MAX1870A データシートの表示（PDF） - Maxim Integrated
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MAX1870A Datasheet PDF : 32 Pages
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Step-Up/Step-Down
Li+ Battery Charger
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, VDCIN = VCSSP = VCSSN = VCSSS = VVHP = 18V, VBATT = VCSIP = VCSIN = VBLKP = 12V, VREFIN = 3.0V, VICTL =
0.75 x VREFIN, VCTL = LDO, CELLS = FLOAT, GND = PGND = 0, VDLOV = 5.4V, TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
REFERENCE
REF Output Voltage
REF Load Regulation
REF Undervoltage-Lockout Trip
Point
IREF = 0µA
0 < IREF < 500µA
VREF falling
4.076 4.096 4.116
V
5
10
mV
3.1
3.9
V
REFIN Input Range
2.5
3.6
V
REFIN UVLO Rising
REFIN UVLO Hysteresis
REFIN Input Bias Current
SWITCHING REGULATOR
VDCIN = 18V
DCIN = 0, VREFIN = 3.6V
1.9
2.2
V
50
mV
50
100
µA
-1
+1
Cycle-by-Cycle Step-Up Maximum
Current-Limit Sense Voltage
VDCIN = 12V, VBATT = 16.8V
135 150 165
mV
Cycle-by-Cycle Step-Down
Maximum Current-Limit Sense
Voltage
VDCIN = 19V, VBATT = 16.8V
135 150 165
mV
Step-Down On-Time
Minimum Step-Down Off-Time
Step-Up Off-Time
Minimum Step-Up On-Time
MOSFET DRIVERS
VHP - VHN Output Voltage
VHN Load Regulation
DHI On-Resistance High
DHI On-Resistance Low
VHP Input Bias Current
BLKP Input Bias Current
DLOV Supply Current
DBST On-Resistance High
DBST On-Resistance Low
ERROR AMPLIFIERS
GMV Amplifier Loop
Transconductance
VDCIN = 18V, VBATT = 16.8V
VDCIN = 18V, VBATT = 16.8V
VDCIN = 12V, VBATT = 16.8V
VDCIN = 12V, VBATT = 16.8V
8V < VVHP < 28V, no load
0 < IVHN < 10mA
ISOURCE = 10mA
ISINK = 10mA
DCIN = 0
VDCIN = 18V
ICTL = 0
VICTL = VREFIN = 3.3V
DBST low
ISOURCE = 10mA
ISINK = 10mA
VCTL = REFIN, VBATT = 16.8V
2.2
2.4
2.6
µs
0.15 0.4 0.50
µs
1.6
1.8
2.0
µs
0.15 0.3 0.40
µs
4.5
5
5.5
V
70
150
mV
2
5
Ω
1
3
Ω
0.1
1
µA
1.3
2
mA
0.1
2
µA
100 400
5
10
µA
2
5
Ω
1
3
Ω
0.05
0.1
0.20 µA/mV
GMI Amplifier Loop
Transconductance
ICTL = REFIN, VCSIP - VCSIN = 72mV
1.8
2.4
3.0 µA/mV
4 _______________________________________________________________________________________
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