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Электронный компонент: GM66151-12TB5

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Revision 2, January 2003 1 www.gammamicro.com
1.5A LOW-DROPOUT VOLTAGE REGULATORS
GM66150
PRELIMINARY
Fixed and Adjustable Voltage Versions
Output Current up to 1.5A
Low Dropout Voltage 350mV @ 1.5A
Low Ground Current
Accurate 1% Guaranteed Tolerance
Extremely Fast Transient Response
Reverse-battery Protection
"Load Dump" Protection
The GM66150 series of positive fixed and adjustable
regulators are designed to provide up to 1.5A output with
high current, high accuracy and extremely low dropout
voltage performance. These regulators feature 300 to
350mV (full load) dropout voltages and very low ground
current. Although designed for high current loads, these
devices are also useful in lower current, extremely low
dropout-critical systems, where their minimal dropout
voltage and ground current values are important
characteristics.
The GM66150's are fully protected against overcurrent,
reversed input polarity (or reversed battery connection),
reversed lead insertion, over-temperature operation, and
transient voltage spikes (positive or negative).
The GM66150's are available in TO-220 and surface-mount
TO263 packages.
PIN CONFIGURATIONS
Applications:
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Battery Powered Equipment
High Efficiency "Green" Computer Systems
Automotive Electronics
3
2
1
TO-220 3-LEAD
GND
V
IN
V
OUT
GND
V
IN
TO-263 (D2PAK)
V
OUT
3
2
1
TYPICAL APPLICATION CIRCUITS
GM66150-3.3
5V5%
3.3V1%@1.5A
47
F
+
GND
EN
ADJ/FLAG
V
IN
V
OUT
TO-220 5-LEAD
5
4
3
2
1
TO-263 (5-LEAD)
EN
ADJ/FLAG
5
4
3
2
1
V
IN
V
OUT
GND
+
+
R1
R2
V
IN
V
OUT
V
OUT = 1.24V x [1 + (R1/R2)]
Figure 1. Fixed Voltage Version
Figure 2. Adjustable Voltage Version
Revision 2, January 2003 2 www.gammamicro.com
1.5A LOW-DROPOUT VOLTAGE REGULATORS
GM66150
PRELIMINARY
BLOCK DIAGRAM
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* Feedback network in fixed version only
** Adjustable version only
Revision 2, January 2003 3 www.gammamicro.com
1.5A LOW-DROPOUT VOLTAGE REGULATORS
GM66150
PRELIMINARY
Unless otherwise specified:
T
J
= 25
C; Bold values are guaranteed across the operating temperature range.
Adjustable versions are programmed to 5.0V.
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A
ELECTRICAL CHARACTERISTICS
Revision 2, January 2003 4 www.gammamicro.com
1.5A LOW-DROPOUT VOLTAGE REGULATORS
GM66150
PRELIMINARY
ELECTRICAL CHARACTERISTICS
(continued)
Notes:
Note 1: Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle (
1%).
The maximum continuous supply voltage is 26V.
Note 2: Full Load current (I
FL
) is defined as 1.5A for the GM66150 series.
Note 3: Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its
nominal value with V
OUT
+ 1V applied to V
IN
Note 4: V
IN
= V
OUT
(nominal) + 1V. For example, use V
IN
= 4.3V for a 3.3V regulator or use 6V for a 5V regulator.
Employ pulse-testing procedures to minimize temperature rise.
Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the
load current plus the ground pin current.
Note 6: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total
temperature range.
Note 7: 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 line regulation effects. Specifications are for a 200mA load pulse at V
IN
= 20V (a 4W pulse)
for T = 10ms.
Note 8: V
REF
V
OUT
(V
IN
1V), 2.3V
V
IN
26V, 10mA < I
L
I
FL
, T
J
T
J MAX
.
Note 9: Comparator thresholds are expressed in terms of a voltage differential at the Adjust terminal below the nominal
reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the
error amplifier gain = V
OUT
/V
REF
= (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output
is guaranteed to go low when the output drops by 95 mV x 5V/1.240 V = 384 mV. Thresholds remain constant as a
percent of V
OUT
as V
OUT
is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.
Note 10: V
EN
0.8V and V
IN
26V, V
OUT
= 0.
Note 11: When used in dual supply systems where the regulator load is returned to a negative supply, the output
voltage must be diode clamped to ground.
.
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G
5
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6
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2
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T
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B
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-
3
5
1
6
6
M
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-
-
-
-
ORDERING INFORMATION
Revision 2, January 2003 5 www.gammamicro.com
1.5A LOW-DROPOUT VOLTAGE REGULATORS
GM66150
PRELIMINARY
APPLICATIONS INFORMATION
The GM66150 series are high performance, low-
dropout voltage regulators suitable for all moderate
to high-current voltage regulator applications. Their
350mV dropout voltage at full load make them
especially valuable in battery powered systems and
as high efficiency noise filters in "post-regulator"
applications. Unlike older NPN-pass transistor
designs, where the minimum dropout voltage is limited
by the base-emitter voltage drop and collector-emitter
saturation voltage, dropout performance of the PNP
output of these devices is limited merely by the low
V
CE
saturation voltage. A trade-off for the low dropout
voltage is a varying base drive requirement.But
Gamma's PNP process reduces this drive requirement
to merely 1% of the load current.
The GM66150 series of regulators are fully protected
from damage due to fault conditions. Current limiting
is provided. This limiting is linear; output current under
overload conditions is constant.
Thermal shutdown disables the device when the die
temperature exceeds the 125
C maximum safe
operating temperature. Transient protection allows
device (and load) survival even when the input voltage
spikes between 20V and +60V. When the input
voltage exceeds about 35V to 40V, the overvoltage
sensor temporarily disables the regulator. The output
structure of these regulators allows voltages in excess
of the desired output voltage to be applied without
reverse current flow. GM66151 and GM66152
versions offer a logic level ON/OFF control: when
disabled, the devices draw nearly zero current.
+
+
GND
OUT
IN
V
IN
V
OUT
Figure 3. Linear regulators require only two
capacitors for operation.
Thermal Design
Linear regulators are simple to use. The most
complicated design parameters to consider are
thermal characteristics. Thermal design requires the
following application-specific parameters:
Maximum ambient temperature, T
A
Output Current, I
OUT
Output Voltage, V
OUT
Input Voltage, V
IN
First, we calculate the power dissipation of the
regulator from these numbers and the device
parameters from this formula:
P
D
= I
OUT
( 1.01V
IN
- V
OUT
)
where the ground current is approximated by 1% of
I
OUT
.
Then the heat sink thermal resistance is determined
with this formula:
SA
= (
JC
+
CS
)
T
J(MAX)
- T
A
P
D
where T
J(MAX)
125
C and
CS
is between 0 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
Gamma PNP regulators allow very significant
reductions in regulator power dissipation and the
associated heat sink without compromising
performance. When this technique is employed, a
capacitor of at least 0.1
F is needed directly between
the input and regulator ground.
An additional feature of this regulator family is a
common pinout: a design's current requirement may
change up or down yet use the same board layout,
as all of these regulators have identical pinouts.