ISL88550AIRZ datasheet(3/25 Pages) INTERSIL

Part #	ISL88550AIRZ

Description	Synchronous Step-Down Controller with Sourcing and Sinking LDO Regulator

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Manufacturer	INTERSIL [Intersil Corporation]

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3

FN6168.0

October 12, 2005

Absolute Maximum Ratings

Thermal Information

VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +25V

VDD, AVDD, VTTI to GND. . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V

SHDNA#, REFIN to GND. . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V

SS, POK1, POK2, SKIP#, ILIM, FB to GND . . . . . . . . . . -0.3V to 6V

STBY#, TON, REF, UVP/OVP to GND. . . . . . . .-0.3V to AVDD+0.3V

OUT, VTTR to GND . . . . . . . . . . . . . . . . . . . . . .-0.3V to AVDD+0.3V

LGATE to PGND1 . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VDD+0.3V

UGATE to PHASE . . . . . . . . . . . . . . . . . . . . -0.3V to VBOOT +0.3V

BOOT to PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V

PHASE to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2V to +33V

VTT to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VTTI+0.3V

VTTS to GND. . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to AVDD+0.3V

PGND1, PGND2 to GND . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +0.3V

REF Short Circuit to GND. . . . . . . . . . . . . . . . . . . . . . . . .Continuous

Thermal Resistance

θJA (°C/W) θJC (°C/W)

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

31

1.5

Operating Conditions

Junction Temperature Range. . . . . . . . . . . . . . . . . .-55°C to +150°C

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

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

Lead Temperature (Soldering, 10s) . . . . . . . . . . . . . . . . . . . . +300°C

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the

device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

1.

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.

2. For

θJC, the "case temp" location is the center of the exposed metal pad on the package underside. See Tech Brief TB379.

Electrical Specifications

VIN = +15V, VDD = AVDD = SHDNA# = STBY# = BOOT = ILIM = 5V, OUT = REFIN = VTTI = 2.5V,

FB = SKIP# = OVP/UVP = GND. PGND1 = PGND2 = PHASE = GND, VTTS = VTT, TON = OPEN, TA = -40°C

to +85°C, unless otherwise noted. Typical values are at TA = +25°C (Note 3)

Note: Following are target specifications. Final limits may change as a result of characterization.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

MAIN PWM CONTROLLER

VIN Input Voltage Range

225

V

VDD, AVDD Input Voltage Range

4.5

5.5

V

Output Adjust Range

0.7

3.5

V

Output Voltage Accuracy (Note 4)

FB = OUT

0.693

0.7

0.707

V

FB = GND

2.470

2.5

2.53

V

FB = VDD

1.78

1.8

1.82

V

Soft-Start Ramp Time

Rising edge of SHDNA# to full current limit

1.7

ms

ON-Time

VIN = 15V,

VOUT =

1.5V

(Note 5)

TON = GND (600kHz)

170

194

219

ns

TON = REF (450kHz)

213

243

273

ns

TON = OPEN (300kHz)

316

352

389

ns

TON = AVDD (200kHz)

461

516

571

ns

Minimum, OFF-Time

(Note 5)

200

300

450

ns

VIN Quiescent Supply Current

25

40

µA

VIN Shutdown Supply Current

SHDNA# = STBY# = GND

1

5

µA

Combined AVDD and VDD Quiescent Supply

Current

All on (PWM, VTT, & VTTR on), VFB = 0.75V

2.5

5

mA

STBY# = GND (only VTTR & PWM on), VFB = 0.75V

1

2

mA

Combined AVDD and VDD Shutdown Supply

Current

SHDNA# = STBY# = GND

2

10

µA

AVDD Undervoltage Lockout Threshold

Rising edge of AVDD

4.1

4.25

4.4

V

Hysteresis

50

mV

REFERENCE

Reference Voltage

AVDD = 4.5V to 5.5V; IREF = 0 to 130µA

1.98

2

2.02

V

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