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LT8471EFE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
LT8471
1
8471fd
For more information www.linear.com/8471
Typical applicaTion
FeaTures DescripTion
Dual Multitopology
DC/DC Converters with 2A
Switches and Synchr
onization
The LT
®
8471 is a dual PWM DC/DC converter containing
two internal 2A, 50V switches and an additional 500mA
switch to facilitate step-down and inverting conversion.
Each 2A channel can be independently configured as a
buck, boost, SEPIC, flyback or inverting converter. Ca
-
pable of
generating positive and negative outputs from a
single
input rail, the LT8471 is ideal for many local power
supply designs.
The LT8471 has an adjustable oscillator, set by a resistor
placed from the RT pin to ground. Additionally, the LT8471
can be synchronized to an external clock. The free running
or synchronized switching frequency range of the part can
be set between 100kHz and 2MHz.
Additional features such as frequency foldback, soft-start,
and power good are integrated. The LT8471 is available in
20-lead TSSOP and 28-Lead (4mm × 5mm) QFN packages.
6V to 32V to ±5V, Dual DC/DC Converter Efficiency and Power Loss
Load from V
OUT1
to V
OUT2
applicaTions
n
Dual 2A and One 500mA, 50V Internal Power
Switch Channels
n
2A Primary Channels Can Be Buck, Boost, SEPIC,
ZETA, Flyback or Inverting DC/DC Converter
n
500mA Skyhook Channel Efficiently Generates
Boosted Input Voltage
n
Wide Input Voltage Range of 2.6V to 50V
n
UVLO and OVLO Programmable on OV/UV Pin
n
Soft-Start Programmable for Each Channel
n
Fixed Frequency PWM (Set by RT Pin or
Synchronized to External Clock)
n
Anti-Phase Switching Reduces Input Ripple
n
20-Lead TSSOP and 28-Lead QFN Packages
n
Dual Rail Power for Signal Chain.
n
Buck/Buck, Buck/Boost, Boost/Boost, Boost/Invert,
Invert/Invert, Buck/Invert
L, LT, LTC , LT M, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
RTSYNC
LT8471
8471 TA01a
SHOUT
V
IN2
V
IN1
SS2
C3
C1
C2
SS1
OV/UV
E1
FB2
E2
GND
FB1
V
OUT1
5V
1.5A
V
OUT2
–5V
0.65A
47µF
×2
10µH
15µH
1µF
2.2µF 2.2µF
0.1µF
187k
2.2µF
PG1
PG2
59k
316k
316k
59k
1µF
47µF
×2
0.1µF
6V TO 32V
10µH
100k
100k
475k
POWER LOSS
0
20
40
60
80
10
30
50
70
90
LOAD CURRENT (A)
EFFICIENCY (%)
POWER LOSS (W)
0
1
3
2
4
8471 F10b
0
0.2
0.4 0.6 0.8 1.0
EFFICIENCY
6V
18V
32V
V
CC
=
LT8471
2
8471fd
For more information www.linear.com/8471
absoluTe MaxiMuM raTings
V
IN1
, V
IN2
Voltages ..................................... –0.3V to 50V
C1, C2 Voltages .......................................... –0.4V to 50V
E1, E2 Voltages ........................................... –60V to 50V
V
C1
to V
E1
and V
C2
to V
E2
Voltages ............ –0.4V to 60V
V
IN1
to V
E1
and V
IN2
to V
E2
Voltages
Low Si
de Configurations (Note 6) .......... –0.4V to 40V
High Side Configurations (Note 6) ......... –0.4V to 60V
V
IN1
to V
C1
and V
IN2
to V
C2
Voltages
High Side Configurations (Note 6) ......... –0.4V to 40V
C3 Voltage ................................................. –0.4V to 50V
RT Voltage ................................................... –0.3V to 5V
SYNC Voltage ............................................ –0.3V to 5.5V
(Note 1)
pin conFiguraTion
FE PACKAGE
20-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
C1
E1
V
IN1
PG1
FB1
OV/UV
RT
SS1
SYNC
GND
C2
E2
V
IN2
PG2
FB2
SS2
SHOUT
C3
GND
GND
21
GND
θ
JA
= 38°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
9 10
TOP VIEW
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
11 12 13
28 27 26 25 24
14
23
6
5
