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PDF MIC22400 Data sheet ( Hoja de datos )
| Número de pieza | MIC22400 | |
| Descripción | 4A Integrated Switch Synchronous Buck Regulator | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC22400 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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MIC22400
4A Integrated Switch Synchronous
Buck Regulator with Frequency
Programmable up to 4MHz
General Description
The Micrel MIC22400 is a high efficiency 4A integrated
switch synchronous buck (step-down) regulator. The
MIC22400 is optimized for highest efficiency and achieves
over 90% efficiency while still switching at 1MHz over a
www.DatabtShrheoeaeotd4uUlto.pcauodmt
range. The ultra high speed control loop keeps
voltage within regulation even under extreme
transient load swings commonly found in FPGAs and low
voltage ASICs. The output voltage can be adjusted down
to 0.7V to address all low voltage power needs. A full
range of sequence options are available with the
MIC22400. The enable/delay pin combined with the power
good pin allows multiple outputs to be sequenced in any
way on turn on and turn off. The RC (Ramp Control™) pin
allows the device to be connected to another MIC22400
family of products to keep the output voltages within a
certain ∆V on start up.
The MIC22400 is available in a 20-pin 3mm x 4mm MLF®
and thermally enhanced 20-pin e-TSSOP 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: 2.6V to 5.5V
• Output voltage adjustable down to 0.7V
• Output current up to 4A
• Full sequencing and tracking ability
• Power on reset
• Efficiency > 90% across a broad load range
• Programmable frequency 800kHz to 4MHz
• Easy RC compensation
• Ultra fast transient response
• 100% maximum duty cycle
• Fully integrated MOSFET switches
• Micropower shutdown
• Thermal shutdown and current limit protection
• 20-pin 3mm x 4mm MLF®
• 20-pin e-TSSOP
• –40°C to +125°C junction temperature range
Applications
• High power density point of load conversion
• Servers and routers
• DVD recorders
• Computing peripherals
• Base stations
• FPGAs, DSP and low voltage ASIC power
Typical Application
MIC22400 4A Synchronous Buck Regulator
Efficiency VO = 3.3V
100
95
90
85
80
75
70
65
600 0.5 1 1.5 2 2.5 3 3.5 4 4.5
OUTPUT CURRENT (A)
Sequencing & Tracking
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
February 2008
M9999-022108-A
1 page  
Micrel, Inc.
Typical Characteristics
Shutdown Current
vs. Input Voltage
10
8
6
25°C
4
2
20.5 3.0 3.5 4.0 4.5 5.0 5.5
www.DataSheet4U.com INPUT VOLTAGE (V)
Operating Current
vs. Temperature
2.0
1.6
1.2
0.8
0.4
No Switching
FB = 0.9V
VIN = 3.3V
0
TEMPERATURE (°C)
Enable Voltage
vs. Temperature
1.30
1.26
1.22
1.18
1.14
1.10
VIN = 3.3V
TEMPERATURE (°C)
P-Channel RDSON
vs. Temperature
65
63
61
59
57
55
TEMPERATURE (°C)
February 2008
Shutdown Current
vs. Temperature
10
8
6
4
2
0
0.710
VIN = 3.3V
TEMPERATURE (°C)
Reference Voltage
vs. Input Voltage
0.705
0.700
0.695
25°C
0.6920.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Enable Hysterisis
vs. Temperature
8
7
6
5
4
3
2
1 VIN = 3.3V
0
TEMPERATURE (°C)
N-Channel RDSON
vs. Temperature
40
38
36
34
32
30
TEMPERATURE (°C)
5
MIC22400
Operating Current
vs. Input Voltage
2.0
1.6
1.2
0.8
0.4
20.5
No Switching
FB = 0.9V
25°C
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
0.710
Reference Voltage
vs. Temperature
0.705
0.700
0.695
0.690
1060
1040
1020
1000
980
960
940
920
900
VIN = 3.3V
TEMPERATURE (°C)
Frequency
vs. Temperature
TEMPERATURE (°C)
M9999-022108-A
5 Page 
Micrel, Inc.
Functional Description
PVIN
PVIN is the input supply to the internal 60mΩ P-Channel
Power MOSFET. This should be connected externally to
the SVIN pin. The supply voltage range is from 2.6V to
5.5V. A 10µF ceramic is recommended for bypassing
each PVIN supply.
EN
This pin is internally fed with a 1µA current source to
VIN. A delayed turn on is implemented by adding a
capacitor to this pin. The delay is proportional to the
capacitor value. The internal circuits are held off until EN
www.DatarSehaeceht4eUs.ctohme enable threshold of 1.24V.
RC
RC allows the slew rate of the output voltage to be
programmed by the addition of a capacitor from RC to
ground. RC is internally fed with a 1µA current source
and VOUT slew rate is proportional to the capacitor and
the 1µA source.
Delay
Adding a capacitor to this pin allows the delay of the
POR signal.
When VOUT reaches 90% of its nominal voltage, the
Delay pin current source (1µA) starts to charge the
external capacitor. At 1.24V, POR is asserted high.
Comp
The MIC22400 uses an internal compensation network
containing a fixed frequency zero (phase lead response)
and pole (phase lag response) which allows the external
compensation network to be much simplified for stability.
The addition of a single capacitor and resistor will add
the necessary pole and zero for voltage mode loop
stability using low value, low ESR ceramic capacitors.
MIC22400
FB
The feedback pin provides the control path to control the
output. A resistor divider connecting the feedback to the
output is used to adjust the desired output voltage. Refer
to the feedback section in the “Applications Information”
for more detail.
POR
This is an open drain output. A 47k resistor can be used
for a pull up to this pin. POR is asserted high when
output voltage reaches 90% of nominal set voltage and
after the delay set by CDELAY. POR is asserted low
without delay when enable is set low or when the output
goes below the -10% threshold. For a Power Good (PG)
function, the delay can be set to a minimum. This can be
done by removing the Delay capacitor.
SW
This is the connection to the drain of the internal P-
Channel MOSFET and drain of the N-Channel MOSFET.
This is a high frequency high power connection;
therefore traces should be kept as short and as wide as
practical.
CF
Adding a capacitor to this pin can adjust switching
frequency from 800kHz to 4MHz.
SGND
Internal signal ground for all low power sections.
PGND
Internal ground connection to the source of the internal
N-Channel MOSFETs.
February 2008
11 M9999-022108-A
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MIC22400.PDF ] | |
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