Revision 1, May 2002 www.gammamicro.com
80mA LOW-DROPOUT LINEAR VOLTAGE REGULATORS
GM6080
PRELIMINARY
1
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
The GM6080 is an 80mA linear voltage regulator in the SOT-353 package. With half the footprint of an SOT-
23 package, this SOT-353 regulator has very low dropout voltage (from typically 20mV at light loads to 300mV
at 80mA) and very low ground current (225
A at 20mA output). It includes a logic-compatible enable input and
provides better than 3% initial accuracy.
The GM6080 is designed for optimal performance with low-value, low-cost ceramic capacitors. In most
applications only 0.47
F of output capacitance is required for stability.
The GM6080 is designed specifically for battery-powered devices. It can be controlled by a CMOS or TTL
compatible logic signal. When disabled, power consumption drops practically to zero. If ON/OFF control is not
required, the enable pin may be tied to the input for 3-terminal operation.
To further enhance battery life, the ground current of the GM6080 increases only slightly in dropout. Notable
features include current limiting, overtemperature shutdown, and protection against reversed battery connection.
The GM6080 is available in 2.5V, 2.6V, 2.7V, 2.8V, 3.0V, 3.3V, and 3.6V fixed voltages. Other voltages are
available by special order.
Wide Selection of Output Voltages
Guaranteed 80mA Output
Low Quiescent Current
Low Dropout Voltage
Tight Load and Line Regulation
Low Temperature Coefficient
Current and Thermal Limiting
Reversed Input Polarity Protection
Zero OFF-Mode Current
Logic-Controlled Shutdown
Stability with Low-ESR Ceramic Capacitors
SOT-353 Package
Applications:
Cellular Phones
Laptop and Notebook Computers
Palmtops and PDA's
Battery-Powered Equipment
Bar Code Scanners
SMPS Post-Regulator/DC-to-DC Modules
High-Efficiency Linear Power Supplies
GND NC EN
IN
OUT
SOT-353-5
3
2
1
5
4
2
1
3
4
5
+
0.47
F
V
O UT
Enable
Shutdown
Regulator Circuit
(Top View)
Revision 1, May 2002 www.gammamicro.com
80mA LOW-DROPOUT LINEAR VOLTAGE REGULATORS
GM6080
PRELIMINARY
2
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ORDERING INFORMATION
Revision 1, May 2002 www.gammamicro.com
80mA LOW-DROPOUT LINEAR VOLTAGE REGULATORS
GM6080
PRELIMINARY
3
ELECTRICAL CHARACTERISTICS
V
IN
= V
OUT
+ 1V; I
L
= 1mA; C
L
= 0.47
F; V
EN
2.0V; T
J
= 25C, bold values indicate 40C
T
J
+125C; unless noted.
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Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended.
Note 4: The maximum allowable power dissipation is a function of the maximum junction temperature, T
J(max)
, the junction-to-
ambient thermal resistance,
JA
, and the ambient temperature, T
A
. The maximum allowable power dissipation at any ambient
temperature is calculated using: P
D(max)
= (T
J(max)
T
A
)
JA
. Exceeding the maximum allowable power dissipation will result in
excessive die temperature, and regulator will go into thermal shutdown.
JA
of the SOT-353-5 is 450C/W, mounted on a PC board.
Note 5: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 6: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due
to heating effects are covered by the thermal regulation specification.
Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value
measured at 1Vdifferential.
Note 8: Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the
supply is the sum ofthe load current plus the ground pin current.
Note 9: Thermal regulation is defined as the change in output voltage at a time "t" after a change in power dissipation is applied,
excluding load or lineregulation effects. Specifications are for an 80mA load pulse at V
IN
= 16V for t = 10ms.
