Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LTC3526L-2 Datasheet(PDF) 8 Page - Linear Technology

Part # LTC3526L-2
Description  550mA 2MHz Synchronous Step-Up DC/DC Converters
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3526L-2 Datasheet(HTML) 8 Page - Linear Technology

Back Button LTC3526L-2 Datasheet HTML 4Page - Linear Technology LTC3526L-2 Datasheet HTML 5Page - Linear Technology LTC3526L-2 Datasheet HTML 6Page - Linear Technology LTC3526L-2 Datasheet HTML 7Page - Linear Technology LTC3526L-2 Datasheet HTML 8Page - Linear Technology LTC3526L-2 Datasheet HTML 9Page - Linear Technology LTC3526L-2 Datasheet HTML 10Page - Linear Technology LTC3526L-2 Datasheet HTML 11Page - Linear Technology LTC3526L-2 Datasheet HTML 12Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 16 page
background image
LTC3526L-2/LTC3526LB-2

3526lb2fa
exceeds the input by 0.24V, the IC powers itself from
VOUT instead of VIN. At this point the internal circuitry has
no dependency on the VIN input voltage, eliminating the
requirement for a large input capacitor. The input voltage
can drop as low as 0.5V. The limiting factor for the ap-
plication becomes the availability of the power source to
supply sufficient energy to the output at low voltages, and
maximum duty cycle, which is clamped at 90% typical.
Note that at low input voltages, small voltage drops due
to series resistance become critical, and greatly limit the
power delivery capability of the converter.
LOW NOISE FIXED FREQUENCY OPERATION
Soft-Start
The LTC3526L-2/LTC3526LB-2 contain internal circuitry
to provide soft-start operation. The soft-start circuitry
slowly ramps the peak inductor current from zero to its
peak value of 750mA (typical) in approximately 0.5ms,
allowing start-up into heavy loads. The soft-start circuitry
is reset in the event of a shutdown command or a thermal
shutdown.
Oscillator
An internal oscillator sets the switching frequency to
2MHz.
Shutdown
Shutdown is accomplished by pulling the SHDN pin
below 0.3V and enabled by pulling the SHDN pin above
0.8V. Although SHDN can be driven above VIN or VOUT
(up to the absolute maximum rating) without damage,
the LTC3526L-2/LTC3526LB-2 have a proprietary test
mode that may be engaged if SHDN is held in the range
of 0.5V to 1V higher than the greater of VIN or VOUT. If
the test mode is engaged, normal PWM switching action
is interrupted, which can cause undesirable operation
in some applications. Therefore, in applications where
SHDN may be driven above VIN, a resistor divider or other
means must be employed to keep the SHDN voltage below
(VIN + 0.4V) to prevent the possibility of the test mode
being engaged. Please refer to Figure 1 for two possible
implementations.
Error Amplifier
The positive input of the transconductance error amplifier
is internally connected to the 1.195V reference and the
negative input is connected to FB. Clamps limit the mini-
mumandmaximumerrorampoutputvoltageforimproved
large-signal transient response. Power converter control
loop compensation is provided internally. An external
resistive voltage divider from VOUT to ground programs
the output voltage via FB from 1.5V to 5.25V.
V
V
R
R
OUT =
+


1 195
1
2
1
.
Current Sensing
Losslesscurrentsensingconvertsthepeakcurrentsignalof
theN-channelMOSFETswitchintoavoltagethatissummed
with the internal slope compensation. The summed signal
is compared to the error amplifier output to provide a peak
current control command for the PWM.
Current Limit
The current limit comparator shuts off the N-channel
MOSFET switch once its threshold is reached. The cur-
rent limit comparator delay to output is typically 60ns.
Peak switch current is limited to approximately 750mA,
independent of input or output voltage, unless VOUT falls
below 0.7V, in which case the current limit is cut in half.
(Refer to Block Diagram)
operaTion
ZETEX ZC2811E
3526lb2 F01
LTC3526L-2/LTC3526LB-2
SHDN
VIN
VCNTRL
4M
±30%
LTC3526L-2/LTC3526LB-2
SHDN
4M
±30%
1M
R
VCNTRL
1M
R > (VCNTRL/(VIN + 0.4) – 1)M
Figure 1. Recommended Shutdown Circuits when Driving
SHDN above VIN


Similar Part No. - LTC3526L-2

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC3526L-2 LINER-LTC3526L-2 Datasheet
1Mb / 18P
   400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up
LTC3526L-2 LINER-LTC3526L-2 Datasheet
286Kb / 16P
   500mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm X 2mm DFN
More results

Similar Description - LTC3526L-2

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC3526LB-2 LINER-LTC3526LB-2_15 Datasheet
343Kb / 16P
   550mA 2MHz Synchronous Step-Up DC/DC Converters
LTC3526LB LINER-LTC3526LB_15 Datasheet
349Kb / 16P
   550mA 1MHz Synchronous Step-Up DC/DC Converters
LTC3526L LINER-LTC3526L_15 Datasheet
349Kb / 16P
   550mA 1MHz Synchronous Step-Up DC/DC Converters
LTC3526-2 LINER-LTC3526-2_15 Datasheet
346Kb / 16P
   500mA 2MHz Synchronous Step-Up DC/DC Converters
LTC3526B-2 LINER-LTC3526B-2_15 Datasheet
346Kb / 16P
   500mA 2MHz Synchronous Step-Up DC/DC Converters
LTC3539-2 LINER-LTC3539-2_15 Datasheet
195Kb / 14P
   2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters
LTC3539 LINER-LTC3539_15 Datasheet
195Kb / 14P
   2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters
LTC3539 LINER-LTC3539 Datasheet
171Kb / 12P
   2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters
LTC3526L LINER-LTC3526L Datasheet
271Kb / 16P
   550mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm 횞 2mm DFN
LTC3528-2 LINER-LTC3528-2_15 Datasheet
401Kb / 18P
   1A, 2MHz Synchronous Step-Up DC/DC Converter
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


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