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LT3845

High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency

Linear Technology 

LT3845

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 20V, VCC = BOOST = BURST_EN = 10V, SHDN = 2V, RSET = 49.9kΩ,

SENSE– = SENSE+ = 10V, SGND = PGND = SW = SYNC = 0V, unless otherwise noted.

PARAMETER

VIN Operating Voltage Range (Note 4)

VIN Minimum Start Voltage

VIN UVLO Threshold (Falling)

VIN UVLO Threshold Hysteresis

VIN Supply Current

VIN Burst Mode Current

VIN Shutdown Current

BOOST Operating Voltage Range

BOOST Operating Voltage Range (Note 5)

BOOST UVLO Threshold (Rising)

BOOST UVLO Threshold Hysteresis

BOOST Supply Current (Note 6)

BOOST Burst Mode Current

BOOST Shutdown Current

VCC Operating Voltage Range (Note 5)

VCC Output Voltage

VCC UVLO Threshold (Rising)

VCC UVLO Threshold Hysteresis

VCC Supply Current (Note 6)

VCC Burst Mode Current

VCC Shutdown Current

VCC Current Limit

Error Amp Reference Voltage

VFB Pin Input Current

SHDN Enable Threshold (Rising)

SHDN Threshold Hysteresis

Sense Pins Common Mode Range

Current Limit Sense Voltage

Reverse Protect Sense Voltage

Reverse Current Inhibit Offset

Input Current (ISENSE+ + ISENSE–)

Operating Frequency

Minimum Programmable Frequency

Maximum Programmable Frequency

External Sync Frequency Range

CONDITIONS

VCC > 9V

VBURST_EN = 0V, VFB = 1.35V

VSHDN = 0V

VBOOST – VSW

VBOOST – VSW

VBOOST – VSW

VBURST_EN = 0V

VSHDN = 0V

Over Full Line and Load Range

VBURST_EN = 0V

VSHDN = 0V

Measured at VFB Pin

VFB = 1.231V

VVSSEENNSSEE++

–

–

VVSSEENNSSEE––,

VBURST_EN

=

VCC

VBURST_EN = 0V or VBURST_EN = VFB

VSENSE(CM) = 0V

VSENSE(CM) = 2V

VSENSE(CM) > 4V

MIN

●

4

●

● 3.6

●

●

●

●

●

●

● –40

1.224

● 1.215

● 1.3

●

0

● 90

● 270

●

● 500

● 100

TYP

3.8

670

20

20

9

5

400

1.4

0.1

0.1

8

6.25

500

3

100

20

–150

1.231

25

1.35

120

100

–100

10

800

–20

–300

300

MAX

60

7.5

4

15

75

20

20

8.3

3.7

1.238

1.245

1.4

36

115

330

100

600

UNITS

V

V

V

mV

μA

μA

μA

V

V

V

mV

mA

μA

μA

V

V

V

mV

mA

μA

μA

mA

V

V

nA

V

mV

V

mV

mV

mV

μA

μA

μA

kHz

kHz

kHz

kHz

SYNC Input Resistance

SYNC Voltage Threshold

40

kΩ

●

1.4

2

V

Soft-Start Capacitor Control Current

Error Amp Transconductance

2

μA

● 270

340

410

μS

Error Amp DC Voltage Gain

62

dB

Error Amp Sink/Source Current

±30

μA

3845fd

3

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