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MPQ8634B Datasheet(HTML) 11 Page - Monolithic Power Systems

Part No. MPQ8634B
Description  16V, 20A, Sync, Step-Down Converter with Adjustable Current Limit, Programmable Frequency, and Voltage Tracking
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Maker  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
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MPQ8634B Datasheet(HTML) 11 Page - Monolithic Power Systems

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MPQ8634B – 16V, 20A, SYNC, STEP-DOWN CONVERTER W/ ADJUSTABLE CURRENT LIMIT,
PROGRAMMBALE FREQUENCY, AND VOLTAGE TRACKING
MPQ8634B Rev. 1.02
www.MonolithicPower.com
11
11/16/2018
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
PIN FUNCTIONS
PIN #
Name
Description
1
BST
Bootstrap. Connect a capacitor between SW and BS to form a floating supply
across the high-side switch driver.
2
AGND
Analog ground. Select AGND as the control circuit reference point.
3
CS
Current limit. Connect a resistor to ground to set the current limit trip point. See
Equation 4 for additional details.
4
MODE
Operation mode selection. Program MODE to select continuous conduction mode
(CCM), pulse-skip mode, and the operating switching frequency (See Table 1 for
additional details.).
5
TRK/REF
External tracking voltage input. The output voltage tracks this input signal.
Decouple TRK/REF with a ceramic capacitor as close to TRK/REF as possible. X7R
or X5R grade dielectric ceramic capacitors are recommended for their stable
temperature characteristics. The capacitance of this capacitor determines the soft-
start time (See Equation 2 and 3 for additional details.).
6
VSNS-
Differential remote sense negative input. Connect VSNS- to the negative side of
the voltage sense point directly. Short VSNS- to AGND if the remote sense is not
being used.
7
FB
Feedback (differential remote sense positive input). An external resistor divider
from the output to VSNS- tapped to FB sets the output voltage. Place the resistor
divider as close to FB as possible. Vias should be avoided on the FB traces.
8
EN
Enable. EN is an input signal that turns the regulator on or off. Drive EN high to turn
on the regulator; drive EN low to turn off the regulator. Connect EN to VIN through a
pull-up resistor or a resistive voltage divider for automatic start-up. Do not float EN.
9
PGOOD
Power good output. PGOOD is an open-drain signal. A pull-up resistor connected
to a DC voltage is required to indicate high if the output voltage is within regulation.
There is ~1ms of delay from FB ≥ 92.5% to when PGOOD is asserted.
10, 21
VIN
Input voltage. VIN supplies power for the internal MOSFET and regulator. Input
capacitors are needed to decouple the input rail. Make the connection using wide
PCB traces.
11-18
PGND
System ground. PGND is the reference ground of the regulated output voltage and
requires careful consideration during PCB layout. Make the connection using wide
PCB traces.
19
VCC
Internal 3V LDO output. The driver and control circuits are powered from VCC.
Decouple VCC with a minimum 1µF ceramic capacitor as close to VCC as possible.
X7R or X5R grade dielectric ceramic capacitors are recommended for their stable
temperature characteristics.
20
SW
Switch output. Connect SW to the inductor and bootstrap capacitor. SW is driven
up to VIN by the high-side switch during the on-time of the PWM duty cycle. The
inductor current drives SW low during the off-time. Make the connection using wide
PCB traces.


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