Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
MAX1758
ABSOLUTE MAXIMUM RATINGS
DCIN, CSSP, CSSN, HSD to GND..........................-0.3V to +30V
CSSP to CSSN.......................................................-0.6V to +0.6V
BST to GND ............................................................-0.3V to +36V
BST to LX..................................................................-0.3V to +6V
LX to PGND ..............................................-0.6V to (V
HSD
+ 0.3V)
VL,
SHDN,
ISETIN, ISETOUT, REF, VADJ, CELL, TIMER1,
TIMER2, CCI, CCS, CCV, THM to GND ................-0.3V to +6V
FASTCHG, FULLCHG, FAULT
to GND ..................-0.3V to +30V
BATT, CS to GND ...................................................-0.3V to +20V
CS to BATT Current ............................................................±3.5A
PGND to GND .......................................................-0.3V to +0.3V
VL Source Current...............................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin SSOP (derate 9.5mW/°C above +70°C) ...........762mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature.........................................-65°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
(Circuit of Figure 1, V
DCIN
= V
HSD
= V
CSSP
= V
CSSN
= 18V, V
SHDN
= V
VL
, V
CELL
= GND, V
BATT
= V
CS
= 4.2V, V
VADJ
= V
REF
/ 2,
V
ISETIN
= V
ISETOUT
= V
REF
, R
THM
= 10kΩ,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SUPPLY AND REFERENCE
DCIN Input Voltage Range
DCIN Quiescent Supply Current
DCIN to BATT Dropout
Threshold, DCIN Falling
DCIN to BATT Dropout
Threshold, DCIN Rising
VL Output Voltage
VL Output Load Regulation
REF Output Voltage
REF Line Regulation
REF Load Regulation
SWITCHING REGULATOR
PWM Oscillator Frequency
LX Maximum Duty Cycle
CSSN/CSSP Off-State Leakage
HSD Off-State Leakage
LX Off-State Leakage
HSD to LX On-Resistance
LX to PGND On-Resistance
CS to BATT Current-Sensing
Resistance
BATT, CS Input Current
R
CS
6V < V
DCIN
< 28V
Falling edge
Rising edge
6V < V
DCIN
< 28V
I
VL
= 0 to 15mA
6V < V
DCIN
< 28V
6V < V
DCIN
< 28V
I
REF
= 0 to 1mA
Nondropout f
OSC
In-dropout, f
OSC
/ 4
V
CSSN
= V
CSSP
= V
DCIN
= 28V, V
SHDN
= GND
V
LX
= PGND, V
HSD
= V
DCIN
= 28V,
V
SHDN
= GND
V
LX
= V
HSD
= V
DCIN
=28V, V
SHDN
= GND
V
BST
= V
LX
+ 4.5V
See
PWM Controller
section
Internal resistor between CS and BATT,
1.5A RMS operating
V
SHDN
= GND, V
BATT
= 19V
CELL = REF, V
BATT
= 15V, any charging state
V
BATT
= 18V, done state
0.075
0.20
5.10
4.179
6
5
0.125
0.30
5.40
44
4.20
2
6
300
98
2
0.1
0.1
260
1
110
0.1
280
150
28
7
0.175
0.40
5.70
65
4.221
6
14
330
10
10
10
450
2
170
5
540
270
V
mA
V
V
V
mV
V
mV
mV
kHz
%
µA
µA
µA
mΩ
Ω
mΩ
µA
µA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
REF
f
OSC
270
97
2
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
