MIC37302BR [MICREL]
3.0A, LOW VOLTAGE UCAP LDO REGULATOR; 3.0A ，工作电压低UCAP LDO稳压器
| 型号： | MIC37302BR |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 3.0A, LOW VOLTAGE UCAP LDO REGULATOR |
| 文件： | 总12页 (文件大小：164K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC37300/37301/37302
3.0A, Low-Voltage µCap LDO Regulator
General Description
Features
The Micrel MIC37300/01/02 is a 3.0A low-dropout linear
voltage regulator that provides a low-voltage, high-current
output with a minimum number of external components. It
offers high precision, ultra-low-dropout (500mV overtem-
perature), and low-ground current.
• 3.0A minimum guaranteed output current
• 500mV maximum dropout-voltage overtemperature
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V, 1.65V, or 1.5V conversion
• Stable with ceramic or tantalum capacitor
• Wide input voltage range:
The MIC37300/01/02 operates from an input of 2.25V to
6.0V. It is designed to drive digital circuits requiring low-
voltage at high currents (i.e., PLDs, DSP, microcontroller,
etc.). It is available in fixed and adjustable output voltages.
Fixed voltages include 1.5V, 1.8V, 2.5V and 3.3V. The
adjustable version is capable of 1.24V to 5.5V.
V : 2.25V to 6.0V
IN
• +1.0% initial output tolerance
• Fixed and adjustable output voltages:
MIC37300 — 3-pin fixed
MIC37301 — 5-pin fixed with flag
MIC37302 — 5-pin adjustable
• Excellent line and load regulation specifications
• Logic controlled shutdown
• Thermal shutdown and current-limit protection
• Reverse-leakage protection
• Low profile S-Pak package
Features of the MIC37300/01/02 LDO include thermal and
current-limitprotection,andreverse-currentprotection.Logic
enable and error flag pins are available on the 5-pin version.
Junction temperature range of the MIC37300/01/02 is from
–40°C to 125°C.
For applications requiring input voltage greater than 6.0V,
see the MIC3910x, MIC3915x, MIC3930x, and MIC3950x
LDOs.
Applications
• LDO linear regulator for low-voltage digital IC
• PC add-in cards
• High-efficiency linear power supplies
• SMPS post regulator
All data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
• Battery charger
Typical Application
MIC37302
VIN
1.3V
MIC37300
VIN
VOUT
VIN = 3.0V
VOUT = 2.5V
VIN
VOUT
R1
R2
CIN
COUT
47µF, Ceramic
COUT
47µF, Ceramic
VEN
ADJ
GND
GND
Fixed 2.5V Regulator
Adjustable Regulator
MIC37301
VIN = 3.0V
CIN
VOUT = 2.5V
Dropout vs.
Output Current
VIN
VOUT
500
100k
COUT
47µF, Ceramic
450
400
350
300
250
200
150
100
50
VEN
FLG
GND
2.5VOUT
3.3VOUT
Fixed 2.5V Regulator with Error Flag
0
0
0.5
1
1.5
2
2.5
3
OUTPUT CURRENT (A)
Super ßeta PNP is a registered trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
November 2003
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M0307-112003
MIC37300/37301/37302
Micrel
Ordering Information
Output
Part Number
Current
Voltage*
1.5V
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
S-Pak-3
S-Pak-3
S-Pak-3
S-Pak-3
S-Pak-3
S-Pak-5
S-Pak-5
S-Pak-5
S-Pak-5
S-Pak-5
TO-263-5
MIC37300-1.5BR
MIC37300-1.65BR
MIC37300-1.8BR
MIC37300-2.5BR
MIC37300-3.3BR
MIC37301-1.5BR
MIC37301-1.8BR
MIC37301-2.5BR
MIC37301-3.3BR
MIC37302BR
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
1.65V
1.8V
2.5V
3.3V
1.5V
1.8V
2.5V
3.3V
ADJ.
ADJ.
MIC37302BU
*For other voltages contact Micrel.
Pin Configuration
5
4
3
2
1
FLG/ADJ
VOUT
GND
VIN
3
VOUT
GND
VIN
2
1
EN
S-PAK-5 (R)
TO-263-5 (U)
S-PAK-3 (R)
Pin Description
Pin Number
TO-263-5
S-PAK-5
Pin Number
S-PAK-3
Pin Name
Pin Function
1
EN
Enable (Input): CMOS compatible input. Logic high = enable, logic
low = shutdown.
