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ISL8500

2A Standard Buck PWM Regulator

Renesas Electronics 

ISL8500

Absolute Maximum Ratings (Note 1)

VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 26V

BOOT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 33V

BOOT to PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.03V to 6V

VDD, FB, EN, COMP, PG, SS . . . . . . . . . . . . . . . . . . . . -0.3V to 6V

Recommended Operating Conditions

VIN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . 4.5V to 25V

Load Current Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 2A

Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . -40°C to +85°

Thermal Information

Thermal Resistance

JA (°C/W) JC (°C/W)

QFN Package (Notes 1, 2). . . . . . . . . .

39

3

Ambient Temperature Range. . . . . . . . . . . . . . . . . . .-40°C to +85°C

Junction Temperature Range. . . . . . . . . . . . . . . . . .-40°C to +125°C

Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C

Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below

http://www.intersil.com/pbfree/Pb-FreeReflow.asp

CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and

result in failures not covered by warranty.

NOTES:

1. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See

Tech Brief TB379 for details.

2. For JC, the “case temp” location is the center of the exposed metal pad on the package underside. See Tech Brief TB379 for details.

3. Test Condition: VIN = 15V, FB forced above regulation point (0.6V), no switching, and power MOSFET gate charging current not included.

4. Excluding the blanking time.

5. Specifications at -40°C to +85°C are established by +25°C test with margin limits.

Electrical Specifications

PARAMETER

Unless Otherwise Noted, All Parameter Limits are Established Over the Recommended Operating Conditions

and the Typical Specifications are Measured at the Following Conditions: TA = -40°C To +85°C (Note 5),

VIN = 5.5V to 25V, Unless Otherwise Noted. Typical Values are at TA = +25°C.

SYMBOL

TEST CONDITIONS

MIN TYP MAX UNITS

SUPPLY VOLTAGE

VIN Voltage Range

VIN

5.5

-

25

V

VIN connected to VDD

4.5

5.0

5.5

V

VIN Operating Supply Current

VIN Shutdown Supply Current

POWER-ON RESET

IOP

Note 3

ISD

VIN = 15V, EN = GND

-

2

2.5 mA

-

80

100

µA

VDD POR Threshold

Rising Edge

4.00 4.15 4.30

V

Hysteresis

-

275

-

mV

INTERNAL VDD LDO

VDD Output Voltage Range

REFERENCE

VIN = 5.5V to 25V, IVDD = 0mA to 30mA

4.5 5.00 5.5

V

Reference Voltage

STANDARD BUCK PWM REGULATOR

VFB VIN = 5.5V to 25V, IREF = 0

0.594 0.6 0.606 V

FB Line Regulation

FB Leakage Current

OSCILLATOR AND PWM MODULATOR

IOUT = 0mA, VIN = 5.5V to 25V

VFB = 0.6V

-0.05

-

-50

0

0.05

%

50

nA

Nominal Switching Frequency

Modulator Gain

Peak-to-Peak Sawtooth Amplitude

PWM Ramp Offset Voltage

Maximum Duty Cycle

fSW

AMOD VIN = 12V (AMOD = 8/VIN)

VRAMP VIN = 12V (VP-P = VIN/8)

VOFFSET

DCmax COMP > 4V

450 500 550 kHz

0.65 0.75 0.95 V/V

-

1.3

-

V

0.75 0.8 0.85

V

80

-

-

%

FN6611 Rev 0.00

December 10, 2007

Page 4 of 15

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