Low-Cost, Multichemistry Battery-
Charger Building Block
MAX1772
ABSOLUTE MAXIMUM RATINGS
DCIN, CSSP, CSSN to GND ...................................-0.3V to +30V
BST to GND ............................................................-0.3V to +36V
BST to LX..................................................................-0.3V to +6V
DHI to LX ....................................................-0.3V to (BST + 0.3V)
LX to GND .................................................................-6V to +30V
BATT, CSIP, CSIN to GND........................................-0.3V to 20V
CSIP to CSIN or CSSP to CSSN or
PGND to GND ...........……….……………..…….-0.3V to +0.3V
CCI, CCS, CCV, DLO, ICHG, IINP,
ACIN, REF to GND ..............................-0.3V to (VLDO + 0.3V)
DLOV, VCTL, ICTL, REFIN, CELLS,
CLS, LDO, ACOK to GND ....................................-0.3V to +6V
DLOV to LDO.........................................................-0.3V to +0.3V
DLO to PGND ..........................................-0.3V to (DLOV + 0.3V)
LDO Short-Circuit Current ..................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C).........860mW
Operating Temperature Range
MAX1772EEI ....................................................-40°C to +85°C
Junction Temperature ........................................................150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°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.
ELECTRICAL CHARACTERISTICS
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3.0V, V
VCTL
= V
ICTL
= 0.75
✕
REFIN, CELLS = 2.0V,
ACIN = 0, CLS = REF, V
BST
- V
LX
= 4.5V, GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; pins CCI, CCS, and CCV are
compensated per Figure 1a;
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
8
DCIN falling
DCIN rising
I
DCIN
8.0V < V
DCIN
< 28V
8.0V < V
DCIN
< 28V, no load
0 < I
LDO
< 10mA
V
DCIN
= 8.0V
0 < I
REF
< 500µA
REF falling
3.20
4.072
5.25
7.0
7.4
7.5
2.7
5.40
34
4.00
4.096
3.1
7.85
6.0
5.55
100
5.15
4.120
3.9
TYP
MAX
28
UNITS
V
V
mA
V
mV
V
V
V
SUPPLY AND LDO REGULATOR
V
DCIN
DCIN Input Voltage Range
DCIN Undervoltage Lockout
Trip Point
DCIN Quiescent Current
LDO Output Voltage
LDO Load Regulation
LDO Undervoltage Lockout
Trip Point
REF Output Voltage
REF Undervoltage Lockout
Trip Point
TRIP POINTS
BATT POWER_FAIL Threshold
BATT POWER_FAIL Threshold
Hysteresis
ACIN Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
CLS Input Range
CLS Input Bias Current
SWITCHING REGULATOR
Minimum Off-Time
Maximum On-Time
Oscillator Frequency
f
OSC
(Note 1)
V
BATT
=16.8V
V
CLS
= 2.0V
ACIN rising
0.5% of REF
V
ACIN
= 2.048V
V
CSSP
falling
50
100
2.007
10
-1
1.6
-1
1.00
5
100
200
2.048
20
150
300
2.089
30
+1
REF
+1
mV
mV
V
mV
µA
V
µA
µs
ms
kHz
1.25
10
1.50
15
400
2
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
