NB621EV-LF-P Datasheet, PDF (1/14 Pages) MPS Industries, Inc. – 8A, 25V, 600kHz Synchronous Step-Down Converter with Integrated LDO

The Future of Analog IC Technology
NB621
8A, 25V, 600kHz Synchronous Step-Down
Converter with Integrated LDO
DESCRIPTION
The NB621 is a high frequency synchronous
rectified step-down switch mode converter with
a built in internal high side power MOSFET and
integrated LDO. It offers a very compact
solution to achieve 8A continuous output
current over a wide input, load and line range.
Current mode operation provides fast transient
response and eases loop stabilization.
Full protection features include OCP and thermal
shut down.
The NB621 requires a minimum number of
readily available standard external components
and is available in a space saving 4mm x 5mm
28-pin QFN package.
FEATURES
• Wide 5.5V to 25V Operating Input Range
• 8A Output Current
• Internal Low R_DSON Power MOSFETs
• Fixed 600kHz switching frequency
• Sync from 300kHz to 2MHz External Clock
• Integrated 100mA LDO
• Internal Compensation
• Power Good Output
• Integrated Bootstrap Diode
• OCP Protection and Thermal Shutdown
• Output Adjustable from 0.8V to 15V
• Available in 4mm x 5mm 28-pin QFN 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
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION (FOR NOTEBOOK)
VCC
GND
VCC
AAM
PGOOD
EN
VIN
VCC
R3
100k
R2
R1
100k 100k
R4
60.4k
R5
20k
ENLDO
U1
NB621EV
17,18,19,20,21
IN
1 ^R14
BST
10k
11
VCC
2,3,4,5
SW
FB ¹⁴
12
AAM
SDRV ⁸
15 _PGOOD
16 _EN/SYNC
23 _ENLDO
SS
REGO ²⁶
25
LDO
6,9,24,27,28
NC
GND SELH
VIN
R8
100k
R9
22k
Q1
FDS6670AS
R11
61.9k
R13
1k
R12
20.0k
3.3V
VOUT
GND
NB621 Rev. 0.9
www.MonolithicPower.com
1
12/10/2013
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