Revision 1, May 2002 www.gammamicro.com
80mA LOW-DROPOUT LINEAR VOLTAGE REGULATORS
GM6080
PRELIMINARY
4
APPLICATIONS INFORMATION
Input Capacitor
Place a 0.1
F capacitor from IN to GND in
applications where there is more than 10 inches of
wire between the input and the AC filter capacitor, or
where a battery is used as the input.
Output Capacitor
As with all PNP based regulators, the GM6080
requires an output capacitor to prevent oscillation.
However, the GM6080 is extremely stable, and
requires only 0.47
F of output capacitance for stability.
You can use any type of capacitor, but the GM6080
works great with cheap, tiny ceramic capacitors--why
spend more? You can increase output capacitor value
without limit to improve transient response.
Caveat: For best results use a capacitor with a
resonant frequency above 500kHz. Note that ceramic
capacitor work great with the GM6080, but some
ceramic capacitors have dielectrics with less-than-
ideal thermal coefficients; this will affect the
capacitance value over temperature. Tantalum
capacitors are very stable over temperature, but are
larger and cost a lot more. Aluminum electrolytics
work OK, but their electrolytes can freeze at ~ -30C.
Stick with Tantalums or ceramics for operation below
-25C.
No-Load Stability
Unlike many regulators, the GM6080 will remain
stable and in regulation with no load other than the
internal voltage divider. This makes the GM6080 ideal
for CMOS RAM keep-alive applications.
Enable Input
The GM6080 has off-mode current of practically zero.
When the enable input (EN) is held below 0.6V, all
internal circuitry is powered off. Pulling EN high (over
2.0V) turns on the GM6080. When EN is held low,
the regulator draws only 10nA (typical). Although the
logic threshold is TTL/CMOS compatible, EN may be
pulled as high as 20V, independent of V
IN
.
Thermal Behavior
The GM6080 is designed to provide 80mA of
continuous current despite the tiny SOT-363-5. You
can calculate maximum power dissipation 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 this simple equation:
The actual power dissipation of the regulator circuit
can be determined using one basic equation:
P
D
= (V
IN
V
OUT
) I
OUT
+ V
IN
x I
GND
Substituting P
D(max)
, determined above, for P
D
and
solving for the operating conditions that are critical to
your application will give you the maximum operating
conditions for the regulator circuit. For example, if
you are operating the GM6080-3.0 at room
temperature, with a minimum footprint layout, you can
determine the maximum input voltage for a set output
current.
P
D(max)
=
450C/W
125 - 25
; P
D(max)
= 222 mW
To prevent the device from going into thermal
shutdown, do not exceed the maximum power
dissipation. Using the output voltage of 3.0V, and an
output current of 80mA, you can determine the
maximum input voltage. Ground current, maximum
of 3mA for 80mA of output current, is found in the
"Electrical Characteristics" section of this data sheet.
222mW = (V
IN
3.0V) 80mA + V
IN
x 3mA
222mW = (80mA x V
IN
+ 3mA x V
IN
) - 240mW
462mW = 83mA x V
IN
V
IN
= 5.57V max.
Therefore, a 3.0V application at 80mA of output
current can accept a maximum input voltage of 5.6V
in an SOT-353-5 package.
Fixed-Voltage Regulator
The GM6080 is an ideal general-purpose voltage
regulator for any handheld device.
Where miniaturization is paramount, you can't beat
the GM6080 solution, with its microscopic SOT-353-
5 package (half the footprint of SOT-23-5) combined
with the tiny ceramic capacitors.
T
J(max)
is the maximum junction temperature of the
die, 125C, and T
A
is the maximum ambient
temperature.
JA
is the junction-to-ambient thermal
resistance ambient of the regulator. The
JA
of the
GM6080 is 450C/W.
P
D(max)
=
JA
T
J(max)
- T
A
Revision 1, May 2002 www.gammamicro.com
80mA LOW-DROPOUT LINEAR VOLTAGE REGULATORS
GM6080
PRELIMINARY
5
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SOT-353 PACKAGE OUTLINE DIMENSIONS
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