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LTC3541EDD-3#TRPBF

Description
Conv DC-DC 2.7V to 5.5V Synchronous Step Down Dual-Out 1.8V/1.575V 0.5A/0.5A 10-Pin DFN EP T/R
File Size500KB,22 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LTC3541EDD-3#TRPBF Overview

Conv DC-DC 2.7V to 5.5V Synchronous Step Down Dual-Out 1.8V/1.575V 0.5A/0.5A 10-Pin DFN EP T/R

LTC3541EDD-3#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 TypeFixed
Switching Frequency (kHz)2700
Switching RegulatorYes
Number of Outputs2
Output Voltage (V)1.8|1.575
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
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
LTC3541-3
High Efficiency
Buck + VLDO Regulator
FEATURES
n
DESCRIPTION
The
LTC
®
3541-3
combines a synchronous buck DC/DC
converter with a very low dropout linear regulator (VLDO™
regulator) and internal feedback resistor networks to
provide two output voltages from a single input voltage
with minimum external components. When configured
for dual output operation, the LTC3541-3’s auto start-up
feature will bring the 1.575V VLDO/linear regulator output
into regulation in a controlled manner prior to enabling the
1.8V buck output without the need for external pin control.
The 300mA VLDO/linear regulator output will source only
30mA until the buck output achieves regulation. The input
voltage range is ideally suited for applications powered
from a Li-Ion battery and 5V or 3.3V rails.
The synchronous buck converter provides a high efficiency
output, typically 90%. It can provide up to 500mA of output
current while switching at 2.25MHz, allowing the use of
small surface mount inductors and capacitors. 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 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 Output
Independent 500mA High Efficiency Buck
(V
IN
: 2.7V to 5.5V)
300mA VLDO Regulator with 30mA Standalone Mode
No External Schottky Diodes Required
Fixed Buck Output Voltage: 1.8V
VLDO Input Voltage Range (LV
IN
: 1.675V to 5.5V)
Fixed VLDO Output Voltage: 1.575V
Selectable Fixed Frequency, Pulse-Skip Operation
or Burst Mode
®
Operation
Short-Circuit Protected
Current Mode Operation for Excellent Line and Load
Transient Response
Shutdown Current: <3µA
Constant Frequency Operation: 2.25MHz
Low Dropout Buck Operation: 100% Duty Cycle
Small, Thermally Enhanced, 10-Lead (3mm × 3mm)
DFN Package
APPLICATIONS
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Digital Cameras
Cellular Phones
PC Cards
Wireless and DSL Modems
Other Portable Power Systems
TYPICAL APPLICATION
LTC3541-3 Typical Application
V
IN
3V TO 5.5V
10µF
2.2µH
ENBUCK
SW
V
IN
Buck (Burst) Efficiency vs Load Current
100
90
80
V
IN
= 3V
EFFICIENCY
0.1
POWER LOSS (W)
1
V
OUT1
1.8V
200mA
ENVLDO
MODE
EFFICIENCY (%)
70
60
50
40
30
20
10
0
1
10
100
LOAD CURRENT (mA)
POWER
LOSS
0.01
LTC3541-3
V
OUT2
1.575V
300mA
V
OUT
LV
IN
10µF
PGND
LV
OUT
GND
2.2µF
0.001
0.0001
1000
35413 TA01b
35413 TA01a
35413fd
For more information
www.linear.com/LTC3541-3
1

LTC3541EDD-3#TRPBF Related Products

LTC3541EDD-3#TRPBF LTC3541EDD-3#PBF
Description Conv DC-DC 2.7V to 5.5V Synchronous Step Down Dual-Out 1.8V/1.575V 0.5A/0.5A 10-Pin DFN EP T/R Conv DC-DC 2.7V to 5.5V Synchronous Step Down Dual-Out 1.8V/1.575V 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
Type Synchronous Step Down Synchronous Step Down
Output Type Fixed Fixed
Switching Frequency (kHz) 2700 2700
Switching Regulator Yes Yes
Number of Outputs 2 2
Output Voltage (V) 1.8|1.575 1.575|1.8
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
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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