MIC29150/1/2
Low-Dropout Regulators
General Description
The MIC2915X(-XX) are high-current, high-accuracy, low-
dropout voltage regulators. Using the process with a PNP
pass element, these regulators feature 350mV (full load)
dropout voltages and very low ground current. These devices
also find applications in lower current, low-dropout critical
systems, where their tiny dropout voltage and ground current
values are important attributes.
The MIC2915X(-XX) are fully protected against overcurrent
faults, reversed input polarity, reversed lead insertion, over
temperature operation, positive and negative transient
voltage spikes. Five-pin fixed voltage versions feature a logic
level ON/OFF control and an error flag, which signals
whenever the output falls out of regulation.
On the MIC29151(-XX) and MIC29152 the EN (Enable) pin
may be tied to V
IN
, if it is not required for the ON/OFF control.
The MIC2915X(-XX) are available in 3- and 5-pin TO-220, TO-
263 and TO-252 packages.
The Output Voltage, (-XX), may be 1.5V, 1.8V, 2.5V, 2.85V,
3V, 3.3V, 5V, 8V, 9V, 12V.
Features
• High-current capability.........................1.5A
• Low dropout voltage ...........................350mV
• Low ground current
• 1% initial accuracy
• Extremely fast transient response
• Reverse-battery and “load dump” protection
• Zero-current shutdown mode (5-pin versions)
• Error flag signals Output Out-of-Regulation (5-Pin versions)
• Fixed voltage and adjustable versions
Applications
•
•
•
•
•
Battery-powered equipment
High-efficiency “green” computer systems
Automotive electronics
High-efficiency linear power supplies
High-efficiency post-regulator for switching supply
PIN Configuration
TO220-3
MIC29150-XX
TO263-3
MIC29150-XX
TO220-5
MIC29151-XX
MIC29152
TO263-5
MIC29151-XX
MIC29152
Pinout
On all the devices, the Tab is grounded.
MIC29150-XX,
three-terminal devices:
Pin 1 = IN (Input), 2 = GND (Ground), 3 = OUT (Output)
MIC29151-XX,
five-terminal fixed voltage devices
Pin 1 = EN (Enable), 2 = IN (Input), 3 = GND (Ground), 4 = OUT (Output), 5 = FLAG (Flag)
MIC29152 ,
adjustable version with ON/OFF control
Pin 1 = EN (Enable), 2 = IN (Input), 3 = GND (Ground), 4 = OUT (Output), 5 = ADJ (Adjust)
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MIC29150/1/2
Absolute Maximum Ratings
Power Dissipation
internally-limited
o
Lead Temperature (soldering, 5 seconds)
260 C
o
o
Storage Temperature Range
–65 C to +150 C
Input Supply Voltage
–20V to +30V
Operating Ratings
Operating Junction Temperature
Operating Input Voltage
–40 C to +125 C
2.3V to 26V
o
o
Electrical Characteristics
All measurements at T
J
=25 C, I
O
=10mA, V
IN
=V
OUT
+1V, unless otherwise noted.
Bold
values are guaranteed across the
operating temperature range. Adjustable versions are programmed to 5.0V.
Parameter
Output Voltage
Line Regulation
Load Regulation
Vo
T
Dropout Voltage
Conditions
I
O
=10mA
10mA I
O
1.5A, (V
OUT
+1V) V
IN
26V
I
O
=10mA, (V
OUT
+1V) V
IN
26V
V
IN
=V
OUT
+5V, 10mA I
OUT
1.5A (
Note 1
)
Output Voltage Temperature Coefficient
(
Note 2
)
V
OUT
=-1%, (
Note 1, 3
)
I
O
=100mA
I
O
=750mA
I
O
=1.5A
(Note 1, 4
)
I
O
=750mA,
V
IN
=V
OUT
+1V
I
O
=1.5A
V
IN
=0.5V less than specified V
OUT,
I
OUT
=10mA
(Note 5)
MIC29150
V
OUT
=0V
(Note 1)
Min
-1
-2
Typ
Max
1
2
0.5
1
100
Units
%
%
%
%
o
ppm/ C
o
0.06
0.2
20
Ground Current
100
250
350
8
22
2
2.1
1.228
1.215
1.203
1.240
200
600
20
mV
mA
I
GNDDO
,
GND Pin Current at Dropout
Current Limit
Reference, MIC29152
Reference Voltage
Reference Voltage
ADJ Pin Bias Current
mA
3.5
1.252
1.265
1.277
80
120
A
V
V
nA
ppm/ C
nA/ C
O
O
(Note 6)
20
20
0.1
(Note 2)
Reference Voltage
Temperature Coefficient
ADJ Pin Bias Current
Temperature Coefficient
Flag Output (Error Comparator), MIC29151-XX
Output Leakage Current
V
OH
=26V
0.01
220
Output Low Voltage
V
IN
=0.5V less than specified V
OUT,
I
OL
=250 A
(Note 5)
(Note 5)
(Note 5)
(Note 5)
1.00
2.00
300
400
99.2
A
mV
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
EN Input, MIC29151-XX, MIC29152
Input Logic Voltage
Low (OFF)
High (ON)
EN Pin Input Current
V
EN
=26V
V
EN
=0.8V
Regulator Output Current
Shutdown
(Note 7)
93
1
% of V
OUT
% of V
OUT
% of V
OUT
0.8
2.4
30
600
750
2.5
5
500
V
A
A
A
10
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MIC29150/1/2
Notes:
Note 1: Employ pulse-testing procedures to minimize temperature rise.
