5
FN9191.2
December 5, 2008
Absolute Maximum Ratings Thermal Information
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . 8.0V to 18.0V
Logic Input Voltage Range
(SDA, SCL, ENT, DSQIN 1 and 2, SEL18V 1 and 2) . .-0.5V to 7V
Thermal Resistance (Typical, Notes 2, 3) θ
JA
(°C/W) θ
JC
(°C/W)
QFN Package. . . . . . . . . . . . . . . . . . . . 38 4.5
TSSOP Package . . . . . . . . . . . . . . . . . 35 2.5
Maximum Junction Temperature (Note 4) . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range. . . . . . . . . .-40°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . . .-20°C to +85°C
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:
2. 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.
3. For θ
JC
, the "case temp" location is the center of the exposed metal pad on the package underside.
4. 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.
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, VTOP
VBOT = L, ENT = L, DCL = L, Iout = 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 = VTOP = VBOT = ENT = H, No Load - 4.0 8.0 mA
UNDERVOLTAGE LOCKOUT
Start Threshold 7.5 - 7.95 V
Stop Threshold 7.0 - 7.6 V
Start to Stop Hysteresis 350 400 500 mV
SOFT-START
COMP Rise Time (Note 5) (Note 5) - 8196 - Cycles
Output Voltage (Note 5) V
O1
(Refer to Table 1) 13.04 13.3 13.56 V
V
O1
(Refer to Table 1) 14.02 14.3 14.58 V
V
O1
(Refer to Table 1) 17.94 18.3 18.66 V
V
O1
(Refer to Table 1) 19.00 19.3 19.68 V
Line Regulation DV
O1,
DV
O2
V
IN
= 8V to 14V; V
O
= 13.3V - 4.0 40.0 mV
V
IN
= 8V to 14V; V
O
= 18.3V - 4.0 60.0 mV
Load Regulation DV
O1,
DV
O2
I
O
= 0mA to 350mA - 50 80 mV
I
O
= 0mA to 750mA - 100 200 mV
Dynamic Output Current Limiting I
MAX
DCL = 0, ISEL H = 0, ISEL L = 0 (Note 8) 275 305 345 mA
DCL = 0, ISEL H = 0, ISEL L = 1 (Note 8) 515 570 630 mA
DCL = 0, ISEL H = 1, ISEL L = 0 (Note 8) 635 705 775 mA
DCL = 0, ISEL H = 1, ISEL L = 1 (Note 8) 800 890 980 mA
Dynamic Overload Protection Off Time TOFF DCL = 0, Output Shorted (Note 8) - 900 - ms
Dynamic Overload Protection On Time TON - 20 - ms
Static Output Current Limiting I
MAX
DCL = 1 (Note 8) - 990 - mA
Cable Fault CABF Threshold I
CAB
EN = 1, V
O
= 19V, No Tone 2 10 20 mA
ISL6423
