MIC37150-3.3BR [MICREL]
1.5 A LOW VOLTAGE UCAP LDO REGULATOR; 1.5低电压UCAP LDO稳压器
| 型号： | MIC37150-3.3BR |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 1.5 A LOW VOLTAGE UCAP LDO REGULATOR |
| 文件： | 总10页 (文件大小：148K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC37150/37151/37152
1.5A, Low Voltage µCap LDO Regulator
General Description
Features
The Micrel MIC37150/51/52 is a 1.5A low-dropout linear
voltage regulator that provides a low voltage, high current
output with a minimum of external components. It offers high
precision, ultra-low dropout (500mV over temperature), and
low ground current.
• 1.5A minimum guaranteed output current
• 500mV maximum dropout voltage over temperature
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 MIC37150/51/52 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, DSPs, microcontrollers,
etc.). It is available in fixed and adjustable output voltages.
Fixedvoltagesinclude1.5V, 1.65V, 1.8V, 2.5Vand3.3V. The
adjustable version is capable of supplying output voltages
from 1.24V to 5.5V.
V : 2.25V to 6.0V
IN
• +1.0% initial output tolerance
• Fixed and adjustable output voltages
MIC37150—3-pin fixed voltages
MIC37151—5-pin fixed voltages
MIC37152—5-pin adjustable voltage
• Excellent line and load regulation specifications
• Logic controlled shutdown
• Thermal shutdown and current limit protection
• Reverse-leakage protection
Features of the MIC37150/51/52 LDO include thermal and
current limit protection, and reverse current and reverse
battery protection. Logic enable and error flag pins are
available.
• Low profile S-Pak 3 or 5 pin packages
Junction temperature range of the MIC37150/51/52 is from
–40°C to 125°C.
Applications
• LDO linear regulator for low-voltage digital IC
• PC add-in cards
• High efficiency linear power supplies
• SMPS post regulator
For applications requiring input voltage greater than 6.0V,
seeMIC3910x, MIC3915x, MIC3930x, andMIC3950xLDOs.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
• Battery charger
Typical Application
MIC37151
VIN = 3.0V
VOUT = 2.5V
VIN
VOUT
CIN
100k
COUT
47µF, Ceramic
VEN
FLG
GND
Fixed 2.5V Regulator with Error Flag
MIC37152
VIN
1.3V
VIN
VOUT
R1
R2
CIN
COUT
47µF, Ceramic
VEN
ADJ
GND
Adjustable Regulator
Super ßeta PNP is a 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
August 2003
1
MIC37150/37151/37152
MIC37150/37151/37152
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
S-Pak-5
MIC37150-1.5BR
MIC37150-1.65BR
MIC37150-1.8BR
MIC37150-2.5BR
MIC37150-3.3BR
MIC37151-1.5BR
MIC37151-1.65BR
MIC37151-1.8BR
MIC37151-2.5BR
MIC37151-3.3BR
MIC37152BR
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.65V
1.8V
2.5V
3.3V
1.5V
1.65V
1.8V
2.5V
3.3V
ADJ.
*For other voltages contact Micrel.
Pin Configuration
5
4
3
2
1
FLG/ADJ
VOUT
GND
VIN
3
2
1
OUT
GND
IN
EN
S-PAK-3 (R)
MIC37150
S-PAK-5 (R)
MIC37151
MIC37152
Pin Description
Pin Number
MIC37150
S-PAK-3
Pin Number
MIC37151/2
S-PAK-5
Pin Name
Pin Function
–
1
EN
Enable (Input): CMOS compatible input. Logic high = enable, logic
low = shutdown.
1
2
3
–
2
3
4
5
VIN
GND
VOUT
Input voltage which supplies current to the output power device.
Ground (TAB is connected to ground on S-Pak)
Regulator Output
FLG
MIC37151 only
Error Flag (Output): Open collector output. Active low indicates an output
fault condition.
ADJ
Adjustable regulator feedback input. Connect to resistor voltage divider.
