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LT8631IFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LT8631
1
8631fa
For more information www.linear.com/LT8631
V
IN
LT8631
V
IN
6.5V TO 100V
V
OUT
5V, 1A
2.2µF
0.1µF
22µH
1M
191k
0.1µF
2.2µF
25.5k
F
SW
= 400kHz
8631 TA01a
EN/UV
PG
INTV
CC
RT
SYNC/MODE
BST
SW
IND
GND
V
OUT
FB
TR/SS
47µF
4.7pF
TYPICAL APPLICATION
FEATURES DESCRIPTION
100V, 1A Synchronous
Micropower Step-Down
Regulator
The LT
®
8631 is a current mode PWM step-down DC/DC
converter with internal synchronous switches that provide
current for output loads up to 1A. The wide input range
of 3V to 100V makes the LT8631 suitable for regulating
power from a wide variety of sources, including automotive
and industrial systems and 36V to 72V telecom supplies.
Low ripple Burst Mode operation enables high efficiency
operation down to very low output currents while keeping
the output ripple below 10mV
P-P
. Resistor programmable
100kHz to 1MHz frequency range and synchronization ca-
pability enable
optimization
between efficiency and external
component size. The soft-start feature controls the ramp
rate of the output voltage, eliminating input current surge
during start-up, while also providing output tracking. A
power good flag signals when the output voltage is within
±7.5% of the regulated output. Undervoltage lockout can
be programmed using the EN/UV pin. Shutdown mode
reduces the total quiescent current to < 5µA. The LT8631
is available in a 20-lead TSSOP package with exposed pad
for low thermal resistance and high voltage lead spacing.
APPLICATIONS
L, LT, LTC , LT M, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
n
Ultrawide Input Voltage Range: 3V to 100V
n
Output Voltage Range: 0.8V to 60V
n
Internal Synchronous Switches
n
Low Ripple Burst Mode
®
Operation:
16µA I
Q
at 12V
IN
to 5V
OUT
Output Ripple <10mV
P-P
7µA I
Q
at 48V
IN
to 5V
OUT
Output Ripple <10mV
P-P
n
Low Dropout: 99% Maximum Duty Cycle
n
Peak Current Mode Control
n
Fixed Frequency Operation: 100kHz to 1MHz
n
Synchronization Input
n
Programmable Undervoltage Lockout
n
Power Good Flag
n
Flexible Output Voltage Tracking
n
Short-Circuit Protection
n
Low Shutdown Current: 5µA
n
Tolerates Pin Open/Short Faults
n
Thermally Enhanced 20-Lead TSSOP with High
Voltage Lead Spacing
n
Automotive Supplies
n
Telecom Supplies
n
Distributed Supply Regulation
5V, 1A Step-Down Converter Efficiency vs Load Current
LOAD CURRENT (A)
0
EFFICIENCY (%)
95
90
80
70
85
75
65
60
55
50
0.40.2 0.6 0.7 0.8 0.9
8631 TA01b
10.30.1 0.5
F
SW
= 400kHz
V
IN
= 12V
V
IN
= 24V
V
IN
= 48V
LT8631
2
8631fa
For more information www.linear.com/LT8631
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
(Note 1)
FE PACKAGE
VARIATION FE20(16)
20-LEAD PLASTIC TSSOP
1
3
5
6
7
8
9
10
TOP VIEW
20
18
16
15
14
13
12
11
V
IN
EN/UV
PG
NC
SYNC/MODE
RT
NC
TR/SS
SW
BST
INTV
CC
NC
IND
NC
V
OUT
FB
21
GND
θ
JA
= 40°C/W, θ
JC(PAD)
= 10°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8631EFE#PBF LT8631EFE#TRPBF LT8631FE 20-Lead Plastic TSSOP –40°C to 125°C
LT8631IFE#PBF LT8631IFE#TRPBF LT8631FE 20-Lead Plastic TSSOP –40°C to 125°C
LT8631HFE#PBF LT8631HFE#TRPBF LT8631FE 20-Lead Plastic TSSOP –40°C to 150°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 LTC Marketing for information on nonstandard 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/. Some packages are available in 500 unit reels through
designated
sales channels with #TRMPBF suffix.
