LTC1267CG-ADJ5 Ver la hoja de datos (PDF) - Linear Technology

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LTC1267CG-ADJ5

Dual High Efficiency Synchronous Step-Down Switching Regulators

Linear Technology 

LTC1267

LTC1267-ADJ/LTC1267-ADJ5

ELECTRICAL CHARACTERISTICS

TA = 25°C, VIN = 12V, VMSHDN, VSHDN1,3,5 = 0V (Note 2), unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

VFB1, 2

Feedback Voltage

LTC1267-ADJ, LTC1267-ADJ5: VIN = 9V

q

IFB1, 2

Feedback Current

LTC1267-ADJ, LTC1267-ADJ5

q

VOUT

Regulated Output Voltage

3.3V Output

5V Output

LTC1267: VIN = 9V, ILOAD = 700mA

q

LTC1267, LTC1267-ADJ5: VIN = 9V, ILOAD = 700mA

q

∆VOUT

Output Voltage Line Regulation VIN = 9V to 40V

Output Voltage Load Regulation Figure 1 Circuit

3.3V Output

5mA < ILOAD < 2.0A

q

5V Output

5mA < ILOAD < 2.0A

q

Burst Mode Output Ripple

ILOAD = 0A

VCC

Internal Regulator Voltage

VIN = 12V to 40V, EXT VCC = 0V, ICC = 10mA

q

VIN – VCC VCC Dropout Voltage

VIN = 4V, EXT VCC = Open, ICC = 10mA

IEXTVCC

EXT VCC Pin Current (Note 3)

EXT VCC = 5V, Sleep Mode

IIN

VIN Pin Current (Note 3)

Normal

VIN = 12V, EXT VCC = 5V

VIN = 40V, EXT VCC = 5V

Shutdown

VIN = 12V, VMSHDN = 2V

VIN = 40V, VMSHDN = 2V

VEXTVCC –

VCC

EXT VCC Switch Drop

VIN = 12V, EXT VCC = 5V, ISWITCH = 10mA

VPGATE – PGate to Source Voltage (Off)

VIN = 12V

VIN

VIN = 40V

VVSSEENNSSEE+–11,,

2

2

–

Current Sense Threshold Voltage

LTC1267-ADJ, LTC1267-ADJ5

VSENSE

VSENSE

–

–1,

1,

2

2

=

=

5.1V,

4.9V,

VFB1,

VFB1,

2

2

=

=

VOUT/4

VOUT/4

+

–

25mV

25mV

(Forced)

(Forced)

q

VVSSEENNSSEE+–33,,

5

5

–

Current Sense Threshold Voltage

LTC1267

VSENSE

VSENSE

–

–

3,

3,

5

5

=

=

VOUT

VOUT

+

–

100mV

100mV

(Forced)

(Forced)

q

VSHDN

Shutdown Threshold

MSHDN

SHDN1, 3, 5

IMSHDN

ICT

tOFF

tr, tf

MSHDN Input Current

CT Pin Discharge Current

Off-Time (Note 4)

Driver Output Transition Times

VMSHDN = 5V

VOUT in Regulation

VOUT = 0V

CT = 390pF, ILOAD = 700mA, VIN = 10V

CL = 3000pF (PDrive and NGate Pins), VIN = 6V

MIN TYP MAX

1.21 1.25 1.29

0.2 1

3.23 3.33 3.43

4.90 5.05 5.20

– 40 0

40

40 65

60 100

50

4.25 4.5 4.75

200 300

360

320

550

15

25

200 300

– 0.2 0

– 0.2 0

25

135 160 180

25

135 160 180

0.8 1.4 2.0

0.6 0.8 2.0

12 20

50 70 90

2

10

4

5

6

100 200

UNITS

V

µA

V

V

mV

mV

mV

mVP-P

V

mV

µA

µA

µA

µA

µA

mV

V

V

mV

mV

mV

mV

V

V

µA

µA

µA

µs

ns

3

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