Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF HTML

TC1313-1G1EUN Datasheet(PDF) 21 Page - Microchip Technology

Part No. TC1313-1G1EUN
Description  500 mA Synchronous Buck Regulator, 300 mA LDO
Download  32 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo 

TC1313-1G1EUN Datasheet(HTML) 21 Page - Microchip Technology

Zoom Inzoom in Zoom Outzoom out
 21 / 32 page
background image
© 2009 Microchip Technology Inc.
DS21974B-page 21
TC1313
For example, for a 3.6V input, 1.8V output with a load
of 400 mA, the efficiency taken from Figure 2-7 is
approximately 84%. The internal power dissipation is
approximately 137 mW.
5.6.2
LDO OUTPUT (VOUT2)
The internal power dissipation within the TC1313 LDO
is a function of input voltage, output voltage and output
current. The following equation can be used to
calculate the internal power dissipation for the LDO.
EQUATION 5-7:
The maximum power dissipation capability for a
package can be calculated given the junction-to-
ambient thermal resistance and the maximum ambient
temperature for the application. The following equation
can be used to determine the package’s maximum
internal power dissipation.
5.6.3
LDO POWER DISSIPATION
EXAMPLE
5.7
PCB Layout Information
Some basic design guidelines should be used when
physically placing the TC1313 on a Printed Circuit
Board (PCB). The TC1313 has two ground pins,
identified as AGND (analog ground) and PGND (power
ground). By separating grounds, it is possible to
minimize the switching frequency noise on the LDO
output. The first priority, while placing external
components on the board, is the input capacitor (CIN1).
Wiring should be short and wide; the input current for
the TC1313 can be as high as 800 mA. The next
priority would be the buck regulator output capacitor
(COUT1) and inductor (L1). All three of these
components are placed near their respective pins to
minimize trace length. The CIN1 and COUT1 capacitor
returns are connected closely together at the PGND
plane. The LDO optional input capacitor (CIN2) and
LDO output capacitor COUT2 are returned to the AGND
plane. The analog ground plane and power ground
plane are connected at one point (shown near L1). All
other signals (SHDN1, SHDN2, feedback in the
adjustable output case) should be referenced to AGND
and have the AGND plane underneath them.
FIGURE 5-1:
Component Placement,
Fixed-Output 10-Pin MSOP.
There will be some difference in layout for the 10-pin
DFN package due to the thermal pad. A typical fixed-
output DFN layout is shown below. For the DFN layout,
the VIN1 to VIN2 connection is routed on the bottom of
the board around the TC1313 thermal pad.
FIGURE 5-2:
Component Placement,
Fixed-Output 10-Pin DFN.
Input Voltage
VIN =5V ±10%
LDO Output Voltage and Current
VOUT =3.3V
IOUT = 300 mA
Internal Power Dissipation
PLDO(MAX) =(VIN(MAX) – VOUT2(MIN)) x IOUT2(MAX)
PLDO = (5.5V) – (0.975 x 3.3V))
x 300 mA
PLDO = 684.8 mW
P
LDO
V
IN MAX
()
V
OUT2 MIN
()
() I
OUT2 MAX
()
×
=
Where:
PLDO = LDO Pass device internal power
dissipation
VIN(MAX) = Maximum input voltage
VOUT(MIN) = LDO minimum output voltage
TC1313
1
2
6
8
7
9
10
5
4
3
+VOUT1
PGND
+VIN1
AGND
AGND
+VOUT2
COUT1
CIN2
COUT2
CIN1
PGND Plane
AGND Plane
L1
AGND to PGND
+VIN2
* CIN2 Optional
- Via
1
2
6
8
7
9
10
5
4
3
+VOUT1
PGND
+VIN1
AGND
AGND
+VOUT2
COUT1
CIN2
COUT2
CIN1
PGND Plane
AGND Plane
L1
AGND to PGND
PGND
*
CIN2 Optional
+VIN2
TC1313
- Via


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32 


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