ISL78235ARZ datasheet(8/20 Pages) INTERSIL

Part #	ISL78235ARZ

Description	5A Automotive Synchronous Buck Regulator

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Manufacturer	INTERSIL [Intersil Corporation]

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ISL78235

8

FN8713.2

July 1, 2015

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FIGURE 11. VOUT REGULATION vs LOAD (VOUT = 1.2V)

FIGURE 12. VOUT REGULATION vs LOAD (VOUT = 1.8V)

FIGURE 13. VOUT REGULATION vs LOAD (VOUT =1.0V)

FIGURE 14. PHASE MINIMUM ON-TIME vs VIN

FIGURE 15. EN START-UP AT NO LOAD (SYNC = GND)

FIGURE 16. EN START-UP AT NO LOAD (SYNC = VDD)

Typical Operating Performance Unless otherwise noted, operating conditions are: T

A = +25°C, VIN =VDD = 5V,

VOUT =1.8V, EN = VDD, SYNC = VDD, L = 0.68µH, fSW = 2MHz, CIN = 2 x 22µF, COUT = 2 x 22µF, IOUT = 0A to 5A. (Continued)

1.179

1.184

1.194

1.199

1.204

1.209

1.214

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

OUTPUT LOAD (A)

4.5

5.0

1.219

1.189

3.3V PWM

5V PFM

5V PWM

3.3V PFM

1.770

1.775

1.785

1.790

1.795

1.800

1.805

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

OUTPUT LOAD (A)

4.5

5.0

1.810

1.780

5V PWM

3.3V PWM

5V PFM

3.3V PFM

0.980

0.985

0.995

1.000

1.005

1.010

1.015

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

OUTPUT LOAD (A)

4.5

5.0

1.020

0.990

3.3V PFM

3.3V PWM

50

55

60

65

70

75

3.0

3.5

4.0

4.5

5.0

5.5

VIN (V)

T = +25°C

T = -40°C

T = +125°C

PHASE 5V/DIV

EN 2V/DIV

PG 5V/DIV

VOUT 1V/DIV

500µs/DIV

SS = GND

COUT = 4x22µF

PHASE 5V/DIV

EN 2V/DIV

PG 5V/DIV

VOUT 1V/DIV

500µs/DIV

SS = GND

COUT = 4x22µF

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