MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.)
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.
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
V
BATT
= 18V, done state
Falling edge
CELL = REF, V
BATT
= 15V, any charging state
V
SHDN
= GND, V
BATT
= 19V
6V < V
DCIN
< 28V
Internal resistor between CS and BATT,
1.5A RMS operating
See PWM Controller section
V
BST
= V
LX
+ 4.5V
V
LX
= V
HSD
= V
DCIN
=28V, V
SHDN
= GND
I
REF
= 0 to 1mA
V
LX
= PGND, V
HSD
= V
DCIN
= 28V,
V
SHDN
= GND
V
CSSN
= V
CSSP
= V
DCIN
= 28V, V
SHDN
= GND
6V < V
DCIN
< 28V
Rising edge
6V < V
DCIN
< 28V
I
VL
= 0 to 15mA
In-dropout, f
OSC
/ 4
6V < V
DCIN
< 28V
Nondropout f
OSC
CONDITIONS
µA150 270
BATT, CS Input Current
µA280 540
µA0.1 5
mΩ110 170R
CS
CS to BATT Current-Sensing
Resistance
Ω12LX to PGND On-Resistance
mΩ260 450HSD to LX On-Resistance
µA0.1 10LX Off-State Leakage
µA0.1 10HSD Off-State Leakage
µA210CSSN/CSSP Off-State Leakage
%97 98LX Maximum Duty Cycle
kHz270 300 330f
OSC
PWM Oscillator Frequency
V0.075 0.125 0.175
DCIN to BATT Dropout
Threshold, DCIN Falling
mA57DCIN Quiescent Supply Current
mV614REF Load Regulation
mV26REF Line Regulation
V4.179 4.20 4.221
V0.20 0.30 0.40
DCIN to BATT Dropout
Threshold, DCIN Rising
V5.10 5.40 5.70VL Output Voltage
mV44 65
V
REF
REF Output Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
V628DCIN Input Voltage Range
SUPPLY AND REFERENCE
SWITCHING REGULATOR
VL Output Load Regulation
