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Linear Technology Electronic Components Datasheet

LT8616 Datasheet

Dual 42V Synchronous Monolithic Step-Down Regulator

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LT8616 pdf
Features
LT8616
Dual 42V Synchronous
Monolithic Step-Down Regulator
with 6.5µA Quiescent Current
Description
n Wide Input Voltage Range: 3.4V to 42V
n 2.5A and 1.5A Buck Regulators with Separate Inputs
n Fast Minimum Switch On-Time: 35ns
n Ultralow Quiescent Current Burst Mode® Operation:
n 6.5µA IQ Regulating 12VIN to 5VOUT and 3.3VOUT
n Output Ripple < 15mV
n 180° Out of Phase Switching
n Adjustable and Synchronizable: 200kHz to 3MHz
n Accurate 1V Enable Pin Thresholds
n Internal Compensation
n Output Soft-Start and Tracking
n TSSOP Package: Output Stays at or Below Regulation
Voltage During Adjacent Pin Short or When a Pin Is
Left Floating
n Thermally Enhanced 28-Lead TSSOP Package
Applications
n Automotive and Industrial Supplies
n General Purpose Step-Down
The LT®8616 is a high efficiency, high speed, dual synchro-
nous monolithic step-down switching regulator that con-
sumes only 6.5µA of quiescent current with both channels
enabled. Both channels contain all switches and necessary
circuitry to minimize the need for external components.
Low ripple Burst Mode operation enables high efficiency
down to very low output currents while minimizing output
ripple. A SYNC pin allows synchronization to an external
clock. Internal compensation with peak current mode
topology allows the use of small inductors and results in
fast transient response and good loop stability. The en-
able pins have accurate 1V thresholds and can be used to
program undervoltage lockout. Capacitors on the TR/SS
pins programs the output voltage ramp rate during start-
up while the PG pins signal when each output is within
10% of the programmed output voltage. The LT8616 is
available in a TSSOP package for high reliability.
L, LT, LTC, LTM, 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.
Typical Application
5V, 3.3V, 700kHz Step-Down Converter
VIN
12V
VIN1 BOOST1
4.7µF
EN/UV1
4.7µF
1M
10nF
1µF
56.2k
VIN2
EN/UV2
SW1
FB1
LT8616
PG1
PG2
SYNC/MODE
BIAS
BOOST2
TR/SS1
TR/SS2
INTVCC
SW2
RT GND FB2
0.1µF
10µH
1M
187k
0.1µF
4.7µH
1M
316k
5.6pF
VOUT1
5V, 1.5A
47µF
10pF
VOUT2
3.3V, 2.5A
2 x 47µF
8616 TA01a
100
90
80
70
60
50
40
30
0.01
0.1
Efficiency
VIN1 = VIN2 = 12V
fSW = 700kHz
1 10
LOAD (mA)
CH1, 5VOUT
CH2, 3.3VOUT
100 1000
8616 TA01b
For more information www.linear.com/LT8616
8616f
1


Linear Technology Electronic Components Datasheet

LT8616 Datasheet

Dual 42V Synchronous Monolithic Step-Down Regulator

No Preview Available !

LT8616 pdf
LT8616
Absolute Maximum Ratings
(Note 1)
VIN1, VIN2, EN/UV1, EN/UV2, PG1, PG2......................42V
BIAS...........................................................................30V
BST1 Above SW1, BST2 Above SW2, FB1, FB2,
TR/SS1, TR/SS2......................................................4V
SYNC/MODE................................................................6V
Operating Junction Temperature Range (Note 2)
LT8616E.............................................. –40°C to 125°C
LT8616I............................................... –40°C to 125°C
LT8616H............................................. –40°C to 150°C
Storage Temperature Range................... –60°C to 150°C
Pin Configuration
EN/UV2 1
PG2 2
SW2 3
SW2 4
SW2 5
BOOST2 6
NC 7
BOOST1 8
SW1 9
SW1 10
PG1 11
TR/SS1 12
FB1 13
FB1 14
TOP VIEW
29
GND
28 TR/SS2
27 FB2
26 FB2
25 NC
24 VIN2
23 NC
22 BIAS
21 INTVCC
20 NC
19 VIN1
18 NC
17 SYNC/MODE
16 EN/UV1
15 RT
FE PACKAGE
28-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 30°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT8616EFE#PBF
LT8616EFE#TRPBF
LT8616FE
28-Lead Plastic TSSOP
–40 to 125°C
LT8616IFE#PBF
LT8616IFE#TRPBF
LT8616FE
28-Lead Plastic TSSOP
–40 to 125°C
LT8616HFE#PBF
LT8616HFE#TRPBF
LT8616FE
28-Lead Plastic TSSOP
–40 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/
8616f
2 For more information www.linear.com/LT8616


Part Number LT8616
Description Dual 42V Synchronous Monolithic Step-Down Regulator
Maker Linear Technology
Total Page 24 Pages
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