2
3
4
5
1
2
3
VIN
GND
VOUT
FLG
Input voltage which supplies current to the output power device.
Ground: TAB is connected to ground.
Regulator Output.
Error Flag (Output): Open collector output. Active-low indicates an output
fault condition.
ADJ
Adjustable Regulator Feedback Input: Connect to resistor voltage divider.
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November 2003
MIC37300/37301/37302
Micrel
Absolute Maximum Rating(1)
Operating Maximum Rating(2)
Supply Voltage (V ) ....................................................6.5V
Supply Voltage (V ) ..................................... 2.25V to 6.0V
IN
IN
(3)
Enable Input Voltage (V
)
................................................ 6.5V
Enable Input Voltage (V ) ................................ 0V to 6.0V
EN
(3)
EN
Power Dissipation (P ) ............................... Internally Limited
Junction Temperature Range (T ) .....–40°C ≤ T ≤ +125°C
D
J
J
Junction Temperature (T ) .................–40°C ≤ T ≤ +125°C
Package Thermal Resistance
J
J
Storage Temperature (T ) .................–65°C ≤ T ≤ +150°C
S-Pak (θ )........................................................2°C/W
S
J
JC
TO-263-5 (θ ) ..................................................2°C/W
Lead Temperature (soldering, 5 sec.) ....................... 260°C
JC
(4)
ESD
Electrical Characteristics(5)
TA = 25°C with VIN = VOUT + 1V; VEN = VIN; IL = 10mA; bold values indicate –40°C < TJ < +125°C; unless otherwise noted.
Parameter
Condition
Min
–1
Typ
Max
+1
Units
%
Output Voltage Accuracy
IL = 10mA
10mA < IOUT < IL(max), VOUT + 1 ≤ VIN ≤ 6V
–2
+2
%
Output Voltage Line Regulation
Output Voltage Load Regulation
VIN – VOUT; Dropout Voltage(6)
VIN = VOUT +1.0V to 6.0V, IL = 10mA
0.02
0.2
0.5
1
%
IL = 10mA to 3A
IL = 1.5A
IL = 3A
%
175
310
27
350
500
mV
mV
Ground Pin Current(7)
IL = 3A
40
50
mA
mA
Ground Pin Current in Shutdown
Current Limit
VIL < 0.5V, VIN = VOUT + 1V
VOUT = 0
1.0
4.75
170
5
µA
A
6.5
500
Start-up Time
VEN = VIN, IOUT = 10mA, COUT = 47µF
µs
Enable Input
Enable Input Threshold
Regulator enable
2.25
V
V
Regulator shutdown
0.8
Enable Pin Input Current
VIL < 0.8V (Regulator shutdown)
2
4
µA
µA
VIH > 2.25V (Regulator enabled)
1
15
30
75
µA
µA
Flag Output
IFLG(LEAK)
VOH = 6V
1
2
µA
µA
VFLG(LO)
VFLG
VIN = 2.25V, IOL = 250µA(8)
210
2
400
500
mV
mV
Low Threshold, % of VOUT below nominal
Hysteresis
93
%
%
%
High Threshold, % of VOUT below nominal
99.2
MIC37302 Only
Reference Voltage
1.228
1.215
1.240
40
1.252
1.265
V
V
Adjust Pin Bias Current
80
120
nA
nA
Notes:
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. P (max) = (T (max) – T ) / θ , where θ , depends upon the printed circuit layout. See “Applications Information.”
D
J
A
JA
JA
4. Device is ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
November 2003
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M0307-112003
MIC37300/37301/37302
Micrel
Notes:
6.
V
= V – V
when V
decreased to 98% of its nominal output voltage with V = V
+1V. For output voltages below 1.75V, dropout
DO
IN
OUT
OUT
IN
OUT
voltage specification does not apply due to a minimum input operating voltage of 2.25V.
7.
I
is the quiescent current. I = I + I
.
OUT
GND
IN
GND
8. For a 2.5V device, V = 2.250V (device is in dropout).
IN
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November 2003
MIC37300/37301/37302
Micrel
Typical Characteristics
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
Dropout vs.
