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LTC3711EGN

Description
5-Bit Adjustable, Wide Operating Range, No RSENSE
CategoryPower/power management    The power supply circuit   
File Size294KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC3711EGN Overview

5-Bit Adjustable, Wide Operating Range, No RSENSE

LTC3711EGN Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP,
Contacts24
Manufacturer packaging codeGN
Reach Compliance Code_compli
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage36 V
Minimum input voltage4 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G24
JESD-609 codee0
length8.65 mm
Humidity sensitivity level1
Number of functions1
Number of terminals24
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
Maximum switching frequency590 kHz
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
LTC3711
5-Bit Adjustable,
Wide Operating Range,
No R
SENSE
TM
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: 0.925V to 2V
No Sense Resistor Required
True Current Mode Control
2% to 90% Duty Cycle at 200kHz
t
ON(MIN)
< 100ns
Supports Active Voltage Positioning
Extremely Fast Transient Response
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
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Micropower Shutdown: I
Q
< 30µA
Available in 24-Lead Narrow SSOP Package
The LTC
®
3711 is a synchronous step-down switching
regulator controller for CPU power. An output voltage
between 0.925V and 2.000V is selected by a 5-bit code
(Intel mobile 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 user pro-
grammable. 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 Mobile Pentium
®
Processors
Notebook and Palmtop Computers, PDAs
TYPICAL APPLICATIO
R
ON
330k
PGOOD
C
SS
0.1µF
RUN/SS
C
C
500pF
R
C
20k
I
TH
SGND
I
ON
V
IN
TG
SW
BOOST
INTV
CC
VID4
VID3
5-BIT VID
VID2
VID1
VID0
V
OSENSE
PGND
BG
C
B
0.33µF
M1
IRF7811A
L1
1µH
EFFICIENCY (%)
C
IN
22µF
50V
×3
V
IN
5V TO 24V
LTC3711
D
B
CMDSH-3
M2
IRF7811A
×2
D1
UPS840
+
C
OUT
270µF
2V
×4
V
OUT
1.5V
15A
+
C
VCC
4.7µF
C
IN
: UNITED CHEMICON
THCR70EIH226ZT
C
OUT
: CORNELL DUBILIER
ESRE271M02B
L1: SUMIDA CEP125-IROMC
3711 F01a
Figure 1. High Efficiency Step-Down Converter
U
Efficiency vs Load Current
100
V
OUT
= 1.5V
EXTV
CC
= 5V
90
V
IN
= 15V
80
V
IN
= 5V
70
60
0.01
1
0.1
LOAD CURRENT (A)
10
3711 F01b
U
U
3711f
1

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