Data Sheet
ISL85410
7
FN8375.5
July 24, 2014
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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 I
SINK
= 3mA, EN = V
CC
, V
FB
= 0V 0.05 0.3 V
TRACKING AND SOFT-START
Soft-Start Charging Current I
SS
4.2 5.5 6.5 µA
Internal Soft-Start Ramp Time EN/SS = V
CC
1.5 2.4 3.4 ms
FAULT PROTECTION
Thermal Shutdown Temperature T
SD
Rising threshold 150 °C
T
HYS
Hysteresis 20 °C
Current Limit Blanking Time t
OCON
17 Clock
pulses
Overcurrent and Auto Restart Period t
OCOFF
8 SS cycle
Positive Peak Current Limit IPLIMIT (Note 7
) 1.3 1.5 1.7 A
PFM Peak Current Limit I
PK_PFM
0.34 0.4 0.5 A
Zero Cross Threshold 15 mA
Negative Current Limit INLIMIT (Note 7
) -0.67 -0.6 -0.53 A
POWER MOSFET
High-side R
HDS
I
PHASE
= 100mA, V
CC
= 5V 250 350 mΩ
Low-side R
LDS
I
PHASE
= 100mA, V
CC
= 5V 90 130 mΩ
PHASE Leakage Current EN = PHASE = 0V 300 nA
PHASE Rise Time t
RISE
V
IN
= 36V 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/36V -0.5 0.5 µA
SYNC Logic Input Leakage Current SYNC = 0V 10 100 nA
SYNC = 5V 1.0 1.55 µA
NOTES:
6. Test Condition: V
IN
= 36V, FB forced above regulation point (0.6V), no switching, and power MOSFET gate charging current not included.
7. Established by both current sense amplifier gain test and current sense amplifier output test at I
L
= 0A.
8. 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.
9. Minimum On-Time required to maintain loop stability.
Electrical Specifications T
A
= -40°C to +125°C, V
IN
= 3V to 36V, unless otherwise noted. Typical values are at T
A
= +25°C. Boldface
limits apply across the junction temperature range, -40°C to +125°C (Continued)
PARAMETER SYMBOL TEST CONDITIONS
MIN
(Note 8
)TYP
MAX
(Note 8)UNITS