LTC3417AIFE#TRPBF Linear Technology, LTC3417AIFE#TRPBF Datasheet

IC DC/DC CONV DUAL 20TSSOP

LTC3417AIFE#TRPBF

Manufacturer Part Number
LTC3417AIFE#TRPBF
Description
IC DC/DC CONV DUAL 20TSSOP
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LTC3417AIFE#TRPBF

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
2
Voltage - Output
0.8 ~ 5 V
Current - Output
1A, 1.5A
Frequency - Switching
1.5MHz, 0.6MHz ~ 4MHz
Voltage - Input
2.25 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC3417AIFE#TRPBFLTC3417AIFE#3MMPBF
Manufacturer:
NEC
Quantity:
100
Company:
Part Number:
LTC3417AIFE#TRPBFLTC3417AIFE-2#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
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n
n
n
TYPICAL APPLICATION
2.5V TO 5.5V
High Effi ciency: 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
Short-Circuit Protected
V
Current Mode Operation for Excellent Line and Load
Transient Response
125μA Quiescent Current in Sleep Mode
Ultralow Shutdown Current: I
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
V
OUT1
IN
1.8V
1.5A
47μF
: 2.25V to 5.5V
V
IN
DS(ON)
511k
22pF
412k
10μF
2200pF
1.5μH
Internal Switches
5.9k
V
IN
FREQ
SW1
RUN1
V
I
TH1
FB1
LTC3417A
GND
V
IN
Q
RUN2
SW2
V
I
TH2
FB2
< 1μA
V
2.87k
2.2μH
IN
3417 TA01
6800pF
412k
866k
22pF
22μF
V
2.5V
1A
OUT2
Step-Down DC/DC Regulator
DESCRIPTION
The LTC
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
the need for external Schottky diodes.
A user selectable mode input allows the user to trade
off ripple voltage for light load effi ciency. Burst Mode
operation provides high effi ciency 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
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
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.
DS(ON)
®
power switches provide high effi ciency without
3417A is a dual constant frequency, synchronous
100
95
90
85
80
75
70
0.001
REFER TO FIGURE 4
(Burst Mode Operation)
Dual Synchronous
EFFICIENCY
OUT2 Effi ciency
0.01
LOAD CURRENT (A)
1.5A/1A 4MHz
POWER LOSS
0.1
V
V
FREQ = 1MHz
IN
OUT
= 3.6V
LTC3417A
= 2.5V
3417 TA01a
1
10
1
0.1
0.01
0.001
0.0001
3417afb
1
IN
®

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LTC3417AIFE#TRPBF Summary of contents

Page 1

... 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. ...

Page 2

... LTC3417AEDHC#TRPBF LTC3417AEFE#PBF LTC3417AEFE#TRPBF LTC3417AIFE#PBF LTC3417AIFE#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER I Input DC Supply Current (Note 4) S Active Mode Half Active Mode (V = 0V, 1.5A Only) RUN2 Half Active Mode (V = 0V, 1A Only) RUN1 ...

Page 4

LTC3417A TYPICAL PERFORMANCE CHARACTERISTICS OUT1 Burst Mode Operation V OUT 20mV/DIV I L 250mA/DIV V = 3.6V 2μs/DIV 1.8V OUT I = 100mA LOAD REFER TO FIGURE 4 OUT2 Burst Mode Operation V OUT 20mV/DIV I L ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS OUT2 Effi ciency (Pulse Skipping Mode) 100 I = 250mA LOAD 800mA LOAD 2.5V OUT REFER TO FIGURE 2.5 3 3.5 4 ...

Page 6

LTC3417A PIN FUNCTIONS (DFN/TSSOP) RUN1 (Pin 1/Pin 2): Enable for 1.5A Regulator. When at Logic 1, 1.5A regulator is running. When at 0V, 1.5A regulator is off. When both RUN1 and RUN2 are at 0V, the part is in shutdown. ...

Page 7

FUNCTIONAL DIAGRAM 1.5A REGULATOR V FB1 0.752V 0.848V RUN1 VOLTAGE REFERENCE RUN2 SYNC/MODE 0.848V 0.752V V FB2 1A REGULATOR I TH1 I TH LIMIT + – – – + LOGIC – V IN2 – LOGIC + ...

Page 8

LTC3417A OPERATION The LTC3417A uses a constant frequency, current mode architecture. Both channels share the same clock frequency. The PHASE pin sets whether the channels are running in-phase or out of phase. The operating frequency is de- termined by connecting ...

Page 9

APPLICATIONS INFORMATION A general LTC3417A application circuit is shown in Figure 4. External component selection is driven by the load requirement, and begins with the selection of the inductors L1 and L2. Once L1 and L2 are chosen ...

Page 10

LTC3417A APPLICATIONS INFORMATION Inductor Core Selection Different core materials and shapes will change the size/ current relationship of an inductor. Toroid or shielded pot cores in ferrite or permalloy materials are small and don’t radiate much energy, but generally cost ...

Page 11

APPLICATIONS INFORMATION When then the equation simplifi 1– RMS – V OUT IN OUT ( ) ...

Page 12

LTC3417A APPLICATIONS INFORMATION is given to ripple current ratings and long term reliability. Ceramic capacitors have the lowest ESR and cost but also have the lowest capacitance density, high voltage and temperature coeffi cient and exhibit audible piezoelectric effects. In ...

Page 13

APPLICATIONS INFORMATION V RUN 2V/DIV V OUT 1V/DIV I L 1A/DIV V = 3.6V 200μs/DIV 1.8V OUT R = 0.9Ω L Figure 2. Digital Soft-Start OUT1 I over 1024 clock cycles, as can be seen in Figures ...

Page 14

... For a detailed explanation of optimizing the compensation components, including a review of control loop theory, refer to Linear Technology Application Note 76. Although a buck regulator is capable of providing the full output current in dropout, it should be noted that as the ...

Page 15

APPLICATIONS INFORMATION low to high to low again, a packet of charge moves from V to ground. The resulting charge over the switching IN period is a current out of V that is typically much larger IN than the DC ...

Page 16

LTC3417A APPLICATIONS INFORMATION Remembering that the above junction temperature is obtained from 25°C, we might recalculate DS(ON) the junction temperature based on a higher R it increases with temperature. However, we can safely as- sume that the ...

Page 17

APPLICATIONS INFORMATION V IN 2.25V TO 5.5V V OUT1 1.8V C1 22pF 1.5A R1 511k C OUT1 47μF L1: MIDCOM DUS-5121-1R5R C : KEMET C1210C226K8PAC OUT1 Figure 4. 1.8V at 1.5A/2. Step-Down Regulators ...

Page 18

LTC3417A APPLICATIONS INFORMATION Board Layout Considerations When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the LTC3417A. These items are also illustrated graphically in the layout diagram of Figure 5. Check ...

Page 19

... DIMENSIONS ARE IN 3. DRAWING NOT TO SCALE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. DHC Package 16-Lead Plastic DFN (5mm × ...

Page 20

... OUT Converter LTC3448 1.5MHz/2.25MHz, 600mA Synchronous Step-Down DC/DC Converter with LDO Mode LTC3548 Dual 800mA and 400mA (I Step-Down DC/DC Converter ThinSOT is a trademark of Linear Technology Corporation. 20 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● COMMENTS 95% Effi ...

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