LTC1147IS8-5 datasheet(3/16 Pages) LINER

Part #	LTC1147IS8-5

Description	High Efficiency Step-Down Switching Regulator Controllers

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Manufacturer	LINER [Linear Technology]

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LTC1147-3.3

LTC1147-5/LTC1147L

sn1147 1147fds

TA = 25°C, VIN = 10V, VSHDN = 0V, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V5 – V4

Current Sense Threshold Voltage (Note 6)

LTC1147-3.3, LTC1147L-3.3

VSENSE

– = VOUT + 100mV (Forced)

25

mV

VSENSE– = VOUT – 100mV (Forced)

130

150

170

mV

LTC1147–5

VSENSE

– = VOUT + 100mV (Forced)

25

mV

VSENSE– = VOUT – 100mV (Forced)

130

150

170

mV

LTC1147L

VSENSE

– = 5V, V6 = VOUT/4 + 25mV (Forced)

25

mV

VSENSE– = 5V, V6 = VOUT/4 – 25mV (Forced)

130

150

170

mV

V6

SHDN Pin Threshold

LTC1147-3.3/LTC1147-5/LTC1147L-3.3

0.5

0.8

2

V

I6

SHDN Pin Input Current

LTC1147-3.3/LTC1147-5/LTC1147L-3.3

0V < VSHDN < 8V, VIN = 16V

1.2

5

µA

I2

CT Pin Discharge Current

VOUT in Regulation, VSENSE

– = VOUT

50

70

90

µA

VOUT = 0V

2

10

µA

tOFF

Off-Time (Note 3)

CT = 390pF, ILOAD = 700mA

4

5

6

µs

tr, tf

Driver Output Transition Times

CL = 3000pF (Pin 8), VIN = 6V

100

200

ns

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V6

Feedback Voltage (LTC1147L)

VIN = 9V

q

1.20

1.25

1.30

V

VOUT

Regulated Output Voltage

VIN = 9V

LTC1147-3.3/LTC1147L-3.3

ILOAD = 700mA

q

3.17

3.33

3.43

V

LTC1147-5

ILOAD = 700mA

q

4.85

5.05

5.20

V

IQ

Input DC Supply Current (Note 2)

(Note 5)

LTC1147 Series

Normal Mode

4V < VIN < 12V

1.6

2.4

mA

Sleep Mode

4V < VIN < 12V

160

260

µA

Sleep Mode (LTC1147-5)

5V < VIN < 12V

160

260

µA

Shutdown

VSHDN = 2.1V, 4V < VIN < 12V

10

22

µA

LTC1147L Series

Normal Mode

3.5V < VIN < 12V

1.6

2.4

mA

Sleep Mode

3.5V < VIN < 12V

160

260

µA

Shutdown (LTC1147L-3.3)

VSHDN = 2.1V, 3.5V < VIN < 12V

10

22

µA

V5 – V4

Current Sense Threshold Voltage (Note 6)

LTC1147-3.3

VSENSE– = VOUT + 100mV (Forced)

25

mV

VSENSE– = VOUT – 100mV (Forced)

q

125

150

185

mV

LTC1147-5

VSENSE– = VOUT + 100mV (Forced)

25

mV

VSENSE– = VOUT – 100mV (Forced)

q

125

150

185

mV

LTC1147L

VSENSE– = 5V, 6V = VOUT/4 + 25mV (Forced)

25

mV

VSENSE– = 5V, 6V = VOUT/4 – 25mV (Forced)

125

150

185

mV

V6

SHDN Pin Threshold

LTC1147-3.3/LTC1147-5/LTC1147L-3.3

0V < VSHDN < 8V, VIN = 16V

0.5

0.8

2

V

tOFF

Off-Time (Note 3)

CT = 390pF, ILOAD = 700mA

3.8

5

6.5

µs

The q denotes specifications which apply over the full specified

temperature range.

Note 1: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formulas:

LTC1147CN8-3.3/LTC1147CN8-5: TJ = TA + (PD)(110°C/W)

LTC1147LIS/LTC1147IS8/LTC1147LCS/

LTC1147CS8-3.3/LTC1147CS8-5: TJ = TA + (PD)(150°C/W)

Note 2: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information.

Note 3: In applications where RSENSE is placed at ground potential, the off-

time increases approximately 40%.

Note 4: The LTC1147C is guaranteed to meet specified performance from

0

°C to 70°C and is designed, characterized and expected to meet these

extended temperature limits, but is not tested at – 40

°C and 85°C. The

LTC1147I is guaranteed to meet the extended temperature limits.

Note 5: The LTC1147L/LTC1147L-3.3 allow operation to VIN = 3.5V.

Note 6: The LTC1147L is tested with external feedback resistors resulting

in a nominal output voltage of 2.5V.

–40

°C ≤ TA ≤ 85°C (Note 4), VIN = 10V, unless otherwise noted.

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