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LTC3720EGN#TR

Description
IC stp-DN cntrlr sngl-phs 28ssop
CategoryPower/power management    The power supply circuit   
File Size289KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC3720EGN#TR Overview

IC stp-DN cntrlr sngl-phs 28ssop

LTC3720EGN#TR Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP,
Contacts28
Manufacturer packaging codeGN
Reach Compliance Codecompli
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Maximum input voltage36 V
Minimum input voltage4 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G28
JESD-609 codee0
length9.9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current2 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationPUSH-PULL
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3.9116 mm
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)
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
±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
< 30µA
Available in 28-Lead Narrow SSOP Package
The LTC
®
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
®
Processors
Notebook Computers and Servers
TYPICAL APPLICATIO
LTC3720
PGOOD
I
ON
0.1µF
RUN/SS
470pF
20k
SGND
BOOST
V
CC
INTV
CC
VID4
VID3
5-BIT VID
VID2
VID1
VID0
SENSE
+
BG
PGND
SENSE¯
V
OSENSE
I
TH
V
IN
TG
SW
330k
IRF7811W
×2
0.33µF
CMDSH-3
L1
1µH
10µF
×5
V
IN
5V TO 24V
+
UPS840
+
C
OUT
270µF
2V
×4
EFFICIENCY (%)
V
OUT
1.05V TO 1.825V
20A
4.7µF
IRF7811W
×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 = 1µH
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

LTC3720EGN#TR Related Products

LTC3720EGN#TR LTC3720EGN#TRPBF LTC3720EGN#PBF
Description IC stp-DN cntrlr sngl-phs 28ssop IC STP-DN CNTRLR SNGL-PHS 28SSOP IC STP-DN CNTRLR SNGL-PHS 28SSOP
Brand Name Linear Technology Linear Technology -
Is it Rohs certified? incompatible conform to -
Maker Linear ( ADI ) Linear ( ADI ) -
Parts packaging code SSOP SSOP -
package instruction SSOP, SSOP, -
Contacts 28 28 -
Manufacturer packaging code GN GN -
Reach Compliance Code compli compliant -
ECCN code EAR99 EAR99 -
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER -
control mode CURRENT-MODE CURRENT-MODE -
Maximum input voltage 36 V 36 V -
Minimum input voltage 4 V 4 V -
Nominal input voltage 15 V 15 V -
JESD-30 code R-PDSO-G28 R-PDSO-G28 -
JESD-609 code e0 e3 -
length 9.9 mm 9.9 mm -
Humidity sensitivity level 1 1 -
Number of functions 1 1 -
Number of terminals 28 28 -
Maximum operating temperature 70 °C 70 °C -
Maximum output current 2 A 2 A -
Package body material PLASTIC/EPOXY PLASTIC/EPOXY -
encapsulated code SSOP SSOP -
Package shape RECTANGULAR RECTANGULAR -
Package form SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH -
Peak Reflow Temperature (Celsius) 235 250 -
Certification status Not Qualified Not Qualified -
Maximum seat height 1.75 mm 1.75 mm -
surface mount YES YES -
Switch configuration PUSH-PULL PUSH-PULL -
Temperature level COMMERCIAL COMMERCIAL -
Terminal surface Tin/Lead (Sn/Pb) Matte Tin (Sn) -
Terminal form GULL WING GULL WING -
Terminal pitch 0.635 mm 0.635 mm -
Terminal location DUAL DUAL -
Maximum time at peak reflow temperature 20 NOT SPECIFIED -
width 3.9116 mm 3.9116 mm -
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