LTC3801BES6 datasheet(2/12 Pages) LINER

Part #	LTC3801BES6

Description	Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT

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Manufacturer	LINER [Linear Technology]

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LTC3801/LTC3801B

sn3801 3801fs

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage Range

q

2.4

9.8

V

Input DC Supply Current

Typicals at VIN = 4.2V (Note 4)

Normal Operation

2.4V

≤ VIN ≤ 9.8V, VITH/RUN = 1.3V

195

300

µA

SLEEP Mode

2.4V

≤ VIN ≤ 9.8V (LTC3801 Only)

16

30

µA

Shutdown

2.4V

≤ VIN ≤ 9.8V, VITH/RUN = 0V (LTC3801)

6

15

µA

2.4V

≤ VIN ≤ 9.8V, VITH/RUN = 0V (LTC3801B)

8

17

µA

UVLO

VIN < UVLO Threshold

1

2

µA

Undervoltage Lockout Threshold

VIN Rising

q

1.8

2.3

V

VIN Falling

q

1.7

2.2

V

Start-Up Current Source

VITH/RUN = 0V (LTC3801)

0.5

1

1.5

µA

VITH/RUN = 0V (LTC3801B)

1.0

2

3.0

µA

Shutdown Threshold (at ITH/RUN)

VITH/RUN Rising

q

0.3

0.6

0.95

V

Regulated Feedback Voltage

0

°C ≤ TA ≤ 85°C (Note 5)

0.788

0.800

0.812

V

–40

°C ≤ TA ≤ 85°C (Note 5)

q

0.780

0.800

0.812

V

Feedback Voltage Line Regulation

2.4V

≤ VIN ≤ 9.8V (Note 5)

0.05

mV/V

Feedback Voltage Load Regulation

ITH/RUN Sinking 5µA (Note 5)

2

mV/

µA

ITH/RUN Sourcing 5µA (Note 5)

2

mV/

µA

VFB Input Current

(Note 5)

2

10

nA

Overvoltage Protect Threshold

Measured at VFB

0.850

0.880

0.910

V

Overvoltage Protect Hysteresis

40

mV

Oscillator Frequency

Normal Operation

VFB = 0.8V

500

550

650

kHz

Output Short Circuit

VFB = 0V

210

kHz

Gate Drive Rise Time

CLOAD = 3000pF

40

ns

Gate Drive Fall Time

CLOAD = 3000pF

40

ns

Peak Current Sense Voltage

Duty Cycle < 40% (Note 6)

LTC3801

q

109

117

125

mV

LTC3801B

q

95

104

113

mV

Peak Current Sense Voltage in Burst Mode Operation

LTC3801 Only

26

mV

Default Soft-Start Time

0.6

ms

ORDER PART

NUMBER

(Note 1)

Input Supply Voltage (VIN)........................ – 0.3V to 10V

SENSE–, PGATE Voltages ............ – 0.3V to (VIN + 0.3V)

VFB, ITH/RUN Voltages ............................. –0.3V to 2.4V

PGATE 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

LTC3801ES6

LTC3801BES6

TJMAX = 150°C, θJA = 230°C/W

The q indicates specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 4.2V unless otherwise noted. (Note 2)

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

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

ITH/RUN 1

GND 2

VFB 3

6 PGATE

5 VIN

4 SENSE–

TOP VIEW

S6 PACKAGE

6-LEAD PLASTIC TSOT-23

S6 PART MARKING

LTACR

LTAHN

ELECTRICAL CHARACTERISTICS

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

of a device may be impaired.

Note 2: The LTC3801ES6/LTC3801BES6 are guaranteed to meet specifica-

tions from 0

°C to 70°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:

TJ = TA + (PD • θJA°C/W)

Note 4: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

Note 5: The LTC3801/LTC3801B are tested in a feedback loop that servos

VFB to the output of the error amplifier while maintaining ITH/RUN at the

midpoint of the current limit range.

Note 6: Peak current sense voltage is reduced dependent on duty cycle as

given in Figure 1.

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