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LT1534C Datasheet

  • LT1534C

  • Linear Technology [Ultralow Noise 2A Switching Regulators]

  • LINER

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LT1534/LT1534-1
Ultralow Noise
2A Switching Regulators
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Greatly Reduced Conducted and Radiated EMI
Low Switching Harmonic Content
Independent Control of Switch Voltage and
Current Slew Rates
2A Current Limited Power Switch
Regulates Positive and Negative Voltages
20kHz to 250kHz Oscillator Frequency
Easily Synchronized to External Clock
Wide Input Voltage Range: 2.7V to 23V
Low Shutdown Current: 12碌A Typical
Easier Layout than with Conventional Switchers
APPLICATIO S
s
s
s
s
s
Precision Instrumentation Systems
Isolated Supplies for Industrial Automation
Medical Instruments
Wireless Communications
Single Board Data Acquisition Systems
The LT
廬
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
3.3V
L1
50碌H
1N5817
A
L3
50碌H
C1
47碌F
6.3V
脳2
B
+
C
IN
33碌F
6.3V
15
12
4
SHDN
SYNC
PGND
LT1534-1
R
VSL
R
T
R
CSL
11
V
C
GND
1,8,
9,16
NFB
FB
3
14
13
7
2.49k
24k
24k
V
IN
COL
2
10鈩?/div>
+
L2
1nF
+
OPTIONAL
5V
650mA
C2
47碌F
3300pF
5
16.9k 6
C
T
A
50mV/DIV
7.5k
1534 TA01
220pF
6.8k
15nF
10
C
IN
: MATSUSHITA ECGCOJB330
C1, C2: MATSUSHITA ECGCOJB47O
L1, L3: COILTRONICS CTX50-4
L2: COILCRAFT B08T (28nH) OR PC TRACE
B
2mV/DIV
Figure 1. Low Noise 3.3V to 5V Boost Converter
U
5V Output Noise (BW = 100MHz)
10碌s/DIV
1534 TA02
U
U
1

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