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Linear Technology Electronic Components Datasheet

LTC3413IFE Datasheet

Monolithic Synchronous Regulator

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LTC3413
3A, 2MHz Monolithic
Synchronous Regulator for
DDR/QDR Memory Termination
FEATURES
n High Efficiency: Up to 90%
n ±3A Output Current
n Symmetrical Source and Sink Output Current Limit
n Low RDS(ON) Internal Switch: 85mΩ
n No Schottky Diode Required
n 2.25V to 5.5V Input Voltage Range
n VOUT = VREF/2
n ±1% Output Voltage Accuracy
n Programmable Switching Frequency: Up to 2MHz
n Power Good Output Voltage Monitor
n Overtemperature Protected
n Available in 16-Lead TSSOP Exposed Pad Package
APPLICATIONS
n Bus Termination: DDR and QDR™ Memory,
SSTL, HSTL, ...
n Notebook Computers
n Distributed Power Systems
DESCRIPTION
The LTC®3413 is a high efficiency monolithic synchro-
nous step-down DC/DC converter utilizing a constant
frequency, current mode architecture. It operates from
an input voltage range of 2.25V to 5.5V and provides a
regulated output voltage equal to (0.5)VREF while sourcing
or sinking up to 3A of output current. An internal voltage
divider reduces component count and eliminates the need
for external resistors by dividing the reference voltage in
half. The internal synchronous power switch with 85mΩ
on-resistance increases efficiency and eliminates the need
for an external Schottky diode. Switching frequencies up
to 2MHz are set by an external resistor.
Forced-continuous operation in the LTC3413 reduces
noise and RF interference. Fault protection is provided
by an overcurrent comparator that limits output current
during both sourcing and sinking operations. Adjustable
compensation allows the transient response to be optimized
over a wide range of loads and output capacitors.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178.
TYPICAL APPLICATION
VIN
2.5V
22μF
4.7M
330pF
5.11k
2200pF
SVIN PVIN
PGOOD
VREF
SW
LTC3413
RUN/SS PGND
SGND
ITH
RT
VFB
L1
0.47μH
COUT
100μF
s2
309k
3413 F01a
L1: VISHAY DALE IHLP-2525CZ-01 0.47
COUT: TDK C4532X5R0J107M
VOUT
1.25V
±3A
Figure 1a. High Efficiency Bus Termination Supply
100
90
VIN = 2.5V
f = 1MHz
80
70
60
50
40
30
20
10
0
0.01
0.1
1
LOAD CURRENT (A)
10
3413 F01b
Figure 1b. Efficiency vs Load Current
3413fc
1


Linear Technology Electronic Components Datasheet

LTC3413IFE Datasheet

Monolithic Synchronous Regulator

No Preview Available !

LTC3413
ABSOLUTE MAXIMUM RATINGS
(Note 1)
SVIN, PVIN Supply Voltages......................... –0.3V to 6V
ITH, RUN/SS, VFB, PGOOD Voltages ............ –0.3V to VIN
VREF Voltage................................................ –0.3V to VIN
SW Voltage ................................... –0.3V to (VIN + 0.3V)
Operating Ambient Temperature Range
(Note 2) ................................................... –40°C to 85°C
Junction Temperature (Notes 5, 8)....................... 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................ 300°C
PIN CONFIGURATION
TOP VIEW
SVIN 1
PGOOD 2
16 PVIN
15 SW
ITH 3
14 SW
VFB 4
17
13 PGND
RT 5
12 PGND
VREF 6
11 SW
RUN/SS 7
10 SW
SGND 8
9 PVIN
FE PACKAGE
16-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 38°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) MUST BE SOLDERED TO PGND
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3413EFE#PBF
LTC3413EFE#TRPBF
3413EFE
16-Lead Plastic TSSOP
LTC3413IFE#PBF
LTC3413IFE#TRPBF
3413IFE
16-Lead Plastic TSSOP
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3413EFE
LTC3413EFE#TR
3413EFE
16-Lead Plastic TSSOP
LTC3413IFE
LTC3413IFE#TR
3413IFE
16-Lead Plastic TSSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN
VFB
IFB
IRUN
ΔVFB
VLOADREG
ΔVPGOOD
RPGOOD
IQ
Input Voltage Range
Feedback Voltage Accuracy
Voltage Feedback Leakage Current
RUN/SS Leakage Current
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Power Good Range
Power Good Pull-Down Resistance
Input DC Bias Current
Active Current
Shutdown
(Note 3)
VIN = 2.7V to 5.5V (Note 3)
Measured in Servo Loop, VITH = 0.36V
Measured in Servo Loop, VITH = 0.84V
(Note 4)
VFB = 1.5V, VITH = 1.4V, VREF = 2.5V
VRUN = 0V (Note 7)
2.25
5.5
V
l
±1
%
0.4
μA
1
μA
l
0.04
0.2
%/V
l
0.02
0.2
%
l
–0.02 –0.2
%
±10
±12
%
120
200
Ω
250
330
μA
0.02
1
μA
3413fc
2


Part Number LTC3413IFE
Description Monolithic Synchronous Regulator
Maker Linear
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