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NB634 데이터시트 PDF




MPS에서 제조한 전자 부품 NB634은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 NB634 기능
기능 Synchronous Step-down Converter
제조업체 MPS
로고 MPS 로고


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NB634 데이터시트, 핀배열, 회로
The Future of Analog IC Technology
DESCRIPTION
The NB634 is a high efficiency synchronous
rectified step-down switch mode converter with
built-in internal power MOSFETs. It offers a
very compact solution to achieve 5A continuous
output current over a wide input supply range
with excellent load and line regulation. The
NB634 operates at high efficiency over a wide
output current load range.
Current mode operation provides fast transient
response and eases loop stabilization.
Full protection features include latch-off OCP and
thermal shut down.
The NB634 requires a minimum number of
readily available standard external components
and is available in a space saving QFN14 (3mm x
4mm) package.
NB634
High Efficiency 5A, 24V, 500kHz
Synchronous Step-down Converter
FEATURES
Wide 4.5V to 24V Operating Input Range
5A Output Current
Low RDS(ON) Internal Power MOSFETs
Proprietary Switching Loss Reduction
Technique
Fixed 500kHz Switching Frequency
Sync from 300kHz to 2MHz External Clock
Internal Compensation
Latch-off OCP Protection and Thermal
Shutdown
Output Adjustable from 0.8V
Available in a QFN14 (3mmx4mm) Package
APPLICATIONS
Notebook Systems and I/O Power
Networking Systems
Digital Set Top Boxes
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 FOR NOTEBOOK
4.5V-24V
VIN
VCC
C1
22uF
R3
R4
ON/OFF
1 IN
3.3V
9
PG
10 AAM
11
C3
VCC
0.1uF
NB634
7 EN/SY NC
BST 6
SW 2,3,4,5
C4
0.1uF
L1
2.3uH
8
FB
Rt
24.9k
GND
12,13,14
R1
10k
R2
8.06k
C2
47uF
VOUT 1.8V
Efficiency
VOUT=1.8V, L=1.0uH
100
95 VIN=7V
90
VIN=12V
85
80 VIN=24V
75
70
65
60
55
50
012345
OUTPUT CURRENT (A)
6
NB634 Rev. 0.94
12/25/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1




NB634 pdf, 반도체, 판매, 대치품
NB634 –HIGH EFFICIENCY, 5A, 24V, 500kHz SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin #
1
2,3,4,5
6
7
8
9
10
11
14
12, 13
Name
Description
Supply Voltage. The NB634 operates from a +4.5V to +24V input rail. C1 is
IN needed to decouple the input rail. Use wide PCB traces and multiple vias to make
the connection.
SW Switch Output. Use wide PCB traces and multiple vias to make the connection.
BST
Bootstrap. A capacitor connected between SW and BST pins is required to form a
floating supply across the high-side switch driver.
EN/SYNC
EN=1 to enable the NB634. External clock can be applied to EN pin for changing
switching frequency. For automatic start-up, connect EN pin to VIN with 100k
resistor. It includes an internal 1Mpull-down resistor.
Feedback. An external resistor divider from the output to GND, tapped to the FB
FB
pin, sets the output voltage. To prevent current limit run away during a short circuit
fault condition, the frequency fold-back comparator lowers the oscillator frequency
when the FB voltage is below 100mV.
Power Good Output. The output of this pin is an open drain. When the FB voltage
PG
rises to 90% of the REF voltage, Power Good (PG) output goes high after a 250μs
delay. When the FB voltage drops to 70% of the REF voltage, PG goes low
immediately.
AAM
Connects to a voltage set by a resistor divider between VCC and GND to force the
NB634 into non-synchronous mode at light load.
VCC
Bias Supply. Decouple with 0.1µF capacitor.
AGND
Analog Ground. This pin is the reference ground of the regulated output voltage.
For this reason care must be taken in PCB layout.
GND,
Exposed PAD
System Ground. Connect these pins with larger copper areas to the negative
terminals of the input and output capacitors. Connect exposed pad to GND plane
for proper thermal performance.
NB634 Rev. 0.94
12/25/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
4

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NB634 전자부품, 판매, 대치품
NB634 –HIGH EFFICIENCY, 5A, 24V, 500kHz SYNCHRONOUS STEP-DOWN CONVERTER
BLOCK DIAGRAM
IN
VCC
PG
VCC
Regulator
250us
Delay
+
-
PG Comparator
EN/SYNC
1MEG
Reference
FB
AAM
Oscillator
1pF
50pF 400k
++-
Error Amplifier
+
-
Currrent Sense
Amplifer
Boost
Regulator
+
-
Current Limit
Comparator
Comparator
On Time Control
Logic Control
HS
Driver
VCC
LS
Driver
Figure 1—Functional Block Diagram
RSEN
BST
SW
GND
NB634 Rev. 0.94
12/25/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
7

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