LT3694 반도체 회로 부품 판매점
36V / 2.6A Monolithic Buck Regulator
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 Linear Technology |
FEATURES
n Wide Input Range: 4V to 36V
n Overvoltage Shutdown Protects Circuit Through
70V Transients
n 2.6A Output Switching Regulator with Internal
Power Switch
n Dual, Low Dropout, Linear Regulator Controllers
with Programmable Current Limit
n Tracking/Soft-Start Inputs and Power Good Output
Simplify Soft-Start and Supply Sequencing
n Uses Small Inductors and Ceramic Capacitors
n VOUT(MIN) = 0.75V (Buck and LDOs)
n Adjustable 250kHz to 2.5MHz Switching Frequency
n Accurate Enable Threshold Allows User
Programmable Undervoltage Lockout
n Options for Clock Synchronization (LT3694) or Clock
Output to Enable Synchronization to Other Switching
Regulators (LT3694-1)
n Thermally Enhanced 28-Lead 4mm × 5mm QFN and
20-Lead TSSOP Packages
APPLICATIONS
n Automotive
n Industrial
n DSL and Cable Modems
n Distributed Power Regulation
n Wall Transformer Regulation
LT3694/LT3694-1
36V, 2.6A Monolithic Buck
Regulator With Dual LDO
DESCRIPTION
The LT®3694/LT3694-1 are monolithic, current mode
DC/DC converters with dual, low dropout regulator con-
trollers. The switching converter is a step-down converter
capable of generating up to 2.6A at its output. Each regula-
tor has independent track/soft-start circuits simplifying
power supply sequencing and interfacing with micro-
controllers and DSPs.
The switching frequency is set with a single resistor with a
range of 250kHz to 2.5MHz. The high switching frequency
permits the use of small inductors and ceramic capacitors
leading to very small triple output solutions. The constant-
switching frequency, combined with low impedance ce-
ramic capacitors, results in low, predictable output ripple.
Protection circuitry senses the current in the power switch
and external Schottky catch diode to protect the LT3694
against short-circuit conditions. Frequency foldback and
thermal shutdown provide additional protection.
With its wide input voltage range of 4V to 36V, the LT3694
regulates a broad array of power sources from 4-cell batteries
and 5V logic rails to unregulated wall transformers, lead acid
batteries and distributed power supplies. The LT3694 can be
synchronized to an external clock with the SYNC pin while
the LT3694-1 offers a CLKOUT pin allowing other DC/DC
converters to synchronize to the LT3694-1 clock.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN
4.5V TO 36V
4.7μF
EN/UVLO VIN BIAS BST
1nF
www.DaOtUaTS1 he0e.1tΩ4U.com
TRK/SS1
TRK/SS2
TRK/SS3
LIM2
LT3694
OUT2
2.5V
450mA
DRV2
24.9k
2.2μF
FB2
SYNC
10.7k
51.1k
PGOOD
RT
GND
fSW = 800kHz
SW
DA
FB1
VC1
LIM3
DRV3
FB3
0.22μF
4.7μH
B340A
330pF
41.2k
34k
10k
OUT1
3.3V
1.7A
47μF
0.1Ω
15.4k
OUT1
OUT3
1.8V
2.2μF 450mA
11k
36941 TA01a
Efficiency at VOUT = 3.3V
100
VIN = 4.5V
90
VIN = 12V
80 VIN = 36V
fSW = 800kHz
70
60
50
0
12
IOUT (A)
3
36941 TA01b
36941fa
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LT3694/LT3694-1
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN, EN/UVLO (Note 6)............................... –0.3V to 70V
BST ...........................................................................55V
BST Above SW..........................................................25V
PGOOD......................................................................16V
TRK/SS, VC, FB, RT, SYNC Pins...................................6V
BIAS, LIM2, LIM3 Pins ...............................................7V
Operating Junction Temperature Range (Notes 2 and 5)
LT3694E............................................. –40°C to 125°C
LT3694I.............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 Sec)
(TSSOP Only) ................................................... 300°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23
EN/UVLO 1
22 DA
SYNC (CLKOUT) 2
21 BST
PGOOD 3
20 BIAS
RT 4
TRK/SS1 5
29
GND
19 VC1
18 FB1
TRK/SS2 6
17 TRK/SS3
FB2 7
16 FB3
DRV2 8
15 DRV3
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm s 5mm) PLASTIC QFN
θJA = 34°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
LT3694-1 PINOUT IS SHOWN IN PARENTHESIS
TOP VIEW
VIN 1
EN/UVLO 2
20 SW
19 DA
SYNC(CLKOUT) 3
18 BST
PGOOD 4
17 BIAS
RT 5
TRK/SS1 6
21 16 VC1
GND 15 FB1
TRK/SS2 7
14 TRK/SS3
FB2 8
13 FB3
DRV2 9
12 DRV3
LIM2 10
11 LIM3
FE PACKAGE
20-LEAD PLASTIC TSSOP
θJA = 38°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
LT3694-1 PINOUT IS SHOWN IN PARENTHESIS
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3694EUFD#PBF
LT3694EUFD#TRPBF
3694
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3694IUFD#PBF
LT3694IUFD#TRPBF
3694
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3694EFE#PBF
LT3694EFE#TRPBF
LT3694FE
20-Lead Plastic TSSOP
–40°C to 125°C
LT3694IFE#PBF
LT3694IFE#TRPBF
LT3694FE
20-Lead Plastic TSSOP
–40°C to 125°C
LT3694-1EUFD#PBF
LT3694-1EUFD#TRPBF 36941
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
wwwLT.3D6a9t4a-S1IhUeFeDt#4PUB.Fcom LT3694-1IUFD#TRPBF 36941
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3694-1EFE#PBF
LT3694-1EFE#TRPBF LT3694FE-1
20-Lead Plastic TSSOP
–40°C to 125°C
LT3694-1IFE#PBF
LT3694-1IFE#TRPBF
LT3694FE-1
20-Lead Plastic TSSOP
–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.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
36941fa
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제조업체: Linear Technology
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LT3694 regulator
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
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전력반도체 문의 : 010-3582-2743
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