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LTC7810 Datasheet

2-Phase Synchronous Step-Down DC/DC Controller

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LTC7810
150V Low IQ, Dual, 2-Phase
Synchronous Step-Down DC/DC Controller
FEATURES
nn Wide VIN Range: 4.5V to 140V (150V Abs Max)
nn Wide Output Voltage Range: 1V ≤ VOUT ≤ 60V
nn Low Operating IQ: 16μA (48VIN to 12VOUT and 3.3VOUT)
nn Adjustable Gate Drive Level Up to 10V
nn Optional Spread Spectrum Operation
nn Very Low Dropout: 100% Duty Cycle Operation
nn Low IQ in Dropout: 78µA (One Channel On)
nn RSENSE or Inductor DCR Current Sensing
nn Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
nn Phase-Lockable Frequency (75kHz to 720kHz)
nn Programmable Fixed Frequency (50kHz to 750kHz)
nn Selectable Continuous, Pulse-Skipping, or Low Ripple
Burst Mode® Operation at Light Loads
nn Onboard LDO or External NMOS LDO for DRVCC
nn EXTVCC LDO Powers Drivers from VOUT
nn Programmable Input Overvoltage Lockout
nn 48-Lead (7mm × 7mm) eLQFP Package
APPLICATIONS
nn Automotive and Transportation
nn Industrial and Telecommunications
nn Military/Avionics
DESCRIPTION
The LTC®7810 is a high performance dual step-down DC/
DC switching regulator controller that drives all N-channel
synchronous power MOSFET stages that can operate
from voltages up to 140V. A constant frequency current
mode architecture allows a phase-lockable frequency of
up to 720kHz.
The low no-load quiescent current extends operating run
time in battery-powered systems. The LTC7810 features
a precision 1V reference, enabling the output voltage to
be programmed from 1V to 60V. The gate drive voltage
for the LTC7810 can be programmed to 6V, 8V, or 10V
to allow the use of logic-level or standard-threshold FETs
and to maximize efficiency.
The LTC7810 additionally features spread spectrum oper-
ation which significantly reduces the peak radiated and
conducted noise on both the input and output supplies,
making it easier to comply with electromagnetic interfer-
ence (EMI) standards.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
High Efficiency Dual 12V/ 5V Output Step-Down Regulator with Spread Spectrum
VIN
12.5V to 140V
10µH
0.1µF
RUN1 VIN
BOOST1
TG1
RUN2 DRVCC
BOOST2
TG2
SW1 SW2
LTC7810
BG1 BG2
DRVCC
2.2µF
0.1µF
33µH
VOUT1
5V / 6A
470µF
8mΩ
220k
55k
12.1k
1.5nF
0.1µF
SENSE1+
SENSE2+
SENSE1
SENSE2
EXTVCC
VFB1
ITH1
TRACK/SS1
DRVSET
INTVCC
PLLIN/SPREAD
VFB2
ITH2
TRACK/SS2
NDRV
MODE
REGSD
OVLO GND FREQ
0.1µF
DRVCC
10mΩ
22pF 220k
0.1µF
20k
17.4k
1.5nF
7810 TA01a
VOUT2
12V / 5A
150µF
Document Feedback
For more information www.analog.com
Efficiency and Power Loss
vs Load Current
100 VOUT = 12V
90
EFFICIENCY
80
POWER LOSS
70
100
10
1
0.1
60
50
0.001
0.01 0.1
VIN = 24V 0.01
VIN = 72V
VIN = 140V 0.001
1 10
LOAD CURRENT (A)
7810 TA01b
Rev. A
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC7810 Datasheet

2-Phase Synchronous Step-Down DC/DC Controller

No Preview Available !

LTC7810
TABLE OF CONTENTS
Features...................................................... 1
Applications................................................. 1
Typical Application ......................................... 1
Description.................................................. 1
Absolute Maximum Ratings............................... 3
Order Information........................................... 3
Pin Configuration........................................... 3
Electrical Characteristics.................................. 4
Typical Performance Characteristics.................... 7
Pin Functions............................................... 10
Functional Diagram....................................... 12
Operation................................................... 13
Main Control Loop................................................... 13
Power and Bias Supplies (VIN, NDRV, EXTVCC,
DRVCC, REGSD)....................................................... 13
Boost Supply and Dropout (BOOST and
SW pins).................................................................. 14
Start-Up and Shutdown (RUN, TRACK/SS,
OVLO Pins).............................................................. 14
Light Load Operation: Burst Mode Operation,
Pulse Skipping or Forced Continuous
Mode (MODE Pin).................................................... 14
Frequency Selection, Spread Spectrum,
and Phase-Locked Loop (FREQ and
PLLIN/SPREAD Pins)............................................... 16
Applications Information................................. 17
Current Sense Selection.......................................... 17
Low Value Resistor Current Sensing........................ 17
Inductor DCR Sensing............................................. 17
Setting the Operating Frequency............................. 19
Selecting the Light-Load Operating Mode................ 19
Inductor Value Calculation.......................................20
Inductor Core Selection........................................... 21
Power MOSFET Selection........................................ 21
CIN and COUT Selection............................................22
Setting the Output Voltage.......................................22
RUN Pins and Overvoltage/Undervoltage
Lockout.................................................................... 23
Tracking and Soft-Start (TRACK/SS1,
TRACK/SS2 Pins).................................................... 24
Single Output Two-Phase Operation........................25
DRVCC Regulators....................................................25
Topside MOSFET Driver Supply (CB, DB)................. 27
Burst Clamp Programming...................................... 28
Fault Conditions: Current Limit and
Current Foldback......................................................29
Fault Conditions: Overvoltage
Protection (Crowbar)...............................................29
Fault Conditions: Overtemperature Protection.........29
Phase-Locked Loop and Frequency
Synchronization....................................................... 29
Minimum On-Time Considerations..........................30
Efficiency Considerations........................................30
Checking Transient Response.................................. 31
Design Example....................................................... 32
PC Board Layout Checklist......................................33
PC Board Layout Debugging....................................35
Typical Applications....................................... 36
Package Description...................................... 40
Revision History........................................... 41
Typical Application........................................ 42
Related Parts............................................... 42
Rev. A
2 For more information www.analog.com


Part Number LTC7810
Description 2-Phase Synchronous Step-Down DC/DC Controller
Maker Analog Devices
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LTC7810 Datasheet PDF






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