MAX1757 datasheet(2/17 Pages) MAXIM

Part #	MAX1757

Description	Stand-Alone, Switch-Mode Li Battery Charger with Internal 14V Switch

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Manufacturer	MAXIM [Maxim Integrated Products]

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Stand-Alone, Switch-Mode

Li+ Battery Charger with Internal 14V Switch

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, VDCIN = VHSD = VCSSP = VCSSN = 12V, V SHDN = VVL, VCELL = GND, VBATT = VCS = 4.2V, VVADJ = VREF/2,

VISETIN = VISETOUT = VREF, RTHM = 10k

Ω, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +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.

BATT, CS, DCIN, CSSP, CSSN, HSD to GND ........-0.3V to +15V

CSSP to CSSN.......................................................-0.6V to +0.6V

BST to GND ............................................................-0.3V to +21V

BST to LX..................................................................-0.3V to +6V

LX to PGND ..............................................-0.6V to (VHSD + 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

CS to BATT Current ............................................................±3.5A

PGND to GND .......................................................-0.3V to +0.3V

VL Source Current...............................................................50mA

Continuous Power Dissipation (TA = +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 Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

VBATT = 14V, done state

Falling edge

CELL = REF, VBATT = 12V, any charging state

V SHDN = GND, VBATT =14V

6V < VDCIN < 14V

Internal resistor between CS and BATT,

1.5A RMS operating

See PWM Controller section

VBST = VLX + 4.5V

VLX = VHSD = VDCIN =14V, VSHDN = GND

IREF = 0 to 1mA

VLX = PGND, VHSD = VDCIN = 14V,

V SHDN = GND

VCSSN = VCSSP = VDCIN = 14V, VSHDN = GND

6V < VDCIN < 14V

Rising edge

6V < VDCIN < 14V

IVL = 0 to 15mA

In dropout, fOSC / 4

6V < VDCIN < 14V

Nondropout fOSC

CONDITIONS

µA

150

270

BATT, CS Input Current

µA

280

540

µA

0.1

5

m

Ω

110

170

RCS

CS to BATT Current-Sensing

Resistance

Ω

12

LX to PGND On-Resistance

m

Ω

150

250

HSD to LX On-Resistance

µA

0.1

10

LX Off-State Leakage

µA

0.1

10

HSD Off-State Leakage

µA

210

CSSN/CSSP Off-State Leakage

%

97

98

LX Maximum Duty Cycle

kHz

270

300

330

fOSC

PWM Oscillator Frequency

V

0.075

0.125

0.175

DCIN to BATT Dropout

Threshold, DCIN Falling

mA

57

DCIN Quiescent Supply Current

mV

614

REF Load Regulation

mV

26

REF Line Regulation

V

0.20

0.30

0.40

DCIN to BATT Dropout

Threshold, DCIN Rising

V

5.10

5.40

5.70

VL Output Voltage

mV

44

65

VREF

4.179

4.20

4.221

REF Output Voltage

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

V

614

DCIN Input Voltage Range

SUPPLY AND REFERENCE

SWITCHING REGULATOR

VL Output Load Regulation

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