ISL78227

FN8808 Rev.6.02

Page 10 of 43

Feb 28, 2025

POWER-ON RESET (For both PVCC and VCC)

Rising VVCC POR Threshold

VPORH_VCC

4.35

4.50

4.75

V

Falling VVCC POR Threshold

VPORL_VCC

4.05

4.15

4.25

V

VVCC POR Hysteresis

VPORHYS_VCC

0.4

V

Rising VPVCC POR Threshold

VPORH_PVCC

4.35

4.50

4.75

V

Falling VPVCC POR Threshold

VPORL_PVCC

3.0

3.2

3.4

V

VPVCC POR Hysteresis

VPORHYS_PVCC

1.3

V

Soft-Start Delay

tSS_DLY

From POR rising to initiation of soft-start.

RFSYNC = 61.9k, fSW = 200kHz, PLLCOMP

pin network of RPLL = 3.24k,

CPLL1 = 6.8nF, and CPLL2 = 1nF

0.85

ms

EN

Enable Threshold

VENH

EN Rising

1.13

1.21

1.33

V

VENL

EN Falling

0.85

0.95

1.10

V

VEN_HYS

Hysteresis

250

mV

Input Impedance

EN = 4V

2

6

MΩ

PWM SWITCHING FREQUENCY

PWM Switching Frequency (Per Phase)

FOSC

RFSYNC = 249kΩ (0.1%)

46.0

50.2

54.5

kHz

RFSYNC = 82.5kΩ (0.1%)

142

150

156

kHz

RFSYNC = 40.2kΩ (0.1%)

290

300

310

kHz

RFSYNC = 10kΩ (0.1%)

990

1100

1170

kHz

Minimum Adjustable Switching Frequency

50

kHz

Maximum Adjustable Switching Frequency

1100

kHz

FSYNC Pin Voltage

0.5

V

Minimum ON-Time (Blanking Time) on LGx

tMINON_1

Minimum duty cycle, CUG = CLG = OPEN

RBLANK = 80kΩ (0.1%)

315

410

525

ns

tMINON_2

Minimum duty cycle, CUG = CLG = OPEN

RBLANK = 50kΩ (0.1%)

175

260

325

ns

tMINON_3

Minimum duty cycle, CUG = CLG = OPEN

RBLANK = 25kΩ (0.1%)

100

140

180

ns

tMINON_4

Minimum duty cycle, CUG = CLG = OPEN

RBLANK = 10k

75

90

105

ns

Maximum Duty Cycle

DMAX

DMAX = T_LG_ ON/tSW, VCOMP = 3.5V,

fSW = 300kHz, RDT = 18.2kΩ, CUG = OPEN,

CLG = OPEN

88.5

89.0

90.5

%

SYNCHRONIZATION (FSYNC PIN)

Minimum Synchronization Frequency at

FSYNC Input

50

kHz

Maximum Synchronization Frequency at

FSYNC Input

1100

kHz

Input High Threshold

VIH

3.5

V

Input Low Threshold

VIL

1.5

V

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