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PDF MP8762 Data sheet ( Hoja de datos )
| Número de pieza | MP8762 | |
| Descripción | Synchronous Step-down Converter | |
| Fabricantes | MPS | |
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The Future of Analog IC Technology
MP8762
High Efficiency, 10A, 18V
Synchronous Step-down Converter
DESCRIPTION
The MP8762 is a fully integrated high frequency
synchronous rectified step-down switch mode
converter. It offers a very compact solution to
achieve 10A output current over a wide input
supply range with excellent load and line
regulation. The MP8762 operates at high
efficiency over a wide output current load range.
The MP8762 adopts Constant-On-Time (COT)
control mode that provides fast transient
response and eases loop stabilization.
Operation frequency can be programmed easily
from 200kHz to 1MHz by an external resistor
and keeps nearly constant as input supply
varies by the feedforward compensation.
Under voltage lockout is internally set at 4.1V,
but can be increased by programming the
threshold with a resistor network on the enable
pin. The output voltage startup ramp is
controlled by the soft start pin. An open drain
power good signal indicates the output is within
its nominal voltage range.
Full integrated protection features include OCP,
OVP and thermal shutdown.
The MP8762 requires a minimum number of
readily available standard external components
and are available in QFN 3X4 package.
FEATURES
• 2.5V to 5V Operating Input Range with
External 5V Bias
• 4.5V to 18V Operating Input Range with
Internal Bias
• 10A Output Current
• Low RDS(ON) Internal Power MOSFETs
• Proprietary Switching Loss Reduction
Technique
• Adaptive COT for Ultrafast Transient
Response
• 1.5% Reference Voltage Over -40°C to
+125°C Junction Temperature Range
• Programmable Soft Start Time
• Pre-Bias Start up
• Programmable Switching Frequency from
200kHz to 1MHz
• Non-latch OCP, OVP Protection 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 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
ON/OFF
C1 RFREQ
C5 R3
IN BST
FREQ
SW
EN MP8762
VCC
FB
PG
PGND
SS
AGND
C3 L1
R4 C4
C6
VOUT
R1 C2
R2
MP8762 Rev. 1.4
11/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
1 page  
MP8762 ― 10A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
PIN #
13-Pin
QFN
PIN#
16-Pin
QFN
Name
11
EN
2 2 FREQ
33
FB
44
SS
5 5 AGND
66
PG
77
88
VCC
BST
9,10 15, 16
SW
11,12
10,11,12,
13
PGND
13 9, 14
IN
Description
Enable pin. EN is a digital input that turns 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. See Enable Control section for more details.
Frequency set during CCM operation. A resistor connected between FREQ
and IN is required to set the switching frequency. The ON time is
determined by the input voltage and the resistor connected to the FREQ pin.
IN connect through a resistor is used for line feed-forward and makes the
frequency basically constant during input voltage’s variation. An optional
1nF decoupling capacitor can be added to improve any switching frequency
jitter that may be present.
Feedback. An external resistor divider from the output to GND, tapped to the
FB pin, sets the output voltage. It is recommended to place the resistor
divider as close to FB pin as possible. Vias should be avoided on the FB
traces.
Soft Start. Connect on external capacitor to program the soft start time for
the switch mode regulator.
Analog ground. Select this pin as the control circuit reference point.
Power good output, the output of this pin is an open drain signal and a pull-
up resistor connected to a DC voltage is required to indicate high if the
output voltage is higher than 91% of the nominal voltage. There is a delay
from FB ≥ 91% to PGOOD goes high.
Internal 5V LDO output. The driver and control circuits are powered from this
voltage. Decouple with a minimum 1µF ceramic capacitor as close to the pin
as possible. X7R or X5R grade dielectric ceramic capacitors are
recommended for their stable temperature characteristics.
Bootstrap. A capacitor connected between SW and BS pins is required to
form a floating supply across the high-side switch driver.
Switch Output. Connect this pin to the inductor and bootstrap capacitor. This
pin is driven up to the VIN voltage by the high-side switch during the on-time
of the PWM duty cycle. The inductor current drives the SW pin negative
during the off-time. The on-resistance of the low-side switch and the internal
Schottky diode fixes the negative voltage. Use wide PCB traces 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. Use wide PCB
traces to make the connection.
Supply Voltage. The IN pin supplies power for internal MOSFET and
regulator. The MP8762 operates from a +2.5V to +5V input rail with 5V
external bias and a +4.5V to +18V input rail with internal bias. An input
capacitor is needed to decouple the input rail. Use wide PCB traces and
multiple vias to make the connection.
MP8762 Rev. 1.4
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
MP8762 ― 10A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER
0.3V
0.75V
0. 6V
Figure 1—Functional Block Diagram
MP8762 Rev. 1.4
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 30 Páginas | |
| PDF Descargar | [ Datasheet MP8762.PDF ] | |
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