Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LTC1515 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC1515
Description  Step-Up/Step-Down Switched Capacitor DC/DC Converters with Reset
Download  8 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1515 Datasheet(HTML) 6 Page - Linear Technology

  LTC1515 Datasheet HTML 1Page - Linear Technology LTC1515 Datasheet HTML 2Page - Linear Technology LTC1515 Datasheet HTML 3Page - Linear Technology LTC1515 Datasheet HTML 4Page - Linear Technology LTC1515 Datasheet HTML 5Page - Linear Technology LTC1515 Datasheet HTML 6Page - Linear Technology LTC1515 Datasheet HTML 7Page - Linear Technology LTC1515 Datasheet HTML 8Page - Linear Technology  
Zoom Inzoom in Zoom Outzoom out
 6 / 8 page
background image
6
LTC1515 Series
Output Voltage Selection
The LTC1515-X versions have internal resistor networks
which set the output voltage. The 5/3 pin controls an
internal switch that shorts out a portion of the resistor
network to change the output voltage. A logic high on this
pin produces a 5V output and a low produces either a 3V
output or a 3.3V output.
The output voltage of the LTC1515 is selected using an
external resistor divider (see Figure 1). The output voltage
is determined using the following formula:
VOUT = (1.232V)[1 + (R1/R2)]
The total resistance of R1 and R2 should not exceed 2M,
otherwise excess ripple may appear at VOUT.
APPLICATIONS INFORMATION
Figure 1. LTC1515 Output Voltage Selection
SHDN
POR
GND
FB
VOUT
VIN
C1
C1+
LTC1515
1
2
3
4
8
7
6
5
LTC1515 • F01
R1
R2
Maximum VOUT and IOUT Calculations for the LTC1515
The maximum output voltage and current available with
the LTC1515 can be calculated based on the effective
output resistance of the charge pump and the open circuit
output voltage. In step-up mode, the open circuit output
voltage is approximately 2VIN (see Figure 2). In step-down
mode, the open circuit output voltage equals VIN. The
relationship between ROUT and VIN in step-up mode is shown
in Figure 3.
The following formulas can be used to find the maximum
output voltage that may be programmed using the LTC1515
for a given minimum input voltage and output current
load.
Step-Up Mode: Max VOUT = (2)(Min VIN) – (IOUT)(ROUT)
Step-Down Mode: Max VOUT = (Min VIN) – (IOUT)(ROUT)
When VIN – (IOUT)(ROUT) is less than the programmed
VOUT, the part will automatically switch from step-down
mode to step-up mode. In both step-up mode and step-
+
+
IOUT
COUT
2VIN
ROUT
VOUT
LT1515 • F02
Figure 2. Step-Up Mode Equivalent Circuit
INPUT VOLTAGE (V)
1
20
30
5
LT1515 • F03
10
0
2
3
4
40
IOUT = 50mA
IOUT = 20mA
Figure 3. Step-Up Mode ROUT vs Input Voltage
down mode, ROUT is internally adjusted to ensure that the
maximum output current rating can be met.
Capacitor Selection
For best performance, low ESR capacitors are recom-
mended for both CIN and COUT to reduce noise and ripple.
The CIN and COUT capacitors should be either ceramic or
tantalum and should be 10
µForgreater.Iftheinputsource
impedance is very low (< 0.5
Ω) CIN may not be needed.
Increasing the size of COUT to 22µF or greater will reduce
output voltage ripple — particularly with high VIN voltages
(8V or greater). A ceramic capacitor is recommended for
the flying capacitor C1 with a value of 0.1
µF or 0.22µF.
Smaller values may be used in low output current
applications.
Output Ripple
Normal LTC1515 series operation produces voltage ripple
on the VOUT pin. Output voltage ripple is required for the
parts to regulate. Low frequency ripple exists due to the
hysteresis in the sense comparator and propagation de-
lays in the charge pump enable/disable circuits. High
frequency ripple is also present mainly from the ESR


Similar Part No. - LTC1515

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC1515 LINER-LTC1515 Datasheet
233Kb / 8P
   Step-Up/Step-Down Switched Capacitor DC/DC Converters with Reset
LTC1515 LINER-LTC1515 Datasheet
268Kb / 16P
   Switched-Capacitor Voltage Converter with Regulator
LTC1515 LINER-LTC1515 Datasheet
196Kb / 12P
   High Voltage, Low Quiescent Current
logo
Linear Integrated Syste...
LTC1515 LINEAR-LTC1515 Datasheet
144Kb / 8P
   Micropower, Regulated 3.3V Charge Pump in a 5-Pin SOT-23 Package
logo
Analog Devices
LTC1515 AD-LTC1515 Datasheet
1Mb / 14P
   High Voltage Boost Charge Pump
08/19 Rev. 0
More results

Similar Description - LTC1515

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC1515 LINER-LTC1515 Datasheet
233Kb / 8P
   Step-Up/Step-Down Switched Capacitor DC/DC Converters with Reset
LTC1514-5 LINER-LTC1514-5_15 Datasheet
221Kb / 8P
   Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator
LTC1514-3.3 LINER-LTC1514-3.3 Datasheet
215Kb / 8P
   Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator
LTC1514-3.3 LINER-LTC1514-3.3_15 Datasheet
221Kb / 8P
   Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator
logo
Maxim Integrated Produc...
MAX20021 MAXIM-MAX20021 Datasheet
2Mb / 16P
   Step-Down DC-DC Converters
Rev 2; 12/13
MAX15062 MAXIM-MAX15062 Datasheet
1Mb / 23P
   Step-Down DC-DC Converters
Rev 1; 10/13
MAX20028 MAXIM-MAX20028 Datasheet
1Mb / 24P
   Step-Down Controller with Dual 2.1MHz Step-Down DC-DC Converters
Rev 6; 3/20
MAX16993 MAXIM-MAX16993 Datasheet
1Mb / 25P
   Step-Down Controller with Dual 2.1MHz Step-Down DC-DC Converters
Rev 0; 5/13
MAX16993 MAXIM-MAX16993_V01 Datasheet
1Mb / 24P
   Step-Down Controller with Dual 2.1MHz Step-Down DC-DC Converters
2016
logo
Linear Technology
LTC3523 LINER-LTC3523_15 Datasheet
263Kb / 16P
   Synchronous 600mA Step-Up and 400mA Step-Down DC/DC Converters
More results


Html Pages

1 2 3 4 5 6 7 8


Datasheet Download

Go To PDF Page


Link URL




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

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   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
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com