MAX1908 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX1908 Datasheet PDF : 30 Pages
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MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(VDCIN = VCSSP = VCSSN = 18V, VBATT = VCSIP = VCSIN = 12V, VREFIN = 3V, VVCTL = VICTL = 0.75 x VREFIN, CELLS = open, CLS =
REF, VBST - VLX = 4.5V, ACIN = GND = PGND = 0, CLDO = 1µF, LDO = DLOV, CREF = 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
TRIP POINTS
BATT Power-Fail Threshold
SYMBOL
CONDITIONS
VDCIN falling, referred to VCSIN
(MAX1908/MAX8724 only)
VCSSP falling, referred to VCSIN
(MAX8765/MAX8765A only)
MIN TYP MAX UNITS
50
100 150
mV
50
100 150
BATT Power-Fail Threshold
Hysteresis
ACIN Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
SWITCHING REGULATOR
DHI Off-Time
DHI Minimum Off-Time
DHI Maximum On-Time
DLOV Supply Current
BST Supply Current
BST Input Quiescent Current
LX Input Bias Current
LX Input Quiescent Current
DHI Maximum Duty Cycle
Minimum Discontinuous-Mode
Ripple Current
ACIN rising (MAX8765/MAX8765A only)
ACIN rising (MAX1908/MAX8724 only)
0.5% of REF
VACIN = 2.048V
VBATT = 16V, VDCIN = 19V,
VCELLS = VREFIN
VBATT = 16V, VDCIN = 17V,
VCELLS = VREFIN
DLO low
DHI high
VDCIN = 0V, VBST = 24.5V,
VBATT = VLX = 20V
VDCIN = 28V, VBATT = VLX = 20V
VDCIN = 0V, VBATT = VLX = 20V
200
mV
2.028 2.048 2.068
V
2.007 2.048 2.089
20
mV
-1
+1
µA
0.36
0.4
0.44
µs
0.24 0.28 0.33
µs
2.5
5
7.5
ms
5
10
µA
6
15
µA
0.3
1
µA
150 500
µA
0.3
1
µA
99
99.9
%
0.5
A
Battery Undervoltage Charge
Current
Battery Undervoltage Current
Threshold
DHI On-Resistance High
DHI On-Resistance Low
DLO On-Resistance High
DLO On-Resistance Low
VBATT = 3V per cell (RS2 = 15mΩ),
MAX1908 only, VBATT rising
150 300 450
mA
CELLS = GND, MAX1908 only, VBATT rising
6.1
6.2
6.3
CELLS = open, MAX1908 only, VBATT rising
9.15
9.3
9.45
V
CELLS = VREFIN, MAX1908 only, VBATT rising 12.2 12.4 12.6
VBST - VLX = 4.5V, IDHI = +100mA
4
7
Ω
VBST - VLX = 4.5V, IDHI = -100mA
1
3.5
Ω
VDLOV = 4.5V, IDLO = +100mA
VDLOV = 4.5V, IDLO = -100mA
4
7
Ω
1
3.5
Ω
Maxim Integrated
5
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