LTC3705IGN datasheet(3/20 Pages) LINER

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LTC3705

3705fb

The

● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = VBOOST = 12V, GND = PGND = VTS = 0V, TA = 25°C, unless

otherwise noted.

ELECTRICAL CHARACTERISTICS

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: Operating junction temperature TJ (in °C) is calculated from the

ambient temperature TA and the average power dissipation PD (in watts)

by the formula: TJ = TA + θJA • PD. Refer to the Applications Information

section for details.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IHUVLO

Hysteresis Current

VUVLO = 1V

●

4.2

4.9

5.6

µA

VUVLOOP

Voltage Feedforward Operating Range

Primary-Side Control

VUVLOF(MIN)

3.75

Gate Drivers (TG and BG)

ROS

Output Pull-Down Resistance

IOUT = 100mA

1.9

Ω

VOH

High Output Voltage

IOUT = –100mA

IPU

Peak Pull-Up Current

1.7

Output Rise Time

10% to 90%, COUT = 4.7nF

Output Fall Time

10% to 90%, COUT = 4.7nF

Rectifier

IRECT

Maximum Rectifier DC Output Current

Oscillator

fOSC(P)

Oscillator Frequency

Primary-Side Control, RFS(P) = 100kΩ

200

kHz

Primary-Side Control, RFS(P) = 25kΩ

700

kHz

Primary-Side Control, RFS(P) = 300kΩ

kHz

∆fRFS(P)

Oscillator Resistor Set Accuracy

Primary-Side Control

25k < RFSET < 300k

±15

fOSC(S)

Oscillator Frequency

Secondary-Side Control (During Start-Up),

300

kHz

RFS(S) = 100kΩ

Soft-Start/Fault (SSFLT)

ISS(C)

Soft-Start Charge Current

Primary-Side Control, VSSFLT = 2V

–5.2

µA

Secondary-Side Control, VUVLO = 1.3V,

–4

µA

VSSFLT = 2V

Secondary-Side Control, VUVLO = 3.75V,

–1.6

µA

VSSFLT = 2V

VLRTO

Linear Regulator Time Out-Threshold

3.9

VFLTH

Fault Output High

VCC = 8V

6.7

ISS(D)

Soft-Start Discharge Current

Timing Out After Fault, VSSFLT = 2V

µA

Current Sense Input (IS)

VIS(MAX)

Overcurrent Threshold

300

Volt Second Limit (VSLMT)

VVSL(MAX)

Volt-Second Limit Threshold

1.26

IVSLMT(MAX)

Maximum Volt-Second Limit Resistor Current

0.25

Optoisolator Bias Current

VOPTO

Open Circuit Optoisolator Voltage

Primary-Side Control IFB = 0V

3.3

IOPTO

Optoisolator Bias Current

Primary-Side Control VFB = 2.5V

0.5

Primary-Side Control VFB = 0V

1.6

Note 3: ICC is the sum of current into NDRV and VCC.

Note 4: The LTC3705EGN is guaranteed to meet performance

specifications from 0

°C to 85°C. Specifications over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls. The LTC3705IGN is

guaranteed and tested over the – 40

°C to 85°C operating temperature

range.

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