Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

AAT1218 Datasheet(PDF) 9 Page - Advanced Analogic Technologies

Part # AAT1218
Description  1A, 1.2MHz Synchronous Boost Converter
Download  15 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

AAT1218 Datasheet(HTML) 9 Page - Advanced Analogic Technologies

Back Button AAT1218 Datasheet HTML 5Page - Advanced Analogic Technologies AAT1218 Datasheet HTML 6Page - Advanced Analogic Technologies AAT1218 Datasheet HTML 7Page - Advanced Analogic Technologies AAT1218 Datasheet HTML 8Page - Advanced Analogic Technologies AAT1218 Datasheet HTML 9Page - Advanced Analogic Technologies AAT1218 Datasheet HTML 10Page - Advanced Analogic Technologies AAT1218 Datasheet HTML 11Page - Advanced Analogic Technologies AAT1218 Datasheet HTML 12Page - Advanced Analogic Technologies AAT1218 Datasheet HTML 13Page - Advanced Analogic Technologies Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 15 page
background image
AAT1218
1A, 1.2MHz Synchronous Boost Converter
SwitchRegTM
PRODUCT DATASHEET
1218.2008.10.1.1
9
www .analogictech.com
Integrated Soft-Start
During start-up, the AAT1218's integrated soft-start cir-
cuitry gradually increases the peak inductor current until
it reaches normal operating value. The inrush current
during start-up can thus be minimized.
Current Mode PWM Control
The AAT1218 is based on a slope compensated current
mode control topology. It operates at a fixed frequency
of 1.2MHz. At the beginning of each clock cycle, the main
switch (NMOS) is turned on and the inductor current
starts to ramp up. After the maximum duty cycle or if the
sense current signal is equal to the error amplifier (EA)
output, the main switch is turned off and the synchro-
nous switch (PMOS) is turned on. This control scheme
has intrinsic cycle-by-cycle current limiting, which can
prevent the main switch from overstress and prevent
saturation of the external inductor.
Power Saving Mode
At very light load, the AAT1218 automatically switches
into Power Saving Mode to improve efficiency. In this
mode, the PWM control will skip some pulses to maintain
regulation. If load increases and output voltage drops,
the device will automatically switch back to regular PWM
mode and maintain regulation.
Anti-ringing Control
Anti-ringing circuitry is included to remove the high fre-
quency ringing that appears on the LX pin when the
inductor current decreases to zero. In this case, ringing
on the LX pin is caused by energy stored in parasitics of
the MOSFETs and the inductor. The anti-ringing circuitry
clamps the voltage to battery voltage internally and thus
dampens the ringing.
Device Enable
When EN is set logic high, the AAT1218 begins operation.
If EN is set logic low, the device is goes into shutdown
mode and consumes less than 1μA current. After start-
up, the internal circuitry is supplied by VOUT during normal
operation. However, if shutdown mode is enabled, the
internal circuitry will again be supplied by the battery.
Application Information
Setting the Output Voltage
An external resistor divider is used to set the output volt-
age. The output voltage of the switching regulator (VOUT)
is determined by the following equation:
⎛⎞
⎝⎠
VOUT = 1.20V · 1 +
R1
R2
VOUT
R1 (Ω)
R2 (Ω)
3.3V
1.02M
576k
5.0V
1.02M
324k
Table 1: Resistor Selection Example for Output
Voltage Setting.
Fixed output voltage devices are also available for 3.3V
and 5V outputs. These devices integrate the feedback
network into the die and can save two external resistors.
Do not connect any component to the FB pin and leave
it floating.
Inductor Selection
The AAT1218's high switching frequency of 1.2MHz
allows for small surface mount inductors. For most
designs, the AAT1218 operates with inductors of 2.2μH
to 10μH depending on input/output voltage and load cur-
rent. First determine the worst case VIN, VOUT, and IOUT.
Then use the equation below to select the proper induc-
tor value; assume the converter is operating in continu-
ous current mode and is in steady state:
D = 1 -
VIN
VOUT
IPEAK = IRMS +
ΔI
2
ΔI =
VIN · D
L · fSW
η is the converter efficiency, IPEAK is the peak inductor
current, ΔI is the peak-peak inductor ripple current, IRMS
is the RMS current of the inductor current. fsw is the
switching frequency, L is the inductance value and D is
the steady state duty cycle.


Similar Part No. - AAT1218

ManufacturerPart #DatasheetDescription
logo
Skyworks Solutions Inc.
AAT1218 SKYWORKS-AAT1218 Datasheet
2Mb / 15P
   High Current, 1.2MHz Synchronous Boost Converterr
AAT1218IWP-1.2-T1 SKYWORKS-AAT1218IWP-1.2-T1 Datasheet
2Mb / 15P
   High Current, 1.2MHz Synchronous Boost Converterr
AAT1218IWP-3.3-T1 SKYWORKS-AAT1218IWP-3.3-T1 Datasheet
2Mb / 15P
   High Current, 1.2MHz Synchronous Boost Converterr
AAT1218IWP-5.0-T1 SKYWORKS-AAT1218IWP-5.0-T1 Datasheet
2Mb / 15P
   High Current, 1.2MHz Synchronous Boost Converterr
More results

Similar Description - AAT1218

ManufacturerPart #DatasheetDescription
logo
TECHCODE SEMICONDUCTOR,...
TD8587 TECHCODE-TD8587 Datasheet
702Kb / 13P
   1.2MHz Synchronous Boost Converter
TD8588 TECHCODE-TD8588 Datasheet
601Kb / 13P
   1.2MHz Synchronous Boost Converter
logo
Leshan Radio Company
LR8400 LRC-LR8400 Datasheet
484Kb / 18P
   1.1A 1.2MHz Synchronous Boost Converter
logo
E-CMOS Corporation
EC9288 E-CMOS-EC9288 Datasheet
963Kb / 12P
   5V 6A 1.2MHz Synchronous Boost Converter
logo
Anpec Electronics Corop...
APW7277 ANPEC-APW7277 Datasheet
387Kb / 18P
   5V 5A 1.2MHz Synchronous Boost Converter
logo
TECHCODE SEMICONDUCTOR,...
TD8577 TECHCODE-TD8577 Datasheet
949Kb / 19P
   5V 2.1A 1.2MHz Synchronous Boost Converter
logo
E-CMOS Corporation
ELP3301 E-CMOS-ELP3301 Datasheet
349Kb / 9P
   1.2MHz,30V/1A High Performance, Boost Converter
logo
ACE Technology Co., LTD...
ACE710C ACE-ACE710C Datasheet
639Kb / 8P
   1A Synchronous PWM Boost converter
VER 1.1
logo
Linear Technology
LTC3400 LINER-LTC3400 Datasheet
181Kb / 12P
   600mA, 1.2MHz Micropower Synchronous Boost Converter in ThinSOT
logo
Leshan Radio Company
LR8406 LRC-LR8406 Datasheet
618Kb / 22P
   1.2A, 1.2MHz Synchronous Boost Converter with Output Disconnect
More results


Html Pages

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


Datasheet Download

Go To PDF Page


Link URL




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

About Alldatasheet   |   Advertisement   |   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