LTC3803 datasheet(2/12 Pages) LINER

2 / 12 page

LTC3803

3803i

ORDER PART

NUMBER

(Note 1)

VCC to GND

Low Impedance Source .......................... – 0.3V to 8V

Current Fed ...................................... 25mA into VCC*

NGATE Voltage ......................................... – 0.3V to VCC

VFB, ITH/RUN Voltages ..............................–0.3V to 3.5V

SENSE Voltage ........................................... – 0.3V to 1V

NGATE Peak Output Current (<10

µs)........................ 1A

Operating Temperature Range (Note 2) .. – 40

°C to 85°C

Junction Temperature (Note 3) ............................ 150

°C

Storage Temperature Range ................. – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

LTC3803ES6

TJMAX = 150°C, θJA = 230°C/W

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VTURNON

VCC Turn On Voltage

7.8

8.7

9.2

VTURNOFF

VCC Turn Off Voltage

4.6

5.7

6.8

VHYST

VCC Hysteresis

VTURNON – VTURNOFF

1.5

3.0

VCLAMP1mA

VCC Shunt Regulator Voltage

ICC = 1mA, VITH/RUN = 0V

8.3

9.4

10.3

VCLAMP25mA

VCC Shunt Regulator Voltage

ICC = 25mA, VITH/RUN = 0V

8.4

9.5

10.5

VMARGIN

VCLAMP1mA – VTURNON Margin

0.05

0.6

ICC

Input DC Supply Current

(Note 4)

Normal Operation

VITH/RUN = 1.3V

240

350

µA

Start-Up

VCC = VTURNON – 100mV

µA

VITHSHDN

Shutdown Threshold (at ITH/RUN)

VCC = VTURNON + 100mV

0.15

0.28

0.45

IITHSTART

Start-Up Current Source

VITH/RUN = 0V

0.2

0.3

0.4

µA

VFB

Regulated Feedback Voltage

°C ≤ TA ≤ 85°C (Note 5)

0.788

0.800

0.812

–40

°C ≤ TA ≤ 85°CC (Note 5)

0.780

0.800

0.812

Error Amplifier Transconductance

ITH/RUN Pin Load = ±5µA (Note 5)

200

333

500

µA/V

∆VO(LINE)

Output Voltage Line Regulation

VTURNOFF < VCC < VCLAMP (Note 5)

0.05

mV/V

∆VO(LOAD)

Output Voltage Load Regulation

ITH/RUN Sinking 5µA (Note 5)

mV/

µA

ITH/RUN Sourcing 5µA (Note 5)

mV/

µA

IFB

VFB Input Current

(Note 5)

fOSC

Oscillator Frequency

VITH/RUN = 1.3V

180

200

240

kHz

DCON(MIN)

Minimum Switch On Duty Cycle

VITH/RUN = 1.3V, VFB = 0.8V

DCON(MAX)

Maximum Switch On Duty Cycle

VITH/RUN = 1.3V, VFB = 0.8V

tRISE

Gate Drive Rise Time

CLOAD = 3000pF

tFALL

Gate Drive Fall Time

CLOAD = 3000pF

VIMAX

Peak Current Sense Voltage

RSL = 0 (Note 6)

100

115

ISLMAX

Peak Slope Compensation Output Current

(Note 7)

µA

tSFST

Soft-Start Time

1.4

The q indicates specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 8V, unless otherwise noted. (Note 2)

S6 PART

MARKING

LTACV

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

ITH/RUN 1

GND 2

VFB 3

6 NGATE

5 VCC

4 SENSE

TOP VIEW

S6 PACKAGE

6-LEAD PLASTIC TSOT-23

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

of a device may be impaired.

Note 2: The LTC3803E is guaranteed to meet specifications from 0

°C to

°C. Specifications over the –40°C to 85°C operating temperature range

are assured by design, characterization and correlation with statistical

process controls.

Note 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

*LTC3803 internal clamp circuit self regulates VCC voltage to 9.5V.

LTC3803 Datasheet(PDF) 2 Page - Linear Technology

LTC3803 Datasheet(HTML) 2 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12

Datasheet Download

Link URL