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NB6381 데이터시트 PDF




MPS에서 제조한 전자 부품 NB6381은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 NB6381 기능
기능 High Efficiency Fast Transient 7A 28V Synchronous Step-down Converter
제조업체 MPS
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NB6381 데이터시트, 핀배열, 회로
Sy
The Future of Analog IC Technology
NB6381
High Efficiency, Fast Transient, 8A, 28V
nchronous Step-down Converter
in a Tiny QFN20 (3x4mm) Package
DESCRIPTION
The NB63 81 is a fully integrated, high
frequency synchronous rectified step-down
switch mode converter. It offers a very compact
solution to achieve 8A continu ous output
current over a wide input supply range with
excellent load and line regulation. The NB6381
operates at high e fficiency over a wide output
current load range.
Constant-On-Time (COT) co
ntrol mod e
provides fast transient response and eases loop
stabilization.
Full protection features include SCP, OCP, OVP,
UVP and thermal shutdown.
The NB 6381 re quires a min imum numbe r of
readily available sta ndard ext ernal components
and is ava ilable in a spa ce-saving QFN2 0
(3x4mm) package.
FEATURES
Wide 4.5V to 28V Operating Input Range
8A Output Current
Internal 30m High-Si de, 12m L ow-Side
Power MOSFETs
Proprietary Switching Loss Reduction
Technique
1% Reference Voltage
Programmable Soft Start Time
Soft Shutdown
200kHz to 1MHz Switching Frequency
SCP, OCP , OVP, UVP Protection and
Thermal Shutdown
Output Adjustable from 0.8V to 13V
Available in a QFN20 (3x4mm) Package
APPLICATIONS
Notebook Systems and I/O Power
Networking Systems
Optical Communication Systems
Distributed Power and POL 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
R7
8,19 IN
BST 7
NB6381 SW
2 FREQ
9,10,17,18
20 VCC
PGOOD
EN
5 EN
FB 3
C4
220pF
VOUT 1.05V
SS AGND PGND
41
CSS
33nF
11-16
NB6381 Rev. 1.15
www.MonolithicPower.com
4/18/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
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NB6381 pdf, 반도체, 판매, 대치품
NB6381–HIGH EFFICIENCY, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin #
1 AGND
Name
2 FREQ
3 FB
4 SS
5 EN
6
PGOOD
7 BST
8, 19
IN
9, 10, 17, 18
SW
11-16 PGND
20 VCC
Description
Analog Ground.
Frequency Set during CCM operation. The ON period is determined by the input
voltage and the frequency-set resistor connected to FREQ pin. Connect a resistor
to IN for line feed-forward. Decouple with a 1nF capacitor.
Feedback. An external resistor divider from the output to GND, tapped to the FB
pin, sets the output voltage.
Soft Start. Conne ct an external SS capa citor to prog ram the soft start time for the
switch mode regulator. When the EN pin beco mes high, an internal current source
(8.5uA) charges up the SS capacitor and the SS voltage slowly ramps up from 0 to
VFB smoothly. When the EN pin becomes low, an internal current source (8.5μA)
discharges the SS capacitor and the SS voltage slowly ramps down.
EN=1 to enable the NB6381. For automatic start-up, connect EN pin to IN with a
100kresistor. It includes an internal 1mpull-down resistor.
Power Goo d Output. The output of this pin i s an o pen d rain a nd is hig h if the
output voltage is higher than 90% of the nominal voltage. There is delay from FB
90% to PGOOD high, which is 50% of SS time plus 0.5ms.
Bootstrap. A 0.1µF-1µF capacitor connected between SW and BS pins is required
to form a floating supply across the high-side switch driver.
Supply Voltage. The NB6381 operates from a +4.5V to +28V input rail. CIN is
needed to decouple the input rail. Use wide PCB traces and multiple vias to make
the connection.
Switch Output. Use wide PCB traces and multiple vias to make the connection.
System Ground. This pin is the reference ground of the regulated output voltage.
For this reason care must be taken in PCB layout.
Internal Bias Supply. Decouple with a 1µF capacitor as close to the pin as
possible.
NB6381 Rev. 1.15
www.MonolithicPower.com
4/18/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
4

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NB6381 전자부품, 판매, 대치품
NB6381–HIGH EFFICIENCY, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=12V, VOUT =1.05V, L=1µH, TA=+25°C, unless otherwise noted.
Start-Up Through EN
IOUT=0A
Start-Up Through EN
IOUT=8A
Shutdown Through EN
IOUT=0A
VOUT
500mV/div
SW
10V/div
EN
10V/div
IL
2A/div
1ms/div
VOUT
500mV/div
SW
10V/div
EN
10V/div
IL
5A/div
1ms/div
VOUT
500mV/div
SW
10V/div
EN
10V/div
IL
2A/div
Shutdown Through EN
IOUT=8A
Short-Circuit Protection
VOUT
500mV/div
SW
10V/div
EN
10V/div
IL
5A/div
1ms/div
VOUT/AC
500mV/div
SW
10V/div
IL
5A/div
VOUT
50mV/div.
VSW
10V/div.
IL
5A/div.
1ms/div
NB6381 Rev. 1.15
www.MonolithicPower.com
4/18/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
7

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