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PDF GM6155 Data sheet ( Hoja de datos )
| Número de pieza | GM6155 | |
| Descripción | 150mA LOW - NOISE LDO REGULATOR | |
| Fabricantes | Gamma | |
| Logotipo |  |
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GM6155
150mA LOW - NOISE LDO REGULATOR
Power Management
Description
The GM6155 is an efficient linear voltage regulator with
ultralow - noise output, very low dropout voltage (typically
17mV at light loads and 100mV at 50mA), and very low
ground current (600µA at 100mA output). The GM6155 pro-
vides better than 1% initial accuracy.
Designed especially for hand-held, battery-powered de-
vices, the GM6155 includes a CMOS or TTL compatible en-
able/ shutdown control input. When shutdown, power con-
sumption drops nearly to zero. Regulator ground current in-
creases only slightly in dropout, further prolonging battery
life. Key GM6155 features include a reference bypass pin
to improve its already excellent low-noise performance, re-
versed-battery protection, current limiting, and
overtemperature shutdown.
Features
Very low noise output
Extremely accurate output voltage
Guaranteed 150mA output
Low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Reverse-battery protection
"Zero" off-mode current
Logic-controlled electronic enable
The GM6155 is available in SOT-25 package.
Application
Cellular telephones
Laptop, notebook, and palmtop computers
Battery-powered equipment
PCMCIA VCC and VPP regulation/ switching
TYPICAL APPLICATION CIRCUITS
Consumer/ personal electronics
SMPS post-regulator/ dc-to-dc modules
High-efficiency linear power supplies
VIN 1 5
2
Enable
Shutdown
34
EN
VOUT
COUT = 2.2µF
(tantalum)
EN (pin 3) may be connected
directly to IN (pin1).
CBYP
Low-Noise Operation:
CBYP = 470pF, COUT 2.2µF
Basic Operation:
CBYP = not used, COUT 1µF
www.gammamicro.com 1
PRELIMINARY
1 page  
GM6155
Applications Information
Enable/ Shutdown
Forcing EN (enable/ shutdown) high (>2V) enables the regulator. EN is compatible with CMOS logic gates. If
the enable / shutdown feature is not required, connect EN (pin 3) to IN (supply input, pin 1). See Figure 3.
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 acfilter 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 generally required to
maintain stability.
The start-up speed of the GM6155 is inversely proportional to the size of the reference bypass capacitor.
Applications requiring 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 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 470pF (see Figure 1).
Larger values improve the regulator's transient response. The output capacitor value may be increased
without limit.
The output capacitor is should have an ESR (effective series resistance) of about 5W or less and a resonant
frequency above 1MHz. Ultra-low-ESR capacitors can cause a low amplitude oscillation on the output and/
or underdamped transient response. Most tantalum or aluminum electrolytic capacitors are adequate; film
types will work, but are more expensive. Since many aluminum electrolytics have electrolytes that freeze at
about -30°C, solid tantalums ate recommended for operation below -25°C.
At lower values for 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 current below 1mA.
No-Load Stability
The GM6155 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.
Thermal Considerations
The GM6155 is designed to provide 150mA of continuous current in a very small package. Maximum power
dissipation can be calculated based on the output current and the voltage drop across the part. To determine
the maximum power dissipation of the package, use the junction-to-ambient thermal resistance of the device
and the following basic equation:
PD(max)
=
(TJ(max) -
RqJA
TA)
TJ(max) is the maximum junction temperature of the die, 125°C, and TA is the ambient operating temperature.
RqJA is layout dependent; Table 1 shows examples of junction-to-ambient thermal resistance for the GM6155.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet GM6155.PDF ] | |
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