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PDF MP8760 Data sheet ( Hoja de datos )
| Número de pieza | MP8760 | |
| Descripción | Step-Down Converter | |
| Fabricantes | MPS | |
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The Future of Analog IC Technology
MP8760
High Efficiency, 6A, 18V,
Synchronous, Step-Down Converter
DESCRIPTION
The MP8760 is a fully-integrated, high-
frequency, synchronous, rectified, step-down,
switch-mode converter. It offers a very compact
solution to achieve a 6A output current over a
wide input-supply range with excellent load and
line regulation. The MP8760 operates at high
efficiency over a wide output-current load range.
The MP8760 uses Constant-On-Time (COT)
control mode to provide fast transient response
and ease loop stabilization.
An external resistor programs the operating
frequency from 200kHz to 1MHz. The
frequency stays nearly constant as the input
supply varies with the feed-forward
compensation.
The default under voltage lockout threshold is
4.1V, but a resistor network on the enable pin
can increase this threshold. The soft start pin
controls the output voltage startup ramp. An
open drain power good signal indicates that the
output is within nominal voltage range.
It has full integrated protection features that
include over-current protection, over-voltage
protection and thermal shutdown.
The MP8760 is available in a 3mm×4mm QFN
package, and requires a minimal number of
readily-available components.
TYPICAL APPLICATION
FEATURES
• 2.5V to 5V Operating Input Range with
External 5V Bias
• 4.5V to 18V Operating Input Range with
Internal Bias
• 6A Output Current
• Low RDS(ON) Internal Power MOSFETs
• Proprietary Switching-Loss-Reduction
Technique
• Adaptive COT for Ultrafast Transient
Response
• 1.5% Reference Voltage Over Junction
Temperature Range (−40°C to +125°C)
• Programmable Soft-Start Time
• Pre-Bias Start-Up
• Programmable Switching Frequency from
200kHz to 1MHz
• Non-Latch OCP, OVP, and Thermal
Shutdown
• Output Adjustable from 0.611V to 13V
APPLICATIONS
• Set-Top Boxes
• XDSL Modem/DSLAM
• Small-Cell Base Stations
• Personal Video Recorders
• Flat-Panel Televisions 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.
VIN
ON/OFF
C1 RFREQ
C5 R3
IN BST
FREQ
SW
EN MP8760
VCC
FB
PG
PGND
SS
AGND
C3 L1
R4 C4
C6
VOUT
R1 C2
R2
100
90
80
70
60
50
40
30
0.01
0.1
1
10
MP8760 Rev. 1.1
11/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
1 page  
MP8760 — 6A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
PIN #
PIN#
13-Pin QFN 16-Pin QFN
11
22
33
44
Name
EN
FREQ
FB
SS
Description
Enable. Digital input to turn the regulator ON or OFF. Drive EN HIGH to
turn on the regulator. Drive it LOW to turn it off. Connect EN to IN through
a pull-up resistor or a resistive voltage divider for automatic startup. Do
not float this pin.
Frequency Set. Requires a resistor connected between FREQ and IN to
set the switching frequency. The input voltage and the resistor connected
to the FREQ pin determine the ON time. The connection to the IN pin
provides line feed-forward and stabilizes the frequency during input
voltage jitter.
Feedback. Connect to the tab of an external resistor divider from the
output to GND to set the output voltage. FB is also configured to realize
over-voltage protection (OVP) by monitoring output voltage. Place the
resistor divider as close to FB pin as possible. Avoid using vias on the FB
traces.
Soft-Start. Connect an external capacitor to program the soft start time for
the switch mode regulator.
5 5 AGND Analog ground. The control circuit reference.
6
7
8
9,10
11, 12
13
6
7
8
15, 16
10, 11,
12 ,13
9,14
PG
VCC
BST
SW
PGND
IN
Power Good, the output is an open drain signal. Require a pull-up resistor
to a DC voltage to indicate high if the output voltage exceeds 91% of the
nominal voltage. There is a delay from FB ≥ 91% to PG goes high.
Internal 4.8V LDO output. Power the driver and control circuits. 5V
external bias can disable the internal LDO. Decoupling with ≥1µF ceramic
capacitor as close to the pin as possible. Use X7R or X5R dielectric
ceramic capacitors for their stable temperature characteristics.
Bootstrap. Require a capacitor connected between SW and BS pins to
form a floating supply across the high-side switch driver.
Switch Output. Connect to the inductor and bootstrap capacitor. The high-
side switch drives the pin up to the VIN voltage during PWM duty cycle’s
ON time. The inductor current drives the SW pin negative during the
OFF-time. The low-side switch’s ON-resistance and the internal Schottky
diode clamp the negative voltage. Connect using wide PCB traces
System Ground. Reference ground of the regulated output voltage. PCB
layout requires extra care. Connect using wide PCB traces.
Supply Voltage. Supplies power to the internal MOSFET and regulator.
The MP8760 operates from a +2.5V to +5V input rail with 5V external
bias and a +4.5V to +18V input rail with internal bias. Requires an input
decoupling capacitor. Connect using wide PCB traces and multiple vias.
MP8760 Rev. 1.1
11/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
5 Page 
BLOCK DIAGRAM
MP8760 — 6A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER
0.3V
0.75V
0. 6V
Figure 1: Functional Block Diagram
MP8760 Rev. 1.1
11/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MP8760.PDF ] | |
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