Rainbow Electronics MAX1870A - Manual (Page 7)

MAX1870A
Step-Up/Step-Down
Li+ Battery Charger
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PARAMETER CONDITIONS MIN TYP MAX UNITS
SUPPLY AND LINEAR REGULATOR
DCIN Input Voltage Range 8 28 V
DCIN falling 4
DCIN Undervoltage Lockout
DCIN rising 7.85
V
DCIN Quiescent Current 8.0V < V DCIN < 28V 6 mA
BATT Input Voltage Range 0 19 V
BATT Input Bias Current VBATT = 2V to 19V 500 µA
LDO Output Voltage No load 5.3 5.5 V
LDO Undervoltage Lockout V DCIN = 8V, LDO rising 4.00 5.25 V
REFERENCE
REF Output Voltage I REF = 0µA 4.060 4.132 V
REF Load Regulation 0 < I
REF
< 500µA 10 mV
REF Undervoltage-Lockout Trip
Point
V REF falling 3.9 V
REFIN Input Range 2.5 3.6 V
REFIN UVLO Rising 2.2 V
REFIN Input Bias Current V DCIN = 18V 100 µA
SWITCHING REGULATOR
C ycl e- b y- C ycl e S tep - U p M axi m um
C ur r ent- Li m i t S ense V ol tag e
V DCIN = 12V, V BATT = 16.8V 130 170 mV
C ycl e- b y- C ycl e S tep - D ow n
M axi m um C ur r ent- Li m i t S ense
V ol tag e
V DCIN = 19V, V BATT = 16.8V 130 170 mV
Step-Down On-Time V DCIN = 18V, V BATT = 16.8V 2.2 2.6 µs
Minimum Step-Down Off-Time V DCIN = 18V, V BATT = 16.8V 0.15 0.50 µs
Step-Up Off-Time V DCIN = 12V, V BATT = 16.8V 1.6 2.0 µs
Minimum Step-Up On-Time V DCIN = 12V, V BATT = 16.8V 0.15 0.40 µs
MOSFET DRIVERS
VHP - VHN Output Voltage 8V < V VHP < 28V, no load 4.5 5.5 V
VHN Load Regulation 0 < I VHN < 10mA 150 mV
DHI On-Resistance High I SOURCE = 10mA 5
Ω
DHI On-Resistance Low I SINK = 10mA 3
Ω
VHP Input Bias Current V DCIN = 18V 2 mA
BLKP Input Bias Current V ICTL = V REFIN = 3.3V 400 µA
DLOV Supply Current DBST low 10 µA
DBST On-Resistance High I SOURCE = 10mA 5 Ω
DBST On-Resistance Low I SINK = 10mA 3
Ω
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 2, V DCIN = V CSSP = V CSSN = V CSSS = V VHP = 18V, V BATT = V CSIP = V CSIN = V BLKP = 12V, V REFIN = 3.0V, V ICTL =
0.75 x V
REFIN
, VCTL = LDO, CELLS = FLOAT, GND = PGND = 0, V
DLOV
= 5.4V, T A = -40°C to +85°C.) (Note 1)