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LT8614IUDC#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT8614
1
8614fc
For more information www.linear.com/LT8614
TYPICAL APPLICATION
FEATURES DESCRIPTION
42V, 4A Synchronous
Step-Down Silent Switcher
with 2.5µA Quiescent Current
The LT
®
8614 step-down regulator features Silent Switcher
architecture designed to minimize EMI/EMC emissions
while delivering high efficiency at frequencies up to 3MHz.
Assembled in a 3mm × 4mm QFN, the monolithic construc
-
tion with integrated power switches and inclusion of all
necessar
y circuitry yields a solution with a minimal PCB
footprint. An ultralow 2.5µA quiescent current—with the
output in full regulation— enables applications requiring
highest efficiency at very small load currents. Transient
response remains excellent and output voltage ripple is
below 10mV
P-P
at any load, from zero to full current.
The LT8614 allows high V
IN
to low V
OUT
conversion at
high frequency with a fast minimum top switch on-time of
30ns. Operation is safe in overload even with a saturated
inductor.
Essential features are included and easy to use: An open-
drain PG pin signals when the output is in regulation. The
SYNC pin allows clock synchronization and choice of Burst
Mode operation or pulse-skipping mode. Soft-start and
tracking functionality is accessed via the TR/SS pin. An
accurate enable threshold can be set using the
EN/UV pin
and a resistor at the RT pin programs switch frequency.
5V 4A Step-Down Converter
12V
IN
to 5V
OUT
Efficiency
APPLICATIONS
n
Silent Switcher™ Architecture:
Ultralow EMI/EMC Emissions
n
High Efficiency at High Frequency
Up to 96% Efficiency at 1MHz
Up to 94% Efficiency at 2MHz
n
Wide Input Voltage Range: 3.4V to 42V
n
Ultralow Quiescent Current Burst Mode
®
Operation:
2.5μA I
Q
Regulating 12V
IN
to 3.3V
OUT
Output Ripple < 10mV
P-P
n
Fast Minimum Switch-On Time: 30ns
n
Low Dropout Under All Conditions: 200mV at 1A
n
Safely Tolerates Inductor Saturation in Overload
n
Adjustable and Synchronizable: 200kHz to 3MHz
n
Peak Current Mode Operation
n
Accurate 1V Enable Pin Threshold
n
Internal Compensation
n
Output Soft-Start and Tracking
n
Small 18-Lead 3mm × 4mm QFN
n
Automotive and Industrial Supplies
n
General Purpose Step-Down
n
GSM Power Supplies
L, LT , LT C , LT M , Linear Technology, the Linear logo and Burst Mode are registered trademarks
and Silent Switcher is a trademark of Linear Technology Corporation. All other trademarks are
the property of their respective owners.
V
IN2
V
IN1
EN/UV
PG
LT8614
8614 TA01a
BST
SYNC/MODE SW
TR/SS BIAS
INTV
CC
FB
RT GND
1µF
0.1µF
4.7pF
47µF
1M
V
OUT
5V
4A
1µF
4.7µF
V
IN
5.8V TO 42V
10nF
41.2k
1µF
4.7µH
243k
GND2GND1
f
SW
= 1MHz
LOAD CURRENT (A)
0
EFFICIENCY (%)
80
90
4.0
8614 TA01b
70
60
1.0
2.0
3.0
0.5
1.5
2.5
3.5
100
1MHz
2MHz
75
85
65
95
LT8614
2
8614fc
For more information www.linear.com/LT8614
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
IN
, EN/UV, PG ..........................................................42V
BIAS .......................................................................... 30V
BST Pin Above SW Pin................................................4V
FB, TR/SS, RT, INTV
CC
. ..............................................4V
SYNC Voltage . ............................................................6V
Operating Junction Temperature Range (Note 2)
LT8614E ............................................. –40°C to 125°C
LT8614I .............................................. –40°C to 125°C
LT8614H ............................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8614EUDC#PBF LT8614EUDC#TRPBF LGGQ
18-Lead (3mm × 4mm) Plastic QFN
–40°C to 125°C
