LT6650 datasheet(3/12 Pages) LINER

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LT6650

6650f

∆VDO

Dropout Voltage (Note 7)

Referred to VIN = 1.8V, VOUT = 1.4V

(RF = 100k, RG = 39.2k)

∆VOUT = –0.1%, IOUT = 0µA

100

150

∆VOUT = –0.1%, IOUT = –200µA Sourcing

165

250

350

∆VOUT = –0.1%, IOUT = 200µA Sinking (Note 11)

–300

–150

0mV

ISC

Short-Circuit Output Current

VOUT Shorted to GND

VOUT Shorted to VIN

9mA

IIN

Supply Current

5.6

µA

VIN = 18V

5.9

µA

IFB

FB Pin Input Current

VFB = VOUT = 400mV

1.2

LT6650CS5, LT6650IS5

LT6650HS5

TON

Turn-On Time

CLOAD = 1µF

0.5

Output Noise (Note 8)

0.1Hz

≤ ƒ ≤ 10Hz

µVP-P

10Hz

≤ ƒ ≤ 1KHz, IOUT = –200µA Sourcing

µVRMS

VHYS

Hysteresis (Note 9)

∆T = 0°C to 70°C

0.1

250

ppm

∆T = –40°C to 85°C

0.24

600

ppm

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The FB pin is protected by an ESD diode to the ground. If the FB

input voltage exceeds –0.3V below ground, the FB input current should be

limited to less than 10mA. If the FB input voltage is greater than 5V, the FB

input current is expected to meet specified performance from Typical

Performance Characteristics but is not tested or QA sampled at this

voltage.

Note 3: If the part is operating at temperatures above 85

°C, it is

recommended to enhance the stability margin by using an output

capacitor greater than 10

µF or a series RC combination having a 100µs

equivalent time constant. See Application section for details.

Note 4: If the part is stored outside of the specified temperature range, the

output voltage may shift due to hysteresis.

Note 5: ESD (Electrostatic Discharge) sensitive devices. Extensive use of

ESD protection devices are used internal to the LT6650; however, high

electrostatic discharge can damage or degrade the device. Use proper ESD

handling precautions.

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, CIN = 1µF, FB = OUT, no DC load, CL = 1µF, unless

otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Note 6: Load regulation is measured on a pulse basis from no load to the

specified load current. Output changes due to die temperature change

must be taken into account separately.

Note 7: Dropout Voltage is (VIN – VOUT) when VOUT falls to 0.1% below its

nominal value at VIN = 1.8V.

Note 8: Peak-to-Peak noise is measured with a single pole highpass filter

at 0.1Hz and a 2-pole lowpass filter at 10Hz. The unit is enclosed in a still

air environment to eliminate thermocouple effects on the leads. The test

time is 10 seconds.

Note 9: Hysteresis in the output voltage is created by package stress that

differs depending on whether the IC was previously at a higher or lower

temperature. Output voltage is always measured at 25

°C, but the IC is

cycled to 85

°C or –40°C before a successive measurement. Hysteresis is

roughly proportional to the square of the temperature change.

Note 10: Temperature coefficient is measured by dividing the change in

output voltage by the specified temperature range.

Note 11: This feature guarantees the shunt mode operation of the device.

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