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PDF MIC5210-1 Data sheet ( Hoja de datos )
| Número de pieza | MIC5210-1 | |
| Descripción | Dual 100mA LDO Regulator Advance Information | |
| Fabricantes | Micrel Semiconductor | |
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MIC5210
Micrel
MIC5210
Dual 100mA LDO Regulator
Advance Information
General Description
The MIC5210 is a dual linear voltage regulator with very low
dropout voltage (typically 10mV at light loads and 140mV at
100mA), very low ground current (225µA at 10mA output), and
better than 3% initial accuracy. It also features individual
logic-compatible enable/shutdown control inputs.
Designed especially for hand-held battery powered devices,
the MIC5210 can be switched by a CMOS or TTL compatible
logic signal, or the enable pin can be connected to the supply
input for 3-terminal operation. When disabled, power con-
sumption drops nearly to zero. Dropout ground current is
minimized to prolong battery life.
Key features include current limiting, overtemperature shut-
down, and protection against reversed battery.
The MIC5210 is available in 3.0V, 3.3V, 3.6V, 4.0V and 5.0V
fixed voltage configurations. Other voltages are available;
contact Micrel for details.
Features
• Micrel Mini 8™ MSOP package
• Guaranteed 100mA outputs
• Low quiescent current
• Low dropout voltage
• Wide selection of output voltages
• Tight load and line regulation
• Low temperature coefficient
• Current and thermal limiting
• Reversed input polarity protection
• Zero off-mode current
• Logic-controlled electronic enable
Applications
• Cellular telephones
• Laptop, notebook, and palmtop computers
• Battery powered equipment
• Bar code scanners
• SMPS post regulator/dc-to-dc modules
• High-efficiency linear power supplies
Ordering Information
Part Number
Voltage Accuracy Junction Temp. Range*
MIC5210-3.0BMM 3.0
1.0%
–40°C to +125°C
MIC5210-3.3BMM 3.3
1.0%
–40°C to +125°C
MIC5210-3.6BMM 3.6
1.0%
–40°C to +125°C
MIC5210-4.0BMM 4.0
1.0%
–40°C to +125°C
MIC5210-5.0BMM 5.0
1.0%
–40°C to +125°C
Other voltages available. Contact Micrel for details.
Package
8-lead MSOP
8-lead MSOP
8-lead MSOP
8-lead MSOP
8-lead MSOP
Typical Application
Output A
Output B
1µF
2.2µF
MIC5210
18
2 7 Enable A
3
4
CBYP
470µF
6
5 Enable B
1µF
Enable may be connected to VIN
Low-Noise + Ultralow-Noise (Dual) Regulator
MM8 and Micrel Mini 8 are trademarks of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
April 1997•
1
MIC5210
1 page  
MIC5210
Micrel
Applications Information
Enable/Shutdown
Forcing EN (enable/shutdown) high (> 2V) enables the regu-
lator. EN is compatible with CMOS logic gates.
If the enable/shutdown feature is not required, connect EN to
IN (supply input).
Input Capacitor
A 1µF capacitor should be placed from IN to GND if there is
more than 10 inches of wire between the input and the ac filter
capacitor or if a battery is used as the input.
Reference Bypass Capacitor
BYP (reference bypass) is connected to the internal voltage
reference. A 470pF capacitor (CBYP) connected from BYP to
GND quiets this reference, providing a significant reduction in
output noise. CBYP reduces the regulator phase margin; when
using CBYP, output capacitors of 2.2µF or greater are gener-
ally required to maintain stability.
The start-up speed of the MIC5210 is inversely proportional to
the size of the reference bypass capacitor. Applications re-
quiring a slow ramp-up of output voltage should consider
larger values of CBYP. Likewise, if rapid turn-on is necessary,
consider omitting CBYP.
If output noise is not a major concern, omit CBYP and leave
BYP open.
Output Capacitor
An output capacitor is required between OUT and GND to
prevent oscillation. The minimum size of the output capacitor
is dependent upon whether a reference bypass capacitor is
used. 1.0µF minimum is recommended when CBYP is not
used (see Figure 2). 2.2µF minimum is recommended when
CBYP is 470µF (see Figure 1). Larger values improve the
regulator’s transient response. The output capacitor value
may be increased without limit.
The output capacitor should have an ESR (effective series
resistance) of about 5Ω or less and a resonant frequency
above 1MHz. Most tantalum or aluminum electrolytic capaci-
tors are adequate; film types will work, but are more expen-
sive. Since many aluminum electrolytics have electrolytes
that freeze at about –30°C, solid tantalums are recommended
for operation below –25°C.
At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to
0.47µF for current below 10mA or 0.33µF for currents below
1mA.
No-Load Stability
The MIC5210 will remain stable and in regulation with no load
(other than the internal voltage divider) unlike many other
voltage regulators. This is especially important in CMOS RAM
keep-alive applications.
Dual-Supply Operation
When used in dual supply systems where the regulator load
is returned to a negative supply, the output voltage must be
diode clamped to ground.
Thermal Considerations
Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.
The MIC5210-xxBMM (8-lead MSOP) has a thermal resis-
tance of 200°C/W when mounted on a FR4 board with
minimum trace widths and no ground plane.
PC Board
Dielectric
θJA
FR4 200°C
MSOP Thermal Characteristics
For additional heat sink characteristics, please refer to Micrel
Application Hint 17, “Calculating P.C. Board Heat Sink Area
For Surface Mount Packages”.
April 1997•
5
MIC5210
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MIC5210-1.PDF ] | |
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