ISL78227

FN8808 Rev.6.02

Page 14 of 43

Feb 28, 2025

OUTPUT OVERVOLTAGE DETECTION/PROTECTION MONITOR THE FB PIN, (Refer to “Output Overvoltage Fault Protection” on page 34 for details)

FB Overvoltage Rising Trip Threshold

VFBOV_RISE

Percentage of VREF_1.6V

(Selectable Hiccup/Latch-off response)

118

120

122

%

FB Overvoltage Falling Recovery Threshold

VFBOV_FALL

Percentage of VREF_1.6V

(Selectable Hiccup/Latch-off response)

114

116

118

%

Overvoltage Threshold Hysteresis

4

%

FB Overvoltage Trip Delay

1

µs

OUTPUT UNDERVOLTAGE DETECTION (MONITOR THE FB PIN), (Refer to “Output Undervoltage Indication” on page 34 for details)

Undervoltage Falling Trip Threshold

VFBUVREF_FALL Percentage of VREF_1.6V

78

80

82

%

Undervoltage Rising Recovery Threshold

VFBUVREF_RISE Percentage of VREF_1.6V

82.5

84.0

86.5

%

Undervoltage Threshold Hysteresis

4

%

POWER-GOOD MONITOR (PGOOD PIN)

PGOOD Leakage Current

PGOOD HIGH, VPGOOD = 5V

1

µA

PGOOD Low Voltage

PGOOD LOW, IPGOOD = 0.5mA

0.06

0.40

V

PGOOD Rising Delay (DE Mode)

The PGOOD rising delay from

VSSPIN = VSSPCLAMP (3.47V) and

VREF_TRK ≥ 0.3V to PGOOD HIGH when DE

mode is selected (DE/PHDRP = VCC or

FLOAT)

0.5

ms

PGOOD Rising Delay (CCM Mode)

The PGOOD rising delay from

VSSPIN = VSSPCLAMP (3.47V) and

VREF_TRK ≥ 0.3V to PGOOD HIGH when

CCM mode is selected (DE/PHDRP = GND)

100

ms

PGOOD Falling Blanking Time

10

µs

HIC/LATCH, ATRK/DTRK PIN DIGITAL LOGIC INPUT

Input Leakage Current

EN <1V

-1

1

µA

Input Pull Down Current

EN >2V, pin voltage = 2.1V

0.7

1.0

2.0

µA

Logic Input Low

0.8

V

Logic Input High

2.1

V

DE/PHDRP PIN DIGITAL LOGIC INPUT (HIGH/LOW/FLOAT)

Input Leakage Current

-1

1

µA

Float Impedance - Pin to VCC

Pin = GND

100

200

300

kΩ

Float Impedance - Pin to GND

Pin = VCC

100

200

300

kΩ

Output Voltage on DE/PHDRP Pin

Pin = Float

2.1

2.6

2.7

V

Tri-State Input Voltage MAX

3

V

Tri-State Input Voltage MIN

1.8

V

Logic Input Low

Pin voltage falling

0.7

V

Logic Input High

Pin voltage rising

VCC - 0.4

V

TRACK PIN - DIGITAL INPUT LOGIC

Input Leakage Current

EN <1V, pin voltage = 5V, VCC = 0V

-1

1

µA

Input Pull-Up Current

EN >2V, pin voltage = 0V, VCC = 5V

0.8

1.1

1.5

µA

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