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LT1683EG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LT1683
1
1683fd
TYPICAL APPLICATION
DESCRIPTION
Slew Rate Controlled
Ultralow Noise Push-Pull DC/DC Controller
The LT
®
1683 is a switching regulator controller designed to
lower conducted and radiated electromagnetic interference
(EMI). Ultralow noise and EMI are achieved by controlling
the voltage and current slew rates of external N-channel
MOSFET switches. Current and voltage slew rates can
be independently set to optimize harmonic content of
the switching waveforms vs efficiency. The LT1683 can
reduce high frequency harmonic power by as much as
40dB with only minor losses in efficiency.
The LT1683 utilizes a dual output (push-pull) current
mode architecture optimized for low noise topologies.
The IC includes gate drivers and all necessary oscillator,
control and protection circuitry. Unique error amp circuitry
can regulate both positive and negative voltages. The oscil-
lator may be synchronized to an external clock for more
accurate placement of switching harmonics.
Protection features include gate drive lockout for low V
IN
,
opposite gate lockout, soft-start, output current limit,
short-circuit current limiting, gate drive overvoltage clamp
and input supply undervoltage lockout.
Ultralow Noise 48V to 5V DC/DC Converter
FEATURES
APPLICATIONS
n
Greatly Reduced Conducted and Radiated EMI
n
Low Switching Harmonic Content
n
Independent Control of Output Switch Voltage and
Current Slew Rates
n
Greatly Reduced Need for External Filters
n
Dual N-Channel MOSFET Drivers
n
20kHz to 250kHz Oscillator Frequency
n
Easily Synchronized to External Clock
n
Regulates Positive and Negative Voltages
n
Easier Layout Than with Conventional Switchers
n
Power Supplies for Noise Sensitive Communication
Equipment
n
EMI Compliant Offline Power Supplies
n
Precision Instrumentation Systems
n
Isolated Supplies for Industrial Automation
n
Medical Instruments
n
Data Acquisition Systems
A
B
MBRS340
MIDCOM 31244
22µH
150µF
OS-CON
MBRS340
MBR0530
22µH
OPTIONAL
2×100µF
POSCAP
5V/2A
3
10
1683 TA01
1113
SHDN
CAP A
NFB
LT1683
GND
V
IN
17
14 2
GCL
SS
V5
SYNC
GATE A
5
1
C
T
CAP B
6
18
R
T
GATE B
7
19
8
R
CSL
16
V
C
15
12
R
VSL
CS
4
PGND
20
FB
9
5pF
5pF
Si9422
Si9422
0.1Ω
976Ω
23.2k
10nF
1.5k
3.3k
25k
25k
3.3k
16.9k
1.2nF
39µF
63V
48V
68µF
20V
11V
8.2V
51k
510Ω
0.5W
2N3904
1N4148
10µF
20V
30pF
22nF0.22µF
7.50k
2.49k
FZT853
10pF
200V
30pF
10pF
200V
5V Output Noise
(Bandwidth = 100MHz)
A
200µV/DIV
B
20mV/DIV
200µV
P-P
5µs/DIV 1683 TA01a
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
DirectSense is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
LT1683
2
1683fd
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
IN
) .................................................20V
Gate Drive Current
.....................................Internal Limit
V5 Current
..................................................Internal Limit
SHDN Pin Voltage
.....................................................20V
Feedback Pin Voltage (Trans. 10ms) ...................... ±10V
Feedback Pin Current ............................................10mA
Negative Feedback Pin Voltage (Trans. 10ms) ......... ±10V
CS Pin
...........................................................................5V
GCL Pin
.......................................................................16V
SS Pin
...........................................................................3V
Operating Junction Temperature Range
(Note 3)
..................................................–40°C to 125°C
Storage Temperature Range
...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
.................. 300°C
(Note 1)
1
2
3
4
5
6
7
8
9
10
TOP VIEW
G PACKAGE
20-LEAD PLASTIC SSOP
20
19
18
17
16
15
14
13
12
11
GATE A
CAP A
GCL
CS
V5
SYNC
C
T
R
T
FB
NFB
PGND
GATE B
CAP B
V
IN
R
VSL
R
CSL
SHDN
SS
V
C
GND
T
JMAX
= 150°C, θ
JA
= 110°C/ W
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Error Amplifiers
V
REF
Reference Voltage Measured at Feedback Pin
l
1.235 1.250 1.265 V
I
FB
Feedback Input Current V
FB
= V
REF
l
250 1000 nA
FB
REG
Reference Voltage Line Regulation 2.7V ≤ V
IN
≤ 20V
l
0.012 0.03 %/V
V
NFR
Negative Feedback Reference Voltage Measured at Negative Feedback Pin
with Feedback Pin Open
l
–2.56 –2.500 –2.45 V
I
NFR
Negative Feedback Input Current V
NFB
= V
NFR
–37 –25 µA
NFB
REG
Negative Feedback Reference Voltage Line Regulation 2.7V ≤ V
IN
≤ 20V
l
0.009 0.03 %/V
g
m
Error Amplifier Transconductance ∆I
C
= ±50µA
l
1100
700
1500 2200
2500
µmho
µmho
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
C
= 0.9V, V
FB
= V
REF
, R
VSL
, R
CSL
= 16.9k, R
T
= 16.9k and
other pins open unless otherwise noted.
