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LTC3413IFE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3413
1
3413fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
3A, 2MHz Monolithic
Synchronous Regulator for
DDR/QDR Memory Termination
The LTC
®
3413 is a high effi ciency 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)V
REF
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 effi ciency 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.
Figure 1a. High Effi ciency Bus Termination Supply
, 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.
n
High Effi ciency: Up to 90%
n
±3A Output Current
n
Symmetrical Source and Sink Output Current Limit
n
Low R
DS(ON)
Internal Switch: 85mΩ
n
No Schottky Diode Required
n
2.25V to 5.5V Input Voltage Range
n
V
OUT
= V
REF
/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
n
Bus Termination: DDR and QDR
™
Memory,
SSTL, HSTL, ...
n
Notebook Computers
n
Distributed Power Systems
PV
IN
SV
IN
PGOOD
SWV
REF
22μF
4.7M
309k
L1: VISHAY DALE IHLP-2525CZ-01 0.47
C
OUT
: TDK C4532X5R0J107M
V
IN
2.5V
C
OUT
100μF
s2
3413 F01a
V
OUT
1.25V
±3A
L1
0.47μH
LTC3413
PGNDRUN/SS
SGND
I
TH
R
T
V
FB
330pF
2200pF
5.11k
Figure 1b. Effi ciency vs Load Current
LOAD CURRENT (A)
0.01
40
EFFICIENCY (%)
50
60
70
80
0.1 1 10
3413 F01b
30
20
10
0
90
100
V
IN
= 2.5V
f = 1MHz
LTC3413
2
3413fc
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
SV
IN
, PV
IN
Supply Voltages ......................... –0.3V to 6V
I
TH
, RUN/SS, V
FB
, PGOOD Voltages ............ –0.3V to V
IN
V
REF
Voltage ................................................ –0.3V to V
IN
SW Voltage ................................... –0.3V to (V
IN
+ 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
(Note 1)
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
SV
IN
PGOOD
I
TH
V
FB
R
T
V
REF
RUN/SS
SGND
PV
IN
SW
SW
PGND
PGND
SW
SW
PV
IN
17
T
JMAX
= 125°C, θ
JA
= 38°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) MUST BE SOLDERED TO PGND
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3413EFE#PBF LTC3413EFE#TRPBF 3413EFE 16-Lead Plastic TSSOP –40°C to 85°C
LTC3413IFE#PBF LTC3413IFE#TRPBF 3413IFE 16-Lead Plastic TSSOP –40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3413EFE LTC3413EFE#TR 3413EFE 16-Lead Plastic TSSOP –40°C to 85°C
LTC3413IFE LTC3413IFE#TR 3413IFE 16-Lead Plastic TSSOP –40°C to 85°C
Consult LTC Marketing for parts specifi ed 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 specifi
cations, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.3V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range 2.25 5.5 V
V
FB
Feedback Voltage Accuracy (Note 3)
l
±1 %
I
FB
Voltage Feedback Leakage Current 0.4 μA
I
RUN
RUN/SS Leakage Current 1μA
ΔV
FB
Feedback Voltage Line Regulation V
IN
= 2.7V to 5.5V (Note 3)
l
0.04 0.2 %/V
V
LOADREG
Feedback Voltage Load Regulation Measured in Servo Loop, V
ITH
= 0.36V
Measured in Servo Loop, V
ITH
= 0.84V
l
l
0.02
–0.02
0.2
–0.2
%
%
ΔV
PGOOD
Power Good Range ±10 ±12 %
R
PGOOD
Power Good Pull-Down Resistance 120 200 Ω
I
Q
Input DC Bias Current
Active Current
Shutdown
(Note 4)
V
FB
= 1.5V, V
ITH
= 1.4V, V
REF
= 2.5V
V
RUN
= 0V (Note 7)
250
0.02
330
1
μA
μA
LTC3413
3
3413fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.3V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
OSC
Switching Frequency
Switching Frequency Range
R
OSC
= 309k
(Note 6)
0.88
0.30
1.00 1.12
2.00
MHz
MHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 300mA 85 110 mΩ
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= 300mA 65 90 mΩ
I
LIMIT
Peak Current Limit 3.8 5.4 A
V
UVLO
Undervoltage Lockout Threshold 1.75 2 2.25 V
I
LSW
SW Leakage Current V
RUN
= 0V, V
IN
= 5.5V (Note 7) 0.1 1 μA
V
RUN
RUN Threshold 0.5 0.65 0.8 V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3413E is guaranteed to meet performance specifi cations
from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. LTC3413I is guaranteed to meet specifi ed
performance from –40°C to 85°C.
Note 3: The LTC3413 is tested in a feedback loop that adjusts V
FB
to
achieve a specifi ed error amplifi er output voltage (I
TH
).
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency vs Load Current Effi ciency vs Input Voltage
Load Regulation
LOAD CURRENT (A)
0.01
40
EFFICIENCY (%)
50
60
70
80
0.1 1 10
3413 G01
30
20
10
0
90
100
V
IN
= 2.5V
V
OUT
= 1.25V
T
A
= 25°C
V
IN
= 3.3V
INPUT VOLTAGE (V)
2.5
EFFICIENCY (%)
50
60
70
4.0
5.0
3413 G02
40
30
20
3.0 3.5 4.5
80
90
100
5.5
LOAD = 1A
LOAD = 3A
LOAD = 100mA
V
OUT
= 1.25V
T
A
= 25°C
LOAD CURRENT (A)
0
–0.30
ΔV
OUT
/V
OUT
(%)
–0.25
–0.20
–0.15
–0.10
0
0.5
1.0 1.5 2.0
3413 G03
2.5 3.0
–0.05
T
A
= 25°C
Note 5: T
J
is calculated from the ambient temperature TA and power
dissipation P
D
as follows: LTC3413E: T
J
= T
A
+ (P
D
• 38°C/W)
Note 6: 2MHz operation is guaranteed by design and not production tested.
Note 7: Shutdown current and SW leakage current are only tested during
wafer sort.
Note 8: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3413IFE#TRPBF

Mfr. #:
Buy LTC3413IFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 3A, 4MHz, Synchronous Regulator for DDR Memory Termination
Lifecycle:
New from this manufacturer.
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