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LTC3417AIFE#PBF

Description
降压 开关稳压器 IC 正 可调式 0.8V 2 输出 1A,1.5A 20-TSSOP(0.173",4.40mm 宽)裸露焊盘
Categorysemiconductor    Multi-channel IC (PMIC)   
File Size306KB,22 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric View All

LTC3417AIFE#PBF Overview

降压 开关稳压器 IC 正 可调式 0.8V 2 输出 1A,1.5A 20-TSSOP(0.173",4.40mm 宽)裸露焊盘

LTC3417AIFE#PBF Parametric

Parameter NameAttribute value
category
MakerADI
series-
PackagePipe fittings
Functionstep down
Output configurationjust
Topologystep down
Output typeAdjustable
Number of outputs2
Voltage - Input (minimum)2.25V
Voltage - input (maximum)5.5V
Voltage - Output (minimum/fixed)0.8V
Voltage - Output (maximum)5V
Current - Output1A,1.5A
Frequency - Switch1.5MHz,600kHz ~ 4MHz
Synchronous rectifieryes
Operating temperature-40°C ~ 85°C(TA)
Installation typesurface mount type
Package/casing20-TSSOP (0.173", 4.40mm wide) exposed pad
Supplier device packaging20-TSSOP-EP
Basic product numberLTC3417
FeaTures
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LTC3417A
Dual Synchronous
1.5A/1A 4MHz Step-Down
DC/DC Regulator
DescripTion
The LTC
®
3417A is a dual constant frequency, synchronous
step-down DC/DC converter. Intended for medium power
applications, it operates from a 2.25V to 5.5V input volt-
age range and has a constant programmable switching
frequency, allowing the use of tiny, low cost capacitors
and inductors 2mm or less in height. Each output voltage
is adjustable from 0.8V to 5V. Internal, synchronous, low
R
DS(ON)
power switches provide high efficiency without
the need for external Schottky diodes.
A user selectable mode input allows the user to trade
off ripple voltage for light load efficiency. Burst Mode
®
operation provides high efficiency at light loads, while
Pulse Skip mode provides low ripple noise at light loads.
A phase mode pin allows the second channel to operate
in-phase or 180° out-of-phase with respect to channel 1.
Out-of-phase operation produces lower RMS current on V
IN
and thus a lower RMS derating on the input capacitor.
To further maximize battery life, the P-channel MOSFETs
are turned on continuously in dropout (100% duty cycle)
and both channels draw a total quiescent current of only
125µA. In shutdown, the device draws <1µA.
L,
LT, LTC, LTM and Burst Mode are registered trademarks and Hot Swap and ThinSOT are
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815,
6498466, 6611131, 6144194.
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High Efficiency: Up to 95%
1.5A/1A Guaranteed Minimum Output Current
Synchronizable to External Clock
No Schottky Diodes Required
Programmable Frequency Operation: 1.5MHz or
Adjustable From 0.6MHz to 4MHz
Low R
DS(ON)
Internal Switches
Short-Circuit Protected
V
IN
: 2.25V to 5.5V
Current Mode Operation for Excellent Line and Load
Transient Response
125µA Quiescent Current in Sleep Mode
Ultralow Shutdown Current: I
Q
< 1µA
Low Dropout Operation: 100% Duty Cycle
Power Good Output
Phase Pin Selects 2nd Channel Phase Relationship
with Respect to 1st Channel
Internal Soft-Start with Individual Run Pin Control
Available in Small Thermally Enhanced
(5mm × 3mm) DFN and 20-Lead TSSOP Packages
GPS/Navigation
Digital Cameras
PC Cards
Wireless and DSL Modems
General Purpose Point of Load DC/DC
applicaTions
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Typical applicaTion
V
IN
2.5V TO 5.5V
10µF
1.5µH
22pF
511k
47µF
412k
I
TH1
5.9k
2200pF
GND
I
TH2
2.87k
6800pF
3417 TA01
OUT2 Efficiency
(Burst Mode Operation)
100
REFER TO FIGURE 4
EFFICIENCY
10
1
POWER LOSS (W)
0.1
0.01
80
75
70
0.001
POWER LOSS
V
IN
= 3.6V
V
OUT
= 2.5V
FREQ = 1MHz
0.01
0.1
LOAD CURRENT (A)
1
3417 TA01a
V
IN
FREQ
SW1
V
IN
RUN1
LTC3417A
V
FB1
V
FB2
SW2
RUN2
2.2µH
V
IN
22pF
866k
412k
22µF
V
OUT2
2.5V
1A
95
EFFICIENCY (%)
90
85
V
OUT1
1.8V
1.5A
0.001
0.0001
3417afc
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