ISL78225 datasheet(7/21 Pages) INTERSIL

Part #	ISL78225

Description	4-Phase Interleaved Boost PWM Controller with Light Load Efficiency Enhancement

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Manufacturer	INTERSIL [Intersil Corporation]

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ISL78225

7

FN7909.0

December 15, 2011

Absolute Maximum Ratings

Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND-0.3V to +45V

All ISEN_ Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIN-5V to VIN+0.3V

VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND-0.3V to +6V

All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND-0.3V to VCC+0.3V

ESD Rating

Human Body Model (Tested per JESD22-A114E) . . . . . . . . . . . . . . .2.5kV

Machine Model (Tested per JESD-A115-A) . . . . . . . . . . . . . . . . . . . 200V

Charge Device Model (Tested per JESD22-C101C). . . . . . . . . . . . . 1.5kV

Latch Up (Tested per JESD78B, Class II, Level A) . . . . . . . . . . . . . . . 100mA

Thermal Information

Thermal Resistance (Typical)

θJA (°C/W) θJC (°C/W)

44 Ld EP-TQFP Package (Notes 4, 5) . . . . . .

28

2.5

Maximum Junction Temperature . . . . . . . . . . +150°C

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

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

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

Operating Conditions

Voltage at VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5.6V to +40V

All ISEN_ Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIN-5V to VIN+0.3V

Voltage at VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+5V ±5%

Ambient Temperature (Auto) . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C

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:

4.

θJA 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.

5. For

θJC, the “case temp” location is the center of the exposed metal pad on the package underside.

Electrical Specifications Operating Conditions: VIN = 12V, TA = -40°C to +125°C, unless otherwise specified. Typical specifications are

at TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +125°C.

PARAMETER

TEST CONDITIONS

MIN

(Note 6)

TYP

MAX

(Note 6)

UNITS

SUPPLY INPUT

Input Voltage Range

5.6

12

40

V

Input Supply Current (Normal Mode)

VIN = 12V, RFS = 158kΩ (For fS = 250kHz), EN = 5V

8

12

mA

Input Supply Current (Shutdown Mode)

VIN = 12V, RFS = 158kΩ (For fS = 250kHz), EN = 0V

10

µA

INTERNAL LINEAR REGULATOR

LDO Output Voltage (VCC Pin)

VIN > 5.6V, CL = 4.7µF from VCC to GND, IVCC < 50mA

4.75

5

5.25

V

LDO Current Limit (VCC pin)

VCC = 3V, CL = 4.7µF from VCC to GND

200

(Note 7)

mA

POWER-ON RESET (POR) AND ENABLE

POR Threshold

VCC Rising

4.4

4.5

4.6

V

VCC Falling

4.1

4.2

4.3

V

EN Threshold

Rising

1.1

1.2

1.3

V

Hysteresis

70

mV

OSCILLATOR

Accuracy of Switching Frequency Setting

RFS = 158kΩ from FS to GND

225

250

275

kHz

Adjustment Range of Switching Frequency

75

1000

kHz

FS pin voltage

1V

SOFT-START

Soft-Start Current

CSS = 2.2nF from SS to GND

4

5

6

µA

Soft-Start Pre-Bias Voltage Range

02

V

Soft-Start Pre-Bias Voltage Accuracy

VFB = 500mV

-25

25

mV

Soft-Start Clamp Voltage

3.4

V

REFERENCE VOLTAGE

System Accuracy

-40°C to +125°C, measure at FB pin, VREF2 > 2.5V

1.98

2

2.02

V

FB Pin Input Bias Current

VFB = 2V, VREF2 > 2.5V

-1

1

µA

VREF2 Pin Input Bias Current

VREF2 = 1.6V

-1

1

µA

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