Output Current
500
450
400
350
300
250
200
150
100
50
80
80
70
60
50
40
30
20
10
0
VIN = 2.5V
VOUT = 1.5V
VIN = 2.5V
VOUT = 1.5V
70
60
50
40
30
2.5VOUT
IOUT = 3A
COUT = 47µF
CIN = 0
IOUT = 3A
COUT = 100µF
CIN = 0
3.3VOUT
20
10
0
0
0
0.5
1
1.5
2
2.5
3
0.01 0.1
1
10
100 1000
0.01 0.1
1
10
100 1000
OUTPUT CURRENT (A)
FREQUENCY (kHz)
FREQUENCY (kHz)
Dropout Characteristics
(1.5V)
Dropout vs.
Temperature
Dropout Characteristics
(2.5V)
450
400
350
300
250
200
150
100
50
1.6
1.4
1.2
1
3
10mA Load
10mA Load
2.5
2
2.5VOUT
0.8
0.6
0.4
0.2
0
1.5
1
3A Load
0.5
3A Load
1.9 2.1
0
0
1.5
1.7
2.3
2.5
-40 -20
0
20 40 60 80 100 120
1.5
2
2.5
3
3.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Ground Current
vs. Output Current
Dropout Characteristics
(3.3V)
Ground Current
vs. Supply Voltage (1.5V)
50
45
40
35
30
25
20
15
10
5
0.0006
0.0005
0.0004
0.0003
0.0002
0.0001
0
3.5
3
10mA Load
100mA
2.5
2
3A Load
1.5
1
10mA
0.5
0
0
0
1
2
3
4
5
1.5
2
2.5
3
3.5
4
0
0.5
1
1.5
2
2.5
3
SUPPLY VOLTAGE (V)
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Ground Current
vs. Supply Voltage (2.5V)
Ground Current
vs. Supply Voltage (2.5V)
Ground Current
vs. Supply Voltage (1.5V)
1.4
1.2
1
70
60
50
40
30
20
10
0
40
35
30
25
20
15
10
5
3A
0.8
0.6
0.4
0.2
0
100mA
10mA
3A
2A
2A
1A
1A
0
0
1
2
3
4
5
0
1
2
3
4
5
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
November 2003
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M0307-112003
MIC37300/37301/37302
Micrel
Ground Current
vs. Temperature
Ground Current
Ground Current
vs. Supply Voltage (3.3V)
vs. Supply Voltage (3.3V)
0.4
0.35
0.3
1.4
1.2
1
70
60
50
40
30
20
10
0
2.5V
OUT
3A
0.25
0.2
0.8
0.6
0.4
0.2
0
100mA
0.15
0.1
2A
1A
0.05
0
I
=10mA
10mA
OUT
0
1
2
3
4
5
0
1
2
3
4
5
-40 -20
0
20 40 60 80 100 120
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Ground Current
vs. Temperature
Ground Current
vs. Temperature
Output Voltage
vs. Temperature
45
14
12
10
8
2.6
40
35
30
25
20
15
10
5
2.5V
OUT
2.55
2.5
2.5V
OUT
2.5V
OUT
6
4
2.45
2.4
2
I
=3A
0
I
=1.5A
OUT
OUT
0
0
-40 -20
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
Short-Circuit Current
vs. Supply Voltage
Short-Circuit Current
vs. Temperature
Flag Voltage
vs. Flag Current
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
6
5
4
3
2
1
0
1.0
5V
IN
0.8
0.6
0.4
0.2
0
2.5VIN
3.3V
IN
2.5V
IN
2.25
3
3.75 4.5 5.25
6
-40 -20
0
20 40 60 80 100 120
0
0.5 1 1.5 2 2.5 3 3.5 4
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
FLAG CURRENT (mA)
Flag Low Voltage
vs. Temperature
Enable Current
vs. Temperature
Error Flag Pull-Up Resistor
400
350
300
250
200
150
100
50
16
14
12
10
8
6
5
4
3
2
1
0
Flag High (OK)
6
2.5VEN
Flag Low (FAULT)
VIN = 5V
4
2
Flag Current=250µA
0
0
0.01 0.1
1
10 100 1000 10000
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
RESISTANCE (kΩ)
TEMPERATURE (°C)
TEMPERATURE (°C)
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November 2003
MIC37300/37301/37302
Micrel
Functional Characteristics
µ
µ
µ
µ
µ
µ
November 2003
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M0307-112003
MIC37300/37301/37302
Micrel
Output Capacitor
Applications Information
The MIC37300/01/02 requires an output capacitor for stable
operation. As a µCap LDO, the MIC37300/01/02 can operate
with ceramic output capacitors as long as the amount of
capacitance is 47µF or greater. For values of output capaci-
tance lower than 47µF, the recommended ESR range is
200mΩ to 2Ω. The minimum value of output capacitance
recommended for the MIC37300 is 10µF.