Note 2: Output Voltage temperature coefficient is defined as the worst case voltage change divided by the total
temperature range.
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.
For Output Voltages below 2.3V the Dropout Voltage is the input-to-output voltage
differential with the minimum input voltage being 2.3V. The minimum input operation voltage is 2.3V.
Note 4: GND pin current is the regulator quiescent current. The total current drawn from the source is a sum of the load
current plus the GND pin current.
Note 5: For specified V
OUT
≥2.5V.
Note 6: V
REF
V
OUT
(V
IN
-1V), 2.3V V
IN
26V, 10mA I
L
1.5A, T
J
T
J
MAX.
Note 7: V
EN
0.8V and V
IN
26V, V
OUT
=0
Note 8: 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.
Block Diagram
IN
OUT
FLAG
R1*
EN
R2*
ADJ**
GND
*Feedback network in fixed versions only.
**Adjustable version only.
MIC29152
Typical Applications
5V
5%
MIC29151-3.3
3.3V
+
47F
1% @1.5A
V
IN
R1
R2
+
V
OUT
Fig.1. Fixed output voltage
V
OUT
=1.240V x [1+(R1/ R2)]
Fig.2. Adjustable output voltage configuration. For best
results, the total series resistance should be small
enough to pass the minimum regulator load current
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MIC29150/1/2
Application information
The MIC2915X(-XX) are high performance low-dropout
voltage regulators suitable for all moderate to high-current
voltage regulator applications. Their 350mV dropout voltage
at full load makes them especially valuable in battery-
powered systems and as high-efficiency noise filters in post-
regulator applications. Unlike older NPN-pass transistor
designs, dropout performance of the PNP output of these
devices is limited merely by the low V
CE
saturation voltage.
The MIC2915X (-XX) family of regulators is fully protected
from the 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
o
when the die temperature exceeds the 125 C maximum safe
operating temperature. The Transients protection allows the
device survival even when the input voltage spikes between
–20V and +30V. When the input voltage exceeds about 28V
to 33V, the overvoltage sensor temporarily disables the
regulator.
Minimum Load Current
The MIC29150 regulators are specified between finite loads. If
the output current is too small, leakage currents dominate
and the output voltage rises. The 5mA minimum load current
swamps any expected leakage current across the operating
temperature range.
V
IN
R1
R2
V
OUT
+
IN OUT
V
IN
+
GND
V
+
OUT
V
OUT
= 1.240V x [1 + (R1/R2)]
Fig.4. Adjustable Regulator with Resistors
Fig.3. Linear regulators require only two capacitors for
operation.
Adjustable Regulator Design
The adjustable regulator version, MIC29152 , allows one to
program the output voltage anywhere between 1.25V and
26V (maximum operating rating of the family). Two resistors
are used. Resistors can be quite large, up to 1M , because
of the very high input impedance and low bias current of the
sense comparator: The resistor values are calculated by:
R
1
=R
2
(V
OUT
– 1),
1.240
where V
OUT
is the desired output voltage. Figure 4 shows
component definition. Applications with widely varying load
currents may scale the resistors to draw the minimum load
current required for proper operation.
Thermal Design
The 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
datasheet.
.
where the ground current is approximated by 1% of I
OUT
Then the heat sink thermal resistance is determined with this
formula:
SA
=
P
D
=I
OUT
(1.01V
IN
-V
OUT
),
Error Flag
The MIC29151-XX version feature s an Error Flag, which looks
at the output voltage and signals an error condition when this
voltage drops 5% below its expected value. The error flag is
an open-collector output that pulls low under fault conditions.
It may sink 10mA. Low output voltage signifies a number of
possible problems, including an overcurrent fault (the device
is in current limit) and a low input voltage. The flag output is
inoperative during overtemperature shutdown conditions.
T
J MAX
-T
A
P
D
-(
O
JC
+
CS
),
O
where T
J MAX
125 C and
CS
is between 0 and 2 C/W.
Capacitor Requirements
For stability and minimum output noise, a capacitor on the
regulator output is necessary. The value of this capacitor is
dependent upon the output current; lower currents allow
smaller capacitors. MIC2915X(-XX) regulators are stable with
the 10 F minimum capacitor values at a full load.
Where the regulator is powered from a source with a high AC
impedance, a 0.1 F capacitor connected between Input and
GND is recommended. This capacitor should have good
characteristics to above 250kHz.
Enable Input
MIC29151-XX and MIC29152 versions feature an enable (EN)
input that allows ON/OFF control of the device. A special
design allows “zero” current drain when the device is
disabled - only microamperes of leakage current flow. The
EN input has TTL/CMOS compatible thresholds for simple
interfacing with logic, or may be directly tied to
30V.
Enabling the regulator requires approximately 20 A of
current.
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MIC29150/1/2
Important statement:
Huaguan Semiconductor Co,Ltd. reserves the right to change
the products and services provided without notice. Customers
should obtain the latest relevant information before ordering,
and verify the timeliness and accuracy of this information.
Customers are responsible for complying with safety
standards and taking safety measures when using our
products for system design and machine manufacturing to
avoid potential risks that may result in personal injury or
property damage.
Our products are not licensed for applications in life support,
military, aerospace, etc., so we do not bear the consequences
of the application of these products in these fields.
Our documentation is only permitted to be copied without
any tampering with the content, so we do not accept any
responsibility or liability for the altered documents.
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