ISL854102

FN8870 Rev.1.00

Page 8 of 21

Mar 15, 2019

POWER-GOOD

Lower PG Threshold - VFB Rising

90

94

%

Lower PG Threshold - VFB Falling

82.5

86

%

Upper PG Threshold - VFB Rising

116.5

120

%

Upper PG Threshold - VFB Falling

107

112

%

PG Propagation Delay

Percentage of the soft-start time

10

%

PG Low Voltage

ISINK = 3mA, EN = VCC, VFB = 0V

0.05

0.3

V

TRACKING AND SOFT-START

Soft-Start Charging Current

ISS

4.2

5.5

6.5

µA

Internal Soft-Start Ramp Time

EN/SS = VCC

1.5

2.4

3.4

ms

FAULT PROTECTION

Thermal Shutdown Temperature

TSD

Rising threshold

150

°C

THYS

Hysteresis

20

°C

Current Limit Blanking Time

tOCON

17

Clock

pulses

Overcurrent and Auto Restart Period

tOCOFF

8

SS cycle

Positive Peak Current Limit

IPLIMIT

(Note 8)

1.4

1.6

1.8

A

PFM Peak Current Limit

IPK_PFM

0.34

0.4

0.5

A

Zero Cross Threshold

15

mA

Negative Current Limit

INLIMIT

(Note 8)

-0.67

-0.6

-0.53

A

POWER MOSFET

High-Side

RHDS

IPHASE = 100mA, VCC = 5V

250

350

mΩ

Low-Side

RLDS

IPHASE = 100mA, VCC = 5V

90

130

mΩ

PHASE Leakage Current

EN = PHASE = 0V

300

nA

PHASE Rise Time

tRISE

VIN = 40V

10

ns

EN/SYNC

Input Threshold

Falling edge, logic low

0.4

1V

Rising edge, logic high

1.2

1.4

V

EN Logic Input Leakage Current

EN = 0V/40V

-0.5

0.5

µA

SYNC Logic Input Leakage Current

SYNC = 0V

10

100

nA

SYNC = 5V

1.0

1.55

µA

NOTES:

7. Test condition: VIN = 40V, FB forced above regulation point (0.6V), switching and power MOSFET gate charging current not included.

8. Established by both current sense amplifier gain test and current sense amplifier output test at IL = 0A.

9. 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.

10. Minimum on-time required to maintain loop stability.

Electrical Specifications TA = -40°C to +125°C, VIN = 3V to 40V, unless otherwise noted. Typical values are at TA = +25°C. Boldface

limits apply across the junction temperature range, -40°C to +125°C (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

(Note 9)TYP

MAX

(Note 9)UNIT