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LTC3548EDD-1#PBF

Description
Conv DC-DC 2.5V to 5.5V Synchronous Step Down Dual-Out 1.8V/1.575V 0.4A/0.8A 10-Pin DFN EP Tube
File Size315KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3548EDD-1#PBF Overview

Conv DC-DC 2.5V to 5.5V Synchronous Step Down Dual-Out 1.8V/1.575V 0.4A/0.8A 10-Pin DFN EP Tube

LTC3548EDD-1#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
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)0.8|0.4
Minimum Input Voltage (V)2.5
Maximum Input Voltage (V)5.5
Operating Supply Voltage (V)2.5 to 5.5
Typical Quiescent Current (uA)40
Line Regulation0.5%/V
Load Regulation0.5%(Typ)
Efficiency (%)95
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTube
Pin Count10
Standard Package NameDFN
Supplier PackageDFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length3
Package Width3
PCB changed10
Lead ShapeNo Lead
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
LTC3548-1
Dual Synchronous, Fixed
Output 2.25MHz Step-Down
DC/DC Regulator
DESCRIPTION
The LTC
®
3548-1 is a dual, fixed output, constant-frequency,
synchronous step-down DC/DC converter. Intended for low
power applications, it operates from 2.5V to 5.5V input
voltage range and has a constant 2.25MHz switching
frequency, allowing the use of tiny, low cost capacitors
and inductors with a profile ≤1mm. The output voltage
for channel 1 is fixed at 1.8V and for channel 2 is fixed
at 1.575V. Internal synchronous 0.35Ω, 1.2A/0.7A power
switches provide high efficiency without the need for ex-
ternal Schottky diodes. Burst Mode
®
operation provides
high efficiency at light loads.
To further maximize battery runtime, the P-channel
MOSFETs are turned on continuously in dropout (100%
duty cycle), and both channels draw a total quiescent cur-
rent of only 40μA. In shutdown, the device draws <1μA.
The LTC3548-1 is available in both thin (0.75mm) and
ultrathin (0.55mm) 3mm
×
3mm DFN packages.
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 5481178, 6127815, 6304066, 6498466, 6580258
6611131..
High Efficiency: Up to 95%
1.8V at 800mA/1.575V at 400mA
Very Low Quiescent Current: Only 40μA
2.25MHz Constant-Frequency Operation
High Switch Current: 1.2A and 0.7A
No Schottky Diodes Required
V
IN
: 2.5V to 5.5V
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I
Q
< 1μA
Small Thermally Enhanced 3mm
×
3mm
DFN Packages
APPLICATIONS
n
n
n
n
n
n
PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Wireless and DSL Modems
TYPICAL APPLICATION
LTC3548-1 Efficiency Curve/Power Loss
V
IN
2.7V TO 5.5V
100
C
IN
10μF
CER
4.7μH
SW2
C
FF2
330pF
V
OUT2
V
FB2
GND
SW1
V
OUT1
V
FB1
C
FF1
330pF
95
V
IN
RUN1 RUN2
EFFICIENCY (%)
LTC3548-1
V
OUT2
1.575V
400mA
C
OUT2
10μF
CER
2.2μH
V
OUT1
1.8V
800mA
C
OUT1
10μF
CER
3548-1 F01
1000
90
85
80
75
70
65
60
1
CHANNEL 1
CHANNEL 2
10
100
LOAD CURRENT (mA)
V
OUT1
= 1.8V
100
POWER LOSS (mW)
V
OUT2
= 1.575V
10
1
Figure 1. 1.8V/1.575V at 800mA/400mA Step-Down Regulators
0.1
1000
35481 F01b
35481fc
1

LTC3548EDD-1#PBF Related Products

LTC3548EDD-1#PBF LTC3548EDD-1#TRPBF LTC3548EKD-1#PBF LTC3548EKD-1#TRPBF
Description Conv DC-DC 2.5V to 5.5V Synchronous Step Down Dual-Out 1.8V/1.575V 0.4A/0.8A 10-Pin DFN EP Tube Conv DC-DC 2.5V to 5.5V Synchronous Step Down Dual-Out 1.8V/1.575V 0.4A/0.8A 10-Pin DFN EP T/R Conv DC-DC 2.5V to 5.5V Synchronous Step Down Dual-Out 1.8V/1.575V 0.4A/0.8A 10-Pin DFN EP Tube Conv DC-DC 2.5V to 5.5V Synchronous Step Down Dual-Out 1.8V/1.575V 0.4A/0.8A 10-Pin DFN EP T/R
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Active
Type Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down
Output Type Fixed Fixed Fixed Fixed
Switching Frequency (kHz) 2700 2700 2700 2700
Switching Regulator Yes Yes Yes Yes
Number of Outputs 2 2 2 2
Output Voltage (V) 1.8|1.575 1.8|1.575 1.8|1.575 1.8|1.575
Maximum Output Current (A) 0.8|0.4 0.4|0.8 0.8|0.4 0.4|0.8
Minimum Input Voltage (V) 2.5 2.5 2.5 2.5
Maximum Input Voltage (V) 5.5 5.5 5.5 5.5
Operating Supply Voltage (V) 2.5 to 5.5 2.5 to 5.5 2.5 to 5.5 2.5 to 5.5
Typical Quiescent Current (uA) 40 40 40 40
Line Regulation 0.5%/V 0.5%/V 0.5%/V 0.5%/V
Load Regulation 0.5%(Typ) 0.5%(Typ) 0.5%(Typ) 0.5%(Typ)
Efficiency (%) 95 95 95 95
Minimum Operating Temperature (°C) -40 -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85 85
Supplier Temperature Grade Extended Extended Extended Extended
Packaging Tube Tape and Reel Tube Tape and Reel
Pin Count 10 10 10 10
Standard Package Name DFN DFN DFN DFN
Supplier Package DFN EP DFN EP DFN EP DFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max)
Package Length 3 3 3 3
Package Width 3 3 3 3
PCB changed 10 10 10 10
Lead Shape No Lead No Lead No Lead No Lead
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