LTC3335 datasheet(4/32 Pages) AD

4 / 32 page

LTC4120/LTC4120-4.2

Rev. G

For more information www.analog.com

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = VRUN = 15V, VCHGSNS = VBAT = 4V, RPROG = 3.01k,

VFB = 2.29V (LTC4120), VBATSNS = 4V (LTC4120-4.2). Current into a pin is positive out of the pin is negative.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ILOWBAT

Low Battery Linear Charge Current

0V < VFB < VTRKL, VBAT = 2.6V (LTC4120),

VBATSNS < VTRKL_4.2, VBAT = 2.6V (LTC4120-4.2)

VLOWBAT

Low Battery Threshold Voltage

VBAT Rising (LTC4120),

VBATSNS Rising (LTC4120-4.2)

2.15

2.21

2.28

Hysteresis

147

ITRKL

Switch Mode Trickle Charge Current

VLOWBAT < VBAT, VFB < VTRKL (LTC4120) (Note 5),

VLOWBAT < VBATSNS < VTRKL_4.2 (LTC4120-4.2)

ICHG/10

PROG Pin Servo Voltage in Switch Mode

Trickle Charge

VLOWBAT < VBAT, VFB < VTRKL (LTC4120) (Note 5),

VLOWBAT < VBATSNS < VTRKL_4.2 (LTC4120-4.2)

122

VTRKL

Trickle Charge Threshold

VFB Rising (LTC4120) (Note 5)

1.64

1.68

1.71

Hysteresis

VFB Falling (LTC4120) (Note 5)

VTRKL_4.2

Trickle Charge Threshold

VBATSNS Rising (LTC4120-4.2)

2.86

2.91

2.98

Hysteresis

VBATSNS Falling (LTC4120-4.2)

hC/10

End of Charge Indication Current Ratio

(Note 6)

0.1

mA/mA

Safety Timer Termination Period

1.3

2.0

2.8

Hours

Bad Battery Termination Timeout

Minutes

Switcher

fOSC

Switching Frequency

FREQ = INTVCC

FREQ = GND

1.0

0.5

1.5

0.75

2.0

1.0

MHz

tMIN(ON)

Minimum Controllable On-Time

(Note 9)

120

Duty Cycle Maximum

(Note 9)

Top Switch RDS(ON)

ISW = –100mA

0.8

Bottom Switch RDS(ON)

ISW = 100mA

0.5

IPEAK

Peak Current Limit

Measured Across RSNS with a 15µH Inductor in

Series with RSNS (Note 9)

585

750

1250

ISW

Switch Pin Current (Note 8)

VIN = Open-Circuit, VRUN = 0V, VSW = 8.4V (LTC4120)

VIN = Open-Circuit, VRUN = 0V, VSW = 4.2V

(LTC4120-4.2)

µA

Status Pins FAULT, CHRG

Pin Output Voltage Low

I = 2mA

500

Pin Leakage Current

V = 43V, Pin High Impedance

µA

NTC

Cold Temperature VNTC/VINTVCC Fault

Rising VNTC Threshold

Falling VNTC Threshold

%INTVCC

Hot Temperature VNTC/VINTVCC Fault

Falling VNTC Threshold

Rising VNTC Threshold

35.5

36.5

37.5

37.5 %INTVCC

%INTVCC

NTC Disable Voltage

Falling VNTC Threshold

Rising VNTC Threshold

%INTVCC

NTC Input Leakage Current

VNTC = VINTVCC

–50

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