OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LT8612EUDE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT8612
1
8612f
For more information www.linear.com/LT8612
Typical applicaTion
FeaTures DescripTion
42V, 6A Synchronous
Step-Down Regulator
with 3µA Quiescent
Curr
ent
The LT
®
8612 is a compact, high efficiency, high speed
synchronous monolithic step-down switching regulator
that consumes only 3µA of quiescent current. Top and
bottom power switches are included with all necessary
circuitry to minimize the need for external components.
Low ripple Burst Mode operation enables high efficiency
down to very low output currents while keeping the output
ripple below 10mV
P-P
. A SYNC pin allows synchronization
to an external clock. Internal compensation with peak cur-
rent mode
topology allows the use of small inductors and
results
in fast transient response and good loop stability.
The EN/UV pin has an accurate 1V threshold and can be
used to program V
IN
undervoltage lockout or to shut down
the LT8612 reducing the input supply current to 1µA. A
capacitor on the TR/SS pin programs the output voltage
ramp rate during start-up. The PG flag signals when V
OUT
is within ±9% of the programmed output voltage as well
as fault conditions. The LT8612 is available in a small
3mm × 6mm 28-lead QFN package with exposed pad for
low thermal resistance.
5V 6A Step-Down Converter
Efficiency at 5V
OUT
applicaTions
n
Wide Input Voltage Range: 3.4V to 42V
n
Ultralow Quiescent Current Burst Mode
®
Operation:
3μA I
Q
Regulating 12V
IN
to 3.3V
OUT
Output Ripple < 10mV
P-P
n
High Efficiency Synchronous Operation:
95% Efficiency at 3A, 5V
OUT
from 12V
IN
94% Efficiency at 3A, 3.3V
OUT
from 12V
IN
n
Fast Minimum Switch-On-Time: 40ns
n
Low Dropout Under All Conditions: 250mV at 3A
n
Allows Use Of Small Inductors
n
Safely Tolerates Inductor Saturation in Overload
Conditions
n
Adjustable and Synchronizable: 200kHz to 2.2MHz
n
Current Mode Operation
n
Accurate 1V Enable Pin Threshold
n
Internal Compensation
n
Output Soft-Start and Tracking
n
Small Thermally Enhanced 3mm × 6mm 28-Lead
QFN Package
n
Automotive and Industrial Supplies
n
General Purpose Step-Down
n
GSM Power Supplies
L, LT , LTC , LT M , Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
BSTV
IN
EN/UV
PG
SYNC
INTV
CC
TR/SS
RT
SW
LT8612
GND
PGND
BIAS
8612 TA01a
FB
0.1µF
V
OUT
5V
6A
10µF
V
IN
5.6V TO 42V
1µF
10nF
10pF
3.9µH
1M
243k
f
SW
= 700kHz
L: EPCOS B82559
60.4k
100µF
1210
LOAD CURRENT (A)
0
EFFICIENCY (%)
65
70
75
100
85
2
4
5 6
8612 TA01b
60
90
95
80
1
3
f
SW
= 700kHz
L = 3.9µH
V
IN
= 24V
V
IN
= 12V
LT8612
2
8612f
For more information www.linear.com/LT8612
pin conFiguraTionabsoluTe MaxiMuM raTings
V
IN
, EN/UV, PG ..........................................................42V
BIAS .......................................................................... 25V
BST Pin Above SW Pin................................................4V
FB, TR/SS, RT, INTV
CC
. ..............................................4V
SYNC Voltage . ............................................................6V
Operating Junction Temperature Range (Note 2)
LT8612E ................................................. –40 to 125°C
LT8612I .................................................. –40 to 125°C
Storage Temperature Range ......................–65 to 150°C
(Note 1)
11
TOP VIEW
29
GND
UDE PACKAGE
28-LEAD (3mm × 6mm) PLASTIC QFN
12 13 14
28 27 26 25
6
5
4
3
2
1
SYNC
TR/SS
RT
EN/UV
V
IN
V
IN
V
IN
PGND
PGND
PGND
FB
PG
BIAS
INTV
CC
BST
SW
SW
SW
SW
SW
GND
GND
GND
GND
GND
GND
GND
GND
7
19
20
21
22
23
24
18
8
9
10
17
16
15
θ
JA
= 40°C/W, θ
JC(PAD)
= 5°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
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
LT8612EUDE#PBF LT8612EUDE#TRPBF LGHW 28-Lead (3mm × 6mm) Plastic QFN –40°C to 125°C
LT8612IUDE#PBF LT8612IUDE#TRPBF LGHW 28-Lead (3mm × 6mm) Plastic QFN –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LT C Marketing for information on non-standard lead based finish parts.
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/
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
l
2.9 3.4 V
V
IN
Quiescent Current V
EN/UV
= 0V, V
SYNC
= 0V
l
1.0
1.0
5
20
µA
µA
V
EN/UV
= 2V, Not Switching, V
SYNC
= 0V
l
1.7
1.7
6
20
µA
µA
V
EN/UV
= 2V, Not Switching, V
SYNC
= 2V 0.3 0.6 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
24
230
60
370
µA
µA
Feedback Reference V
oltage V
IN
= 12V, I
LOAD
= 500mA
V
IN
= 12V, I
LOAD
= 500mA
l
0.964
0.958
0.970
0.970
0.976
0.982
V
V
Feedback V
oltage Line Regulation V
IN
= 4.0V to 25V, I
LOAD
= 0.5A
l
0.004 0.025 %/V
Feedback Pin Input Current V
FB
= 1V –20 0.5 20 nA
LT8612
3
8612f
For more information www.linear.com/LT8612
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 LT8612E 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
LT8612I is guaranteed over the full –40°C to 125°C operating junction
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
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
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 2.4 2.6 2.8 V
BIAS Pin Current Consumption V
BIAS
= 3.3V, I
LOAD
= 1A, 2MHz 14 mA
Minimum On-Time I
LOAD
= 2A, SYNC = 0V
I
LOAD
= 2A, SYNC = 3.3V
l
l
20
20
40
35
60
55
ns
ns
Minimum Off-T
ime 50 85 120 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 65 mΩ
Top Power NMOS Current Limit
l
7.5 9.7 12.0 A
Bottom Power NMOS On-Resistance V
INTVCC
= 3.4V, I
SW
= 1A 29 mΩ
Bottom Power NMOS Current Limit V
INTVCC
= 3.4V
l
6 10 12 A
SW Leakage Current V
IN
= 42V, V
SW
= 0V, 42V –6 0.1 6 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 1 20 nA
PG Upper Threshold Offset from V
FB
V
FB
Falling
l
6.5 9.0 11.5 %
PG Lower Threshold Offset from V
FB
V
FB
Rising
l
–6.5 –9.0 –11.5 %
PG Hysteresis 1.3 %
PG Leakage V
PG
= 3.3V –40 40 nA
PG Pull-Down Resistance V
PG
= 0.1V
l
680 2000 Ω
SYNC Threshold SYNC Falling
SYNC Rising
0.7
1.0
1.0
1.3
1.4
1.55
V
V
SYNC Pin Current V
SYNC
= 2V –40 40 nA
TR/SS Source Current
l
1.4 2.1 2.7 µA
TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V 230 Ω
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.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT8612EUDE#PBF

Mfr. #:
Buy LT8612EUDE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 42V, 6A Synchronous Step-Down Regulator with 2.5uA Quiescent Current
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet