Regulator. LTC3621IDCB-3.3 Datasheet

LTC3621IDCB-3.3 Datasheet PDF

Part LTC3621IDCB-3.3
Description 1A Synchronous Step-Down Regulator
Feature LTC3621IDCB-3.3; Features n Wide VIN Range: 2.7V to 17V n Wide VOUT Range: 0.6V to VIN n 95% Max Efficiency n Low IQ .
Manufacture Linear
Datasheet
Download LTC3621IDCB-3.3 Datasheet




LTC3621IDCB-3.3
Features
n Wide VIN Range: 2.7V to 17V
n Wide VOUT Range: 0.6V to VIN
n 95% Max Efficiency
n Low IQ < 3.5µA, Zero-Current Shutdown
n Constant Frequency (1MHz/2.25MHz)
n Full Dropout Operation with Low IQ
n 1A Rated Output Current
n ±1% Output Voltage Accuracy
n Current Mode Operation for Excellent Line and Load
Transient Response
n Synchronizable to External Clock
n Pulse-Skipping, Forced Continuous, Burst Mode®
Operation
n Internal Compensation and Soft-Start
n Overtemperature Protection
n Compact 6-Lead DFN (2mm × 3mm) Package or
Thermally-Enhanced MS8E Package with Power
Good Output and Independent SGND Pin
Applications
n Portable-Handheld Scanners
n Industrial and Embedded Computing
n Automotive Applications
n Emergency Radio
LTC3621/LTC3621-2
17V, 1A Synchronous
Step-Down Regulator with
3.5µA Quiescent Current
Description
The LTC®3621/LTC3621-2 is a high efficiency 17V, 1A
synchronous monolithic step-down regulator. The switch-
ing frequency is fixed to 1MHz or 2.25MHz with a ±40%
synchronizing range. The regulator features ultralow quies-
cent current and high efficiencies over a wide VOUT range.
The step-down regulator operates from an input voltage
range of 2.7V to 17V and provides an adjustable output
range from 0.6V to VIN while delivering up to 1A of output
current. A user-selectable mode input is provided to allow
the user to trade off ripple noise for light load efficiency;
Burst Mode operation provides the highest efficiency at
light loads, while pulse-skipping mode provides the lowest
voltage ripple. The MODE pin can also be used to allow the
user to sync the switching frequency to an external clock.
LTC3621 Options
PART NAME
LTC3621
LTC3621-3.3
LTC3621-5
LTC3621-2
LTC3621-23.3
LTC3621-25
FREQUENCY
1.00MHz
1.00MHz
1.00MHz
2.25MHz
2.25MHz
2.25MHz
VOUT
Adjustable
3.3V
5V
Adjustable
3.3V
5V
L, LT, LTC, LTM, Burst Mode, Linear Technology, the Linear logo and LTSpice are registered
trademarks and Hot Swap and LTpowerCAD are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 6580258, 6498466, 6611131, 6177787, 5705919, 5847554.
Typical Application
2.5V VOUT with 400mA Burst Clamp, fSW = 1MHz
VIN
2.7V TO 17V
10µF
VIN
SW
LTC3621
RUN
FB
MODE/SYNC
INTVCC
GND
4.7µH
604k
191k
1µF
22pF
VOUT
2.5V
1A
22µF
3621 TA01a
Efficiency and Power Loss vs Load at 1MHz
100
0.6
VIN = 12V
90
80
EFFICIENCY
0.5
70
0.4
60
50
0.3
POWER LOSS
40
30
0.2
20
10
0
0
VOUT = 5V 0.1
VOUT = 3.3V
VOUT = 2.5V
0
0.2 0.4 0.6 0.8
1
LOAD CURRENT (A)
3621 TA01b
For more information www.linear.com/LTC3621
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LTC3621IDCB-3.3
LTC3621/LTC3621-2
Absolute Maximum Ratings (Note 1)
VIN Voltage.................................................. 17V to –0.3V
RUN Voltage................................................ VIN to –0.3V
MODE/SYNC, FB Voltages............................. 6V to –0.3V
PGOOD Voltages........................................... 6V to –0.3V
Operating Junction Temperature Range (Notes 3, 6, 7)
LTC3621E, LTC3621I........................... –40°C to 125°C
LTC3621H........................................... –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
SW 1
6 MODE/SYNC
VIN 2
7
GND
5 INTVCC
RUN 3
4 FB
DCB PACKAGE
6-LEAD (2mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 64°C/W, θJC = 9.6°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
SW 1
8 SGND
VIN 2
9
7 MODE/SYNC
RUN 3
GND
6 INTVCC
PGOOD 4
5 FB
MS8E PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 40°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
LTC3621EDCB#PBF
LTC3621IDCB#PBF
LTC3621EDCB-3.3#PBF
LTC3621IDCB-3.3#PBF
LTC3621EDCB-5#PBF
LTC3621IDCB-5#PBF
LTC3621EMS8E#PBF
LTC3621IMS8E#PBF
LTC3621HMS8E#PBF
LTC3621EMS8E-3.3#PBF
LTC3621IMS8E-3.3#PBF
LTC3621HMS8E-3.3#PBF
LTC3621EMS8E-5#PBF
LTC3621IMS8E-5#PBF
LTC3621HMS8E-5#PBF
LTC3621EDCB-2#PBF
LTC3621IDCB-2#PBF
LTC3621EDCB-23.3#PBF
LTC3621IDCB-23.3#PBF
LTC3621EDCB-25#PBF
LTC3621IDCB-25#PBF
TAPE AND REEL
LTC3621EDCB#TRPBF
LTC3621IDCB#TRPBF
LTC3621EDCB-3.3#TRPBF
LTC3621IDCB-3.3#TRPBF
LTC3621EDCB-5#TRPBF
LTC3621IDCB-5#TRPBF
LTC3621EMS8E#TRPBF
LTC3621IMS8E#TRPBF
LTC3621HMS8E#TRPBF
LTC3621EMS8E-3.3#TRPBF
LTC3621IMS8E-3.3#TRPBF
LTC3621HMS8E-3.3#TRPBF
LTC3621EMS8E-5#TRPBF
LTC3621IMS8E-5#TRPBF
LTC3621HMS8E-5#TRPBF
LTC3621EDCB-2#TRPBF
LTC3621IDCB-2#TRPBF
LTC3621EDCB-23.3#TRPBF
LTC3621IDCB-23.3#TRPBF
LTC3621EDCB-25#TRPBF
LTC3621IDCB-25#TRPBF
PART MARKING*
LGDG
LGDG
LGQF
LGQF
LGQC
LGQC
LTGDH
LTGDH
LTGDH
LTGNY
LTGNY
LTGNY
LTGNX
LTGNX
LTGNX
LGHY
LGHY
LGQG
LGQG
LGQD
LGQD
PACKAGE DESCRIPTION
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
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For more information www.linear.com/LTC3621



