Low-Cost, Multichemistry Battery-
Charger Building Block
MAX172
ELECTRICꢃL CHꢃRꢃCTERISTICS
ꢀ
(V
= V
= V
= 18V, V
= V
= V
= V
= 12V, V
= 3.0V, V
= 1µF, LDO = DLOV, C
= V
= 0.75
REF
V
, V
= 2.0V,
CELLS
DCIN
CSSP
CSSN
BATT
- V = 4.5V, V
CSIP
CSIN
REFIN
VCTL
ICTL
REFIN
V
= 0V, CLS = REF, V
= 0V, C
= 1µF; pins CCI, CCS, and CCV
ACIN
BST
LX
GND
PGND
LDO
are compensated per Figure 1a; T = -4±°C tV +8.°C, unless otherwise noted.) (Note 1)
ꢃ
PꢃRꢃMETER
SYMBꢀL
CꢀNDITIꢀNS
MIN
TYP
MꢃX
ꢄNITS
SꢄPPLY ꢃND LDꢀ REGꢄLꢃTꢀR
DCIN Input Voltage Range
V
8.0
7
28.0
V
V
DCIN
V
V
falling
rising
DCIN
DCIN
DCIN Undervoltage Lockout
Trip Point
7.85
6
I
8.0V < V
8.0V < V
< 28V
DCIN Quiescent Current
LDO Output Voltage
TRIP PꢀINTS
mA
V
DCIN
DCIN
DCIN
< 28V, no load
5.25
5.65
V
falling
BATT POWER_FAIL Threshold
50
150
300
mV
mV
CSSP
BATT POWER_FAIL Threshold
Hysteresis
100
V
rising
ACIN Threshold
2.007
10
2.089
30
V
mV
µA
V
ACIN
ACIN Threshold Hysteresis
ACIN Input Bias Current
CLS Input Range
0.5% of REF
V
V
V
= 2.048V
-1
+1
ACIN
1.6
-1
REF
+1
= 2.0V
CLS Input Bias Current
SWITCHING REGꢄLꢃTꢀR
Minimum Off-Time
µA
CLS
= 16.8V
1
5
1.5
15
µs
ms
kHz
%
BATT
Maximum On-Time
f
Oscillator Frequency
DHI Maximum Duty Cycle
(Note 1)
400
OSC
99
V
= 19V, V
= 0V
5
BATT
DCIN
I
BATT Input Current
µA
µA
µA
V
BATT
V
V
V
V
V
= 2V to 19V, V
= 0V
> V
+ 0.3V
BATT
500
5
BATT
DCIN
CSIP
DCIN
CSSP
DCIN
CSIP/CSIN Input Current
CSSP/CSSN Input Current
= V
= 12V
800
0.3
800
CSIN
= 0V
= V
= V
> 8.0V
CSSN
DCIN
BATT/CSIP/CSIN Input Voltage
Range
0
19
CSIP to CSIN Full-Scale
Current-Sense Voltage
V
= 12V
189
189
219
219
mV
mV
BATT
CSSP to CSSN Full-Scale
Current-Sense Voltage
CꢄRRENT ꢃND ꢁꢀLTꢃGE SETTING
ICTL = REFIN (see Equation 2)
-8
-55
-1
+8
+55
+1
Charging Current Accuracy
%
ICTL = REFIN/32 (see Equation 2)
V
V
= V
= V
= 3V
VCTL
DCIN
ICTL
REFIN
= V
ICTL, VCTL, REFIN Input Bias
Current
µA
= 0V, V
= V
= 5V
REFIN
-1
+1
VCTL
ICTL
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.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
