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MP8861 Folha de dados(PDF) 13 Page - Monolithic Power Systems

Nome de Peças MP8861
Descrição Electrónicos  2.85V - 18V, 6A, High-Efficiency, Wide-Input,Synchronous, Step-Down Converter with Integrated Telemetry via I2C Interface
PDF  37 Pages
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Fabricante Electrônico  MPS [Monolithic Power Systems]
Página de início  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP8861 Folha de dados(HTML) 13 Page - Monolithic Power Systems

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MP8861 – 2.85V - 18V, 6A, SYNCHRONOUS, STEP-DOWN CONVERTER
MP8861 Rev. 1.1
www.MonolithicPower.com
13
5/28/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
PIN FUNCTIONS
QFN-14
Pin#
Name
Description
1
BST
Bootstrap. A capacitor is required between SW and BST to form a floating supply
across the high-side switch driver.
2
SW
Switch output. Connect SW using a wide PCB trace.
3
SCL
I2C serial clock.
4
SDA
I2C serial data.
5
EN
Enable. Set EN high to enable the MP8861. EN has a 1.5MΩ internal pull-down resistor
to GND. EN is a high-voltage pin, so it can be connected to VIN directly for automatic
start-up.
6
A0
I2C address set-up. Connect a resistor divider from VCC to A0 to set different I2C
addresses.
7
PG
Power good indication. PG is an open-drain structure. PG is de-asserted if the output
voltage is out of the regulation window.
8
PGND
System power ground. PGND is the reference ground of the regulated output voltage
and requires special consideration during PCB layout. Connect PGND to the ground
plane with copper traces and vias.
9
VIN
Supply voltage. The MP8861 operates from a 2.85V to 18V input rail. Decouple the
input rail with a ceramic capacitor. Connect VIN using a wide PCB trace.
10
VOUT
Output voltage sense. Connect VOUT to the positive terminal of the load.
11
FB
Feedback. Connect FB to the tap of an external resistor divider from the output to GND
to set the output voltage.
12
SS
Soft start set-up. Connect a capacitor from SS to ground to set the soft-start time.
13
VCC
Internal LDO regulator output. Decouple VCC with a 0.47µF capacitor.
14
AGND
Signal ground. If AGND is not connected to PGND internally, ensure that AGND is
connected to PGND in the PCB layout.



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