2
FN7445.0
December 13, 2006
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
Absolute Maximum Ratings (T
A
= +25°C) Thermal Information
Maximum Pin Voltages, all pins except below. . . . . . . . 6.5V
VIN,EN,ENL,LX,VHIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25V
VDELB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36V
VDRVP, VSINB, SRC, COM, DRN . . . . . . . . . . . . . . . . . . . . . . .36V
VDRVN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20V
Operating Conditions
Input Voltage Range, V
IN
. . . . . . . . . . . . . . . . . . . . . . . . 4.5V to 13V
Boost Output Voltage Range, A
VDD
. . . . . . . . . . . . . . +15V to +25V
V
ON
Output Range, V
ON
. . . . . . . . . . . . . . . . . . . . . . . +15V to +32V
V
OFF
Output Range, V
ON
. . . . . . . . . . . . . . . . . . . . . . . . -15V to -5V
Input Capacitance, C
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2x10µF
Boost Inductor, L1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3µH to 10µH
Output Capacitance, C
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . 4x10µF
Buck Inductor, L2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3µH to 10µH
Operating Ambient Temperature Range . . . . . . . . . .-40°C to +85°C
Operating Junction Temperature . . . . . . . . . . . . . . .-40°C to +125°C
Thermal Resistance
JA
( ° C / W )
JC
(°C/W)
38 Ld QFN Package (Notes 1, 2). . . . . 33 4.5
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.
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
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications V
IN
= 5V, A
VDD
= 15V, V
ON
= 20V, V
OFF
= -9V, V
LOGIC
= 3V, Over Temperature from -40°C to +85°C
PARAMETER DESCRIPTION CONDITION MIN TYP MAX UNIT
GENERAL
V
IN
Input Voltage 4.5 13.2 V
I
S
Sum Quiescent Current into Vin EN = 0, ENL = 0 3 mA
EN = ENL = 1, switching 15 mA
F
OSC
Oscillator Frequency 850 1000 1100 kHz
V
REF
Reference Voltage T
A
= +25°C 1.192 1.215 1.235 V
1.190 1.215 1.237 V
A
VDD
V
FBB
Feedback Reference Voltage T
A
= +25°C 1.195 1.208 1.221 V
1.193 1.208 1.223 V
V
F_FBB
FBB Fault Trip Point V
FBB
falling 0.85 0.9 0.95 V
D
MIN
Minimum Duty Cycle 19 25 %
D
MAX
Maximum Duty Cycle 80 86 %
Eff Boost Efficiency 90 %
I
FBB
FBB Input Bias Current 25 nA
R
LINEB
Line Regulation C
INT
= 2.2nF, V
IN
= 4.5V to12V, I
O
=100mA 0.01 0.25 %/V
R
LOADB
Load Regulation C
INT
= 2.2nF, V
IN
= 5V, I
AVDD
= 100mA to
350mA
0.03 0.25 %
R
ONB
Gate Drive on Resistance Pull-up 3.6
Pull-down 1.9
ISL97522
