Rainbow Electronics MAX1873 - Manual (Page 4)

MAX1873
Simple Current-Limited Switch-Mode
Li+ Charger Controller
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ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V DCIN = V CSSP = V CSSN = 18V, V ICHG/EN = V REF , V VADJ = V REF /2. MAX1873R: V BATT = V CSB = 8.4V;
MAX1873S: V BATT = V CSB = 12.6V; MAX1873T: V BATT = V CSB = 16.8V; T A = -40°C to +85°C. Typical values are at T A = +25°C,
unless otherwise noted.)
PARAMETER CONDITIONS MIN MAX UNITS
INPUT SUPPLY AND REFERENCE
DCIN Input Voltage Range 6 28 V
6.0V < V DCIN < 28V 7 mA
D C IN Qui escent S up p l y C ur r ent
DCIN ≤ BATT 10 µA
DCIN to BATT Undervoltage Threshold CSSP = DCIN, input falling 0.05 0.2 V
DCIN to BATT Undervoltage Threshold CSSP = DCIN, input rising 0.22 0.38 V
VL Output Voltage 6.0V < V DCIN < 28V 5.15 5.65 V
VL Output Load Regulation I VL = 0 to 3mA 50 mV
REF Output Voltage I REF = 21µA (200k Ω load) 4.179 4.221 V
6 mV
REF Line Regulation 6.0V < V DCIN < 28V
65 ppm/V
REF Load Regulation I REF = 0 to 1mA 13 mV
SWITCHING REGULATOR
PWM Oscillator Frequency 270 330 kHz
EXT Driver Source On-Resistance 7 Ω
EXT Driver Sink On-Resistance 4.5 Ω
VH Output Voltage DCIN - VH, 6V < V DCIN <28V, I VH = 0 to 20mA 4.75 5.75 V
CSSN/CSSP Input Current V
CSSN
/V
CSSP
= 28V, V
DCIN
= 28V 200 µA
CSSN/CSSP Off-State Leakage V DCIN = V SSN /V CSSP = 18V V BATT = V CSB = 18V 5 µA
ICHG/EN = 0 (charger disabled) 1
BATT, CSB Input Current
ICHG/EN = REF (charger enabled) 500
µA
BATT, CSB Input Current DCIN ≤ BATT (input power removed) 5 µA
2-cell version MAX1873R 10.45 11.55
3-cell version MAX1873S 15.675 17.325 BATT Overvoltage Cutoff Threshold
4-cell version MAX1873T (Note 1) 17.575 19.425
V
V VADJ = 0 7.898 8.018
V VADJ = V REF /2 8.337 8.463
MAX1873R
(2 Li+ cells)
V VADJ = V REF (Note 1) 8.775 8.909
V VADJ = 0 11.847 12.027
V VADJ = V REF /2 12.505 12.695
MAX1873S
(3 Li+ cells)
V VADJ = V REF (Note 1) 13.163 13.363
V VADJ = 0 15.796 16.036
V VADJ = V REF /2 16.674 16.926
Battery Regulation Voltage
MAX1873T
(4 Li+ cells)
V
VADJ
= V
REF
(Note 1) 17.551 17.817
V