LTC3621-2 Step-Down Regulator Datasheet

LTC3621-2 Datasheet, PDF, Equivalent


Part Number

LTC3621-2

Description

1A Synchronous Step-Down Regulator

Manufacture

Linear Technology

Total Page 16 Pages
Datasheet
Download LTC3621-2 Datasheet


LTC3621-2
Fea ures
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 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
8-Lead MSOPE Package with Power Good Output
and Independent SGND Pin
pplica ions
n Portable-Handheld Scanners
n Automotive Applications
n Emergency Radio
LTC3621/LTC3621-2
17V, 1A Synchronous
Step-Down Regulator with
3.5µA Quiescent Current
Descrip ion
The LTC®3621/LTC3621-2 is a high efficiency 17V, 1A
synchronous monolithic step-down regulato.rThe switch-
ing frequency is fixed to 1MHz or 2.25MHz. The regulator
features ultralow quiescent 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 low-
est voltage ripple.
List of LTC3621 Options
PART NAME
FREQUENCY
LTC3621
1.00MHz
LTC3621-2
2.25MHz
VOUT
Adjustable
Adjustable
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and Hot Swap is a trademark 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 pplica ion
2.5V VOUT with 400mA Burst Clamp, fSW = 1MHz
VIN
2.7V TO 17V
10µF
VIN SW
LTC3621
RUN FB
MODE
INTVCC
GND
4.7µH
604k
191k
1µF
22pF
VOUT
2.5V
1A
22µF
3621 TA01a
Efficiency and Power Loss vs Load
100 1.0
90 EFFICIENCY
80
0.1
70
60
50 0.01
40
30
20
10
0
0.0001
POWER LOSS
0.001
0.001
0.01
VIN = 12V 0.0001
0.1 1
LOAD CURRENT (A)
3621 TA01b
For more information www.linear.com/LTC3621
3621f
1
http://www.Datasheet4U.com

LTC3621-2
LTC3621/LTC3621-2
bsolu e Maxi u a ings (Note 1)
VIN Voltage (Note 2)................................... 17V to –0.3V
SW Voltage DC................................. VIN + 0.3V to –0.3V
Transient (Note 2) ...................................19V to –2.0V
RUN Voltage................................................ VIN to –0.3V
MODE, FB Voltages ...................................... 6V to –0.3V
INTVCC, PGOOD Voltages ............................ 6V to –0.3V
Operating Junction Temperature Range
(Note 3).................................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 125°C
in on igura ion
TOP VIEW
SW 1
6 MODE
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
RUN 3 GND 6 INTVCC
PGOOD 4
5 FB
MS8E PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
r er n or a ion
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
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
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
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
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/
lec rical harac eris ics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TJ = 25°C. VIN = 12V, unless otherwise noted. (Notes 3, 6)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
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
0.6 VIN
0 0.1
3.5 4.5
1.5
2 For more information www.linear.com/LTC3621
UNITS
V
V
µA
µA
mA
3621f


Features tA tA t EFFICIENCY (%) t Fea ures n Wide VIN R ange: 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 Cons tant Frequency (1MHz/2.25MHz) n Full Dr opout Operation with Low IQ n 1A Rated Output Current n ±1% Output Voltage Ac curacy n Current Mode Operation for Exc ellent Line and Load Transient Response n Pulse-Skipping, Forced Continuous, B urst Mode® Operation n Internal Compen sation and Soft-Start n Overtemperature Protection n Compact 6-Lead DFN (2mm 3mm) Package or 8-Lead MSOPE Package with Power Good Output and Independent SGND Pin pplica ions n Portable-Handhel d Scanners n Automotive Applications n Emergency Radio LTC3621/LTC3621-2 17V, 1A Synchronous Step-Down Regulator wit h 3.5µA Quiescent Current Descrip ion The LTC®3621/LTC3621-2 is a high eff iciency 17V, 1A synchronous monolithic step-down regulato.rThe switching frequ ency is fixed to 1MHz or 2.25MHz. The regulator features ultralow qui.
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