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LTC3622HDE-23-5 Datasheet

Dual 1A Synchronous Step-Down Regulator

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LTC3622/
LTC3622-2/LTC3622-23/5
17V, Dual 1A
Synchronous Step-Down Regulator
with Ultralow Quiescent Current
FEATURES
DESCRIPTION
nn Dual Step-Down Outputs: 1A Per Channel
nn Wide VIN Range: 2.7V to 17V
nn Wide VOUT Range: 0.6V to VIN
nn Up to 95% Efficiency
nn No-Load IQ = 5µA with Both Channels Enabled;
IQ < 4µA with Only One Channel Enabled
nn High Efficiency, Low Dropout Operation
(100% Duty Cycle)
nn Constant Frequency (1MHz/2.25MHz) with External
Frequency Synchronization
nn ±1% Output Voltage Accuracy
nn Current Mode Operation for Excellent Line and Load
Transient Response
nn Phase Shift Programmable with External Clock
nn Selectable Current Limit
nn Internal Compensation and Soft-Start
nn Compact 14-Pin DFN (3mm × 4mm) and 16-Lead
MSOP Packages
APPLICATIONS
nn Battery Powered Systems
nn Point-of-Load Supplies
nn 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
All registered trademarks and 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
Document Feedback
For more information www.analog.com
Efficiency vs Load Current
100
0.6
90
80
70
60
50
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)
0.5
0.4
0.3
0.2
0.1
0
1
3622 TA01b
Rev D
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3622HDE-23-5 Datasheet

Dual 1A Synchronous Step-Down Regulator

No Preview Available !

LTC3622/
LTC3622-2/LTC3622-23/5
TABLE OF CONTENTS
Features............................................................................................................................. 1
Applications........................................................................................................................ 1
Typical Application ................................................................................................................ 1
Description......................................................................................................................... 1
Absolute Maximum Ratings...................................................................................................... 3
Pin Configuration.................................................................................................................. 3
Order Information.................................................................................................................. 3
Electrical Characteristics......................................................................................................... 4
Typical Performance Characteristics........................................................................................... 6
Pin Functions....................................................................................................................... 9
Block Diagram.....................................................................................................................10
Operation.......................................................................................................................... 11
Applications Information........................................................................................................13
Typical Applications..............................................................................................................20
Package Description.............................................................................................................21
Revision History..................................................................................................................23
Typical Application...............................................................................................................24
Related Parts......................................................................................................................24
Rev D
2
For more information www.analog.com


Part Number LTC3622HDE-23-5
Description Dual 1A Synchronous Step-Down Regulator
Maker Analog Devices
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