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LT1534-1 Datasheet

Ultralow Noise 2A Switching Regulators

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LT1534/LT1534-1
Ultralow Noise
2A Switching Regulators
FEATURES
s Greatly Reduced Conducted and Radiated EMI
s Low Switching Harmonic Content
s Independent Control of Switch Voltage and
Current Slew Rates
s 2A Current Limited Power Switch
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
U
APPLICATIO S
s Precision Instrumentation Systems
s Isolated Supplies for Industrial Automation
s Medical Instruments
s Wireless Communications
s Single Board Data Acquisition Systems
DESCRIPTIO
The LT®1534/LT1534-1 are a new class of switching regula-
tor designed to reduce conducted and radiated electromag-
netic interference (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 pro-
grammed to optimize switcher harmonic content versus
efficiency. The LT1534/LT1534-1 can reduce high frequency
harmonic power by as much as 40dB with only minor losses
in efficiency.
The LT1534/LT1534-1 utilize a current mode architecture
optimized for low noise boost topologies. The ICs include a
2A power switch 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 fea-
tures include cycle-by-cycle current limit protection, under-
voltage lockout and thermal shutdown.
Low minimum supply voltage and low supply current during
shutdown make the LT1534/LT1534-1 well suited for por-
table applications. The LT1534/LT1534-1 are available in the
16-pin narrow SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
L1
3.3V 50µH
1N5817
A
L3
50µH B
+ CIN
15
33µF
6.3V
12
SHDN
VIN
2
COL
4
SYNC
3300pF
5 CT
16.9k 6 RT
PGND
LT1534-1
RVSL
3
14
13
RCSL
10
L2
24k
24k
220pF
11
VC GND
6.8k 1,8,
15nF
9,16
FB
NFB
10
7
2.49k
+ C1
47µF
6.3V
×2
1nF
+
OPTIONAL
C2
47µF
7.5k
1534 TA01
CIN: MATSUSHITA ECGCOJB330
C1, C2: MATSUSHITA ECGCOJB47O
L1, L3: COILTRONICS CTX50-4
L2: COILCRAFT B08T (28nH) OR PC TRACE
5V
650mA
A
50mV/DIV
B
2mV/DIV
Figure 1. Low Noise 3.3V to 5V Boost Converter
5V Output Noise (BW = 100MHz)
10µs/DIV
1534 TA02
1


Linear Technology Electronic Components Datasheet

LT1534-1 Datasheet

Ultralow Noise 2A Switching Regulators

No Preview Available !

LT1534/LT1534-1
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage (VIN) .................................................. 30V
Switch Voltage (COL) .............................................. 35V
SHDN Pin Voltage .................................................... 30V
Feedback Pin Current (FB) .................................... 10mA
Negative Feedback Pin Current (NFB) .................. ±10mA
Operating Junction Temperature Range
LT1534C ................................................ 0°C to 125°C
LT1534I ............................................ – 40°C to 125°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
PACKAGE/ORDER INFORMATION
NC 1
COL 2
*NC 3
SYNC 4
CT 5
RT 6
FB 7
NFB 8
TOP VIEW
16 PGND
15 COL
14 VIN
13 RVSL
12 RCSL
11 SHDN
10 VC
9 GND
ORDER PART
NUMBER
LT1534CS
LT1534IS
S PACKAGE
16-LEAD PLASTIC SO
*DO NOT CONNECT
TJMAX = 125°C, θJA = 100°C/ W
Consult factory for Military grade parts.
GND 1
COL 2
PGND 3
SYNC 4
CT 5
RT 6
FB 7
GND 8
TOP VIEW
16 GND
15 VIN
14 RVSL
13 RCSL
12 SHDN
11 VC
10 NFB
9 GND
S PACKAGE
16-LEAD PLASTIC SO
**FOUR CORNER PINS ARE FUSED TO INTERNAL
DIE ATTACH PADDLE FOR HEAT SINKING.
CONNECT THESE FOUR PINS TO EXPANDED
PC LANDS FOR PROPER HEAT SINKING.
TJMAX = 125°C, θJA = 50°C/ W
ORDER PART
NUMBER
LT1534CS-1
LT1534IS-1
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = 5V, VC = 0.9V, VFB = VREF. COL, SHDN, NFB, all other pins open
unless otherwise noted.
SYMBOL
PARAMETER
Supply and Protection
VIN
VIN(MIN)
IVIN
IVIN(OFF)
Recommended Operating Range
Minimum Input Voltage
Operating Supply Current
Shutdown Supply Current
VSHDN
Shutdown Threshold
ISHDN
Shutdown Input Current
Error Amplifiers
VREF Reference Voltage
IFB
FBREG
Feedback Input Current
Reference Voltage Line Regulation
CONDITIONS
2.7V VIN 23V, RVSL, RCSL, RT = 17k
2.7V VIN 23V, VSHDN = 0V
2.7V VIN 23V, VSHDN = 0V
2.7V VIN 23V
Measured at Feedback Pin
VFB = VREF
2.7V VIN 23V
MIN TYP MAX
UNITS
q 2.7
23
q 2.55 2.7
q 12 30
q 12 50
12 30
q 0.4 0.8 1.2
–2
V
V
mA
µA
µA
V
µA
1.235
q 1.215
q
q
1.250
1.250
250
0.003
1.265
1.275
900
0.03
V
V
nA
%/V
2


Part Number LT1534-1
Description Ultralow Noise 2A Switching Regulators
Maker Linear Technology
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