Datasheet

MAX846A
MAX846A
Cost-Saving Multichemistry
Battery-Charger System
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (Note 1)
(V
DCIN
= 10V, ON = VL, I
VL
= I
VSET
= 0mA, V
CS
- = V
CS+
= 10V, V
BATT
= 4.5V, V
OFFV
= V
CELL2
= 0V, T
A
= -40°C to +85°C, unless
otherwise noted.)
kΩ
-2% 20 +2%Output Resistance
Transconductance V
ISET
= 1.7V, V
CS+
- V
CS-
= 165mV
Measured at VSET, I
VSET
= 0mA, V
ON
= 0V
0.93 1.07 mA/V
Rising VL edge, 2% hysteresis
Output Offset Current V
CS+
= 4V
0mA < I
VL
< 20mA, 3.7V < V
DCIN
< 20V
5
CONDITIONS
µA
CS+, CS- Off Input Current V
ON
= 0V, V
CS+
= V
CS-
= 10V 10
µA
V
VSET
= 1.650V, V
CELL2
= 0V, I
DRV
= 1mA,
V
DRV
= 10V
-0.35% 4.2 +0.35%
BATT Off Input Current V
BATT
= 10V, ON = GND, CELL2 = GND or VL 1
µA
V-0.7% 1.650 +0.7%Output Voltage
V2.9 3.1PWROK Trip Level
V3.259 3.341Output Voltage
UNITSMIN TYP MAXPARAMETER
Voltage-Loop Set Point
V
VSET
= 1.650V, V
CELL2
= VL, I
DRV
= 1mA,
V
DRV
= 10V
-0.35% 8.4 +0.35%
V
Current-Loop Set Point I
DRV
= 5mA, V
DRV
= 10V 1.625 1.675 V
Overcurrent Trip Level
When V
ISET
exceeds this voltage, DRV current
is disabled.
1.86 2.14 V
DRV Off Current
DRV Sink Current V
DRV
= 3V 20 mA
V
DRV
= 20V
,
ON = GND 100
µA
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
V
DCIN
= 20V, I
DRV
= I
VL
= 0mA mA5DCIN Supply Current
V2.5 3.0VL Undervoltage-Lockout Level
VL REGULATOR
REFERENCE
CURRENT-SENSE AMPLIFIER
VOLTAGE LOOP
CURRENT LOOP
DRIVER