Datasheet
2
LT1533
ABSOLUTE MAXIMUM RATINGS
W
WW
U
(Note 1)
Input Voltage (V
IN
) .................................................. 30V
Switch Voltage (COL A, COL B) ............................... 30V
SHDN Pin Voltage.................................................... 30V
Feedback Pin Current............................................ 10mA
Negative Feedback Pin Current ............................ ±10mA
Storage Temperature Range ................. –65°C to 150°C
Maximum Junction Temperature ......................... 125°C
Operating Junction Temperature Range
LT1533C............................................... 0°C to 100°C
LT1533I ............................................ –40°C to 100°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LT1533CS
LT1533IS
PACKAGE/ORDER INFORMATION
W
U
U
ELECTRICAL CHARACTERISTICS
V
IN
= 5V, V
C
= 0.9V, V
FB
= V
REF
. COL A, COL B, SHDN, NFB, DUTY pins open, unless otherwise noted.
Consult factory for Military grade parts.
TOP VIEW
S PACKAGE
16-LEAD NARROW PLASTIC SO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
COL A
DUTY
SYNC
C
T
R
T
FB
NFB
PGND
COL B
V
IN
R
VSL
R
CSL
SHDN
V
C
GND
T
JMAX
= 125°C, θ
JA
= 100°C/ W
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply and Protection
V
IN
Recommended Operating Range ● 2.7 23 V
V
IN(MIN)
Minimum Input Voltage ● 2.55 2.7 V
I
VIN
Supply Current 2.7V ≤ V
IN
≤ 23V, R
VSL
, R
CSL
, R
T
= 17k ● 12 18 mA
I
VIN(OFF)
Shutdown Supply Current 2.7V ≤ V
IN
≤ 23V, V
SHDN
= 0V ● 12 30 µA
V
SHDN
Shutdown Threshold 2.7V ≤ V
IN
≤ 23V ● 0.4 0.8 1.2 V
I
SHDN
Shutdown Input Current –2 µA
Error Amplifiers
V
REF
Reference Voltage Measured at Feedback Pin 1.235 1.250 1.265 V
● 1.215 1.250 1.275 V
I
FB
Feedback Input Current V
FB
= V
REF
● 250 900 nA
FB
REG
Reference Voltage Line Regulation 2.7V ≤ V
IN
≤ 23V ● 0.003 0.03 %/V
V
NFR
Negative Feedback Reference Voltage Measured at Negative Feedback Pin with ● –2.550 –2.500 –2.420 V
Feedback Pin Open
I
NFR
Negative Feedback Input Current V
NFB
= V
NFR
● –37 –25 µA
NFB
REG
Negative Feedback Reference Voltage 2.7V ≤ V
IN
≤ 23V ● 0.002 0.05 %/V
Line Regulation