The MIC37300/01/02 is a high-performance low-dropout
voltage regulator suitable for moderate to high-current regu-
lator applications. Its 500mV dropout voltage at full load and
overtemperature makes it especially valuable in battery-
powered systems and as high-efficiency noise filters in post-
regulator applications. Unlike older NPN-pass transistor de-
signs, there the minimum dropout voltage is limited by the
based-to-emitter voltage drop and collector-to-emitter satu-
ration voltage, dropout performance of the PNP output of
For 47µF or greater, the ESR range recommended is less
than 1Ω. Ultra-low ESR, ceramic capacitors are recom-
mended for output capacitance of 47µF or greater to help
improve transient response and noise reduction at high
frequency. X7R/X5R dielectric-type ceramic capacitors are
recommended because of their temperature performance.
X7R-type capacitors change capacitance by 15% over their
operating temperature range and are the most stable type of
ceramiccapacitors.Z5UandY5Vdielectriccapacitorschange
value by as much as 50% and 60%, respectively, over their
operatingtemperatureranges. Touseaceramicchipcapaci-
torwithY5Vdielectric, thevaluemustbemuchhigherthanan
X7R ceramic capacitor to ensure the same minimum capaci-
tance over the equivalent operating temperature range.
these devices is limited only by the low V
voltage.
saturation
CE
A trade-off for the low dropout voltage is a varying base drive
requirement. Micrel’sSuperßetaPNP processreducesthis
drive requirement to only 2% to 5% of the load current.
The MIC37300/01/02 regulator is fully protected from dam-
age 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 tem-
perature. The output structure of these regulators allows
voltages in excess of the desired output voltage to be applied
without reverse current flow.
Input Capacitor
An input capacitor of 1.0µF or greater is recommended when
the device is more than 4 inches away from the bulk supply
capacitance, or when the supply is a battery. Small, surface-
mount chip capacitors can be used for the bypassing. The
capacitor should be place within 1" of the device for optimal
performance. Larger values will help to improve ripple rejec-
tion by bypassing the input to the regulator, further improving
the integrity of the output voltage.
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
Transient Response and 3.3V to 2.5V, 2.5V to 1.8V or
1.65V, or 2.5V to 1.5V Conversions
• Output voltage (V
)
)
OUT
• Input voltage (V )
IN
The MIC37300/01/02 has excellent transient response to
variations in input voltage and load current. The device has
been designed to respond quickly to load current variations
and input voltage variations. Large output capacitors are not
required to obtain this performance. A standard 47µF output
capacitor, preferably tantalum, is all that is required. Larger
values help to improve performance even further.
• Ground current (I
GND
First, calculate the power dissipation of the regulator from
thesenumbersandthedeviceparametersfromthisdatasheet.
P = (V – V
) I
+ V I
IN GND
D
IN
OUT OUT
where the ground current is approximated by using numbers
from the “Electrical Characteristics” or “Typical Characteris-
tics.” Then the heat sink thermal resistance is determined
with this formula:
By virtue of its low-dropout voltage, this device does not
saturate into dropout as readily as similar NPN-based
designs. When converting from 3.3V to 2.5V, 2.5V to 1.8V or
1.65V,or2.5Vto1.5V,theNPN-basedregulatorsarealready
operating in dropout, with typical dropout requirements of
1.2V or greater. To convert down to 2.5V without operating in
dropout, NPN-based regulators require an input voltage of
3.7V at the very least. The MIC37300/01/02 regulator will
provideexcellentperformancewithaninputaslowas3.0Vor
2.25V, respectively. This gives the PNP-based regulators a
distinct advantage over older, NPN-based linear regulators.
θ
(T (max) – T )/ P
θ
+ θ
JC CS
= (
D) – (
)
SA
J
A
Where T (max) < 125°C and θ is between 0°C and 2°C/W.
J
CS
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 Micrel’s Super ßeta 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.
