LTC1267 datasheet(4/16 Pages) LINER

4 / 16 page

LTC1267

LTC1267-ADJ/LTC1267-ADJ5

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VFB1, 2

Feedback Voltage

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

1.2

1.25

1.3

VOUT

Regulated Output Voltage

VIN = 9V

3.3V Output

ILOAD = 700mA

3.17

3.30

3.48

5V Output

ILOAD = 700mA

4.85

5.05

5.25

IIN

VIN Pin Current (Note 3)

Normal

VIN = 12V, EXT VCC = 5V

320

µA

VIN = 40V, EXT VCC = 5V

550

µA

Shutdown

VIN = 12V, VMSHDN = 2V

µA

VIN = 40V, VMSHDN = 2V

µA

IEXTVCC

EXT VCC Pin Current (Note 3)

EXT VCC = 5V, Sleep Mode

360

µA

VCC

Internal Regulator Voltage

VIN = 12V to 40V, EXT VCC = 0V, ICC = 20mA

4.5

VSENSE

+ –

Current Sense Threshold Voltage

Low Threshold (Forced)

VSENSE

–

High Threshold (Forced)

130

160

185

VMSHDN

Shutdown Threshold MSHDN

0.8

1.4

2.0

tOFF

Off-Time (Note 4)

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

µs

ELECTRICAL C

HARA TERISTICS

–40

°C ≤ TA ≤ 85°C, VIN = 12V, VMSHDN, VSHDN1,3,5 = 0V (Notes 2, 5), unless otherwise noted.

The q denotes specifications which apply over the full operating

temperature range.

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

dissipation PD according to the following formula:

LTC1267/LTC1267-ADJ/LTC1267ADJ5: TJ = TA + (PD × 95°C/W)

Note 2: On LTC1267 versions which have MSHDN and SHDN1, 3, 5 pins,

they must be at ground potential for testing.

Note 3: The LTC1267 VIN and EXT VCC current measurements exclude

MOSFET driver currents. When VCC power is derived from the output via

EXT VCC, the input current increases by (IGATECHG × Duty Cycle)/Efficiency.

See Typical Performance Characteristics and Applications Information.

Note 4: In applications where RSENSE is placed at ground potential, the

off-time increases approximately 40%.

Note 5: The LTC1267/LTC1267-ADJ/LTC1267-ADJ5 are not tested and

quality-assurance sampled at – 40

°C to 85°C. These specifications are

guaranteed by design and/or correlation.

Note 6: The logic level power MOSFETs shown in Figure 1 are rated for

VDS(MAX) = 30V. For operation at VIN > 30V, use standard threshold

MOSFETs with EXT VCC powered from a 9V supply. See applications

information.

Note 7: LTC1267-ADJ and LTC1267-ADJ5 are tested at an output of 3.3V

TYPICAL PERFORMANCE CHARACTERISTICS

LOAD CURRENT (A)

0.01

100

0.1

LTC1267 • G01

VIN = 10V

VIN = 20V

5V Output Efficiency

vs Load Current

LOAD CURRENT

–60

–50

–30

–20

–10

1.0

2.0

2.5

LTC1267 • G03

–40

0.5

1.5

VIN = 10V

VOUT = 3.3V

VIN = 20V

VOUT = 3.3V

VIN = 10V

VOUT = 5V

VIN = 20V

VOUT = 5V

Load Regulation

LOAD CURRENT (A)

0.01

100

0.1

LTC1267 • G02

VIN = 10V

VIN = 20V

3.3V Output Efficiency

vs Load Current

LTC1267 Datasheet(PDF) 4 Page - Linear Technology

LTC1267 Datasheet(HTML) 4 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Datasheet Download

Link URL