LTC1159CG-3.3 datasheet(3/20 Pages) LINER

Part #	LTC1159CG-3.3

Description	High Efficiency Synchronous Step-Down Switching Regulators

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Manufacturer	LINER [Linear Technology]

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LTC1159

LTC1159-3.3/LTC1159-5

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC

Internal Regulator Voltage

VIN = 12V to 40V, EXTVCC = 0V, ICC = 10mA

q

4.25

4.5

4.75

V

VIN – VCC

VCC Dropout Voltage

VIN = 4V, EXTVCC = Open, ICC = 10mA

300

400

mV

VEXT – VCC

EXTVCC Switch Drop

VIN = 12V, EXTVCC = 5V, ISWITCH = 10mA

250

350

mV

VP-GATE – VIN P-Gate to Source Voltage (Off)

VIN = 12V

– 0.2

0

V

VIN = 40V

– 0.2

0

V

VSENSE+ –

Current Sense Threshold Voltage

VSENSE–

LTC1159

VSENSE– = 5V, VFB = 1.32V (Forced)

25

mV

VSENSE– = 5V, VFB = 1.15V (Forced)

q

130

150

170

mV

LTC1159-3.3

VSENSE– = 3.4V (Forced)

25

mV

VSENSE– = 3.1V (Forced)

q

130

150

170

mV

LTC1159-5

VSENSE– = 5.2V (Forced)

25

mV

VSENSE– = 4.7V (Forced)

q

130

150

170

mV

VSNDN1

SHDN1 Threshold

LTC1159CG, LTC1159-3.3, LTC1159-5

0.5

0.8

2

V

VSHDN2

SHDN2 Threshold

0.8

1.4

2

V

ISHDN2

Shutdown 2 Input Current

VSHDN2 = 5V

12

20

µA

ICT

CT Pin Discharge Current

VOUT in Regulation

50

70

90

µA

VOUT = 0V

2

10

µA

tOFF

Off-Time (Note 5)

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

4

5

6

µs

tr, tf

Driver Output Transition Times

CL = 3000pF (Pins P-Drive and N-Gate), VIN = 6V

100

200

ns

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VFB

Feedback Voltage (LTC1159 Only)

1.2

1.25

1.3

V

VOUT

Regulated Output Voltage

VIN = 9V

LTC1159-3.3

ILOAD = 700mA

3.17

3.30

3.43

V

LTC1159-5

ILOAD = 700mA

4.85

5.05

5.25

V

IIN

VIN Pin Current (Note 4)

Normal

VIN = 12V, EXTVCC = 5V

200

µA

VIN = 40V, EXTVCC = 5V

300

µA

Shutdown

VIN = 12V, VSHDN2 = 2V

15

µA

VIN = 40V, VSHDN2 = 2V

25

µA

IEXTVCC

EXTVCC Pin Current (Note 4)

EXTVCC = 5V, Sleep Mode

250

µA

VCC

Internal Regulator Voltage

VIN = 12V to 40V, EXTVCC = 0V, ICC = 10mA

4.5

V

VSENSE+ –

Current Sense Threshold Voltage

Low Threshold (Forced)

25

mV

VSENSE–

High Threshold (Forced)

125

150

175

mV

VSHDN2

SHDN2 Threshold

0.8

1.4

2

V

tOFF

Off-Time (Note 5)

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

3.5

5

6.5

µs

–40

°C ≤ TA ≤ 85°C (Note 6)

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formulas:

LTC1159CG, LTC1159CG-3.3, LTC1159CG-5: TJ = TA + (PD • 135°C/W)

LTC1159CN, LTC1159CN-3.3, LTC1159CN-5: TJ = TA + (PD • 80°C/W)

LTC1159CS, LTC1159CS-3.3, LTC1159CS-5: TJ = TA + (PD • 110°C/W)

Note 3: On LTC1159 versions which have a SHDN1 pin, it must be at

ground potential for testing.

Note 4: The LTC1159 VIN and EXTVCC current measurements exclude

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

EXTVCC, the input current increases by (IGATECHG • Duty Cycle)/(Efficiency).

See Typical Performance Characteristics and Applications Information.

Note 5: In applications where RSENSE is placed at ground potential, the off-

time increases approximately 40%.

ELECTRICAL C

C

HARA TERISTICS The q denotes specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VSHDN1 = 0V (Note 3), unless otherwise noted.

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