Referto “ApplicationNote9” forfurtherdetailsandexamples
on thermal design and heat sink applications.
M0307-112003
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November 2003
MIC37300/37301/37302
Micrel
Minimum Load Current
Adjustable Regulator Design
The MIC37300/01/02 regulator is specified between finite
loads. If the output current is too small, leakage currents
dominateandtheoutputvoltagerises.A10mAminimumload
current is necessary for proper operation.
MIC37302
VIN
IN
OUT
VOUT
COUT
R1
R2
ENABLE
SHUTDOWN
EN
ADJ
Error Flag
GND
The MIC37301 features an error flag circuit that monitors the
output voltage and signals an error condition when the
voltageis5%belowthenominaloutputvoltage.Theerrorflag
is an open-collector output that can sink 10mA during a fault
condition.
R1
R2
V
= 1.240V 1+
OUT
Figure 2. Adjustable Regulator with Resistors
The MIC37302 allows programming the output voltage any-
where between 1.24V and the 5.5V maximum operating
rating of the family. Two resistors are used. Resistors can be
quite large, up to 1MΩ, because of the very high input
impedance and low bias current of the sense comparator.
The resistor values are calculated by:
Low output voltage can be caused by a number of problems,
including an overcurrent fault (device in current limit) or low
input voltage. The flag is inoperative during overtemperature
shutdown.
Enable Input
TheMIC37301/37302alsofeaturesanenableinputforon/off
control of the device. Its shutdown state draws “zero” current
(only microamperes of leakage). The enable input is TTL/
CMOS compatible for simple logic interface, but can be
VOUT
R1= R2
−1
1.240
Where V
is the desired output voltage. Figure 2 shows
OUT
connected up to V . When enabled, it draws approximately
IN
component definition. Applications with widely varying load
currents may scale the resistors to draw the minimum load
current required for proper operation (see above).
15µA.
November 2003
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M0307-112003
MIC37300/37301/37302
Micrel
Package Information
0.405±0.005
0.176 ±0.005
0.060 ±0.005
0.050±0.005
0.360±0.005
0.065 ±0.010
20°±2°
0.600±0.025
SEATING PLANE
+0.004
0.004
–0.008
0.100±0.01
8° MAX
0.067±0.005
0.032 ±0.003
0.015 ±0.002
DIM. = INCH
5-Lead TO-263-5 (U)
DIMENSIONS:
INCH (MM)
0.375 (9.52)
0.365 (9.27)
0.360 (9.14)
0.350 (8.89)
0.080 (2.03)
0.070 (1.78)
0.050 (1.27)
0.030 (0.76)
0.256 BSC
(6.50 BSC)
0.010 BSC
(0.25 BSC)
0.316 BSC
(8.03 BSC)
0.045 (1.14)
0.035 (0.89)
0.320 (8.13)
0.310 (7.87)
0.420 (10.67)
0.410 (10.41)
0.031 (0.79)
0.025 (0.63)
0.067 BSC
(1.70 BSC)
0.005 (0.13)
0.001 (0.03)
0.080 (2.03)
0.070 (1.78)
0.031 (0.89)
0.041 (1.14)
0.010 BSC
(0.25 BSC)
6¡
0¡
5-Lead S-PAK (R)
M0307-112003
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November 2003
MIC37300/37301/37302
Micrel
0.375 (9.52)
0.365 (9.27)
0.360 (9.14)
0.350 (8.89)
0.008 (0.20)
0.004 (0.10)
0.050 (1.27)
0.030 (0.76)
0.256 BSC
(6.50 BSC)
0.010 BSC
(0.25 BSC)
0.316 BSC
(8.03 BSC)
0.035 (0.89)
0.045 (1.14)
0.320 (8.13)
0.310 (7.87)
0.420 (0.20)
0.410 (0.10)
0.031 (0.79)
0.025 (0.63)
0.100 BSC
(2.54 BSC)
"A"
DETAIL "A"
0.420 (0.20)
0.410 (0.10)
0.080 (2.03)
0.070 (1.78)
0.041 (1.04)
0.031 (0.79)
0.010 BSC
(0.25 BSC)
0.041 (1.04)
0.031 (0.79)
6¡
0¡
3-Lead S-PAK (R)
November 2003
11
M0307-112003
MIC37300/37301/37302
Micrel
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2003 Micrel, Incorporated.
M0307-112003
12
November 2003
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