LTC1504CS8 datasheet(2/12 Pages) LINER

Part #	LTC1504CS8

Description	500mA Low Voltage Step-Down Synchronous Switching Regulator

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC1504

ABSOLUTE MAXIMUM RATINGS

(Note 1)

Supply Voltage (VCC to GND)................................... 10V

Peak Output Current (SW) .......................................

±1A

Input Voltage (All Other Pins) ......... – 0.3V to VCC + 0.3V

Operating Temperature Range ..................... 0

°C to 70°C

Storage Temperature Range ................. – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

PACKAGE/ORDER I FOR ATIO

ORDER PART

NUMBER

1

2

3

4

8

7

6

5

TOP VIEW

COMP

SS

SHDN

FB/SENSE*

IMAX

VCC

SW

GND

S8 PACKAGE

8-LEAD PLASTIC SO

*FB FOR LTC1504CS8, SENSE FOR LTC1504CS8-3.3

LTC1504CS8

LTC1504CS8-3.3

TJMAX = 115°C, θJA = 90°C/W

S8 PART MARKING

1504

15043

Consult factory for Industrial and Military grade parts.

ELECTRICAL CHARACTERISTICS V

CC = 5V, TA = 25°C unless otherwise specified. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC

Minimum Supply Voltage

(Note 7)

q

4V

VFB

Feedback Voltage

LTC1504CS8

q

1.25

1.265

1.28

V

∆VFB

Feedback Voltage PSRR

Figure 1, 4V

≤ VCC ≤ 10V, LTC1504CS8

q

1.1

1.6

%

VSENSE

Sense Pin Voltage

LTC1504CS8-3.3

q

3.20

3.30

3.40

V

∆VSENSE

Sense Voltage PSRR

Figure 1, 4V

≤ VCC ≤ 10V, LTC1504CS8-3.3

q

1.2

1.8

%

ICC

Supply Current

Figure 1, VSHDN = VCC, IOUT = 0 (Note 4)

3

mA

Figure 1, VSHDN = VCC, IOUT = 0, VFB/VSENSE = VCC (Note 4)

q

0.3

0.6

mA

VSHDN = 0V

q

1.0

20

µA

fOSC

Internal Oscillator Frequency

q

150

200

250

kHz

RSW

Internal Switch Resistance

q

1.3

2.0

Ω

VIH

SHDN Input High Voltage

q

2.4

V

VIL

SHDN Input Low Voltage

q

0.8

V

IIN

SHDN Input Current

q

±0.1

±1

µA

VOH

Error Amplifier Positive Swing

Figure 2

q

4.5

4.95

V

VOL

Error Amplifier Negative Swing

Figure 2

q

0.05

0.5

V

IOH, IOL

Error Amplifier Output Current

Figure 2

q

±50

±100

±200

µA

gmV

Error Amplifier Transconductance

(Note 5)

q

350

600

1100

µmho

AV

Error Amplifier DC Gain

(Note 5)

q

40

48

dB

gmI

ILIM Amplifier Transconductance

(Note 6)

1000

2000

3000

µmho

IMAX

IMAX Sink Current

VIMAX = VCC

q

812

16

µA

ISS

Soft Start Source Current

VSS = 0V

q

–8

–12

– 16

µA

tr, tf

Output Switch Rise/Fall Time

q

550

ns

DCMAX

Maximum Duty Cycle

VCOMP = VCC

q

84

90

%

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