ISL78227

FN8808 Rev.6.02

Page 11 of 43

Feb 28, 2025

Input Minimum Pulse Width - Rise-to-Fall

20

ns

Input Minimum Pulse Width - Fall-to-Rise

20

ns

Delay Time from Input Pulse Rising to LG1

Rising Edge Minus Dead Time tDT1

CLG = OPEN, RDT = 50kΩ

35

ns

Input Impedance

Input impedance before synchronization

mode

1

kΩ

Input impedance after synchronization

mode

200

MΩ

CLKOUT

CLKOUTH

ICLKOUT = 500µA

VCC - 0.5 VCC - 0.1

V

CLKOUTL

ICLKOUT = -500µA

0.1

0.4

V

Output Pulse Width

CCLKOUT = 100pF, tSW is each phase’s

switching period

1/12 * tSW

Phase Shift from LG1 Rising Edge to CLKOUT

Pulse Rising Edge

CLG1 = OPEN, CCLKOUT = OPEN,

fSW = 300kHz, tDT1 = 60ns (refer to

Figure 56 on page 28 for the timing

diagram)

87

°

SOFT-START

Soft-Start Current

ISS

4.5

5.0

5.5

µA

Minimum Soft-Start Pre-Bias Voltage

0

V

Maximum Soft-Start Pre-Bias Voltage

1.6

V

Soft-Start Pre-bias Voltage Accuracy

VFB = 500mV

-25

0

25

mV

Soft-Start Clamp Voltage

VSSCLAMP

3.25

3.47

3.70

V

HICCUP RETRY DELAY (Refer to “Selectable Hiccup or Latch-Off Fault Response” on page 33 for details)

Hiccup Retry Delay

If Hiccup fault response selected

500

ms

REFERENCE VOLTAGE FOR OUTPUT VOLTAGE REGULATION

System Reference Accuracy

Measured at the FB pin

1.576

1.600

1.620

V

FB Pin Input Bias Current

VFB = 1.6V, TRACK = Open

-0.05

0.01

0.05

µA

ERROR AMPLIFIER FOR OUTPUT VOLTAGE REGULATION (Gm1)

Transconductance Gain

2

mA/V

Output Impedance

7.5

MΩ

Unity Gain Bandwidth

CCOMP = 100pF from COMP pin to GND

3.3

MHz

Slew Rate

CCOMP = 100pF from COMP pin to GND

±3

V/µs

Output Current Capability

±300

µA

Maximum Output Voltage

3.5

3.7

V

Minimum Output Voltage

0.1

0.3

V

PWM CORE

SLOPE Pin Voltage

480

500

520

mV

SLOPE Accuracy

RSLOPE = 20k (0.1%)

-20

0

20

%

RSLOPE = 40.2k (0.1%)

-20

3

20

%

Electrical Specifications Refer to Figure 3 on page 7 and Typical Application Schematics (page 8). Operating conditions unless

otherwise noted: VIN = 12V, VPVCC = 5.2V and VVCC = 5.2V, TA = -40°C to +125°C (Note 7). Typical values are at TA = +25°C. Boldface limits apply across

the operating temperature range, -40°C to +125°C. (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

(Note 6)

TYP

MAX

(Note 6) UNIT