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LTC3621HMS8E-23.3#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC3621/LTC3621-2
1
3621fc
For more information www.linear.com/LTC3621
Typical applicaTion
FeaTures DescripTion
17V, 1A Synchronous
Step-Down Regulator with
3.5µA Quiescent Current
The LT C
®
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 V
OUT
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 V
IN
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 FREQUENCY V
OUT
LTC3621 1.00MHz Adjustable
LTC3621-3.3 1.00MHz 3.3V
LTC3621-5 1.00MHz 5V
LTC3621-2 2.25MHz Adjustable
LTC3621-23.3 2.25MHz 3.3V
LTC3621-25 2.25MHz 5V
Efficiency and Power Loss vs Load at 1MHz
2.5V V
OUT
with 400mA Burst Clamp, f
SW
= 1MHz
applicaTions
n
Wide V
IN
Range: 2.7V to 17V
n
Wide V
OUT
Range: 0.6V to V
IN
n
95% Max Efficiency
n
Low I
Q
< 3.5µA, Zero-Current Shutdown
n
Constant Frequency (1MHz/2.25MHz)
n
Full Dropout Operation with Low I
Q
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
n
Portable-Handheld Scanners
n
Industrial and Embedded Computing
n
Automotive Applications
n
Emergency Radio
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.
604k 22pF
1µF
22µF
3621 TA01a
4.7µH
V
OUT
2.5V
1A
191k
V
IN
RUN
SW
V
IN
2.7V TO 17V
LTC3621
GND
FB
MODE/SYNC
INTV
CC
10µF
LOAD CURRENT (A)
0
0
EFFICIENCY (%)
POWER LOSS (W)
10
30
40
50
100
70
0.2
0.4 0.6
3621 TA01b
20
80
90
60
0
0.1
0.6
0.4
0.5
0.3
0.2
0.8
1
EFFICIENCY
POWER LOSS
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 2.5V
V
IN
= 12V
LTC3621/LTC3621-2
2
3621fc
For more information www.linear.com/LTC3621
absoluTe MaxiMuM raTings
V
IN
Voltage ................................................. 17V to –0.3V
RUN Voltage................................................ V
IN
to –0.3V
MODE/SYNC, FB Voltages ............................ 6V to –0.3V
PGOOD Voltages .......................................... 6V to –0.3V
(Note 1)
TOP VIEW
MODE/SYNC
INTV
CC
FB
SW
V
IN
RUN
DCB PACKAGE
6-LEAD (2mm
×
3mm) PLASTIC DFN
4
5
7
GND
6
3
2
1
T
JMAX
= 125°C, θ
JA
= 64°C/W, θ
JC
= 9.6°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
SW
V
IN
RUN
PGOOD
8
7
6
5
SGND
MODE/SYNC
INTV
CC
FB
TOP VIEW
9
GND
MS8E PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C, θ
JA
= 40°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
pin conFiguraTion
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3621EDCB#PBF LTC3621EDCB#TRPBF LGDG
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621IDCB#PBF LTC3621IDCB#TRPBF LGDG
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621EDCB-3.3#PBF LTC3621EDCB-3.3#TRPBF LGQF
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621IDCB-3.3#PBF LTC3621IDCB-3.3#TRPBF LGQF
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621EDCB-5#PBF LTC3621EDCB-5#TRPBF LGQC
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621IDCB-5#PBF LTC3621IDCB-5#TRPBF LGQC
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621EMS8E#PBF LTC3621EMS8E#TRPBF LTGDH 8-Lead Plastic MSOP –40°C to 125°C
