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PDF MIC94345 Data sheet ( Hoja de datos )
| Número de pieza | MIC94345 | |
| Descripción | 500mA LDO | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC94345 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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MIC94325/45/55
500mA LDO with
Ripple Blocker Technology
General Description
Features
The MIC943x5 Ripple Blocker is a monolithic integrated
circuit that provides low-frequency ripple attenuation
(switching noise rejection) to a regulated output voltage.
This is important for applications where a DC/DC switching
converter is required to lower or raise a battery voltage but
where switching noise cannot be tolerated by sensitive
1.8V to 3.6V input voltage range
Active noise rejection over a wide frequency band
>50dB from 10Hz to 5MHz at 500mA load
Rated to 500mA output current
Fixed and adjustable output voltages
downstream circuits such as in RF applications. The
MIC943x5 maintains high power supply ripple rejection
(PSRR) with input voltages operating near the output
voltage level to improve overall system efficiency. A low-
voltage logic enable pin facilitates ON/OFF control at
Optional output auto-discharge when disabled
Current-limit and thermal-limit protected
Ultra-small 0.84mm x 1.32mm 6-ball CSP
1.6mm x 1.6mm, 6-pin Thin DFN
typical GPIO voltage levels.
Logic-controlled enable pin
The MIC943x5 operates from an input voltage of 1.8V to 40C to +125C junction temperature range
3.6V. The MIC943x5 options include fixed (MIC94345/55)
or adjustable (MIC94325) output voltages. The MIC94355
version offers an auto-discharge to discharge the output
Applications
capacitor when the part is disabled.
Smart phones
Packaged in a 0.84mm x 1.32mm 6-ball CSP or a 6-pin
1.6mm x 1.6mm Thin DFN, the MIC943x5 has a junction
operating temperature range of –40C to +125C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Tablet PC/notebooks and webcams
Digital still and video cameras
Global positioning systems
Mobile computing
Automotive and industrial applications
_________________________________________________________________________________________________
Typical Application
MIC94355 PSRR
COUT = 4.7µF
0
VIN = 2.8V + 40mVpp
-20 VOUT = 1.8V
COUT = 4.7µF
-40
500mA
-60
-80 10mA
-100
-120
10
200mA
100 1,10K00 101,00K00 1010,00K0 1,010M0,0 1100,0M00,
0 00 000
FREQUENCY (Hz)
Ripple Blocker is a trademark of Micrel, Inc
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2012
M9999-102512-A
1 page  
Micrel, Inc.
Functional Block Diagrams (Continued)
MIC94325/45/55
MIC94355 Fixed Output with Auto-Discharge
October 2012
5 M9999-102512-A
5 Page 
Micrel, Inc.
PD = (VIN – VOUT1) I OUT + VIN IGND
Because this device is CMOS and the ground current is
typically <170µA over the load range, the power
dissipation contributed by the ground current is <1% and
can be ignored for this calculation.
PD = (2.5V – 1.8V) × 500mA
PD = 0.35W
To determine the maximum ambient operating
temperature of the package, use the junction-to-ambient
thermal resistance of the device and the following basic
equation:
PD(MAX)
T J(max)
θ JA
TA
TJ(max) = 125°C, the maximum junction temperature of the
die, θJA thermal resistance = 160°C/W for the YCS
package and 92°C/W for the Thin DFN package.
Substituting PD for PD(MAX) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC94325-GYMT at
an input voltage of 2.5V and 500mA load with a
minimum footprint layout, the maximum ambient
operating temperature TA can be determined as follows:
0.35W = (125°C – TA)/(92°C/W)
TA = 92°C
Therefore, the maximum ambient operating temperature
allowed in a 1.6mm x 1.6mm Thin DFN package is 92°C.
For a full discussion of heat sinking and thermal effects
on voltage regulators, refer to the “Regulator Thermals”
section of Micrel’s Designing with Low-Dropout Voltage
Regulators handbook. This information can be found on
Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk.pdf
http://www.micrel.com/_PDF/other/LDO%20SG.B.pdf
MIC94325/45/55
For more information about Micrel’s Ripple Blocker
products, go to:
http://www.micrel.com/index.php/en/products/power-
management-ics/ldos/linear-power-filters.html
http://www.micrel.com/index.php/en/products/power-
management-ics/ldos/linear-power-filters/article/1-
mic94300.html
http://www.micrel.com/index.php/en/products/power-
management-ics/ldos/linear-power-filters/article/3-
mic94310.html
October 2012
11 M9999-102512-A
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MIC94345.PDF ] | |
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