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GM66300 Schematic ( PDF Datasheet ) - Gamma Microelectronics

Teilenummer GM66300
Beschreibung 3A ULTRA LOW-DROPOUT REGULATOR
Hersteller Gamma Microelectronics
Logo Gamma Microelectronics Logo 




Gesamt 11 Seiten
GM66300 Datasheet, Funktion
www.DataSheet4U.com
Description
The GM66300 series is 3.0A low-dropout linear voltage reg-
ulators that provide a low-voltage, and high-current output
with a minimum of external components.
The GM66300 series offers extremely low dropout
(typically 400mV at 3.0A) and low ground current (typically
36mA at 3.0A).
The GM66300 series is ideal for PC add-in cards that need
to convert from standard 3.0V to 2.5V and 2.5V to 1.8,
down to new, lower core voltages. A guaranteed maximum
dropout voltage of 500mV over all operating conditions
allows the GM66300 series to provide 2.5V from a supply
as low as 3V or 1.8V . The GM66300 series also has fast
transient response, for heavy switching applications. The
device requires only 47µF of output capacitance to
maintain stability and achieve fast transient response.
The GM66300 series is fully protected with overcurrent
limiting, thermal shutdown, reversed-battery protection,
reversed-lead insertion protection, and reversed-leakage
protection.
The GM66301 series offers a TTL-logic-compatible enable
pin, and an error flag that indicates undervoltage and
overcurrent conditions. Offered in a fixed voltages, 1.8V
and 2.5V, the GM66300 series comes in the TO-220 and
TO-263 packages, and is an ideal upgrade to older, NPN-
based linear voltage regulators.
The GM66030 is adjustable version.
Features
3.0A minimum guaranteed output current
500mV dropout voltage
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V conversion
1% initial accuracy
Low ground current
Current limiting and Thermal shutdown
Reversed-battery protection
Reversed-leakage protection
Fast transient response
TO-220 and TO-263 packages
TTL/CMOS compatible enable pin (GM66301 only)
Error flag output (GM66301 only)
Adjustable version (GM66302 only)
Application
LDO linear regulator for PC add-in cards
High-efficiency linear power supplies
SMPS post regulator
Multimedia and PC processor supplies
Low-voltage microcontrollers
Strong ARMTM processor supply
TYPICAL APPLICATION CIRCUITS
VIN
3.3V
VIN VOUT
GM66300 - 2.5
GND
VOUT
2.5V
+ 47µF
ENABLE
SHUTDOWN
VIN
3.3V
100kW
GM66301 - 2.5
VEN
FLG
VIN VOUT
GND
ERROR FLAG
OUTPUT
+ 47µF
VOUT
2.5V
ENABLE
SHUTDOWN
VIN
3.3V
GM66302
VEN
OUT
VIN GND Adj
10µF
1.25V
+ 47µF
www.gammamicro.com 1






GM66300 Datasheet, Funktion
APPLICATION INFORMATION
The GM66300 series is a high performance with low-
dropout voltage regulator, suitable for moderate to
high-current voltage regulator applications. Its 500mV
dropout voltage at full load makes it especially valuable
in battery-powered systems and as a high-efficiency
noise filter in post-regulator applications.
Unlike older NPN-pass transistor designs, where the
minimum dropout voltage is limited by the base-to-
emitter voltage drop and collector-to-emitter saturation
voltage. Dropout performance of the PNP output of
these devices is limited only by the low VCE saturation
Voltage.
The GM66300 series regulator is fully protected from
damage due to fault conditions. Current limiting is
provided. This limiting is linear, output current during
overload conditions is constant. Thermal shutdown
disables the device when the die temperature exceeds
the maximum safe operating temperature. Transient
protection allows device (and load) survival even when
the input voltage spikes above and below nominal. The
output structure of these regulators allows voltages in
excess of the desired output voltage to be applied
without reverse current flow.
VIN
GM66300 - X.X
VIN VOUT
VOUT
+ CIN
GND
+ COUT
Figure 10. Capacitor Requirements
Thermal Design
Linear regulators are simple to use. The most
complicated design parameters to consider are thermal
characteristics.
Thermal design requires four application-specific
parameters:
Maximum ambient temperature (TA)
Output Current (IOUT)
Output Voltage (VOUT)
Input Voltage (VIN)
Ground Current (IGND)
Calculate the power dissipation of the regulator from
these numbers and the device parameters from this
datasheet, where the ground current is taken from
data sheet
PD = (VIN - VOUT)IOUT + VIN IGND
The heat sink thermal resistance is determined by:
qSA
=TJ(MAX)
PD
-
TA
-
(qJC
+
qCS
)
where TJ(max) 125°C and qCS is between 0°C and
2°C/W.
The heat sink may be significantly reduced in
applications where the minimum input voltage is
known and is large compared with the dropout
voltage. Use a series input resistor to drop
excessive voltage and distribute the heat between
this resistor and the regulator. The low dropout
properties of Super beta PNP regulators allow
significant reductions in regulator power dissipation
and the associated heat sink without compromising
performance. When this technique is employed, a
capacitor of at least 1.0µF is needed directly
between the input and regulator ground.
Output Capacitor
The GM66300 series requires an output capacitor to
maintain stability and improve transient response.
Proper capacitor selection is important to ensure
proper operation. The GM66300 series output
capacitor selection is dependent upon the ESR
(equivalent series resistance) of the output capacitor
to maintain stability. When the output capacitor is
47µF or greater, the output capacitor should have
less than 1W of ESR. This will improve transient
response as well as promote stability. Ultra-low-ESR
capacitors, such as ceramic chip capacitors may
promote instability. These very low ESR levels may
cause an oscillation and/or underdamped transient
response. When larger capacitors are used, the
ESR requirement approaches zero. A 100µF
ceramic capacitor can be used on the output while
maintaining stability. A low-ESR 47µF solid tantalum
capacitor works extremely well and provides good
transient response and stability over temperature.
Aluminum electrolytics can also be used, as long as
the ESR of the capacitor is 1W.
The value of the output capacitor can be increased
without limit. Higher capacitance values help to
improve transient response, ripple rejection, and
reduce output noise.
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