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Linear Technology Electronic Components Datasheet

LTC3417AEFE-2 Datasheet

Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator

No Preview Available !

LTC3417A-2 www.DataSheet4U.com
Dual Synchronous
1.5A/1A 4MHz
Step-Down DC/DC Regulator
FEATURES
n High Efficiency: Up to 95%
n 1.5A/1A Guaranteed Minimum Output Current
n Synchronizable to External Clock
n No Schottky Diodes Required
n Programmable Frequency Operation: 1.5MHz or
Adjustable From 0.6MHz to 4MHz
n Low Ripple (<35mVP-P) BurstMode® Operation
IQ: 125μA in Sleep
n Low RDS(ON) Internal Switches
n Short-Circuit Protected
n VIN: 2.25V to 5.5V
n Current Mode Operation for Excellent Line and Load
Transient Response
n Ultralow Shutdown Current: IQ < 1μA
n Low Dropout Operation: 100% Duty Cycle
n Power Good Ouput
n Phase Pin Selects 2nd Channel Phase Relationship
with Respect to 1st Channel
n Internal Soft-Start with Individual Run Pin Control
n Available in Small Thermally Enhanced
(5mm × 3mm) DFN and 20-Lead TSSOP Packages
APPLICATIONS
n GPS/Navigation Systems
n Automotive Instrumentation
n PC Cards
n Industrial Power Supplies
n General Purpose Point of Load DC/DC
DESCRIPTION
The LTC®3417A-2 is a dual constant frequency, synchro-
nous step-down DC/DC converter. Intended for medium
power applications, it operates from a 2.25V to 5.5V input
voltage 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
RDS(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
VIN and thus lower stress 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
100μA. In shutdown, the device draws <1μA.
L, LT, LTC, LTM 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, 6580258, 6304066, 6127815, 6498466, 6611131, 6144194.
TYPICAL APPLICATION
VIN
2.5V TO 5.5V
VOUT1
1.8V
1.5A
47μF
10μF
1.5μH
22pF
VIN
511k
412k
5.9k
2200pF
VIN
FREQ
SW1
SW2
RUN1
RUN2
LTC3417A-2
VFB1
VFB2
ITH1
ITH2
GND
2.2μH
22pF
VIN
866k
412k
2.87k
6800pF
3417A-2 TA01
VOUT2
2.5V
1A
22μF
VOUT2 Efficiency
(Burst Mode Operation)
100 REFER TO FIGURE 4
10
95
EFFICIENCY
1
90
0.1
85
0.01
80
POWER LOSS
75
70
0.001
0.001
VIN = 3.6V
VOUT = 2.5V
FREQ = 1MHz 0.0001
0.01
0.1
1
LOAD CURRENT (A)
3417A-2 TA01a
3417a2fa
1


Linear Technology Electronic Components Datasheet

LTC3417AEFE-2 Datasheet

Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator

No Preview Available !

LTC3417A-2
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN1, VIN2 Voltages...................................... – 0.3V to 6V
SYNC/MODE, SW1, SW2, RUN1,
RUN2, VFB1, VFB2, PHASE, FREQ,
ITH1, ITH2 Voltages......... –0.3V to ((VIN1 or VIN2)+ 0.3V)
VIN1 – VIN2, VIN2 – VIN1 .......................................... 0.3V
PGOOD Voltage ........................................... –0.3V to 6V
Operating Temperature Range (Note 2)
LTC3417AE-2 ....................................... –40°C to 85°C
LTC3417AI-2...................................... –40°C to 125°C
Junction Temperature (Notes 7, 8) ...................... 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
RUN1 1
VIN1 2
ITH1 3
VFB1 4
VFB2 5
ITH2 6
RUN2 7
VIN2 8
16 PGND1
15 SW1
14 PHASE
13 GNDA
17
12 FREQ
11 PGOOD
10 SW2
9 SYNC/MODE
DHC PACKAGE
16-LEAD (3mm × 5mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/ W
EXPOSED PAD (PIN 17) IS PGND2/GNDD
MUST BE SOLDERED TO PCB
TOP VIEW
GNDD 1
20 GNDD
RUN1 2
19 PGND1
VIN1 3
18 SW1
ITH1 4
VFB1 5
VFB2 6
17 PHASE
16 GNDA
21
15 FREQ
ITH2 7
RUN2 8
14 PGOOD
13 SW2
VIN2 9
12 SYNC/MODE
PGND2 10
11 PGND2
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 38°C/ W
EXPOSED PAD (PIN 21) IS PGND2/GNDD
MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3417AEDHC-2#PBF
LTC3417AEDHC-2#TRPBF
3417A2
16-Lead (3mm × 5mm) Plastic DFN –40°C to 85°C
LTC3417AIDHC-2#PBF
LTC3417AIDHC-2#TRPBF
3417A2
16-Lead (3mm × 5mm) Plastic DFN –40°C to 125°C
LTC3417AEFE-2#PBF
LTC3417AEFE-2#TRPBF
LTC3417AFE-2 20-Lead Plastic TSSOP
–40°C to 85°C
LTC3417AIFE-2#PBF
LTC3417AIFE-2#TRPBF
LTC3417AFE-2 20-Lead Plastic TSSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3417a2fa
2


Part Number LTC3417AEFE-2
Description Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator
Maker Linear
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LTC3417AEFE-2 Datasheet PDF






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