4
3
2
1
E1
V
IN1
PG1
FB1
OV/UV
RT
SS1
SYNC
E2
V
IN2
PG2
FB2
SS2
SHOUT
C3
NC
NC
NC
C1
C2
NC
NC
GND
GND
GND
GND
GND
GND
7
17
18
19
20
21
22
16
8
15
29
GND
θ
JA
= 44°C/W, θ
JC
= 8°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
SS1, SS2 ................................................... –0.3V to 2.5V
FB1, FB2 Voltages ..................................... –2.5V to 2.5V
PG1, PG2 Voltages ..................................... –0.3V to 50V
OV/UV Voltage ............................................. –0.3V to 5V
SHOUT Voltage ......................................... –0.3V to 50V
Operating Junction Temperature Range
LT8471E (Notes 2, 5) ......................... –40°C to 125°C
LT8471I (Notes 2, 5) .......................... –40°C to 125°C
LT8471H (Notes 2, 5) .........................–40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
FE Package .......................................................300°C
LT8471
3
8471fd
For more information www.linear.com/8471
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8471EFE#PBF LT8471EFE#TRPBF LT8471FE 20-Lead Plastic TSSOP –40°C to 125°C
LT8471IFE#PBF LT8471IFE#TRPBF LT8471FE 20-Lead Plastic TSSOP –40°C to 125°C
LT8471HFE#PBF LT8471HFE#TRPBF LT8471FE 20-Lead Plastic TSSOP –40°C to 150°C
LT8471EUFD#PBF LT8471EUFD#TRPBF 8471 28-LEAD (4mm × 5mm) Plastic QFN –40°C to 125°C
LT8471IUFD#PBF LT8471IUFD#TRPBF 8471 28-LEAD (4mm × 5mm) 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 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/
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage (V
IN1
, V
IN2
)
l
2.6 50 V
Quiescent Current (V
IN1
, Skyhook Disabled) V
OV/UV
= 1.3V, Not Switching 2.2 3.3 mA
Quiescent Current (V
IN1
, Skyhook Enabled) V
OV/UV
= 1.3V, C3 = 5V, Not Switching 2.4 4 mA
Quiescent Current (V
IN2
) V
OV/UV
= 1.3V, Not Switching 29 42 µA
Quiescent Current in Shutdown (V
IN1
+ V
IN2
) V
OV/UV
= 0V 0.01 1 μA
Positive Feedback Voltage (FB1, FB2)
l
773 789 805 mV
Negative Feedback Voltage
(FB1, FB2)
(LT8471E,I)
(LT8471H)
l
l
–806
–806
–788
–788
–770
–767
mV
mV
Feedback Pin Bias Current (FB1, FB2) V
FB
= Positive Feedback Voltage, Current Out of Pin
V
FB
= Negative Feedback Voltage
–100
30
0
200
100
nA
nA
Error Amp Transconductances Primary Channels, ∆I = 2μA 70 μmhos
Error Amp Voltage Gains Primary Channels 95 V/V
Reference Line Regulation 2.6V ≤ V
IN1
≤ 50V 0.008 0.05 %/V
Switching Frequency, f
OSC
R
T
= 46.4k
R
T
= 732k
l
l
1.55
100
1.8
117
2.05
135
MHz
kHz
Switching Frequency in Foldback All Channels. Compared to Normal f
OSC
1/8 Ratio
Switching Frequency Range Synchronizing
l
100 2000 kHz
SYNC High Level for Sync
l
1.3 V
SYNC Low Level for Sync
l
0.4 V
SYNC Clock Pulse Duty Cycle V
SYNC
= 0V to 2V 35 65 %
Recommended Minimum SYNC Ratio f
SYNC
/f
OSC
¾ Ratio
Switching Phase Between Primary Channels R
T
= 46.4k
R
T
= 732k
170
170
200
200
Deg
Deg
Skyhook Boost Voltage V
SHOUT
– V
C2
, Skyhook Enabled 3.0 4.25 5.4 V
Minimum Switch Off-Time Primary Channels (Note 7)
Skyhook Channel (Note 7)
170
100
ns
ns
Minimum Switch On-Time Primary Channels(Note 7)
Skyhook Channel (Note 7)
220
30
ns
ns
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
= V
IN2
= 5V, unless otherwise noted (Note 2).
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LT8471EFE#TRPBF

Mfr. #:
Buy LT8471EFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual Multitopology DC/DC Converters with 2.5A Switches and Synchronization
Lifecycle:
New from this manufacturer.
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