MAX8725 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8725 Datasheet PDF : 30 Pages
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Multichemistry Battery Chargers with Automatic
System Power Selector
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VDCIN = VCSSP = VCSSN = 18V, VBATT = VCSIP = VCSIN = 12V, VVCTL = VICTL = 1.8V, MODE = float, ACIN = 0, CLS =
REF, GND = PGND = 0, PKPRES = GND, LDO = DLOV, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
LDO Undervoltage-Lockout Trip
Point
VDCIN = 8.0V
3.20
5.15
V
REFERENCE
REF Output Voltage
REF Undervoltage-Lockout Trip
Point
Ref
0 < IREF < 500µA
REF falling
4.1960
4.2520
V
3.9
V
TRIP POINTS
BATT POWER_FAIL Threshold
BATT POWER_FAIL Threshold
Hysteresis
VDCIN - VBATT, VDCIN falling
50
150
mV
100
300
mV
ACIN Threshold
ACIN Threshold Hysteresis
SWITCHING REGULATOR
DHI Off-Time
DHI Minimum Off-Time
DLOV Supply Current
Sense Voltage for Battery
Undervoltage Charge Current
ACIN rising
2.007
10
VBATT = 16.0V, VDCIN = 19V, VMODE = 3.6V 360
VBATT = 16.0V, VDCIN = 17V, VMODE = 3.6V 260
IDLOV DLO low
MAX1909 only, BATT = 3.0V per cell
3
2.089
V
30
mV
440
ns
350
ns
10
µA
6
mV
Battery Undervoltage Threshold
DHIV Output Voltage
DHIV Sink Current
DHI On-Resistance Low
DHI On-Resistance High
DLO On-Resistance High
DLO On-Resistance Low
ERROR AMPLIFIERS
GMV Loop Transconductance
GMI Loop Transconductance
GMS Loop Transconductance
CCI/CCS/CCV Clamp Voltage
LOGIC LEVELS
MODE Input Low Voltage
MODE Input Middle Voltage
MAX1909 only, MODE = float (3 cell),
VBATT rising
MAX1909 only, MODE = LDO (4 cell),
VBATT rising
With respect to SRC
DHI = VDHIV, IDHI = -10mA
DHI = VCSSN, IDHI = 10mA
VDLOV = 4.5V, IDLO = +100mA
VDLOV = 4.5V, IDLO = -100mA
9.18
12.235
-4.5
10
VCTL = 3.6, VBATT = 16.8V, MODE = LDO
VCTL = 3.6, VBATT = 12.6V, MODE = FLOAT
MAX1909: ICTL = 3.6V, MAX8725: VICTL =
3.2V, VCSSP - VCSIN = 75mV
VCLS = 2.048V, VCSSP - VCSSN = 75mV
0.25V < VCCV < 2.0V, 0.25V < VCCI < 2.0V,
0.25V < VCCS < 2.0V
0.0625
0.0833
0.5
0.5
150
1.6
9.42
V
12.565
-5.5
V
mA
5
Ω
4
Ω
7
Ω
3
Ω
0.2500
mA/V
0.3330
2.0 mA/V
2.0 mA/V
600
mV
0.8
V
2.0
V
8 _______________________________________________________________________________________
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