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LTC3548EMSE

Description
Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator
CategoryPower/power management    The power supply circuit   
File Size240KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC3548EMSE Overview

Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3548EMSE Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeMSOP
package instructionHTSSOP, TSSOP10,.19,20
Contacts10
Manufacturer packaging codeMSE
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Maximum input voltage5.5 V
Minimum input voltage2.5 V
Nominal input voltage3.6 V
JESD-30 codeS-PDSO-G10
JESD-609 codee0
length3 mm
Humidity sensitivity level1
Number of functions2
Number of terminals10
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1.6 A
Package body materialPLASTIC/EPOXY
encapsulated codeHTSSOP
Encapsulate equivalent codeTSSOP10,.19,20
Package shapeSQUARE
Package formSMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.1 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency2700 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3 mm
Base Number Matches1
LTC3548
Dual Synchronous,
400mA/800mA, 2.25MHz
Step-Down DC/DC Regulator
FEATURES
DESCRIPTIO
High Efficiency: Up to 95%
Very Low Quiescent Current: Only 40µA
2.25MHz Constant Frequency Operation
High Switch Current: 0.7A and 1.2A
No Schottky Diodes Required
Low R
DS(ON)
Internal Switches: 0.35Ω
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
Output Voltages from 5V down to 0.6V
Power-On Reset Output
Externally Synchronizable Oscillator
Small Thermally Enhanced MSOP and 3mm
×
3mm
DFN Packages
The LTC
®
3548 is a dual, 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
≤1.2mm.
Each output voltage is adjustable
from 0.6V to 5V. Internal synchronous 0.35Ω, 0.7A/1.2A
power switches provide high efficiency without the need
for external Schottky diodes.
A user selectable mode input is provided to allow the user
to trade-off noise ripple for low power efficiency. Burst
Mode
®
operation provides high efficiency at light loads,
while Pulse Skip Mode provides low noise ripple 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
current of only 40µA. In shutdown, the device draws <1µA.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Burst Mode is a registered
trademark of Linear Technology Corporation. Protected by U.S. Patents including 5481178,
6580258, 6304066, 6127815, 6498466, 6611131.
APPLICATIO S
PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Wireless and DSL Modems
TYPICAL APPLICATIO
V
IN
= 2.8V
TO 5.5V
10µF
RUN2
V
IN
RUN1
POR
100k
RESET
MODE/SYNC
LTC3548
V
OUT2
= 2.5V
AT 400mA
4.7µH
SW2
68pF
EFFICIENCY (%)
2.2µH
SW1
33pF
V
OUT1
= 1.8V
AT 800mA
887k
4.7µF
280k
V
FB2
GND
V
FB1
604k
301k
10µF
3548 TA01
Figure 1. 2.5V/1.8V at 400mA/800mA Step-Down Regulators
U
LTC3548 Efficiency Curve
100
95
90
85
80
POWER LOSS
75
70
65
60
1
V
IN
= 3.3V, V
OUT
= 1.8V
Burst Mode OPERATION
CHANNEL 1, NO LOAD ON CHANNEL 2
10
100
LOAD CURRENT (mA)
1
10
EFFICIENCY
100
POWER LOSS (mW)
1000
0.1
1000
3548 TA02
U
U
3548f
1

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