LT8614IUDC#PBF LT8614IUDC#TRPBF LGGQ
18-Lead (3mm × 4mm) Plastic QFN
–40°C to 125°C
LT8614HUDC#PBF LT8614HUDC#TRPBF LGGQ
18-Lead (3mm × 4mm) Plastic QFN
–40°C to 150°C
Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
l
2.9 3.4 V
V
IN
Quiescent Current V
EN/UV
= 0V
l
1.0
1.0
3
8
µA
µA
V
EN/UV
= 2V, Not Switching, V
SYNC
= 0V
l
1.7
1.7
4
10
µA
µA
V
EN/UV
= 2V, Not Switching, V
SYNC
= 2V 0.26 0.5 mA
V
IN
Current in Regulation V
OUT
= 0.97V, V
IN
= 6V, Output Load = 100µA
V
OUT
= 0.97V, V
IN
= 6V, Output Load = 1mA
l
l
21
210
50
350
µA
µA
Feedback Reference V
oltage V
IN
= 6V, I
LOAD
= 0.5A
V
IN
= 6V, I
LOAD
= 0.5A
l
0.964
0.958
0.970
0.970
0.976
0.982
V
V
20 19 18 17
7 8 9 10
TOP VIEW
UDC PACKAGE
18-LEAD (3mm × 4mm) PLASTIC QFN
1
BIAS
INTV
CC
BST
V
IN1
GND1
TR/SS
RT
EN/UV
V
IN2
GND2
GND1
SW
SW
GND2
FB
PG
GND
SYNC/MODE
16
15
14
13
11
2
3
4
6
21
SW
22
SW
θ
JA
= 40°C/W, θ
JC(PAD)
= 12°C/W
EXPOSED PAD (PINS 21, 22) ARE SW, SHOULD BE SOLDERED TO PCB
NOTE: PINS 5, 12 ARE REMOVED. CONFIGURA
TION DOES NOT MATCH
JEDEC 20-PIN PACKAGE OUTLINE
http://www.linear.com/product/LT8614#orderinfo
LT8614
3
8614fc
For more information www.linear.com/LT8614
ELECTRICAL CHARACTERISTICS
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 LT8614E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT8614I is guaranteed over the full –40°C to 125°C operating junction
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Feedback Voltage Line Regulation V
IN
= 4.0V to 42V, I
LOAD
= 0.5A
l
0.004 0.02 %/V
Feedback Pin Input Current V
FB
= 1V –20 20 nA
INTV
CC
Voltage I
LOAD
= 0mA, V
BIAS
= 0V
I
LOAD
= 0mA, V
BIAS
= 3.3V
3.23
3.25
3.4
3.29
3.57
3.35
V
V
INTV
CC
Undervoltage Lockout 2.5 2.6 2.7 V
BIAS Pin Current Consumption V
BIAS
= 3.3V, I
LOAD
= 1A, 2MHz 9 mA
Minimum On-Time I
LOAD
= 1.5A, SYNC = 0V
I
LOAD
= 1.5A, SYNC = 3.3V
l
l
15
15
30
30
45
45
ns
ns
Minimum Off-T
ime 80 110 ns
Oscillator Frequency R
T
= 221k, I
LOAD
= 1A
R
T
= 60.4k, I
LOAD
= 1A
R
T
= 18.2k, I
LOAD
= 1A
l
l
l
180
665
1.85
210
700
2.00
240
735
2.15
kHz
kHz
MHz
Top Power NMOS On-Resistance
I
SW
= 1A 85 mΩ
Top Power NMOS Current Limit
l
5.7 8.5 10 A
Bottom Power NMOS On-Resistance V
INTVCC
= 3.4V, I
SW
= 1A 40 mΩ
Bottom Power NMOS Current Limit V
INTVCC
= 3.4V
l
4.5 6.9 8.5 A
SW Leakage Current V
IN
= 42V, V
SW
= 0V, 42V –1.5 1.5 µA
EN/UV Pin Threshold EN/UV Rising
l
0.94 1.0 1.06 V
EN/UV Pin Hysteresis 40 mV
EN/UV Pin Current V
EN/UV
= 2V –20 20 nA
PG Upper Threshold Offset from V
FB
V
FB
Falling
l
6 9.0 12 %
PG Lower Threshold Offset from V
FB
V
FB
Rising
l
–6 –9.0 –12 %
PG Hysteresis 1.2 %
PG Leakage V
PG
= 3.3V –40 40 nA
PG Pull-Down Resistance V
PG
= 0.1V
l
650 2000 Ω
SYNC Threshold SYNC Falling
SYNC Rising
0.8
1.6
1.1
2.0
1.4
2.4
V
V
SYNC Pin Current V
SYNC
= 6V –40 40 nA
TR/SS Source Current
l
1.5 2.2 2.9 µA
TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V 200 Ω
temperature range. The LT8614H is guaranteed to meet performance
specifications from –40°C to 150°C operating junction temperature range.
High junction temperatures degrade operating lifetimes. Operating lifetime
is derated at junction temperatures greater than 125°C.
Note 3: This IC includes overtemperature protection that is intended to
protect the device during overload conditions. Junction temperature will
exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
will reduce lifetime.
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LT8614IUDC#PBF

Mfr. #:
Buy LT8614IUDC#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 42V, 4A Synchronous Step-Down SILENT SWITCHER with 2.5 A Quiescent Current
Lifecycle:
New from this manufacturer.
Delivery:
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