LTC1553L View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1553L

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® II Processor

Linear Technology 

TYPICAL PERFORMANCE CHARACTERISTICS

LTC1553L

Oscillator Frequency

vs Temperature

350

340

330

320

310

300

290

280

270

260

250

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1553L G10

Maximum G1 Duty Cycle

vs Temperature

92

OSCILLATOR FREQUENCY = 300kHz

90

88

G1, G2 CAPACITANCE = 1100pF

2200pF

3300pF

86

84

5500pF

7700pF

82

80

78

– 50 – 25

0 25 50 75

TEMPERATURE (°C)

100 125

1553L G13

PVCC Supply Current

vs Gate Capacitance

70

PVCC = 12V

60 TA = 25°C

50

40

30

20

10

0

0

2000

4000

6000

8000

GATE CAPACITANCE (pF)

1553L G16

IMAX Sink Current

vs Temperature

220

210

200

190

180

170

160

150

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1553L G11

VCC Operating Supply Current

vs Temperature

1.2

VCC = 5V

1.1 fOSC = 300kHz

1.0

0.9

0.8

0.7

0.6

0.5

– 50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1553L G14

Soft Start Source Current

vs Temperature

–8

–9

– 10

– 11

– 12

– 13

– 14

– 15

– 50 – 25

0 25 50 75

TEMPERATURE (°C)

100 125

1553L G12

VCC Shutdown Supply Current

vs Temperature

250

225

200

175

150

125

100

75

50

– 50 – 25

0 25 50 75

TEMPERATURE (°C)

100 125

1553L G15

Output Over Current Protection

3.0

2.5 Q1 CASE = 90°C, VOUT = 2.8V

Q1 = 2 × MTD20N03HDL

Q2 = 1 × MTD20N03HDL

2.0 RIMAX = 2.7k, RIFB = 20Ω,

SS CAP = 0.01µF

1.5

1.0

SHORT-CIRCUIT

CURRENT

0.5

0

02

4 6 8 10 12 14 16 18

OUTPUT CURRENT (A)

1553L G17

Transient Response

50mV/DIV

5A/DIV

100µs/DIV

1553L G18

5

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