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LTC3720 Datasheet

  • LTC3720

  • Single Phase VRM8.5 Current Mode Step-Down Controller

  • 294.16KB

  • 24頁(yè)

  • LINER

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LTC3720
Single Phase VRM8.5
Current Mode Step-Down Controller
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
5-Bit Programmable Output Voltage:
1.05V to 1.825V (VRM8.5)
No Sense Resistor Required
2% to 87% Duty Cycle at 200kHz
t
ON(MIN)
鈮?/div>
100ns
Supports Active Voltage Positioning
True Current Mode Control
Stable with Ceramic C
OUT
Dual N-Channel MOSFET Synchronous Drive
Power Good Output Voltage Monitor
Wide V
IN
Range: 4V to 36V
鹵1%
0.8V Reference
Adjustable Current Limit
Adjustable Switching Frequency
Forced Continuous Control Pin
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Micropower Shutdown: I
Q
< 30碌A(chǔ)
Available in 28-Lead Narrow SSOP Package
The LTC
廬
3720 is a synchronous step-down switching
regulator controller for CPU power. An output voltage
between 1.05V and 1.825V is selected by a 5-bit code
(Intel VRM8.5 VID specification). The controller uses a
valley current control architecture to deliver very low duty
cycles without requiring a sense resistor. Operating fre-
quency is selected by an external resistor and is compen-
sated for variations in V
IN
and V
OUT
.
Discontinuous mode operation provides high efficiency
operation at light loads. A forced continuous control pin
reduces noise and RF interference and can assist second-
ary winding regulation by disabling discontinuous mode
operation when the main output is lightly loaded.
Fault protection is provided by internal foldback current
limiting, an output overvoltage comparator and optional
short-circuit shutdown timer. Soft-start capability for sup-
ply sequencing is accomplished using an external timing
capacitor. The regulator current limit level is also user
programmable. Wide supply range allows operation from
4V to 36V at the input.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R
SENSE
is a trademark of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
APPLICATIO S
s
s
Power Supplies for Pentium
廬
Processors
Notebook Computers and Servers
TYPICAL APPLICATIO
LTC3720
PGOOD
I
ON
0.1碌F
RUN/SS
470pF
20k
SGND
BOOST
V
CC
INTV
CC
VID4
VID3
5-BIT VID
VID2
VID1
VID0
SENSE
+
BG
PGND
SENSE爐
V
OSENSE
I
TH
V
IN
TG
SW
330k
IRF7811W
脳2
0.33碌F
CMDSH-3
L1
1碌H
10碌F
脳5
V
IN
5V TO 24V
+
UPS840
+
C
OUT
270碌F
2V
脳4
EFFICIENCY (%)
V
OUT
1.05V TO 1.825V
20A
4.7碌F
IRF7811W
脳3
C
OUT
: CORNELL DUBILIER
ESRE271M02B
L1: SUMIDA CEP125-IROMC
3720 F01a
Figure 1. High Efficiency Step-Down Converter
U
Efficiency vs Output Current
100
V
OUT
= 1.45V
95 L1 = 1碌H
90
85
80
75
70
65
60
55
0.01
1
10
0.1
OUTPUT CURRENT (A)
100
3720 F01b
U
U
V
IN
= 5V
V
IN
= 15V
3720f
1

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