ltc3770 Linear Technology Corporation, ltc3770 Datasheet
ltc3770
Manufacturer Part Number
ltc3770
Description
Fast No Rsense Step-down Synchronous Controller With Margining, Tracking And Pll
Manufacturer
Linear Technology Corporation
Datasheet
1.LTC3770.pdf
(24 pages)
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Part Number:
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Quantity:
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FEATURES
TYPICAL APPLICATIO
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APPLICATIO S
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Wide V
±0.67% 0.6V Reference Voltage
Output Voltage Tracking Capability
Programmable Margining
Sense Resistor Optional
True Current Mode Control
2% to 90% Duty Cycle at 200kHz
t
Phase Lock Loop Frequency Synchronization
Powerful Dual N-Channel MOSFET Driver
Adjustable Cycle-by-Cycle Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Current Foldback Protection (Disabled at Start-Up)
Output Overvoltage Protection
Micropower Shutdown: I
Power Good Output Voltage Monitor
Tracks the Reference Input Pin
Available in (5mm × 5mm) QFN and 28-Lead
SSOP Packages
Distributed Power Systems
Server Power Supply
ON(MIN)
1000pF
0.01µF
0.1µF
V
OUT
10k
82k
10k
10k
IN
≤ 100ns
Range: 4V to 32V
PGOOD
MARGIN
PLLFLTR
PLLIN
TRACK/SS
I
SGND
RUN
V
V
V
V
MPGM
TH
ON
RNG
REFOUT
REFIN
LTC3770
High Efficiency Step-Down Converter
SENSE
SENSE
INTV
BOOST
DRV
PGND
U
SW
V
I
V
BG
TG
ON
CC
CC
IN
FB
+
–
68k
0.22µF
CMDSH-3
4.7µF
Q
< 30µA
U
Si4884
Si4874
1.8µH
3770 TA01
B340A
95.3k
30.1k
+
10µF
35V
x3
180µF
4V
x2
V
5V TO 28V
V
2.5V
10A
IN
OUT
DESCRIPTIO
The LTC
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 fre-
quency is selected by an external resistor and is compen-
sated for variations in input supply voltage. An internal
phase-lock 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 volt-
ages 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.
R
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178, 5487554, 6580258, 6304066, 6476589,
6774611.
SENSE
Margining, Tracking and PLL
Synchronous Controller with
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Fast No R
is a registered trademark of Linear Technology Corporation.
®
3770 is a synchronous step-down switching
Efficiency and Power Loss vs Load Current
100
95
90
85
80
75
70
65
60
55
50
0.01
U
V
V
IN
OUT
SENSE
= 5V
= 2.5V
LOAD CURRENT (A)
POWER LOSS
0.1
EFFICIENCY
TM
Step-Down
1
3770 TA01b
LTC3770
10
10
1
0.1
0.01
3770fb
1
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