LTC3622-2 Step-Down Regulator Datasheet

LTC3622-2 Datasheet, PDF, Equivalent


Part Number

LTC3622-2

Description

Dual 1A Synchronous Step-Down Regulator

Manufacture

Linear Technology

Total Page 24 Pages
Datasheet
Download LTC3622-2 Datasheet


LTC3622-2
Features
LTC3622/
LTC3622-2/LTC3622-23/5
17V, Dual 1A
Synchronous Step-Down Regulator
with Ultralow Quiescent Current
Description
n Dual Step-Down Outputs: 1A Per Channel
n Wide VIN Range: 2.7V to 17V
n Wide VOUT Range: 0.6V to VIN
n Up to 95% Efficiency
n No-Load IQ = 5µA with Both Channels Enabled;
IQ < 4µA with Only One Channel Enabled
n High Efficiency, Low Dropout Operation
(100% Duty Cycle)
n Constant Frequency (1MHz/2.25MHz) with External
Frequency Synchronization
n ±1% Output Voltage Accuracy
n Current Mode Operation for Excellent Line and Load
Transient Response
n Phase Shift Programmable with External Clock
n Selectable Current Limit
n Internal Compensation and Soft-Start
n Compact 14-Pin DFN (3mm × 4mm) and 16-Lead
MSOP Packages
Applications
n Battery Powered Systems
n Point-of-Load Supplies
n Portable – Handheld Scanners
The LTC®3622 is a dual 1A output, high efficiency synchro-
nous monolithic step-down regulator capable of operating
from input supplies up to 17V. The switching frequency is
fixed to 1MHz or 2.25MHz with a ±50% synchronization
range to an external clock. The regulator features ultralow
quiescent current and high efficiency over a wide output
voltage range.
The step-down regulators operate from an input voltage
range of 2.7V to 17V and provide an adjustable output
from 0.6V to VIN while delivering up to 1A of output cur-
rent. 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
ripple noise. The switching regulators can be synchronized
to an external clock. Furthermore, fixed VOUT options are
available to eliminate the external feedback resistors.
List of LTC3622 Options
PART NAME
FREQUENCY
LTC3622
1.00MHz
LTC3622-2
2.25MHz
LTC3622-23/5 2.25MHZ
VOUT
Adjustable
Adjustable
5V/3.3V
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, 5705919.
Typical Application
2.5V/5V VOUT Application, fSW = 1MHz
VOUT1
2.5V
1A
VIN
5.5V TO 17V
CIN
10µF
COUT1
22µF
22pF
4.7µH
619k
196k
VIN1 INTVCC
VIN2 MODE/SYNC
RUN1
RUN2
PHASE
ILIM
LTC3622
SW1 SW2
FB1 FB2
GND
C1
1µF
6.8µH
619k
84.5k
22pF
VOUT2
5V
1A
COUT2
22µF
3622 TA01
For more information www.linear.com/LTC3622
Efficiency vs Load Current
100 0.6
90
80 0.5
70 0.4
60
50 0.3
40
30
VOUT1 = 2.5V
VOUT2 = 5V
20 VIN = 12V
10
fSW = 1MHz
BURST MODE OPERATION
0
0.0001
0.001
0.01
0.1
LOAD CURRENT (A)
0.2
0.1
0
1
3622 TA01b
3622fa
1

