5
FN9176.1
February 8, 2005
Absolute Maximum Ratings Thermal Information
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . 8.0V to 18.0V
Logic Input Voltage Range
(SDA, SCL, ENT, DSQIN, SEL18V) . . . . . . . . . . . . . . -0.5V to 7V
Output Current . . . . . . . . . . . . . . . . . . . . Externally/Internally Limited
Thermal Resistance θ
JA
(°C/W) θ
JC
(°C/W)
QFN Package (Notes 1, 2) . . . . . . . . 32 4
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150°C
Maximum Storage Temperature Range . . . . . . . . . . . -40°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300°C
NOTE: The device junction temperature should be kept below
150°C. Thermal shut-down circuitry turns off the device if junction
temperature exceeds +150°C typically.
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. θ
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
2. For θ
JC
, the “case temperature” location is the center of the exposed metal pad on the package underside. See Tech Brief TB379.
Electrical Specifications V
CC
= 12V, T
A
= -20°C to +85°C, unless otherwise noted. Typical values are at T
A
= 25°C. EN = H, LLC = L,
ENT = L, DCL = L, DSQIN = L, I
OUT
= 12mA, unless otherwise noted. See software description section for I
2
C
access to the system.
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage Range 81214 V
Standby Supply Current EN = L - 1.5 3.0 mA
Supply Current I
IN
EN = LLC = VSEL = ENT = H, No Load - 4.0 8.0 mA
UNDERVOLTAGE LOCKOUT
Start Threshold 7.5 - 7.95 V
Stop Threshold 7.0 - 7.55 V
Start to Stop Hysteresis 350 400 500 mV
SOFT-START
COMP Rise Time (Note 2) (Note 4) - 1024 - Cycles
OUTPUT VOLTAGE
Output Voltage (Note 3) V
OUT
VSEL = L, LLC = L 12.74 13.0 13.26 V
V
OUT
VSEL = L, LLC = H 13.72 14.0 14.28 V
V
OUT
VSEL = H, LLC = L 17.64 18.0 18.36 V
V
OOU
VSEL = H, LLC = H 18.62 19.0 19.38 V
Line Regulation DV
OUT
V
IN
= 8V to 14V; V
OUT
= 13V - 4.0 40.0 mV
V
IN
= 8V to 14V; V
OUT
= 18V - 4.0 60.0 mV
Load Regulation DV
OUT
I
O
= 12mA to 450mA - 50 80 mV
Dynamic Output Current Limiting I
MAX
DCL = L, ISEL = L 425 - 550 mA
DCL = L, ISEL = H 775 - 950 mA
Dynamic Overload Protection Off Time TOFF DCL = L, Output Shorted (Note 4) - 900 - ms
Dynamic Overload Protection On Time TON - 20 - ms
22kHz TONE
Tone Frequency f
tone
ENT = H 20.0 22.0 24.0 kHz
Tone Amplitude V
tone
ENT = H 550 680 900 mV
Tone Duty Cycle dc
tone
ENT = H (Note 5) 40 50 60 %
Tone Rise or Fall Time T
r
, T
f
ENT = H 5 8 14 µs
ISL6425
