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LTC3541EDD-1#TRPBF

Description
Conv DC-DC 2.7V to 5.5V Synchronous Step Down Dual-Out 0.8V to 5V 0.5A/0.5A 10-Pin DFN EP T/R
File Size549KB,22 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LTC3541EDD-1#TRPBF Overview

Conv DC-DC 2.7V to 5.5V Synchronous Step Down Dual-Out 0.8V to 5V 0.5A/0.5A 10-Pin DFN EP T/R

LTC3541EDD-1#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeSynchronous Step Down
Output TypeAdjustable
Switching Frequency (kHz)2700
Switching RegulatorYes
Number of Outputs2
Output Voltage (V)0.8 to 5
Maximum Output Current (A)0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5
Minimum Input Voltage (V)2.7
Maximum Input Voltage (V)5.5
Typical Switch Current (A)0.95
Typical Quiescent Current (uA)300
Line Regulation0.4%/V
Load Regulation0.5%(Typ)
Efficiency (%)90(Typ)
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
Pin Count10
Standard Package NameDFN
Supplier PackageDFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length3
Package Width3
PCB changed10
Lead ShapeNo Lead
LTC3541-1
High Efficiency
Buck + VLDO Regulator
FEATURES
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DESCRIPTION
The
LTC
®
3541-1
combines a synchronous buck DC/
DC converter with a very low dropout linear regulator
(VLDO) to provide up to two output voltages from a single
input voltage with minimal external components. When
configured for dual output operation, the LTC3541-1’s auto
start-up feature will bring the VLDO/linear regulator output
into regulation in a controlled manner prior to enabling the
Buck regulator output without the need for external pin
control. Buck output prior to VLDO/linear regulator output
sequencing may also be obtained via external pin control.
The input voltage range is ideally suited for Li-Ion battery-
powered applications, as well as powering sub-3.3V logic
from 5V or 3.3V rails.
The synchronous buck converter provides a high efficiency
output, typically 90%, capable of providing up to 500mA
of continuous output current while switching at 2.25MHz,
allowing the use of small surface mount inductors and ca-
pacitors. A mode-select pin allows Burst Mode operation
to be enabled for higher efficiency at light load currents, or
disabled for lower noise, constant frequency operation.
The VLDO regulator provides a low noise, low voltage
output capable of providing up to 300mA of continuous
output current using only a 2.2μF ceramic capacitor. The
input supply voltage of the VLDO regulator (LV
IN
) may
come from the buck regulator or a separate supply.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO is a
trademark of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.
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High Efficiency, 500mA Buck Plus 300mA VLDO
Regulator
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Auto Start-Up Powers VLDO/Linear Regulator
Output Prior to Buck Regulator Output
Independent High Efficiency, 500mA Buck
(V
IN
: 2.7V to 5.5V)
300mA VLDO Regulator with 30mA Standalone Mode
No External Schottky Diodes Required
Buck Output Voltage Range: 0.8V to 5V
VLDO Input Voltage Range (LV
IN
): 0.9V to 5.5V
VLDO Output Voltage Range VLDO: 0.4V to 4.1V
Selectable Fixed Frequency, Pulse-Skip Operation or
Burst Mode
®
Operation
Short-Circuit Protected
Current Mode Operation for Excellent Line and Load
Transient Response
Constant Frequency Operation: 2.25MHz
Low Dropout Buck Operation: 100% Duty Cycle
Small, Thermally Enhanced, 10-Lead (3mm × 3mm)
DFN Package
PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
PC Cards
Wireless and DSL Modems
Other Portable Power Systems
APPLICATIONS
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TYPICAL APPLICATION
LTC3541-1 Typical Application
V
IN
2.9V TO 5.5V
10µF
2.2µH
V
OUT1
2.5V
200mA
10µF
115k
ENBUCK
SW
LV
IN
22pF
243k
LTC3541-1
BUCKFB
PGND
LFB
GND
150k
35411 TA01a
Buck (Burst) Efficiency and Power Loss vs Load Current
100
90
80
EFFICIENCY
0.1
POWER LOSS (W)
1
ENVLDO
MODE
LV
OUT
412k
V
OUT2
1.5V
300mA
2.2µF
EFFICIENCY (%)
V
IN
70
60
50
40
30
20
10
0
1
V
IN
= 3.3V
V
OUT
= 2.5V
10
100
LOAD CURRENT (mA)
POWER LOSS
0.01
0.001
0.0001
1000
35411 TA01b
35411fb
For more information
www.linear.com/LTC3541-1
1

LTC3541EDD-1#TRPBF Related Products

LTC3541EDD-1#TRPBF LTC3541EDD-1#PBF
Description Conv DC-DC 2.7V to 5.5V Synchronous Step Down Dual-Out 0.8V to 5V 0.5A/0.5A 10-Pin DFN EP T/R Conv DC-DC 2.7V to 5.5V Synchronous Step Down Dual-Out 0.8V to 5V 0.5A/0.5A 10-Pin DFN EP Tube
EU restricts the use of certain hazardous substances Compliant Compliant
ECCN (US) EAR99 EAR99
Part Status Active Active
HTS 8542.39.00.01 8542.39.00.01
Type Synchronous Step Down Synchronous Step Down
Output Type Adjustable Adjustable
Switching Frequency (kHz) 2700 2700
Switching Regulator Yes Yes
Number of Outputs 2 2
Output Voltage (V) 0.8 to 5 0.8 to 5
Maximum Output Current (A) 0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5 0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5|0.5
Minimum Input Voltage (V) 2.7 2.7
Maximum Input Voltage (V) 5.5 5.5
Typical Switch Current (A) 0.95 0.95
Typical Quiescent Current (uA) 300 300
Line Regulation 0.4%/V 0.4%/V
Load Regulation 0.5%(Typ) 0.5%(Typ)
Efficiency (%) 90(Typ) 90(Typ)
Minimum Operating Temperature (°C) -40 -40
Maximum Operating Temperature (°C) 85 85
Supplier Temperature Grade Extended Extended
Pin Count 10 10
Standard Package Name DFN DFN
Supplier Package DFN EP DFN EP
Mounting Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max)
Package Length 3 3
Package Width 3 3
PCB changed 10 10
Lead Shape No Lead No Lead
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