LTC3622-2
LTC3622/
LTC3622-2/LTC3622-23/5
Absolute Maximum Ratings
(Note 1)
VIN1, VIN2, SVIN (MSOP Only) (Note 2)........ –0.3V to 17V
RUN1, RUN2............................................... –0.3V to 17V
MODE/SYNC, FB1, FB2................................. –0.3V to 6V
PGOOD1, PGOOD2, ILIM, PHASE................... –0.3V to 6V
Operating Junction Temperature Range (Note 3)
LTC3622E........................................... –40°C to 125°C
LTC3622I............................................ –40°C to 125°C
LTC3622H........................................... –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
VIN1
PGOOD1
MODE/SYNC
PHASE
PGOOD2
ILIM
VIN2
1
2
3
4
5
6
7
14 SW1
13 RUN1
15 12 FB1
GND 11 INTVCC
10 FB2
9 RUN2
8 SW2
DE PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 40°C/W, θJC = 4.4°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
PGOSVOVIDNIN11
1
2
3
MODE/SYNC 4
PHASE 5
PGOOD2 6
17
GND
16 SW1
15 NC
14 RUN1
13 FB1
12
11
IFNBT2VCC
VILINIM2
7
8
10 RUN2
9 SW2
MSE PACKAGE
16-LEAD PLASTIC MSE
TJMAX = 150°C, θJA = 40°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
LTC3622EDE#PBF
TAPE AND REEL
LTC3622EDE#TRPBF
PART MARKING*
3622
PACKAGE DESCRIPTION
14-Lead (3mm x 4mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
LTC3622IDE#PBF
LTC3622HDE#PBF
LTC3622EMSE#PBF
LTC3622IDE#TRPBF
LTC3622HDE#TRPBF
LTC3622EMSE#TRPBF
3622
3622
3622
14-Lead (3mm x 4mm) Plastic DFN
14-Lead (3mm x 4mm) Plastic DFN
16-Lead Plastic MSOP
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
LTC3622IMSE#PBF
LTC3622HMSE#PBF
LTC3622EDE-2#PBF
LTC3622IMSE#TRPBF
LTC3622HMSE#TRPBF
LTC3622EDE-2#TRPBF
3622
3622
36222
16-Lead Plastic MSOP
16-Lead Plastic MSOP
14-Lead (3mm x 4mm) Plastic DFN
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
LTC3622IDE-2#PBF
LTC3622HDE-2#PBF
LTC3622EMSE-2#PBF
LTC3622IDE-2#TRPBF
LTC3622HDE-2#TRPBF
LTC3622EMSE-2#TRPBF
36222
36222
36222
14-Lead (3mm x 4mm) Plastic DFN
14-Lead (3mm x 4mm) Plastic DFN
16-Lead Plastic MSOP
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
LTC3622IMSE-2#PBF
LTC3622HMSE-2#PBF
LTC3622EDE-23/5#PBF
LTC3622IMSE-2#TRPBF
LTC3622HMSE-2#TRPBF
LTC3622EDE-23/5#TRPBF
36222
36222
223/5
16-Lead Plastic MSOP
16-Lead Plastic MSOP
14-Lead (3mm x 4mm) Plastic DFN
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
LTC3622IDE-23/5#PBF LTC3622IDE-23/5#TRPBF
223/5
14-Lead (3mm x 4mm) Plastic DFN
–40°C to 125°C
LTC3622HDE-23/5#PBF LTC3622HDE-23/5#TRPBF
223/5
14-Lead (3mm x 4mm) Plastic DFN
–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.
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/
3622fa
2 For more information www.linear.com/LTC3622


Features Features LTC3622/ LTC3622-2/LTC3622-23/ 5 17V, Dual 1A Synchronous Step-Down Re gulator with Ultralow Quiescent Current Description n Dual Step-Down Outputs : 1A Per Channel n Wide VIN Range: 2.7 V to 17V n Wide VOUT Range: 0.6V to VI N n Up to 95% Efficiency n No-Load IQ = 5µA with Both Channels Enabled; IQ < 4µA with Only One Channel Enabled n High Efficiency, Low Dropout Operation (100% Duty Cycle) n Constant Frequenc y (1MHz/2.25MHz) with External Frequenc y Synchronization n ±1% Output Voltag e Accuracy n Current Mode Operation fo r Excellent Line and Load Transient Res ponse n Phase Shift Programmable with External Clock n Selectable Current Li mit n Internal Compensation and Soft-S tart n Compact 14-Pin DFN (3mm × 4mm) and 16-Lead MSOP Packages Applications n Battery Powered Systems n Point-of -Load Supplies n Portable – Handheld Scanners The LTC®3622 is a dual 1A o utput, high efficiency synchronous mono lithic step-down regulator capable of operating from input supplies up.
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