LTC1148 查看數據表（PDF） - Linear Technology

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LTC1148

High Efficiency Synchronous Step-Down Switching Regulators

Linear Technology 

LTC1148

LTC1148-3.3/LTC1148-5

ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 10V, VSHUTDOWN = 0V, unless otherwise noted.

SYMBOL

V8 – V7

V10

I10

I4

tOFF

tR, tF

PARAMETER

Current Sense Threshold Voltage

LTC1148, LTC1148HV, LTC1148L

LTC1148-3.3, LTC1148HV-3.3

LTC1148L-3.3

LTC1148-5, LTC1148HV-5

Shutdown Pin Threshold

Shutdown Pin Input Current

CT Pin Discharge Current

Off Time (Note 5)

Driver Output Transition Times

CONDITIONS

MIN TYP MAX

VSENSE– = 5V, V9 = VOUT/4 + 25mV (Forced)

25

VSENSE– = 5V, V9 = VOUT/4 – 25mV (Forced) q 130 150 170

VSENSE– = VOUT + 100mV (Forced)

VSENSE– = VOUT – 100mV (Forced)

25

q 130 150 170

VSENSE– = VOUT + 100mV (Forced)

VSENSE– = VOUT – 100mV (Forced)

25

q 130 150 170

0.5 0.8 2

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

VOUT in Regulation, VSENSE – = VOUT

VOUT = 0V

CT = 390pF, ILOAD = 700mA

CL = 3000pF (Pins 1, 14), VIN = 6V

1.2 5

50 70 90

2

10

4

5

6

100 200

UNITS

mV

mV

mV

mV

mV

mV

V

µA

µA

µA

µs

ns

– 40°C ≤ TA ≤ 85°C (Note 5), VIN = 10V, unless otherwise noted.

SYMBOL

V9

∆VOUT

IQ

V8 – V7

V10

tOFF

PARAMETER

CONDITIONS

Feedback Voltage (LTC1148, LTC1148HV

LTC1148L)

VIN = 9V

Regulated Output Voltage

VIN = 9V

LTC1148-3.3, LTC1148HV-3.3, LTC1148L-3.3 ILOAD = 700mA

LTC1148-5, LTC1148HV-5

ILOAD = 700mA

Input DC Supply Current (Note 3)

LTC1148 Series

Normal Mode

Sleep Mode

Sleep Mode

Shutdown

LTC1148HV Series

Normal Mode

Sleep Mode

Sleep Mode

Shutdown

LTC1148L Series

Normal Mode

Sleep Mode

Shutdown

(Note 7)

4V < VIN < 12V

4V < VIN < 12V

6V < VIN < 12V

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

4V < VIN < 18V

4V < VIN < 18V

6V < VIN < 18V

VSHUTDOWN = 2.1V, 4V < VIN < 18V

3.5V < VIN < 12V

3.5V < VIN < 12V

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

Current Sense Threshold Voltage

LTC1148, LTC1148HV, LTC1148L (Note 4)

VSENSE– = 5V, V9 = VOUT/4 – 25mV (Forced)

VSENSE– = 5V, V9 = VOUT/4 + 25mV (Forced)

LTC1148-3.3, LTC1148HV-3.3, LTC1148L-3.3 VSENSE– = VOUT + 100mV (Forced)

VSENSE– = VOUT – 100mV (Forced)

LTC1148-5, LTC1148HV-5

VSENSE– = VOUT + 100mV (Forced)

VSENSE– = VOUT – 100mV (Forced)

Shutdown Pin Threshold

Off Time (Note 5)

CT = 390pF, ILOAD = 700mA

MIN TYP MAX UNITS

1.20 1.25 1.30

V

3.17 3.33 3.43

V

4.85 5.05 5.20

V

1.6 2.4

mA

160 260

µA

160 260

µA

10 22

µA

1.6 2.6

mA

160 280

µA

160 280

µA

10 24

µA

1.6 2.4

mA

160 260

µA

10 22

µA

25

mV

125 150 175

mV

25

mV

125 150 175

mV

25

mV

125 150 175

mV

0.55 0.8 2

V

3.8 5

6

µs

3

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