LTC3621IMS8E#PBF LTC3621IMS8E#TRPBF LTGDH 8-Lead Plastic MSOP –40°C to 125°C
LTC3621HMS8E#PBF LTC3621HMS8E#TRPBF LTGDH 8-Lead Plastic MSOP –40°C to 150°C
LTC3621EMS8E-3.3#PBF LTC3621EMS8E-3.3#TRPBF LTGNY 8-Lead Plastic MSOP –40°C to 125°C
LTC3621IMS8E-3.3#PBF LTC3621IMS8E-3.3#TRPBF LTGNY 8-Lead Plastic MSOP –40°C to 125°C
LTC3621HMS8E-3.3#PBF LTC3621HMS8E-3.3#TRPBF LTGNY 8-Lead Plastic MSOP –40°C to 150°C
LTC3621EMS8E-5#PBF LTC3621EMS8E-5#TRPBF LTGNX 8-Lead Plastic MSOP –40°C to 125°C
LTC3621IMS8E-5#PBF LTC3621IMS8E-5#TRPBF LTGNX 8-Lead Plastic MSOP –40°C to 125°C
LTC3621HMS8E-5#PBF LTC3621HMS8E-5#TRPBF LTGNX 8-Lead Plastic MSOP –40°C to 150°C
LTC3621EDCB-2#PBF LTC3621EDCB-2#TRPBF LGHY
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621IDCB-2#PBF LTC3621IDCB-2#TRPBF LGHY
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621EDCB-23.3#PBF LTC3621EDCB-23.3#TRPBF LGQG
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621IDCB-23.3#PBF LTC3621IDCB-23.3#TRPBF LGQG
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621EDCB-25#PBF LTC3621EDCB-25#TRPBF LGQD
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3621IDCB-25#PBF LTC3621IDCB-25#TRPBF LGQD
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
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
LTC3621/LTC3621-2
3
3621fc
For more information www.linear.com/LTC3621
elecTrical characTerisTics
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
J
= 25°C. (Note 3) V
IN
= 12V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage 2.7 17 V
V
OUT
Operating Voltage 0.6 V
IN
V
I
VIN
Input Quiescent Current Shutdown Mode, V
RUN
= 0V
Burst Mode Operation
Forced Continuous Mode (Note4), V
FB
< 0.6V
0.1
3.5
1.5
1.0
7
µA
µA
mA
V
FB
Regulated Feedback Voltage LTC3621/LTC3621-2
l
0.594
0.591
0.6
0.6
0.606
0.609
V
V
I
FB
FB Input Current LTC3621/LTC3621-2 10 nA
V
OUT
Regulated Fixed Output Voltage LTC3621-3.3/LTC3621-23.3
l
3.267
3.250
3.3
3.3
3.333
3.350
V
V
LTC3621-5/L
TC3621-25
l
4.950
4.925
5.0
5.0
5.050
5.075
V
V
I
FB(VOUT)
Feedback Input Leakage Current Fixed Output Versions 2 10 µA
ΔV
LINE(REG)
Reference Voltage Line Regulation V
IN
= 2.7V to 17V (Note 5) 0.01 0.015 %/V
ΔV
LOAD(REG)
Output Voltage Load Regulation (Note 5) 0.1 %
I
LSW
NMOS Switch Leakage
PMOS Switch Leakage
0.1
0.1
1
1
µA
µA
R
DS(ON)
NMOS On-Resistance (Bottom FET) V
IN
= 5V 0.15 Ω
PMOS On-Resistance (Top FET) 0.37 Ω
D
MAX
Maximum Duty Cycle V
FB
= 0.5V, V
MODE/SYNC
= 1.5V
l
100 %
t
ON(MIN)
Minimum On-Time 60 ns
V
RUN
RUN Input High Threshold
RUN Input Low Threshold
0.3
1.0 V
V
I
RUN
RUN Input Current V
RUN
= 12V 0 20 nA
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/
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC3621HMS8E-23.3#TRPBF

Mfr. #:
Buy LTC3621HMS8E-23.3#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 17V, 1A, 1MHz Synchronous Step-Down Regulator with Ultralow Quiescent Current
Lifecycle:
New from this manufacturer.
Delivery:
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