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1683EG#PBF LT1683EG#TRPBF 1683 20-Lead Plastic SSOP –40°C to 125°C
LT1683IG#PBF LT1683IG#TRPBF 1683 20-Lead Plastic SSOP – 40°C to 125°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1683EG LT1683EG#TR 1683 20-Lead Plastic SSOP –40°C to 125°C
LT1683IG LT1683IG#TR 1683 20-Lead Plastic SSOP –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
LT1683
3
1683fd
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
ESK
Error Amp Sink Current V
FB
= V
REF
+ 150mV, V
C
= 0.9V
l
120 200 350 µA
I
ESRC
Error Amp Source Current V
FB
= V
REF
– 150mV, V
C
= 0.9V
l
120 200 350 µA
V
CLH
Error Amp Clamp Voltage High Clamp, V
FB
= 1V 1.27 V
V
CLL
Error Amp Clamp Voltage Low Clamp, V
FB
= 1.5V 0.12 V
A
V
Error Amplifier Voltage Gain 180 250 V/V
FB
OV
FB Overvoltage Shutdown Outputs Drivers Disabled 1.47 V
I
SS
Soft-Start Charge Current V
SS
= 1V 9.0 12 µA
Oscillator and Sync
f
MAX
Max Switch Frequency 250 kHz
f
SYNC
Synchronization Frequency Range Oscillator Frequency = 250kHz 290 kHz
V
SYNC
SYNC Pin Input Threshold
l
0.7 1.4 2.0
R
SYNC
SYNC Pin Input Resistance 40 kΩ
Gate Drives (Specifications Apply to Either A or B Unless Otherwise Noted)
DC
MAX
Maximum Switch Duty Cycle R
VSL
= R
CSL
= 4.85k,
Osc Frequency = 25kHz
l
45 46 %
VG
ON
Gate On Voltage V
IN
= 12, GCL = 12
V
IN
= 12, GCL = 8
10
7.6
10.4
7.9
10.7
8.1
V
V
VG
OFF
Gate Off Voltage V
IN
= 12V 0.2 0.35 V
IG
SO
Max Gate Source Current V
IN
= 12V 0.3 A
IG
SK
Max Gate Sink Current V
IN
= 12V 0.3 A
V
INUVLO
Gate Drive Undervoltage Lockout (Note 5) V
GCL
= 6.5V, Gates Enabled 7.3 7.5 V
Current Sense
t
IBL
Switch Current Limit Blanking Time 100 ns
V
SENSE
Sense Voltage Shutdown Voltage V
C
Pulled Low
l
86 103 120 mV
V
SENSEF
Sense Voltage Fault Threshold
l
230 300 mV
Slew Control (for the Following Slew Tests See Test Circuit in Figure 1b)
V
SLEWR
Output Voltage Slew Rising Edge R
VSL
= R
CSL
= 17k 26 V/µs
V
SLEWF
Output Voltage Slew Falling Edge R
VSL
= R
CSL
= 17k 19 V/µs
VI
SLEWR
Output Current Slew Rising Edge (CS Pin Voltage) R
VSL
= R
CSL
= 17k 0.21 V/µs
VI
SLEWF
Output Current Slew Falling Edge (CS Pin Voltage) R
VSL
= R
CSL
= 17k 0.21 V/µs
Supply and Protection
V
INMIN
Minimum Input Voltage (Note 4) V
GCL
= V
IN
l
2.55 3.6 V
I
VIN
Supply Current (Note 2) R
VSL
= R
CSL
= 17k, V
IN
= 12
R
VSL
= R
CSL
= 17k, V
IN
= 20
l
l
25
35
45
55
mA
mA
V
SHDN
Shutdown Turn-On Threshold
l
1.31 1.39 1.48 V
∆V
SHDN
Shutdown Turn-On Voltage Hysteresis
l
50 110 180 mV
I
SHDN
Shutdown Input Current Hysteresis
l
10 24 35 µA
V5 5V Reference Voltage 6.5V ≤ V
IN
≤ 20V, IV5 = 5mA
6.5V ≤ V
IN
≤ 20V, IV5 = –5mA
4.85
4.80
5
5
5.20
5.15
V
V
IV5
SC
5V Reference Short-Circuit Current V
IN
= 6.5V Source
V
IN
= 6.5V Sink
10
–10
mA
mA
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
C
= 0.9V, V
FB
= V
REF
, R
VSL
, R
CSL
= 16.9k, R
T
= 16.9k and
other pins open unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LT1683EG#TRPBF

Mfr. #:
Buy LT1683EG#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators SR Controlled Ultralow N PP DC/DC Cntr
Lifecycle:
New from this manufacturer.
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