Datasheet

MAX1925/MAX1926
Switch-Mode 1-Cell Li+ Chargers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
PGND
= V
GND
= 0, V
INP
= V
IN
= V
CHG
= 5V, V
BATT
= V
CS
= V
EN
= 4V, THRM = 10kΩ to GND, C
CT
= 100nF, T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN, INP, ACON to GND...........................................-0.3V to +14V
CHG, EXT to PGND ...................................-0.3V to (V
INP
+ 0.3V)
CS, BATT, EN, THRM to GND ..................................-0.3V to +6V
CT to GND ................................................................-0.3V to +4V
EN, THRM, CT to IN................................................-14V to +0.3V
INP to IN ................................................................-0.3V to +0.3V
PGND to GND .......................................................-0.3V to +0.3V
CS to BATT ............................................................-0.3V to +0.3V
EXT Continuous RMS Current.........................................±100mA
Continuous Power Dissipation (T
A
= +70°C)
Exposed Paddle Soldered to Board
(derate 16.9mW/°C above +70°C).............................1349mW
Exposed Paddle Unsoldered
(derate 9mW/°C above +70°C)....................................721mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
INP
, V
IN
(MAX1925 does not charge above 6.1V) 4.5 12.0 V
MAX1925 4.30 4.50 4.78
V
INP
, V
IN
rising
MAX1926 4.00 4.25 4.50
MAX1925 4.17 4.30 4.43
ACON Trip Point
V
INP
, V
IN
falling
MAX1926 3.90 4.15 4.40
V
Rising 5.8 6.4
INP, IN Shutdown Threshold MAX1925
Falling 5.3 5.9
V
EN Input Resistance MAX1926 internally pulled up to 3V 125 300 550 kΩ
EN Leakage Current MAX1925 -1 +1 µA
EN Logic Input High Threshold 2 V
EN Logic Input Low Threshold 0.8 V
DONE state, V
BATT
= 4.1V 25 50
EN = GND (Note 1) 2 10
BATT + CS Input Current
(Total Current into BATT and CS)
V
BATT
= V
INP
= V
IN
= 4V, shutdown (Note 1) 2 10
µA
CS Input Current Charging 39 µA
EN = GND 5 8 mA
V
BATT
= V
INP
= V
IN
= 4V, shutdown 2 10 µA
V
BATT
= 4.1V; charging 10
IN + INP Total Input Current
V
BATT
= 4.3V; done 5 8
mA
VOLTAGE LOOP
Voltage Loop Set Point 4.1685 4.2000 4.2315 V
Voltage Loop Hysteresis 15 mV
BATT Prequal1 Voltage Threshold 1.9 2 2.1 V
BATT Prequal2 Voltage Threshold 2.85 3 3.15 V