GM6355 Datasheet, PDF (1/6 Pages) Gamma Microelectronics Inc. – 300mA LOW NOISE CMOS LDO WITH ENABLE FUNCTION

GM6355
300mA LOW NOISE CMOS LDO
WITH ENABLE FUNCTION
Description
‹
The GM6355 series is a low-dropout linear
‹
regulator. It is designed specifically for battery-
operated systems with the ground current as low
as 50μA typical. This feature significantly extends
‹
the battery life. Low power consumption and high ‹
accuracy is achieved through CMOS and
programmable fuse technologies.
‹
GM6355 offers adjustable output option with V_REF
= 0.9V as well fixed output voltages including from
‹
0.9V to 6.0V with 0.1V increment.
GM6355 consists of a high-precision voltage
reference, an error correction circuit, and a
‹
　
current limited output driver. With good transient
responses, output remains stable even during
load changes.
With its high ripple rejection ratios, this series can
be used with power supply noise. A 470pF
capacitor from the bypass (BY) input to ground
reduces noise presenting on the internal
reference, which in turn significantly reduces
output noise. If output noise is not a concern, this
input may be left unconnected. However, to use
larger capacitor values C_bp it will result in a longer
time to rated output voltage when power is initially
applied.
GM6355 incorporates both over-temperature and
over-current protection. SOT23-5 (300mW)
packages is available.
Maximum output current: 300mA
Minimum output voltage as low as
0.9V
High output voltage accuracy: ± 1.5%
Low power consumption
On chip thermal and short circuit
protections
Low dropout voltage – 300mV @
300mA
Minimum input voltage 2.0V
Application
Battery operated systems
Portable computers
Portable cameras and video recorders
Reference voltage sources
Instruments
Pagers
Typical Application Circuits
V_IN
Enable
EN
Shutdown
GM6355-x.x
1
5
2
3
4 ^BP
C_BP
V_OUT
V_IN
C_OUT = 1µF
Enable
EN
Shutdown
GM6355-Adj
1
5
V_{OUT =} V_REF (1+ R1/R2)
C_OUT = 1µF
2
R1
Adj
3
4
R2
Figure 1 Fixed output version
Figure 2. Adjustable output version
Note: EN (Pin 3) maybe connected directly to V_IN (Pin1)
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