GM6655 Datasheet, PDF (1/7 Pages) Gamma Microelectronics Inc. – 600mA LOW DROPOUT CMOS VOLTAGE REGULATOR WITH ENABLE FUNCTION

GM6655
600mA LOW DROPOUT CMOS VOLTAGE
REGULATOR WITH ENABLE FUNCTION
Description
The GM6655 series is a low-dropout linear regulator.
This series is specially designed for battery-operated
systems. The ground current is very low (50µA Typ),
that significantly extending battery life. Low power
consumption and high accuracy is achieved through
CMOS and programmable fuse technologies with the
output voltage range from 1.5V to 6.0V.
The GM6655 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. The
SHDN input enables the output to be turned off,
resulting in reduced power consumption.
Also, the GM6655 having high ripple rejection ratios,
the series can be used with power supply noise. A
470pF capacitor from the bypass input to ground
reduces noise present on the internal reference, which
in turn significantly reduces output noise. If output
noise is not a concern, this input may be left
unconnected. Larger capacitor values C_bp be used, but
results in a longer time period to rated output voltage
when power is initially applied.
The GM6655 incorporates both over-temperature and
over-current protection.
Features
‹ Maximum output current up 600mA
‹ Highly accurate output voltage:
±1.5%
‹ Low power consumption
‹ On-chip protections: Thermal, and
Short Circuit
‹ Small input/output differential:
600mV at 600mA
Application
Battery Operated Systems
Portable Computers
Portable Caremas and Video Recorders
Reference Voltage Sources
Instruments
Pagers
Typical Application Circuits
V_IN
Enable
EN
Shutdown
GM6655-x.x
1
5
2
BP
3
4
V_OUT
C_OUT = 1µF
C_BP
V_IN
Enable
EN
Shutdown
GM6655-Adj
1
5
2
Adj
3
4
V_{OUT =} V_REF (1+ R2/R1)
C_OUT = 1µF
R1
R2
Figure 1 Fixed output version
Figure 2. Adjustable output version
Note: EN (Pin 3) maybe connected directly to V_IN (Pin1)
1