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MIC5355 Schematic ( PDF Datasheet ) - Micrel Semiconductor

Teilenummer MIC5355
Beschreibung Micropower Linear Regulator
Hersteller Micrel Semiconductor
Logo Micrel Semiconductor Logo 




Gesamt 18 Seiten
MIC5355 Datasheet, Funktion
MIC5355/6
Dual 500mA µCap Low Dropout,
Micropower Linear Regulator
General Description
The MIC5355/6 is an advanced dual, micropower, low
dropout linear regulator. The MIC5355/6 provides low
quiescent current operation, using only 70μA with both
outputs enabled making it ideal for battery-powered
systems. In shutdown, the quiescent current drops to less
than 1µA. The MIC5355/6 provides two independently-
controlled high-performance 500mA LDOs with typical
dropout voltage of 350mV at rated load. In addition, the
MIC5355/6 is optimized to provide fast load and line
transient performance with low-ESR ceramic output
capacitors, requiring a minimum of only 2.2µF.
The MIC5356 also incorporates an active discharge
feature when the part is disabled that switches in a 30
load to pull down the output of the regulator. The
MIC5355/6 is available in fixed output voltages in a
thermally-enhanced 8-pin ePad MSOP package or 8-pin
ePad 3mm x 3mm MLF® package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
2.5V to 5.5V input voltage range
2% initial output accuracy
Wide output voltage range: 1.0V to 3.3V
Low quiescent current: 38µA per output
Very low quiescent current in shutdown: <1μA typical
µCap stable with 2.2µF ceramic capacitor
Low dropout voltage: 350mV at 500mA
Excellent load/line transient response
Independent logic controlled enable pins
Output discharge circuit: MIC5356
Current and thermal limit protection
Power 8-pin ePad MSOP package or 8-pin ePad 3mm
x 3mm MLF® package
Applications
Smart phones
GPS, PMP, DSC
Notebooks and desktops
Digital TV
Portable electronics
_________________________________________________________________________________________________________________________
Typical Application
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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
March 2012
M9999-031512-A






MIC5355 Datasheet, Funktion
Micrel, Inc.
Typical Characteristics (Continued)
Ground Current
vs. Temperature (Dual Output)
120
500mA
100
80
60 NO LOAD
40 VOUT1 = 2.5V, VOUT2 = 1.8V
20 VEN1 = VEN2 = VIN = 3.5V
CIN = COUT = 2.2μF
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature
450 CIN = COUT = 2.2μF
400
350 500mA
300 300mA
250
200 150mA
150
100 50mA
50
0
-40 -20 0
20 40 60 80 100 120
TEMPERATURE (°C)
Current Limit
vs. Input Voltage
900
850 VOUT1 = 2.5V
800
750
700
650
600
2.5
VOUT2 = 1.8V
CIN = COUT = 2.2μF
3 3.5 4 4.5 5
INPUT VOLTAGE (V)
5.5
Output Noise Spectral Density
1
0.1
0.01
VIN = 3.5V
VOUT2 = 1.81V
CIN - COUT = 2.2µF
Noise (10Hz to 100Khz) =146µVrms
0.001
10 100 1000 10000 100000 1000000
FREQUENCY (Hz)
MIC5355/6
Dropout Voltage
vs. Output Current
350
300
250
200
150
100
50
0
0
VOUT1 = 2.5V
CIN = COUT = 2.2μF
100 200 300 400
OUTPUT CURRENT (mA)
500
March 2012
6 M9999-031512-A

6 Page









MIC5355 pdf, datenblatt
Micrel, Inc.
Typical Application Schematic (Continued)
MIC5355/6
Bill of Materials
Item
Part Number
C1, C2, C3 C1005X5R0J225M
U1 MIC5355/6-xxYML
Notes:
3. TDK: www.tdk.com.
4. Micrel, Inc.: www.micrel.com.
Manufacturer
TDK(1)
Micrel, Inc.(2)
Description
2.2µF ceramic capacitor, 6.3V, X5R, size 0402
Dual 500mA µCap Low-Dropout, Micropower Linear Regulator
Qty.
3
1
March 2012
12 M9999-031512-A

12 Page





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