V
IN
, EN/UV, PG ........................................................100V
IND, V
OUT
, ...................................................... 60V/–0.3V
SYNC/MODE ...............................................................6V
FB, TR/SS ...................................................................4V
Operating Junction Temperature Range
LT8631EFE (Note 2) ............................... –40°C to 125°C
LT8631IFE (Note 2) ................................ –40°C to 125°C
LT8631HFE (Note 2) ............................... –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
http://www.linear.com/product/LT8631#orderinfo
LT8631
3
8631fa
For more information www.linear.com/LT8631
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
EN/UV Voltage Threshold V
EN/UV
Rising
l
1.14 1.19 1.24 V
EN/UV Voltage Hysterisis 13 17 25 mV
EN/UV Input Current 5 100 nA
V
IN
Undervoltage Lockout V
FB
= 0.9V
l
2.74 2.8 3.05 V
Quiescent Current from V
IN
V
EN/UV
= 0V
V
FB
= 0.9V, V
VOUT
= 0V
V
FB
= 0.9V, V
VOUT
= 5V
l
l
l
5
16
3.6
11
50
8.0
µA
µA
µA
Quiescent Current from V
OUT
V
FB
= 0.9V, V
VOUT
= 5V
l
10 45 µA
V
IN
Current in Regulation V
VOUT
= 5V, I
LOAD
= 100µA
V
VOUT
= 5V, V
SYNC/MODE
= 2V, I
LOAD
= 100µA
V
VOUT
= 5V, I
LOAD
= 1mA
90
180
475
160
350
650
µA
µA
µA
Feedback Bias Current V
FB
= 0.8V –25 –15 nA
Feedback Voltage (V
FBREF
) V
VOUT
= 5V, I
LOAD
= 100mA
l
796 808 820 mV
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
V
IN
= 7V to 100V, V
OUT
= 5V, I
LOAD
= 500mA
V
IN
= 15V, V
OUT
= 5V, I
LOAD
= 100mA to 1A
–1.5
0.01
–0.3
0.2 %/V
%/A
Track/Soft-Start Source Current V
FB
= 0.9V, V
TR/SS
= 0 –6.5 –4.5 –2.5 µA
Track/Soft-Start VOH V
FB
= 0.9V 2.9 3.0 3.2 V
Track/Soft-Start Sink Current V
FB
= 0.9V, V
TR/SS
= 0.1V 15 30 45 µA
Track/Soft-Start VOL V
FB
= 0V 50 75 mV
Track/Soft-Start to Feedback Offset V
TR/SS
= 0.4V, V
VOUT
= 5V, I
LOAD
= 100mA –25 5 25 mV
Track/Soft-Start Sink Current POR (Note 4) V
FB
= 0.9V, V
TR/SS
= 0.2V 180 230 µA
PG Leakage Current V
FB
= 0V, V
PG
= 100V –200 0 200 nA
PG Lower Threshold % of V
FBREF
(Note 5) V
FB
Rising
l
–10.5 –7.5 –4.5 %
PG Upper Threshold % of V
FBREF
(Note 5) V
FB
Falling
l
4.5 7.5 10.5 %
PG Hysterisis (Note 5) 1.4 1.9 2.3 %
PG Sink Current V
FB
= 0.7V, V
PG
= 0.2V 900 µA
Switching Frequency R
RT
=187kΩ, V
VOUT
= 5V, I
LOAD
= 100mA
R
RT
= 19.6kΩ, V
VOUT
= 5V, I
LOAD
= 100mA
R
RT
= 8.66kΩ, V
VOUT
= 5V, I
LOAD
= 100mA
l
75
460
925
100
500
1000
125
540
1075
kHz
kHz
kHz
Minimum Switch ON T
ime V
IN
= 15V, R
RT
= 8.66kΩ, V
VOUT
= 1.5V, I
LOAD
= 500mA 100 120 ns
Minimum Switch OFF Time V
IN
= 5V, R
RT
= 8.66kΩ, V
VOUT
= 5V, I
LOAD
= 500mA 190 ns
IND to V
OUT
Burst Current (Note 6) 280 mA
IND to V
OUT
Peak Current (Note 7) 1.4 2.1 2.8 A
Maximum V
OUT
Current in Regulation V
IN
= 7.5V, R
RT
= 19.6kΩ, V
VOUT
= 5V, L = 15µH
V
IN
= 50V, R
RT
= 19.6kΩ, V
VOUT
= 5V, L = 15µH
l
1.00
1.2
1.35
1.8
1.8
2.4
A
A
Switch Pin Leakage Current V
SW
= 0V
V
SW
= 100V, V
IN
=100V
50
0.5
500
2.0
nA
µA
Top Switch On-Resistance 775 mΩ
Bottom Switch On-Resistance 550 mΩ
BST Pin Current V
BST
= 18V 180 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 15V, V
EN/UV
= 2V, unless otherwise specified. (Note 2)
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LT8631IFE#PBF

Mfr. #:
Buy LT8631IFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 100V, 1A Synchronous Micropower Step-Down Regulator
Lifecycle:
New from this manufacturer.
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