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LT1534CS#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1534/LT1534-1
TYPICAL APPLICATION
U
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
Ultralow Noise
2A Switching Regulators
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.
■
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: 12µA Typical
■
Easier Layout than with Conventional Switchers
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Precision Instrumentation Systems
■
Isolated Supplies for Industrial Automation
■
Medical Instruments
■
Wireless Communications
■
Single Board Data Acquisition Systems
B
2mV/DIV
A
50mV/DIV
10µs/DIV
1534 TA02
5V Output Noise (BW = 100MHz)
SHDN
SYNC
COL
NFB
LT1534-1
GND
V
IN
3.3V
15
2
PGND
3
L2
R
VSL
14
R
CSL
13
7
12
4
5
6
11
3300pF
16.9k
220pF
1nF
24k
C
IN
33µF
6.3V
10Ω
24k
+
1N5817
A
OPTIONAL
L1
50µH
2.49k
6.8k
101,8,
9,16
7.5k
C1
47µF
6.3V
×2
+
C
IN
: MATSUSHITA ECGCOJB330
C1, C2: MATSUSHITA ECGCOJB47O
L1, L3: COILTRONICS CTX50-4
L2: COILCRAFT B08T (28nH) OR PC TRACE
1534 TA01
C
T
R
T
V
C
FB
L3
50µH
C2
47µF
5V
650mA
+
15nF
B
Figure 1. Low Noise 3.3V to 5V Boost Converter
2
LT1534/LT1534-1
ABSOLUTE MAXIMUM RATINGS
W
WW
U
Input Voltage (V
IN
) .................................................. 30V
Switch Voltage (COL) .............................................. 35V
SHDN Pin Voltage.................................................... 30V
Feedback Pin Current (FB) .................................... 10mA
Negative Feedback Pin Current (NFB) .................. ±10mA
ELECTRICAL CHARACTERISTICS
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
LT1534CS
LT1534IS
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
*DO NOT CONNECT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
COL
*NC
SYNC
C
T
R
T
FB
NFB
PGND
COL
V
IN
R
VSL
R
CSL
SHDN
V
C
GND
Consult factory for Military grade parts.
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
Operating Supply Current 2.7V ≤ V
IN
≤ 23V, R
VSL
, R
CSL
, R
T
= 17k ● 12 30 mA
I
VIN(OFF)
Shutdown Supply Current 2.7V ≤ V
IN
≤ 23V, V
SHDN
= 0V ● 12 50 µA
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
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 5V, V
C
= 0.9V, V
FB
= V
REF
. COL, SHDN, NFB, all other pins open
unless otherwise noted.
(Note 1)
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
ORDER PART
NUMBER
LT1534CS-1
LT1534IS-1
T
JMAX
= 125°C, θ
JA
= 50°C/W
TOP VIEW
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.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
COL
PGND
SYNC
C
T
R
T
FB
GND
GND
V
IN
R
VSL
R
CSL
SHDN
V
C
NFB
GND
3
LT1534/LT1534-1
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 5V, V
C
= 0.9V, V
FB
= V
REF
. COL, SHDN, NFB, all other pins open
unless otherwise noted.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Error Amplifiers
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
g
m
Error Amplifier Transconductance ∆I
C
= ±25µA 1100 1500 1900 µmho
● 700 2300 µmho
I
ESK
Error Amplifier Sink Current V
FB
= V
REF
+ 150mV, V
C
= 0.9V, V
SHDN
= 1V ● 120 200 350 µA
I
ESRC
Error Amplifier Source Current V
FB
= V
REF
– 150mV, V
C
= 0.9V, V
SHDN
= 1V ● 120 200 350 µA
V
CLH
Error Amplifier Clamp Voltage High Clamp, V
FB
= 1V 1.33 V
V
CLL
Error Amplifier Clamp Voltage Low Clamp, V
FB
= 1.5V 0.1 V
A
V
Error Amplifier Voltage Gain 180 250 V/V
Oscillator and Sync
f
MAX
Maximum Switch Frequency 250 kHz
f
SYNC
Synchronization Frequency Range f
OSC
= 250kHz ● 375 kHz
R
SYNC
SYNC Pin Input Resistance 40 kΩ
V
FBfs
FB Pin Threshold for Frequency Shift 5% Reduction from Nominal 0.4 V
Output Switches
DC
MAX
Maximum Switch Duty Cycle R
VSL
= R
CSL
= 4.9k, f
OSC
= 25kHz ● 88 91 %
t
IBL
Switch Current Limit Blanking Time 200 ns
BV
COL
Output Switch Breakdown Voltage 2.7V ≤ V
IN
≤ 23V ● 35 V
R
ON
Output Switch-On Resistance I
COL
= 1.5A, Both COL Pins Tied Together ● 0.25 0.43 Ω
I
LIM
Switch Current Limit Duty Cycle = 30% 2 A
Duty Cycle = 80% 1.6 A
∆I
IN
/∆I
SW
Supply Current Increase During 16 mA/A
Switch-On Time
Slew Control
V
SLEWR
Output Voltage Slew Rising Edge R
VSL
, R
CSL
= 17k 11 V/µs
V
SLEWF
Output Voltage Slew Falling Edge R
VSL
, R
CSL
= 17k 14.5 V/µs
I
SLEWR
Output Current Slew Rising Edge R
VSL
, R
CSL
= 17k 1.3 A/µs
I
SLEWF
Output Current Slew Falling Edge R
VSL
, R
CSL
= 17k 1.3 A/µs
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1534CS#TRPBF

Mfr. #:
Buy LT1534CS#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Ultralow N 2A Sw Reg
Lifecycle:
New from this manufacturer.
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