ISL8502AIRZ View Datasheet(PDF) - Intersil

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Description

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ISL8502AIRZ

2A Synchronous Buck Regulator with Integrated MOSFETs

Intersil 

ISL8502A

Electrical Specifications Refer to “Block Diagram”and “Typical Application Schematics”. Operating conditions unless otherwise noted:

VIN = 12V, or VCC = 5V ±10%, TA = -40°C to +85°C. Typical are at TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +85°C

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

MAX

(Note 6) TYP (Note 6) UNITS

System Accuracy

-1.0

+1.0

%

FB Pin Bias Current

±80 ±200 nA

SOFT-START

Soft-Start Current

ISS

Enable Soft-Start Threshold

20

30

40

µA

0.8

1.0

1.2

V

Enable Soft-Start Threshold Hysteresis

12

mV

Enable Soft-Start Voltage High

2.8

3.2

3.8

V

ERROR AMPLIFIER

DC Gain

88

dB

Gain-Bandwidth Product

GBWP

15

MHz

Maximum Output Voltage

3.9

4.4

V

Slew Rate

SR

5

V/µs

INTERNAL MOSFETS

Upper MOSFET rDS(ON)

Lower MOSFET rDS(ON)

PGOOD

rDS_UPPER

rDS_LOWER

VCC = 5V

VCC = 5V

180

mΩ

90

mΩ

PGOOD Threshold

VFB/VREF

Rising Edge Hysteresis 1%

Falling Edge Hysteresis 1%

107 111 115

%

86

90

93

%

PGOOD Rising Delay (Note 11)

PGOOD Leakage Current

PGOOD Low Voltage

PGOOD Sinking Current

PROTECTION

tPGOOD_DELAY

VPGOOD

IPGOOD

fOSC = 500kHz

VPGOOD = 5.5V

1

ms

5

µA

0.10

V

0.5

mA

Positive Current Limit

IPOC_peak

IOC from VIN to PHASE (Notes 9, 10)

(TA = 0°C to +85°C)

2.1

3.5

4.5

A

IOC from VIN to PHASE (Notes 9, 10)

(TA = -40°C to +0°C)

2.0

3.4

4.0

A

Negative Current Limit

INOC_peak

IOC from PHASE to PGND (Notes 9, 10)

(TA = 0°C to +85°C)

2.2

3.0

3.5

A

IOC from PHASE to PGND (Notes 9, 10)

(TA = -40°C to +85°C)

1.9

2.8

3.7

A

Undervoltage Level

VFB/VREF

76

80

84

%

Thermal Shutdown Setpoint

TSD

150

°C

Thermal Recovery Setpoint

TSR

130

°C

NOTES:

6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization

and are not production tested.

7. Minimum VIN can operate below 5.5V as long as VCC is greater than 4.5V.

8. Maximum VIN can be higher than 14V voltage stress across the upper and lower do not exceed 15.5V in all conditions.

9. Circuit requires 150ns minimum on time to detect overcurrent condition.

10. Limits established by characterization and are not production tested.

11. PGOOD Rising Delay is measured from the point where VOUT reaches regulation to the point where PGOOD rises. It does not include the external

soft-start time. The PGOOD Rising Delay specification is measured at 500kHz.

7

FN7940.0

October 21, 2011

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