ltc3711 Linear Technology Corporation, ltc3711 Datasheet
ltc3711
Manufacturer Part Number
ltc3711
Description
5-bit Adjustable, Wide Operating Range, No Rsense? Step-down Controller
Manufacturer
Linear Technology Corporation
Datasheet
1.LTC3711.pdf
(24 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ltc3711EGN
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
ltc3711EGN#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
Power Supplies for Mobile Pentium
Notebook and Palmtop Computers, PDAs
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
Supports Active Voltage Positioning
Extremely Fast Transient Response
Stable with Ceramic C
Dual N-Channel MOSFET Synchronous Drive
Power Good Output Voltage Monitor
Wide V
Adjustable Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Micropower Shutdown: I
Available in 24-Lead Narrow SSOP Package
ON(MIN)
1% 0.8V Reference
C
5-BIT VID
C
500pF
R
IN
0.1 F
C
C
< 100ns
20k
SS
Range: 4V to 36V
Figure 1. High Efficiency Step-Down Converter
PGOOD
RUN/SS
I
SGND
VID4
VID3
VID2
VID1
VID0
TH
LTC3711
U
V
BOOST
INTV
OSENSE
PGND
SW
I
V
BG
TG
ON
CC
IN
OUT
+
Q
C
330k
R
B
< 30 A
ON
0.33 F
D
CMDSH-3
C
4.7 F
B
VCC
U
M1
IRF7811A
M2
IRF7811A
®
2
Processors
1 H
L1
D1
UPS840
3711 F01a
C
+
No R
OUT
C
L1: SUMIDA CEP125-IROMC
IN
: UNITED CHEMICON
: CORNELL DUBILIER
C
22 F
50V
C
270 F
2V
THCR70EIH226ZT
ESRE271M02B
IN
3
OUT
4
DESCRIPTIO
The LTC
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
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.
No R
Pentium is a registered trademark of Intel Corporation.
V
5V TO 24V
V
1.5V
15A
SENSE
IN
OUT
, LTC and LT are registered trademarks of Linear Technology Corporation.
SENSE
is a trademark of Linear Technology Corporation.
®
Wide Operating Range,
3711 is a synchronous step-down switching
TM
Step-Down Controller
U
100
70
60
90
80
0.01
IN
V
EXTV
5-Bit Adjustable,
OUT
Efficiency vs Load Current
and V
CC
= 1.5V
= 5V
0.1
LOAD CURRENT (A)
OUT
.
V
V
IN
IN
= 15V
= 5V
1
LTC3711
3711 F01b
10
1
3711f
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