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LT8312

8312f

For more information www.linear.com/LT8312

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage Range

Quiescent Current

VEN/UVLO = 0.2V

Not Switching

µA

VIN Quiescent Current, INTVCC Overdriven

VINTVCC = 11V

µA

VIN Shunt Regulator Voltage

I = 1mA

VIN Shunt Regulator Current Limit

INTVCC Quiescent Current

VEN/UVLO = 0.2V

VEN/UVLO = 1.5V, Not Switching

12.5

1.8

15.5

2.2

17.5

2.7

µA

EN/UVLO Pin Threshold

EN/UVLO Pin Voltage Rising

1.21

1.25

1.29

EN/UVLO Pin Hysteresis Current

EN/UVLO = 1V

μA

VREF Voltage

0µA Load

200µA Load

1.97

1.95

2.0

1.98

2.03

SENSE Current Limit Threshold

102

107

Minimum SENSE Current Limit

SENSE Input Bias Current

Current Out of Pin

µA

Current Sense Blanking Time

130

170

FB Voltage

1.22

1.25

1.28

FB Voltage Line Regulation

10V < VIN < 35V

0.01

0.03

%/V

FB Pin Bias Current

(Note 3), FB = 1.25V, OVP = 1.35V

100

600

FB Error Amplifier Voltage Gain

ΔVVC/ΔVFB

180

V/V

FB Error Amplifier Transconductance

ΔI = 5µA

170

µmhos

FB Low Detection Voltage

0.1

DCM Current Turn-On Threshold

Current Out of Pin

µA

Maximum Oscillator Frequency

400

kHz

Linear Regulator

INTVCC Regulation Voltage

9.8

10.4

Dropout (VIN-INTVCC)

IINTVCC = –10mA, VIN = 10V

500

900

Current Limit

INTVCC < 9.5V

INTVCC > 9.5V

120

Gate Driver

tr GATE Driver Output Rise Time

CL = 3300pF

tf GATE Driver Output Fall Time

CL = 3300pF

GATE Output Low (VOL)

0.01

GATE Output High (VOH)

INTVCC –

50mV

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 LT8312E is guaranteed to meet specified performance from

0°C to 125°C junction temperature. Specification over the –40°C and

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

characterization and correlation with statistical process controls. The

LT8312I is guaranteed to meet specified performance from –40°C to

125°C operating junction temperature range. The LT8312H is guaranteed

to meet performance specifications over the –40°C to 150°C operating

junction temperature range. The LT8312MP is guaranteed to meet

performance specifications over the –55°C to 150°C operating junction

temperature range. High junction temperatures degrade operating

lifetimes. Operating lifetime is derated for junction temperatures greater

than 125°C.

Note 3: Current flows out of the FB pin.

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