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Linear Technology Electronic Components Datasheet

LTC3770EG Datasheet

Step-Down Synchronous Controller

No Preview Available !

FEATURES
n Wide VIN Range: 4V to 32V
n ±0.67% 0.6V Reference Voltage
n Output Voltage Tracking Capability
n Programmable Margining
n Sense Resistor Optional
n True Current Mode Control
n 2% to 90% Duty Cycle at 200kHz
n tON(MIN) ≤ 100ns
n Phase-Locked Loop Frequency Synchronization
n Powerful Dual N-Channel MOSFET Driver
n Adjustable Cycle-by-Cycle Current Limit
n Adjustable Switching Frequency
n Programmable Soft-Start
n Current Foldback Protection (Disabled at Start-Up)
n Output Overvoltage Protection
n Micropower Shutdown: IQ < 30μA
n Power Good Output Voltage Monitor
Tracks the Reference Input Pin
n Available in (5mm × 5mm) QFN and 28-Lead
SSOP Packages
APPLICATIONS
n Distributed Power Systems
n Server Power Supply
LTC3770
Fast No RSENSETM Step-Down
Synchronous Controller with
Margining, Tracking and PLL
DESCRIPTION
The LTC®3770 is a synchronous step-down switching
regulator controller with output voltage up/down tracking
capability and voltage margining. Its advanced functions
and high accuracy reference are ideal for powering
high performance server, ASIC and computer memory
systems.
The LTC3770 uses a constant on-time, valley current
mode control architecture to deliver very low duty factors
without requiring a sense resistor. The operating frequency
is selected by an external resistor and is compensated for
variations in input supply voltage. An internal phase-locked
loop allows the IC to be synchronized to an external
clock.
Fault protection is provided by an overvoltage comparator
and input undervoltage lockout. The regulator current
limit is user programmable. A wide supply range allows
voltages as high as 32V to be stepped down to as low as
a 0.6V output. Power supply sequencing is accomplished
using an external soft-start timing capacitor.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
RSENSE is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178, 5487554, 6580258, 6304066, 6476589,
6774611.
TYPICAL APPLICATION
High Efficiency Step-Down Converter
0.01μF
10k
0.1μF
1000pF 10k
VOUT
10k
82k
PGOOD ION
MARGIN VIN
PLLFLTR TG
PLLIN
SW
TRACK/SS
ITH
BOOST
LTC3770
SGND
RUN
VON
VRNG
INTVCC
DRVCC
BG
SENSE+
VREFOUTSENSE
VREFIN
MPGM
PGND
VFB
68k
0.22μF
Si4884
1.8μH
CMDSH-3
VIN
10μF 5V TO 28V
35V
x3
VOUT
2.5V
+
10A
180μF
4V
x2
Si4874
B340A
4.7μF
95.3k
30.1k
3770 TA01
Efficiency and Power Loss vs Load Current
100
VIN = 5V
95 VOUT = 2.5V
90
EFFICIENCY
85
80
75
70
POWER LOSS
65
60
55
50
0.01
0.1
1
LOAD CURRENT (A)
10
1
0.1
0.01
10
3770 TA01b
3770fc
1


Linear Technology Electronic Components Datasheet

LTC3770EG Datasheet

Step-Down Synchronous Controller

No Preview Available !

LTC3770
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN, VINSNS) ............ 32V to –0.3V
Boosted Topside Driver Supply Voltage
BOOST ................................................... 38V to –0.3V
SENSE+, SW Voltage..................................... 32V to –5V
DRVCC, (BOOST – SW) Voltages.................. 7V to –0.3V
VON, VRNG, PGOOD Voltages .....INTVCC + 0.3V to – 0.3V
PLLFLTR, ITH, VFB, VREFIN Voltages .......... 2.7V to –0.3V
TRACK/SS, FCB, Z0, Z1, Z2, RUN, PLLIN, MARGIN0,
MARGIN1 Voltages ....................INTVCC + 0.3V to – 0.3V
INTVCC, ZVIN Voltages.................................. 7V to –0.3V
TG, BG, INTVCC Peak Currents ....................................4A
TG, BG, INTVCC RMS Currents...............................50mA
Operating Ambient Temperature
Range (Note 4).........................................–40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range...................–65°C to 125°C
QFN Reflow Peak Body Temperature..................... 245°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
RUN 1
VON 2
PGOOD 3
VRNG 4
VFB 5
ITH 6
SGND 7
MARGIN1 8
MARGIN0 9
ION 10
VREFIN 11
VREFOUT 12
MPGM 13
TRACK/SS 14
TOP VIEW
28 FCB
27 Z0
26 BOOST
25 TG
24 SW
23 PGND
22 BG
21 INTVCC
20 Z2
19 Z1
18 ZVIN
17 VIN
16 PLLIN
15 PLLFLTR
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 130°C/W
TOP VIEW
VRNG 1
VFB 2
32 31 30 29 28 27 26 25
24
23
SENSE+
SENSE
ITH 3
22 PGND
SGND 4
MARGIN1 5
21 BG
33
20 DRVCC
MARGIN0 6
19 INTVCC
ION 7
VREFIN 8
18 Z2
17 Z1
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm s 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD IS SGND (PIN 33)
MUST BE SOLDERED TO THE PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3770EG#PBF
LTC3770EG#TRPBF
LTC3770EG
28-Lead Plastic SSOP
LTC3770EUH#PBF
LTC3770EUH#TRPBF 3770
32-Lead (5mm × 5mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard 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/
2
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
3770fc


Part Number LTC3770EG
Description Step-Down Synchronous Controller
Maker Linear
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LTC3770EG Datasheet PDF






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