Datasheet

   
   
SLUS446B – MAY 2000 – REVISED DECEMBER 2000
4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range, T
A
= –40 C to
85 C, T
A
= T
J
, typical values are at T
A
= 25 C, V
IN
= 7.2 V, MODE = 1 (constant frequency),
SD/SYNC = 0 V. (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input Supply Section
VIN operating range 2.5 7.2 9 V
VIN = 3.6 V, not switching 625 900 µA
VIN supply current
(constant frequency mode)
VIN = 7.2 V, not switching 650 915 µA
(
cons
t
an
t
f
requency mo
d
e
)
VIN = 9.0 V, not switching 700 925 µA
VIN suppl
y
current
VIN = 3.6 V, not switching 220 295 µA
VIN
su ly
current
(burst mode)
VIN = 7.2 V, not switching 250 370 µA
VIN suppl
y
current
VIN = 3.6 V 230 340 µA
VIN
su ly
current
(sleep mode)
VIN = 7.2 V 190 275 µA
VIN = 7.2 V, SD/SYNC = VIN 1 15 µA
VIN shutdown current
VIN = 7.2 V, SD/SYNC = 4 V 2 25 µA
VIN
shutdown
current
VIN = 3.6 V, SD/SYNC = 3.6 V 1 15 µA
Error Amplifier Section
FB input voltage COMP = 0.5 V, T
A
= 25°C 790 800 810 mV
FB voltage line requlation
T
A
= 25°C, VIN = 2.8 V to 9 V 0.1 %/V
FB voltage line requlation
T
A
= 25°C, VIN = 2.8 V to 2.5 V 0.5 %
FB input voltage
COMP = 0.5 V, T
A
= 0°C to 70°C 784 800 816 mV
FB input voltage
COMP = 0.5 V, T
A
= –40°C to 85°C 777 800 823 mV
FB input bias current COMP = 0.5 V 100 500 nA
Open loop gain COMP = 0.2 V to 0.5 V 50 80 130 dB
Unity gain BW See Note 1 5 MHz
Maximum sinking current 250 500 µA
Maximum sourcing current –500 –250 µA
COMP output high voltage I
COMP
= –10 µA 1.60 2.00 2.75 V
COMP output low voltage I
COMP
= 10 µA 250 500 mV
Soft-start time 1 5 9 ms
Light Load Detectors Section
FB V
OFF
threshold 778 808 838 mV
FB V
ON
threshold 741 778 815 mV
FB V
MODE
threshold 725 762 799 mV
NOTE 1: Ensured by design. Not production tested.