA,
I_O(OUT) = 750 mA, V_(BAT)= 3.5 V, V_(IN) = 4.5 V, Input
power detected
25
ms
t_PWRUP(LDO)
Input power detection to voltage
regulation delay, LDO mode set,
no battery or load connected
Measured from PG:HI → LO to V_(OUT) > 90% of
charge voltage regulation;
V_(TMR) = OPEN, LDO mode set, no battery and no
load at OUT pin, CE = LO
25
ms
PRECHARGE AND OUTPUT SHORT-CIRCUIT CURRENT REGULATION, V(IN)–V(OUT) > V(DO-MAX) , V(IN) ≥ 4.5V, CHARGER
ENABLED, NO FAULT CONDITIONS DETECTED, RTMR = 50K or V(TMR)=OPEN; Thermal regulation loop not active
V_(LOWV)
Precharge to fast-charge
transition threshold
V_(BAT) increasing
2.8 2.95 3.15 V
V_(SC)
Precharge to short-circuit
transition threshold
V_(BAT) decreasing
1.2 1.4 1.6
V
V_(SCIND)
Short-circuit indication
V_(BAT) decreasing
1.6 1.8
2
I_O(PRECHG)
Precharge current range
V_(SC) < V_I(BAT) < V_(LOWV), t < t_(PRECHG)
I_O(PRECHG) = K_(SET) × V_(PRECHG)/R_(ISET)
5
75 mA
V_(PRECHG)
Precharge set voltage
V_(ISET) = V_(PRECHG), V_(SC) < V_I(BAT) < V_(LOWV),
t < t_(PRECHG)
225 250 280 mV
I_O(SHORT)
Output shorted regulation current
V_SS ≤ V_(BAT) ≤ V_(SCI),
I_O(SHORT) = I_(OUT), V_(BAT)=
VSS, Internal pullup resistor,
T_J = 25°C
V_POR < V_IN < 6.0 V
6.0 V < V_IN < V_OVP
7
15
24
mA
15
TEMPERATURE REGULATION (Thermal regulation™), CHARGER ENABLED, NO FAULT CONDITIONS DETECTED
T_J(REG)
Temperature regulation limit
V_(IN) = 5.5 V, V(BAT) = 3.2 V, Fast charge current
set to 1A
101 112 125 °C
I_{(MIN_TJ(REG))}
Minimum current in thermal
regulation
V_(LOWV) < V(BAT) < VO(REG),
0.7kΩ < R_(ISET) < 1.18kΩ
105 125 mA
4
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