LTC3621IDCB-3.3
LTC3621/LTC3621-2
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3621EMS8E-2#PBF LTC3621EMS8E-2#TRPBF LTGHZ
8-Lead Plastic MSOP
–40°C to 125°C
LTC3621IMS8E-2#PBF LTC3621IMS8E-2#TRPBF LTGHZ
8-Lead Plastic MSOP
–40°C to 125°C
LTC3621HMS8E-2#PBF LTC3621HMS8E-2#TRPBF LTGHZ
8-Lead Plastic MSOP
–40°C to 150°C
LTC3621EMS8E-23.3#PBF LTC3621EMS8E-23.3#TRPBF LTGNZ
8-Lead Plastic MSOP
–40°C to 125°C
LTC3621IMS8E-23.3#PBF LTC3621IMS8E-23.3#TRPBF LTGNZ
8-Lead Plastic MSOP
–40°C to 125°C
LTC3621HMS8E-23.3#PBF LTC3621HMS8E-23.3#TRPBF LTGNZ
8-Lead Plastic MSOP
–40°C to 150°C
LTC3621EMS8E-25#PBF LTC3621EMS8E-25#TRPBF LTGQB
8-Lead Plastic MSOP
–40°C to 125°C
LTC3621IMS8E-25#PBF LTC3621IMS8E-25#TRPBF LTGQB
8-Lead Plastic MSOP
–40°C to 125°C
LTC3621HMS8E-25#PBF LTC3621HMS8E-25#TRPBF LTGQB
8-Lead Plastic MSOP
–40°C to 150°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/
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TJ = 25°C. (Note 3) VIN = 12V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
VIN
Operating Voltage
VOUT
Operating Voltage
IVIN
Input Quiescent Current
Shutdown Mode, VRUN = 0V
Burst Mode Operation
Forced Continuous Mode (Note 4), VFB
< 0.6V
2.7
17
V
0.6
VIN
V
0.1
1.0
µA
3.5
7
µA
1.5
mA
VFB
Regulated Feedback Voltage
LTC3621/LTC3621-2
0.594
0.6
0.606
V
l 0.591
0.6
0.609
V
IFB
FB Input Current
VOUT
Regulated Fixed Output Voltage
LTC3621/LTC3621-2
LTC3621-3.3/LTC3621-23.3
10
nA
3.267
3.3
3.333
V
l 3.250
3.3
3.350
V
LTC3621-5/LTC3621-25
4.950
5.0
5.050
V
l 4.925
5.0
5.075
V
IFB(VOUT) Feedback Input Leakage Current
ΔVLINE(REG) Reference Voltage Line Regulation
ΔVLOAD(REG) Output Voltage Load Regulation
ILSW
NMOS Switch Leakage
PMOS Switch Leakage
Fixed Output Versions
VIN = 2.7V to 17V (Note 5)
(Note 5)
2
10
µA
0.01
0.015
%/V
0.1
%
0.1
1
µA
0.1
1
µA
RDS(ON)
NMOS On-Resistance (Bottom FET)
PMOS On-Resistance (Top FET)
VIN = 5V
0.15
Ω
0.37
Ω
DMAX
Maximum Duty Cycle
VFB = 0.5V, VMODE/SYNC = 1.5V
l
100
%
tON(MIN)
VRUN
Minimum On-Time
RUN Input High Threshold
RUN Input Low Threshold
60
ns
1.0
V
0.3
V
IRUN
RUN Input Current
VRUN = 12V
0
20
nA
For more information www.linear.com/LTC3621
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