Electrical characteristics – Rainbow Electronics MAX1555 User Manual
Page 3
MAX1551/MAX1555
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
_______________________________________________________________________________________
3
Note 1: The input undervoltage lockout has 430mV of hysteresis. The charger turns on when an input rises to 3.95V (typ), and turns
off when it falls below 3.52V.
Note 2: Specifications to -40
°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS
(V
DC
= 5V, V
USB
= 0, I
BAT
= 0, C
BAT
= 1µF, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN
MAX
UNITS
DC
DC Voltage Range
(Note 1)
3.7
7.0
V
DC to BAT Voltage Range
0.1
6.0
V
DC Undervoltage Lockout
Threshold
Input rising, 430mV hysteresis, V
BAT
= 3V (Note 1)
3.75
4.15
V
DC Supply Current
3
mA
DC to BAT On-Resistance
V
DC
= 3.7V, V
BAT
= 3.6V
2
Ω
DC to BAT Dropout Voltage
When charging stops, V
BAT
= 4V, DC falling, 200mV
hysteresis
30
95
mV
USB
USB Voltage Range
(Note 1)
3.7
6.0
V
USB Undervoltage Lockout
Threshold
Input rising, 430mV hysteresis, V
DC
= 0, V
BAT
= 3V
(Note 1)
3.75
4.15
V
USB Supply Current
V
USB
= 5V, V
DC
= 0
3
mA
USB to BAT On-Resistance
V
USB
= 3.7V, V
BAT
= 3.6V, V
DC
= 0
4
Ω
USB to BAT Dropout Voltage
When charging stops, V
BAT
= 4V, USB falling, 200mV
hysteresis, V
DC
= 0
30
95
mV
BAT
BAT Regulation Voltage
V
DC
or V
USB
= 5V
4.141
4.259
V
DC Charging Current
V
BAT
= 3.3V, V
USB
= 0, V
DC
= 5V
220
340
mA
USB Charging Current
V
BAT
= 3.3V, V
DC
= 0, V
USB
= 5V
80
100
mA
BAT Prequal Threshold
V
BAT
rising, 100mV hysteresis
2.9
3.1
V
Prequalification Charging Current
V
BAT
= 2.8V
20
80
mA
BAT Leakage Current
V
DC
= V
USB
= 0, V
BAT
= 4.2V
5
µA
POK, CHG
CHG Threshold
Charge current where
CHG goes high,
I
BAT
falling, 50mA hysteresis
25
100
mA
CHG, POK Logic-Low Output
I
CHG
, I
POK
= 10mA
300
mV
CHG, POK Leakage Current
V
CHG
, V
POK
= 6V, T
A
= +25
°C
1
µA