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부품번호 | NB675 기능 |
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기능 | 24V High Current Synchronous Buck Converter | ||
제조업체 | MPS | ||
로고 | |||
전체 21 페이지수
The Future of Analog IC Technology
NB675
24V, High Current
Synchronous Buck Converter
With +/-1.5A LDO and Buffed Reference
DESCRIPTION
The NB675 provides a complete power supply
for DDR3, DDR3L and LPDD R2 memory with
the highest power density. It integrates a high
frequency synchronous rectified step-down
switch mod e converter (VDDQ) with an 1.5A
sink/source LDO (VTT) and buffere d low noise
reference (VTTREF).
The fully integrated Buck converter is able to
deliver 10A continuous output current and 12A
peak output current over a wide input supply
range with excellent lo ad and line regulation.
The Buck converter employs the Constant-On-
Time (COT ) control scheme, which provides
fast transient respon se and eases loop
stabilization.
The VTT LDO provi des 1.5A sink/source
current ca pability an d requires only 10u F
ceramic capacitance.
The VTTREF tracks VDDQ/2 with an excellent
1% accuracy.
Under voltage lockout is internally set as 4.5V.
An open drain power good sign al indicate s
VDDQ is within its nominal voltage range.
Full p rotection f eatures include OCP, OVP, a nd
thermal shut down.
This p art r equires min imum numb er of ex ternal
components an d is a vailable in QFN21
(3mmx4mm) package.
FEATURES
• Wide 5V to 24V Operating Input Range
• 10A Continuous Output Current
• 12A Peak Output Current
• Built-in +/- 1.5A VTTLDO
• Low RDS(ON) Internal Power MOSFETs
• Proprietary Switching Loss Reduction
Technique
• Internal Soft Start
• Output Discharge
• 500kHZ Switching Frequency
• OCP, OVP, UVP Protection and Thermal
Shutdown
• VDDQ Adjustable from 0.604V to 5.5V
APPLICATIONS
• Laptop Computer
• Tablet PC
• Networking Systems
• Server
• Personal Video Recorders
• Flat Panel Television and Monitors
• Distributed Power Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
5-21V
VIN
BST
SW
EN 1
EN 2
PG
VCC
NB675
FB
VDDQSEN
VINLDO
AGND
VTT
PGND VTTREF VTTSEN
220nF
220nF
VDDQ
1.35V/10A
VTT
0.675V/2A
95
85
75
65
55
45
35
25
15
0.001
0.01 0.1
1
LOAD CURRENT (A)
10
NB675 Rev. 1.0
1/14/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
NB675 –24V, HIGH CURRENT SYNCHRONOUS BUCK CONVERTER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TJ = 25°C, unless otherwise noted.
Parameters
Symbol Condition
VCC Regulator
VCC Regulator
VCC Load Regulation
VCC
Icc=8mA
Power Good
FB Rising (Good)
FB Falling (Fault)
FB Rising (Fault)
FB Falling (Good)
Power Good Low to High Delay
Power Good Sink Current
Capability
Power Good Leakage Current
VTTREF Output
VTTREF Output Voltage
Output Voltage tolerance to
VDDQ
Current Limit
VTT LDO
VTT Output Voltage
VTT tolerance to VTTREF
Source Current Limit
Sink Current Limit
Thermal Protection
Thermal Shutdown(6)
Thermal Shutdown Hysteresis
Note:
6) Guaranteed by design.
PGVth-Hi
PGVth-Lo
PGVth-Hi
PGVth-Lo
PGTd
VPG Sink
4mA
IPG_LEAK
VPG = 3.3V
VTTREF
ILIMIT_VTTREF
IVTTREF<0.1mA,
1V<VDDQ<1.4V
IVTTREF<10mA,
1V<VDDQ<1.4V
10
VTT
ILIMIT_SOUCE
ILIMIT_SINK
-10mA<IVTT<10mA,
1V<VDDQ<1.4V
-1A<IVTT<1A,
1V<VDDQ<1.4V
TSD
Min Typ
4.8 5.1
5
95
85
115
105
450
VDDQSEN/2
48.2% 50% 51.8%
48% 50%
15
VTTREF
-20
-45
1.8
1.6
150
25
Max
5.3
0.4
1
52%
20
45
Units
V
%
%VREF
μs
V
μA
mA
mV
mV
A
A
°C
°C
NB675 Rev. 1.0
1/14/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
4
4페이지 NB675 –24V, HIGH CURRENT SYNCHRONOUS BUCK CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN =20V, VDDQ =1.35V, L=1.2µH, TJ=+25°C, unless otherwise noted.
Output Voltage Ripple
IOUT = 0A
Output Voltage Ripple
IOUT = 10A
Power Good through
EN Start-Up
IOUT = 0A
VDDQ
50mV/div.
VSW
10V/div.
VDDQ
50mV/div.
VSW
10V/div.
VDDQ
500mV/div.
VEN2
5V/div.
VPG
5V/div.
IL
1A/div.
IL
10A/div.
IL
1A/div.
Power Good through
EN Start-Up
IOUT = 10A
Start-Up through VIN
IOUT = 0A
Start-Up through VIN
IOUT = 10A
VDDQ
500mV/div.
VEN2
5V/div.
VPG
5V/div.
IL
10A/div.
VDDQ
500mV/div.
VIN
10V/div.
VSW
10V/div.
IL
5A/div.
VDDQ
500mV/div.
VIN
10V/div.
VSW
10V/div.
IL
10A/div.
Shutdown through VIN
IOUT = 0A
Shutdown through VIN
IOUT = 10A
Start-Up through EN
IOUT = 0A
VDDQ
1V/div.
VIN
10V/div.
VSW
2V/div.
IL
2A/div.
VDDQ
1V/div.
VIN
5V/div.
VSW
5V/div.
IL
5A/div.
VDDQ
1V/div.
VEN2
5V/div.
VSW
20V/div.
IL
2A/div.
NB675 Rev. 1.0
1/14/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
7
7페이지 | |||
구 성 | 총 21 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
NB670 | 24V High Current Synchronous Buck Converter | MPS |
NB671 | 24V High Current Synchronous Step-down Converter | MPS |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |