參數(shù)資料
型號(hào)： LTC3720
廠商： Linear Technology Corporation
英文描述： Single Phase VRM8.5 Current Mode Step-Down Controller
中文描述： 單相VRM8.5電流模式降壓型控制器
文件頁數(shù)： 1/24頁
文件大小： 301K
代理商： LTC3720
1
LTC3720
3720f
Single Phase VRM8.5
Current Mode Step-Down Controller
I
5-Bit Programmable Output Voltage:
1.05V to 1.825V (VRM8.5)
I
No Sense Resistor Required
I
2% to 87% Duty Cycle at 200kHz
I
t
ON(MIN)
≤
100ns
I
Supports Active Voltage Positioning
I
True Current Mode Control
I
Stable with Ceramic C
OUT
I
Dual N-Channel MOSFET Synchronous Drive
I
Power Good Output Voltage Monitor
I
Wide V
IN
Range: 4V to 36V
I
±
1% 0.8V Reference
I
Adjustable Current Limit
I
Adjustable Switching Frequency
I
Forced Continuous Control Pin
I
Programmable Soft-Start
I
Output Overvoltage Protection
I
Optional Short-Circuit Shutdown Timer
I
Micropower Shutdown: I
Q
< 30
μ
A
I
Available in 28-Lead Narrow SSOP Package
APPLICATIU
I
Power Supplies for Pentium
Processors
I
Notebook Computers and Servers
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
is a trademark of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
CMDSH-3
UPS840
C
OUT
: CORNELL DUBILIER
ESRE271M02B
L1: SUMIDA CEP125-IROMC
L1
1
μ
H
4.7
μ
F
10
μ
F
×
5
V
5V TO 24V
V
1.05V TO 1.825V
20A
+
C
OUT
270
μ
F
2V
×
4
IRF7811W
×
3
3720 F01a
IRF7811W
×
2
330k
0.1
μ
F
I
ON
PGOOD
V
IN
TG
SW
BOOST
V
CC
RUN/SS
I
TH
SGND
INTV
CC
SENSE
+
BG
PGND
SENSEˉ
5-BIT VID
V
OSENSE
VID0
VID1
VID2
VID3
VID4
0.33
μ
F
20k
LTC3720
470pF
+
Figure 1. High Efficiency Step-Down Converter
OUTPUT CURRENT (A)
0.01
E
100
3720 F01b
0.1
1
10
100
95
90
85
80
75
70
65
60
55
V
IN
= 5V
V
IN
= 15V
V
= 1.45V
L1 = 1
μ
H
Efficiency vs Output Current
DESCRIPTIOU
FEATURES
TYPICAL APPLICATIO
U
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LTC3720EGN#TR 功能描述:IC STP-DN CNTRLR SNGL-PHS 28SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
LTC3720EGN#TRPBF 功能描述:IC STP-DN CNTRLR SNGL-PHS 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
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