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LTC3418EUHF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
LTC3418
1
3418fc
For more information www.linear.com/LTC3418
Typical applicaTion
DescripTion
8A, 4MHz, Monolithic
Synchronous Step-Down
Regulator
FeaTures
applicaTions
n
High Efficiency: Up to 95%
n
8A Output Current
n
2.25V to 5.5V Input Voltage Range
n
Low R
DS(ON)
Internal Switch: 35mΩ
n
Tracking Input to Provide Easy Supply Sequencing
n
Programmable Frequency: 300kHz to 4MHz
n
0.8V ±1% Reference Allows Low Output Voltage
n
Quiescent Current: 380µA
n
Selectable Forced Continuous/Burst Mode
®
Operation
with Adjustable Burst Clamp
n
Synchronizable Switching Frequency
n
Low Dropout Operation: 100% Duty Cycle
n
Power Good Output Voltage Monitor
n
Overtemperature Protected
n
38-Lead Low Profile (0.75mm) Thermally Enhanced
QFN (5mm × 7mm) Package
n
Microprocessor, DSP and Memory Supplies
n
Distributed 2.5V, 3.3V and 5V Power Systems
n
Automotive Applications
n
Point of Load Regulation
n
Notebook Computers
The LTC
®
3418 is a high efficiency, monolithic synchronous
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 from 0.8V to 5V while delivering up to 8A of output
current. The internal synchronous power switch increases
efficiency and eliminates the need for an external Schottky
diode. Switching frequency is set by an external resistor
or can be synchronized to an external clock. OPTI-LOOP
®
compensation allows the transient response to be optimized
over a wide range of loads and output capacitors.
The LTC3418 can be configured for either Burst Mode
operation or forced continuous operation. Forced con
-
tinuous operation reduces noise and RF interference
while Burst Mode operation provides high efficiency by
reducing gate charge losses at light loads. In Burst Mode
operation, external control of the burst clamp level allows
the output voltage ripple to be adjusted according to the
requirements of the application. A tracking input in the
LT
C3418
allows for proper sequencing with respect to
another power supply.
2.5V/8A Step-Down Regulator
Efficiency and Power Loss vs Load Current
SV
IN
TRACK
R
T
C
IN
47µF
×4
0.2µH
LTC3418
RUN/SS
I
TH
PGOOD
SW
PGND
SGND
SYNC/MODE V
FB
332Ω
PV
IN
820pF
3418 TA01a
1000pF
C
OUT
100µF
×2
V
OUT
2.5V
8A
4.32k
1.69k
30.1k
2.2M
V
IN
2.8V TO 5.5V
4.99k
LOAD CURRENT (A)
0.01
60
EFFICIENCY (%)
POWER LOSS (mW)
80
100
0.1 1 10
3418 TA01b
40
50
70
90
30
20
1000
100000
100
10000
10
1
EFFICIENCY
POWER LOSS
V
IN
= 3.3V
V
OUT
= 2.5V
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP 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, 6724174.
LTC3418
2
3418fc
For more information www.linear.com/LTC3418
pin conFiguraTionabsoluTe MaxiMuM raTings
(Note 1)
Input Supply Voltage ................................... –0.3V to 6V
I
TH
, RUN/SS, V
FB
Voltages ......................... –0.3V to V
IN
SYNC/MODE Voltages ................................ –0.3V to V
IN
TRACK Voltage........................................... –0.3V to V
IN
SW Voltage .................................. –0.3V to (V
IN
+ 0.3V)
Operating Temperature Range
(Note 2) ...............................................–40°C to 85°C
Junction Temperature (Note 5) ............................. 125°C
Storage Temperature Range ................. –65°C to 125°C
13 14 15 16
TOP VIEW
39
UHF PACKAGE
38-LEAD (7mm × 5mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1SW
SW
PV
IN
PV
IN
PGOOD
R
T
RUN/SS
SGND
PV
IN
PV
IN
SW
SW
SW
SW
PV
IN
PV
IN
SYNC/MODE
I
TH
V
FB
SV
IN
PV
IN
PV
IN
SW
SW
PGND
PGND
PGND
TRACK
PGND
PGND
PGND
PGND
PGND
PGND
V
REF
PGND
PGND
PGND
23
22
21
20
9
10
11
12
T
JMAX
= 125°C, θ
JA
= 34°C/W, θ
JC
= 1°C/W
EXPOSED PAD (PIN 39) IS PGND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3418EUHF#PBF LTC3418EUHF#TRPBF 3418 38-Lead (7mm × 5mm) Plastic QFN –40°C to 85°C
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
http://www.linear.com/product/LTC3418#orderinfo
LTC3418
3
3418fc
For more information www.linear.com/LTC3418
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V. (Note 2)
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 LTC3418 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: The LTC3418 is tested in a feedback loop that adjusts V
FB
to
achieve a specified error amplifier output voltage (I
TH
).
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
as follows:
LTC3418: T
J
= T
A
+ (P
D
)(34°C/W)
Note 6: This parameter is guaranteed by design and characterization.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range 2.25 5.5 V
V
FB
Regulated Feedback Voltage 0°C ≤ T
A
≤ 85°C
(Note 3)
l
0.792
0.784
0.800
0.800
0.808
0.816
V
V
I
FB
Feedback Input Current 100 200 nA
∆V
FB
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V (Note 3) 0.04 0.2 %/V
V
LOADREG
Output 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
%
%
V
TRACK
Tracking Voltage Offset V
TRACK
= 0.4V 15 mV
Tracking Voltage Range 0 0.8 V
I
TRACK
TRACK Input Current 100 200 nA
∆V
PGOOD
Power Good Range ±7.5 ±9 %
R
PGOOD
Power Good Resistance 100 150 Ω
I
Q
Input DC Bias Current
Active Current
Shutdown
(Note 4)
V
FB
= 0.7V, V
ITH
= 1V
V
RUN
= 0V
380
0.03
450
1.5
µA
µA
f
OSC
Switching Frequency
Switching Frequency Range
R
OSC
= 69.8kΩ
(Note 6)
0.88
0.3
1 1.12
4
MHz
MHz
f
SYNC
SYNC Capture Range (Note 6) 0.3 4 MHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 600mA 35 50 mΩ
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –600mA 25 35 mΩ
I
LIMIT
Peak Current Limit 12 17 A
V
UVLO
Undervoltage Lockout Threshold 1.75 2 2.25 V
V
REF
Reference Output 1.219 1.250 1.281 V
I
LSW
SW Leakage Current V
RUN
= 0V, V
IN
= 5.5V 0.1 1 µA
V
RUN
RUN Threshold 0.5 0.65 0.8 V
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LTC3418EUHF#PBF

Mfr. #:
Buy LTC3418EUHF#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 8A, 4MHz, Mono Sync Buck Reg
Lifecycle:
New from this manufacturer.
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