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Linear Technology Electronic Components Datasheet

LTC7812 Datasheet

38V Synchronous Boost+Buck Controller

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LTC7812
Low IQ, 38V Synchronous
Boost+Buck Controller
Features
n Synchronous Boost and Buck Controllers
n When Cascaded, Allows VIN Above, Below or Equal
to Regulated VOUT
n Output Remains in Regulation Through Input Dips
(e.g., Cold Crank) Down to 2.5V
n Wide Bias Input Voltage Range: 4.5V to 38V
n Low Input and Output Ripple
n Low EMI
n Fast Output Transient Response
n High Light Load Efficiency
n Low Operating IQ: 33µA (Both Channels On)
n Low Operating IQ: 28µA (Buck Channel On)
n RSENSE or Lossless DCR Current Sensing
n Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
n Boost Output Voltage Up to 60V
n Phase-Lockable Frequency (75kHz to 850kHz)
n Small 32-Pin 5mm × 5mm QFN Package
Applications
n Automotive and Industrial Power Systems
n High Power Battery Operated Systems
Description
The LTC®7812 is a high performance synchronous
Boost+Buck DC/DC switching regulator controller that
drives all N-channel power MOSFET stages. It contains
independent step-up (boost) and step-down (buck) control-
lers that can regulate two separate outputs or be cascaded
to regulate an output voltage from an input voltage that
can be above, below or equal to the output voltage. The
LTC7812 operates from a wide 4.5V to 38V input supply
range. When biased from the output of the boost regulator,
the LTC7812 can operate from an input supply as low as
2.5V after start-up. The 33μA no-load quiescent current
extends operating run time in battery-powered systems.
Unlike conventional buck-boost regulators, the LTC7812’s
cascaded Boost+Buck solution has continuous, non-
pulsating, input and output currents, substantially reducing
voltage ripple and EMI. The LTC7812 has independent
feedback and compensation points for the boost and buck
regulation loops, enabling a fast output transient response
that can be easily optimized externally.
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP and µModule are registered trademarks and
No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
VIN
5V TO 38V
DOWN TO
2.5V AFTER
START-UP
+ 33µF
6.8µF
2mΩ
Wide Input Range to 12V/8A Low IQ, Cascaded Boost+Buck Regulator
1µH
VMID, 14V**
4.7µH
3mΩ
6.8µF + 33µF 499k
499k
22µF + 47µF
VOUT
12V
8A*
46.4k
35.7k
0.1µF
4.7µF
0.1µF
SENSE2+ SENSE2BG2 SW2 BOOST2 TG2
INTVCC
PGND VFB2 VBIAS TG1 BOOST1 SW1 BG1 SENSE1+ SENSE1VFB1
LTC7812
EXTVCC
RUN1 RUN2 ITH1
ITH2 TRACK/SS1 SS2 FREQ PLLIN/MODE SGND
15k
100pF
4.7nF
1.86k
820pF
6.8nF
0.1µF
0.01µF
* WHEN VIN < 8V, MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED
** VMID = 14V WHEN VIN < 14V
VMID FOLLOWS VIN WHEN VIN > 14V
7812 TA01a
For more information www.linear.com/LTC7812
7812fa
1


Linear Technology Electronic Components Datasheet

LTC7812 Datasheet

38V Synchronous Boost+Buck Controller

No Preview Available !

LTC7812
Absolute Maximum Ratings
(Note 1)
Bias Input Supply Voltage (VBIAS)............... –0.3V to 40V
Buck Top Side Driver Voltage (BOOST1)..... –0.3V to 46V
Boost Top Side Driver Voltage (BOOST2)..... –0.3V to 76V
Buck Switch Voltage (SW1) .......................... –5V to 40V
Boost Switch Voltage (SW2) ......................... –5V to 70V
INTVCC, (BOOST1–SW1),
(BOOST2–SW2)....................................... –0.3V to 6V
RUN1, RUN2 ................................................ –0.3V to 8V
Maximum Current Sourced Into Pin
from Source >8V...............................................100µA
BG1, BG2, TG1, TG2............................................ (Note 8)
SENSE1+, SENSE1Voltages....................... –0.3V to 28V
SENSE2+, SENSE2Voltages...................... –0.3V to 40V
FREQ Voltage.........................................–0.3V to INTVCC
EXTVCC....................................................... –0.3V to 14V
ITH1, ITH2, VFB1, VFB2, Voltages..................... –0.3V to 6V
PLLIN/MODE, PGOOD1, OV2 Voltages ......... –0.3V to 6V
TRACK/SS1, SS2 Voltages ........................... –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC7812E, LTC7812I........................... –40°C to 125°C
LTC7812H........................................... –40°C to 150°C
Storage Temperature Range............... –65°C to 150°C
Pin Configuration
TOP VIEW
32 31 30 29 28 27 26 25
SW1 1
TG1 2
24 INTVCC
23 NC
PGOOD1 3
22 OV2
TRACK/SS1 4
ITH1 5
VFB1 6
SENSE1+ 7
SENSE18
33
PGND
21 SGND
20 SGND
19 RUN2
18 SGND
17 RUN1
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 150°C, qJA = 44°C/W
EXPOSED PAD (PIN 33) IS PGND, MUST BE SOLDERED TO PCB
Order Information http://www.linear.com/product/LTC7812#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC7812EUH#PBF
LTC7812EUH#TRPBF
7812
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
LTC7812IUH#PBF
LTC7812IUH#TRPBF
7812
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
LTC7812HUH#PBF
LTC7812HUH#TRPBF
7812
32-Lead (5mm × 5mm) Plastic QFN
–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.
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.
7812fa
2 For more information www.linear.com/LTC7812


Part Number LTC7812
Description 38V Synchronous Boost+Buck Controller
Maker Linear Technology
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LTC7812 Datasheet PDF






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