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LTC4091

4091fa

For more information www.linear.com/LTC4091

The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = RUN/SS = 12V, BOOST = 17V, VBAT = 3.7V and

RPROG = 105k, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

External Ideal Diode

VFWD,EXT External Diode Forward Voltage

Logic (CHRG, VINGD, HVPR, TIMER, RUN/SS, SYNC)

VCHG,SD

Charger Shutdown Threshold Voltage on TIMER

VTIMER Falling

0.1

ICHG,SD

Charger Shutdown Pull-Up Current on TIMER

VTIMER = 0V

µA

VOL

Output Low Voltage

(CHRG, HVPR); ISINK = 5mA

0.1

0.4

VRUN,H

RUN/SS High Threshold

VRUN,L

RUN/SS Low Threshold

0.2

IRUN/SS

RUN/SS Pin Bias Current

RUN/SS = 2.5V

µA

IVGLK

VINGD Leakage

VINGD = 5V, RUN/SS = 0V

0.1

µA

IVG

VINGD Sink Current

VINGD = 0.4V

100

400

µA

VSYNC,L

SYNC Low Threshold

0.3

VSYNC,H

SYNC High Threshold

ISYNC

SYNC Pin Bias Current

VSYNC = 0V

–0.1

µA

NTC

IVNTC

VNTC Pin Current

VNTC = 2.5V

1.4

2.5

3.5

VVNTC

VNTC Bias Voltage

IVNTC = 500µA

4.4

4.85

INTC

NTC Input Leakage Current

NTC = 1V

±1

µA

VCOLD

Cold Temperature Fault Threshold Voltage

Rising NTC Voltage

Hysteresis

0.738 • VNTC

0.02 • VNTC

VHOT

Hot Temperature Fault Threshold Voltage

Falling NTC Voltage

Hysteresis

0.290 • VNTC

0.01 • VNTC

VDIS

NTC Disable Threshold Voltage

Falling NTC Voltage

Hysteresis

100

125

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC4091 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC4091E is guaranteed to meet specifications from

0°C to 85°C junction temperature. Specifications over the –40°C to

125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC4091I is guaranteed over the –40°C to 125°C operating junction

temperature range. Note that the maximum ambient temperature

consistent with these specifications is determined by specific operating

conditions in conjunction with board layout, the rated package thermal

impedance and other environmental factors. The junction temperature (TJ,

in °C) is calculated from the ambient temperature (TA, in °C) and power

dissipation (PD, in Watts) according to the formula:

TJ = TA + (PD • θJA)

where θJA = 31.8°C/W for the DJC package.

Note 3: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperatures will exceed 110°C when overtemperature protection is

active. Continuous operation above the specified maximum operating

junction temperature may result in device degradation or failure.

Note 4: VCC is the greater of VOUT, and VBAT

Note 5: Accuracy of programmed current may degrade for currents

greater than 1.5A.

Note 6: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the switch.

Note 7: Absolute Maximum Voltage at VIN and RUN/SS pins is for

nonrepetitive one second transients; 40V for continuous operation.

Note 8: Due to the thermal regulation feature of the battery charger, circuit

parameters in the Battery Management section are not testable and do not

apply above 85°C.

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