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LT8610EMSE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
LT8610
1
8610fa
For more information www.linear.com/LT8610
TYPICAL APPLICATION
FEATURES DESCRIPTION
42V, 2.5A Synchronous
Step-Down Regulator
with 2.5µA Quiescent
Current
The LT
®
8610 is a compact, high efficiency, high speed
synchronous monolithic step-down switching regulator
that consumes only 2.5µA 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 LT8610 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 LT8610 is available in a small
16-lead MSOP package with exposed pad for low thermal
resistance.
5V 2.5A Step-Down Converter 12V
IN
to 5V
OUT
Efficiency
APPLICATIONS
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
High Efficiency Synchronous Operation:
96% Efficiency at 1A, 5V
OUT
from 12V
IN
94% Efficiency at 1A, 3.3V
OUT
from 12V
IN
n
Fast Minimum Switch-On Time: 50ns
n
Low Dropout Under All Conditions: 200mV at 1A
n
Allows Use Of Small Inductors
n
Low EMI
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 16-Lead MSOP Package
n
Automotive and Industrial Supplies
n
General Purpose Step-Down
n
GSM Power Supplies
L, LT , LT C , 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
LT8610
GND
PGND
BIAS
8610 TA01a
FB
0.1µF
V
OUT
5V
2.5A
4.7µF
V
IN
5.5V TO 42V
1µF
10nF
10pF
4.7µH
1M
243k
f
SW
= 700kHz
60.4k
47µF
LOAD CURRENT (A)
0
EFFICIENCY (%)
80
90
100
2
8610 G01
70
60
75
85
95
65
55
50
0.5
1
1.5
2.5
V
IN
= 12V
V
IN
= 24V
f
SW
= 700kHz
LT8610
2
8610fa
For more information www.linear.com/LT8610
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)
LT8610E ................................................. –40 to 125°C
LT8610I .................................................. –40 to 125°C
LT8610H ................................................–40 to 150°C
Storage Temperature Range ......................–65 to 150°C
(Note 1)
1
2
3
4
5
6
7
8
SYNC
TR/SS
RT
EN/UV
V
IN
V
IN
PGND
PGND
16
15
14
13
12
11
10
9
FB
PG
BIAS
INTV
CC
BST
SW
SW
SW
TOP VIEW
17
GND
MSE PACKAGE
16-LEAD PLASTIC MSOP
θ
JA
= 40°C/W, θ
JC(PAD)
= 10°C/W
EXPOSED PAD (PIN 17) 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
LT8610EMSE#PBF LT8610EMSE#TRPBF 8610 16-Lead Plastic MSOP –40°C to 125°C
LT8610IMSE#PBF LT8610IMSE#TRPBF 8610 16-Lead Plastic MSOP –40°C to 125°C
LT8610HMSE#PBF LT8610HMSE#TRPBF 8610 16-Lead Plastic MSOP –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.
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
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 0.24 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
24
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
Feedback V
oltage 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 8.5 mA
Minimum On-Time I
LOAD
= 1A, SYNC = 0V
I
LOAD
= 1A, SYNC = 3.3V
l
l
30
30
50
45
70
65
ns
ns
Minimum Off-T
ime 50 80 110 ns
LT8610
3
8610fa
For more information www.linear.com/LT8610
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 LT8610E 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
LT8610I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT8610H is guaranteed over the full –40°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes. Operating lifetime is derated at 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
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 120 mΩ
Top Power NMOS Current Limit
l
3.5 4.8 5.8 A
Bottom Power NMOS On-Resistance V
INTVCC
= 3.4V, I
SW
= 1A 65 mΩ
Bottom Power NMOS Current Limit V
INTVCC
= 3.4V 2.5 3.3 4.8 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 1.3 %
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
0.8
1.6
1.1
2.0
1.4
2.4
V
V
SYNC Pin Current V
SYNC
= 2V –40 40 nA
TR/SS Source Current
l
1.2 2.2 3.2 µA
TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V 230 Ω
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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LT8610EMSE#PBF

Mfr. #:
Buy LT8610EMSE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 42V, 2.5A Synchronous Step-Down Regulator with 2.5uA Quiescent Current
Lifecycle:
New from this manufacturer.
Delivery:
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