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PDF MIC22205 Data sheet ( Hoja de datos )
| Número de pieza | MIC22205 | |
| Descripción | Synchronous Buck Regulator | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC22205 (archivo pdf) en la parte inferior de esta página. Total 29 Páginas | ||
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MIC22205
2A, Integrated, Switch, High-Efficiency,
Synchronous Buck Regulator with
Frequency Programmable up to 4MHz
General Description
The Micrel MIC22205 is a high-efficiency, 2A, integrated
switch, synchronous buck (step-down) regulator. The
MIC22205 is optimized for highest efficiency, achieving
more than 95% efficiency while still switching at 1MHz.
The ultra-high speed control loop keeps the output voltage
within regulation even under the extreme transient load
swings commonly found in FPGAs and low-voltage ASICs.
The output voltage is pre-bias safe and can be adjusted
down to 0.7V to address all low-voltage power needs.
The MIC22205 offers a full range of sequencing and
tracking options. The Enable/Delay (EN/DLY) pin,
combined with the Power Good (PG) pin, allows multiple
outputs to be sequenced in any way during turn-on and
turn-off. The Ramp Control™ (RC) pin allows the device to
be connected to another product in the MIC22xxx and/or
MIC68xxx family, to keep the output voltages within a
certain ∆V on start-up.
The MIC22205 is available in a 12-pin 3mm x 3mm MLF®
with a junction operating range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Input voltage range: 2.9V to 5.5V
• Output voltage adjustable down to 0.7V
• Output load current up to 2A
• Safe start-up into a pre-biased output
• Full sequencing and tracking capability
• Power Good (PG) output
• Efficiency > 95% across a broad load range
• Programmable frequency 300kHz to 4MHz
• Ultra-fast transient response
• Easy RC compensation
• 100% maximum duty cycle
• Fully-integrated MOSFET switches
• Thermal-shutdown and current-limit protection
• 12-pin 3mm x 3mm MLF®
• –40°C to +125°C junction temperature range
Applications
• High power density point-of-load conversion
• Servers, routers, and base stations
• DVD recorders / Blu-ray players
• Computing peripherals
• FPGAs, DSP, and low-voltage ASIC power
_________________________________________________________________________________________________________________________
Typical Application
MIC22205 2A 1MHz Synchronous Output Converter
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency (VIN = 5V)
vs. Output Current
3.3V
1.8V
VIN = 5V
0.5 1 1.5
OUTPUT CURRENT (A)
2
Ramp Control is a trademark of Micrel, Inc.
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
August 2011
M9999-082511-A
1 page  
Micrel, Inc.
MIC22205
Electrical Characteristics (4) (Continued)
SVIN = PVIN = VEN/DLY = 3.3V, VOUT = 1.8V, TA = 25°C, unless noted. Bold values indicate –40°C< TJ < +125°C.
Parameter
Condition
Min. Typ.
Power Good (PG)
PG Threshold
Hysteresis
PG Output Low Voltage
Threshold % of VFB from VREF
IPG = 5mA (sinking), VEN/DLY = 0V
−7.5 −10
2.843
139
PG Leakage Current
VPG = 5.5V; VFB = 0.9V
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
TJ Rising
151
16
Max.
−12.5
1.0
2.0
Units
%
%
mV
μA
°C
°C
August 2011
5 M9999-082511-A
5 Page 
Micrel, Inc.
Functional Characteristics (Continued)
MIC22205
August 2011
11 M9999-082511-A
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet MIC22205.PDF ] | |
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