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LT1533 Datasheet

Ultralow Noise 1A Switching Regulator

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FEATURES
s Greatly Reduced Conducted and Radiated EMI
(<100µVP-P in Typical Application)
s Low Switching Harmonic Content
s Independent Control of Switch Voltage and
Current Slew Rates
s Two 1A Current Limited Power Switches
s Regulates Positive and Negative Voltages
s 20kHz to 250kHz Oscillator Frequency
s Easily Synchronized to External Clock
s Wide Input Voltage Range: 2.7V to 23V
s Low Shutdown Current: 12µA Typical
s Easier Layout than with Conventional Switchers
s Outputs Can Be Forced to 50% Duty Cycle for
Unregulated Applications
U
APPLICATIONS
s Precision Instrumentation Systems
s Isolated Supplies for Industrial Automation
s Medical Instruments
s Wireless Communications
s Single Board Data Acquisition Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1533
Ultralow Noise
1A Switching Regulator
DESCRIPTION
The LT®1533 is a new class of switching regulator designed
to reduce conducted and radiated electromagnetic interfer-
ence (EMI). Ultralow noise and EMI are achieved by providing
user control of the output switch slew rates. Voltage and
current slew rates can be independently programmed to
optimize switcher harmonic content versus efficiency. The
LT1533 can reduce high frequency harmonic power by as
much as 40dB with only minor losses in efficiency.
The LT1533 utilizes a dual output switch current mode
architecture optimized for low noise topologies. The IC
includes two 1A power switches along with all necessary
oscillator, control and protection circuitry. Unique error amp
circuitry can regulate both positive and negative voltages.
The internal oscillator may be synchronized to an external
clock for more accurate placement of switching harmonics.
Protection features include cycle by cycle current limit pro-
tection, undervoltage lockout and thermal shutdown.
Low minimum supply voltage and low supply current during
shutdown make the LT1533 well suited for portable applica-
tions. The part may also be forced into a 50% duty cycle mode
for unregulated applications. The LT1533 is available in the
16-pin narrow SO package.
TYPICAL APPLICATION
Low Noise 5V to 12V Forward Push-Pull DC/DC Converter
+
0.015µF
5V
14
33µF 11 VIN 2
SHDN
COL A
820pF
16.9k
3
DUTY
15
4
SYNC
COL B
5 CT
16
PGND
LT1533
13
6 RT
RVSL
12
RCSL
15k 10
7
VC GND
FB
NFB
1000pF 9
8
T1 1N4148
L1
300µH
L2
B 33µH A
Note 1
1N4148 + C1 +
47µF
16V
15k
15k
21.5k, 1%
1533 TA01
2.49k
1%
C1: SANYO OS-CON
C2: AVX TPS TANTALUM
L1: COILTRONICS CTX300-2
L2: COILCRAFT DT1608C-333
T1: COILTRONICS CTX02-13834
NOTE 1: 25nH TRACE INDUCTANCE
OR COILCRAFT B07T
12V
150mA
12V Output Noise (BW = 100MHz)
C2
33µF
20V
A
100µV/DIV
< 100µVP-P
B
2mV/DIV
2µs/DIV
1533 TA02
1


Linear Technology Electronic Components Datasheet

LT1533 Datasheet

Ultralow Noise 1A Switching Regulator

No Preview Available !

LT1533
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage (VIN) .................................................. 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
PACKAGE/ORDER INFORMATION
NC 1
COL A 2
DUTY 3
SYNC 4
CT 5
RT 6
FB 7
NFB 8
TOP VIEW
16 PGND
15 COL B
14 VIN
13 RVSL
12 RCSL
11 SHDN
10 VC
9 GND
ORDER PART
NUMBER
LT1533CS
LT1533IS
S PACKAGE
16-LEAD NARROW PLASTIC SO
TJMAX = 125°C, θJA = 100°C/ W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.9V, VFB = VREF. COL A, COL B, SHDN, NFB, DUTY pins open, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
Supply and Protection
VIN Recommended Operating Range
VIN(MIN)
Minimum Input Voltage
IVIN Supply Current
IVIN(OFF)
Shutdown Supply Current
VSHDN
Shutdown Threshold
ISHDN
Shutdown Input Current
Error Amplifiers
2.7V VIN 23V, RVSL, RCSL, RT = 17k
2.7V VIN 23V, VSHDN = 0V
2.7V VIN 23V
q 2.7
q
q
q
q 0.4
VREF Reference Voltage
Measured at Feedback Pin
1.235
q 1.215
IFB
FBREG
VNFR
Feedback Input Current
Reference Voltage Line Regulation
Negative Feedback Reference Voltage
VFB = VREF
2.7V VIN 23V
Measured at Negative Feedback Pin with
Feedback Pin Open
q
q
q – 2.550
INFR
NFBREG
Negative Feedback Input Current
Negative Feedback Reference Voltage
Line Regulation
VNFB = VNFR
2.7V VIN 23V
q – 37
q
TYP
2.55
12
12
0.8
–2
1.250
1.250
250
0.003
– 2.500
– 25
0.002
MAX
23
2.7
18
30
1.2
1.265
1.275
900
0.03
– 2.420
0.05
UNITS
V
V
mA
µA
V
µA
V
V
nA
%/V
V
µA
%/V
2


Part Number LT1533
Description Ultralow Noise 1A Switching Regulator
Maker Linear Technology
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