Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

MCP1601 Datasheet(PDF) 12 Page - Microchip Technology

Part No. MCP1601
Description  500 mA Synchronous BUCK Regulator
Download  22 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo 

MCP1601 Datasheet(HTML) 12 Page - Microchip Technology

Zoom Inzoom in Zoom Outzoom out
 12 / 22 page
background image
MCP1601
DS21762A-page 12
 2003 Microchip Technology Inc.
5.0
APPLICATIONS INFORMATION
FIGURE 5-1:
Typical Application Circuit.
5.1
Setting Output Voltage
The MCP1601 output voltage is set by using two exter-
nal resistors for output voltages
≥ 1.2V. For output volt-
ages < 1.2V, a third 1 M
Ω series resistor is necessary
to compensate the control system. A 200 k
Ω resistor is
recommended for R2, the lower end of the voltage
divider. Using higher value resistors will make the cir-
cuit more susceptible to noise on the FB pin, causing
unstable operation. Lower value resistors can be used
down to 20 k
Ω or below, if necessary.
The feedback reference voltage for the MCP1601 is
typically 0.8V. The equation used to calculate the
output voltage is shown below.
EQUATION
Example:
Desired VOUT = 2.5V
VFB = 0.8V
R2 = 200 kΩ
R1 = 425 kΩ
5.1.1
LEAD CAPACITOR
Capacitor C1 is used for applications that utilize
ceramic output capacitors. To lower the PFM mode rip-
ple voltage, a 47 pf capacitor for C1 is used to couple
the output AC ripple voltage to the internal PFM mode
comparator. For PWM mode, only applications that use
electrolytic capacitors that have 0.2
Ω or greater of ESR
(Equivalent Series Resistance), C1 is not necessary.
5.2
Choosing External Components
5.2.1
CAPACITORS
The MCP1601 was developed to take full advantage of
the latest ceramic capacitor technology, though electro-
lytic types can be used as well. When selecting the best
capacitor for the application, the capacitance, physical
size, ESR, temperature coefficient, ripple current rat-
ings (electrolytic) and cost are considered in making
the best choice.
When selecting ceramic capacitors for COUT, the tem-
perature coefficient of the dielectric should be evalu-
ated. Two dielectrics are recommended as they are
stable over a wide temperature range (X5R and X7R).
Other dielectrics can be used, but their capacitance
should stay within the recommended range over the
entire operating temperature range.
1M
For VOUT < 1.2V ONLY
VOUT
PGND
LX
SHDN
VIN
1
2
3
4
8
7
6
5
MCP1601
FB
SYNC/
AGND
Input
Voltage
2.7V-4.2V
CIN
10 µF
10 µH
COUT
10 µF
R1
250 k
(for 1.8V)
R2
200 k
MCP1601 Application Circuit
IOUT = 0 mA to 400 mA
COUT Range
10 µF to 47 µF
L Range
10 µH to 22 µH
C1
47 pF
VOUT Range
1.2V to 3.3V
PWM
R
1
R
2
V
OUT
V
FB
() 1
[]
×
=
Where: VOUT is the desired output voltage,
VFB is the MCP1601 internal feedback
reference voltage
R1 is the resistor connected to VOUT
in the voltage divider
R2 is the resistor connected to ground
in the voltage divider


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn