MAX1873 Maxim, MAX1873 Datasheet - Page 5

• Manufacturer Part Number: MAX1873
• Description: Simple Current-Limited Switch-Mode Li Charger Controller
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
MAX1873S: V
unless otherwise noted.)
Note 1: While it may appear possible to set the Battery Regulation Voltage higher than the Battery Overvoltage Cutoff Threshold, this
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
CURRENT SENSE
CONTROL INPUTS/OUTPUTS
BATT Undervoltage Threshold
CSB to BATT Battery Current-Sense
Voltage
CSB to BATT Current-Sense Voltage
when V
CSSP to CSSN Current-Sense Voltage
ICHG/EN Input Threshold
ICHG/EN Input Voltage Range for
Charge Current Adjustment
VADJ Input Current
ICHG/EN Input Current
VADJ Input Voltage Range
IOUT Voltage
cannot happen because both parameters are derived from the same reference and track each other.
BATT
BATT
< 2.5V per Cell
PARAMETER
= V
_______________________________________________________________________________________
CSB
DCIN
= 12.6V; MAX1873T: V
= V
Simple Current-Limited Switch-Mode
CSSP
= V
CSSN
For I
charge
V
V
6V < V
Includes 50mV of hysteresis
V
V
Full scale
25% scale
Trickle charge
No charge
current
ICHG/EN
ICHG/EN
VADJ
ICHG/EN
= 18V, V
CHG
BATT
CSSP
= V
/20 trickle
= V
= V
= V
REF
= V
< 28V
ICHG/EN
REF
REF
REF
/2
CSB
/4
CONDITIONS
= 16.8V; T
V
0 < I
V
0 < I
V
V
I
IOUT
CSB
CSB
CSB
CSB
= V
OUT
OUT
Li+ Charger Controller
MAX1873R
MAX1873S
MAX1873T
= sinking 20µA
- V
- V
- V
- V
REF
BATT
BATT
BATT
BATT
< 500µA
< 500µA
, V
A
= -40°C to +85°C. Typical values are at T
VADJ
= 200mV,
= 50mV,
= 10mV
= 0,
= V
REF
/2. MAX1873R: V
-100
-100
MIN
190
500
700
4.8
7.2
9.6
3.6
0.9
40
90
75
40
5
0
BATT
= V
MAX
V
V
10.4
210
110
700
100
100
325
5.2
7.8
4.4
1.1
60
15
90
REF
REF
CSB
A
= +25°C,
= 8.4V;
UNITS
mV
mV
mV
mV
mV
mV
mV
nA
nA
V
V
V
5