BQ24040 Datasheet, PDF (4/31 Pages) Texas Instruments – 800mA Single-Input Single Cell Li-Ion Battery Charger With Auto Start

bq24040
bq24041
SLUS941A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009.................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Over junction temperature range 0°C ≤ T_J ≤ 125°C and recommended supply voltage (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
BATTERY SHORT PROTECTION
V_OUT(SC)
OUT pin short-circuit detection
threshold/ precharge threshold
Vout:3V → 0.5V, no deglitch
0.75
0.8
V_OUT(SC-HYS) OUT pin Short hysteresis
Recovery ≥ V_OUT(SC) + V_OUT(SC-HYS); Rising, no
Deglitch
77
I_OUT(SC)
Source current to OUT pin during
short-circuit detection
10
15
QUIESCENT CURRENT
I_OUT(PDWN)
Battery current into OUT pin
V_IN = 0V
I_OUT(DONE)
OUT pin current, charging terminated V_IN = 6V, V_OUT > V_OUT(REG)
I_IN(STDBY)
Standby current into IN pin
TS = LO, V_IN ≤ 6V
I_CC
Active supply current, IN pin
TS = open, V_IN = 6V, TTDM – no load on OUT
pin, V_OUT > V_OUT(REG), IC enabled
0.8
BATTERY CHARGER FAST-CHARGE
V_OUT(REG)
Battery regulation voltage
V_IN =5.5V, I_OUT =25mA, (V_TS-45°C≤ V_TS ≤ V_TS-0°C,
bq24040)
4.16
4.2
V_{O_HT(REG)}
Battery hot regulation Voltage,
bq24040
V_IN =5.5V, I_OUT =25mA, V_TS-60°C≤ V_TS ≤ V_TS-45°C
4.02
4.06
I_OUT(RANGE)
Programmed Output “fast charge”
current range
V_OUT(REG) > V_OUT > V_LOWV; V_IN = 5V, ISET2=Lo,
R_ISET = 675 to 10.8kΩ
10
Adjust VIN down until I_OUT = 0.5A, V_OUT = 4.15V,
V_DO(IN-OUT)
Drop-Out, VIN – VOUT
R_ISET = 675 , ISET2=Lo (adaptor mode); Tj ≤
325
100°C
I_OUT
Output “fast charge” formula
V_OUT(REG) > V_OUT > V_LOWV; V_IN = 5V, ISET2=Lo
R_ISET = K_ISET /I_OUT; 50 < IOUT < 800 mA
K_ISET
Fast charge current factor
R_ISET = K_ISET /I_OUT; 25 < IOUT < 50 mA
R_ISET = K_ISET /I_OUT; 10 < IOUT < 25 mA
PRECHARGE – SET BY PRETERM PIN: bq24040; Internally Set: bq24041
K_ISET/R_ISET
510
540
480
527
350
520
V_LOWV
Pre-charge to fast-charge transition
threshold
2.4
2.5
t_DGL1(LOWV)
Deglitch time on pre-charge to
fast-charge transition
70
t_DGL2(LOWV)
Deglitch time on fast-charge to
pre-charge transition
32
I_PRE-TERM
Refer to the Termination Section
%_PRECHG
Pre-charge current, default setting
Pre-charge current formula
V_OUT < V_LOWV; R_ISET = 1080Ω; bq24040:
R_PRE-TERM= High Z; bq24041: Internally Fixed
R_PRE-TERM = K_PRE-CHG (Ω/%) × %_PRE-CHG (%)
K_PRE-CHG
% Pre-charge Factor
V_OUT < V_LOWV, V_IN = 5V, R_PRE-TERM = 2k to 10kΩ;
R_ISET = 1080Ω , R_PRE-TERM = K_PRE-CHG ×
%I_FAST-CHG, where %I_FAST-CHG is 20 to 100%
V_OUT < V_LOWV, V_IN = 5V, R_PRE-TERM = 1k to 2kΩ;
R_ISET = 1080Ω, R_PRE-TERM = K_PRE-CHG ×
%I_FAST-CHG, where %I_FAST-CHG is 10% to 20%
TERMINATION – SET BY PRE-TERM PIN: bq24040; Internally Set: bq24041
18
20
R_PRE-TERM/K_PRE-CHG%
90
100
84
100
%_TERM
Termination Threshold Current, default V_OUT > V_RCH; R_ISET = 1k; bq24040: R_PRE-TERM=
setting
High Z ; bq24041: Internally Fixed
Termination Current Threshold
Formula, bq24040
R_PRE-TERM = K_TERM (Ω/%) × %TERM (%)
9
10
R_PRE-TERM/ K_TERM
K_TERM
% Term Factor
V_OUT > V_RCH, V_IN = 5V, R_PRE-TERM = 2k to 10kΩ ;
R_ISET = 750Ω K_TERM × %I_FAST-CHG, where
182
200
%I_FAST-CHG is 10 to 50%
V_OUT > V_RCH, V_IN = 5V, R_PRE-TERM = 1k to 2kΩ ;
R_ISET = 750Ω K_TERM × %Iset, where %Iset is 5 to
174
199
10%
I_PRE-TERM
Current for programming the term. and
pre-chg with resistor. I_Term-Start is the
initial PRE-TERM curent.
R_PRE-TERM = 2k, V_OUT = 4.15V
71
75
MAX UNIT
0.85 V
mV
20 mA
1
μA
6
125 μA
1 mA
4.23 V
4.1 V
800 mA
500 mV
A
570
600 AΩ
680
2.6 V
μs
ms
22 ^%IOUT-
CC
110 Ω/%
117 Ω/%
11 ^%IOUT-
CC
216
Ω/%
224
81 μA
4
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