MIC37152 only
MIC37150/37151/37152
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August 2003
MIC37150/37151/37152
Micrel
Absolute Maximum Rating (Note 1)
Operating Maximum Rating (Note 2)
Supply Voltage (V ) ....................................................6.5V
Supply Voltage (V ) ..................................... 2.25V to 6.0V
IN
IN
Enable Input Voltage (V ) ..........................................6.5V
Enable Input Voltage (V ) ................................ 0V to 6.0V
EN
EN
Power Dissipation .................................... Internally Limited
Junction Temperature Range.............–40°C ≤ T ≤ +125°C
J
Junction Temperature ........................–40°C ≤ T ≤ +125°C
Maximum Power Dissipation .................................... Note 4
J
Storage Temperature .........................–65°C ≤ T ≤ +150°C
Package Thermal Resistance
J
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD, Note 3
S-Pak(θ ).........................................................2°C/W
JC
Electrical Characteristics (Note 5)
TA = 25°C with VIN = VOUT + 1V; VEN = VIN; 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
VIN = VOUT +1.0V to 6.0V
IL = 10mA to 1.5A
IL = 750mA
–2
+2
%
Output Voltage Line Regulation
Output Voltage Load Regulation
VIN – VOUT; Dropout Voltage;
Note 6
0.06
0.2
0.5
1
%
%
350
500
30
mV
mV
mA
µA
A
IL = 1.5A
Ground Pin Current, Note 7
Ground Pin Current in Shutdown
Current Limit
IL = 1.5A
17
VIL ≤ 0.5V, VIN = VOUT + 1V
1.0
VOUT = 0
2.25
170
4.0
Start-up Time
VEN = VIN, IOUT = 10mA, COUT = 22µF
500
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
µA
µA
75
Flag Output
IFLG(LEAK)
VOH = 6V
1
µA
µA
mV
mV
%
2
VFLG(LO)
VIN = 2.25V, IOL = 250µA, Note 8
210
300
400
VFLG
Low threshold, % of VOUT below nominal
Hysteresis
93
2
%
High threshold, % of VOUT below nominal
99.2
1.252
1.265
%
Reference Voltage
Reference Voltage
Adjust Pin Bias Current
1.228
1.240
V
Note 9
1.215
V
40
20
80
120
nA
nA
Reference Voltage
Temp. Coefficient
Note 10
ppm/°C
Adjust Pin Bias Current
Temp. Coefficient
0.1
nA/°C
August 2003
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MIC37150/37151/37152
MIC37150/37151/37152
Micrel
Note 1. Exceeding the absolute maximum ratings may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Device is ESD sensitive. Handling precautions recommended.
Note 4.
P
= (T
– T ) / θ , where θ , depends upon the printed circuit layout. See “Applications Information.”
J(MAX) A JA JA
D(MAX)
Note 5. Specification for packaged product only.
Note 6.
Note 7.
V
= V – V
when V
decreased to 98% of its nominal output voltage with V = V +1V. For output voltages below 1.75V, dropout
OUT
DO
IN
OUT
OUT
IN
voltage specification does not apply due to a minimum input operating voltage of 2.25V.
I
is the quiescent current. I = I + I
.
OUT
GND
IN
GND
Note 8. For a 2.5V device, V = 2.250V (device is in dropout).
IN
Note 9.
V
≤ V
≤ (V –1.0V), 2.25V ≤ V ≤ 6.0V, 10mA ≤ I ≤ 1.5A, T = T
.
REF
OUT
IN
IN
L
J
MAX
Note 10. 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 = 6V for t = 10ms.
IN
MIC37150/37151/37152
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August 2003
MIC37150/37151/37152
Micrel
Typical Characteristics
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
Dropout Voltage vs.
Output Current
80
350
300
250
200
150
100
50
80
60
40
20
0
VIN = 3.3V
VOUT = 2.5V
VIN = 3.3V
VOUT = 2.5V
2.5VOUT
60
40
IOUT = 1.5A
20
IOUT = 1.5A
COUT = 47µF
CIN = 0
COUT = 10µF
CIN = 0
0
0
1E-2 1E-1 1E+0 1E+1 1E+2 1E+3
0
400
800
1200
1600
1E-2 1E-1 1E+0 1E+1 1E+2 1E+3
1
10
1k
1
10
FREQUENCY (Hz)
1k
0.01 0.1
100
0.01 0.1
100
FREQUENCY (Hz)
OUTPUT CURRENT (mA)
Dropout Voltage vs.
Temperature
Ground Current
Dropout Characteristics
vs. Output Current
500
450
400
350
300
250
200
150
100
50
18
16
14
12
10
8
3.0
2.5
2.0
1.5
1.0
0.5
0
2.5VOUT
2.5VOUT
100mA
1.5VOUT
1.5A
6
750mA
4
2
0
0
-40 -20
0
20 40 60 80 100 120
1
1.5
2
2.5
3
3.5
TEMPERATURE (°C)
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Ground Current
Ground Current
Ground Current
vs. Temperature
vs. Supply Voltage
vs. Supply Voltage
0.5
0.445
0.44
0.435
0.43
0.4
1.4
1.2
1
45
VOUT = 2.5V
VOUT = 2.5V
VOUT = 2.5V
40
35
30
25
20
15
10
5
ILOAD = 10mA
0.8
0.6
0.4
0.2
0
100mA
0.42
0.415
0.41
0.405
0.4
1500mA
1000mA
10mA
5
750mA
5 6
0
0
1
2
3
4
6
0
1
2
3
4
-40 -20
0
20 40 60 80 100 120
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Ground Current
vs. Temperature
Short Circuit Current
vs. Temperature
Ground Current
vs. Temperature
3.0
20
18
16
14
12
10
8
7
6
VOUT =2.5V
ILOAD = 1.5A
VOUT = 2.5V
ILOAD = 750mA
2.5
2.0
1.5
1.0
0.5
0
5.0
4
3
6
2
4
2
1
0
0
-40 -20
0
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)
August 2003
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MIC37150/37151/37152
MIC37150/37151/37152
Micrel
Output Voltage
vs. Temperature
Error Flag
Pull-Up Resistor
Flag-Low Voltage
vs. Temperature
2.60
2.58
2.56
2.54
2.52
2.50
2.48
2.46
2.44
2.42
2.40
6
250
200
150
100
50
VIN = 5V
5
4
3
2
1
FLAG HIGH
(OK)
FLAG LOW
(FAULT)
VIN = 2.25V
PULL-UP = 22kΩ
R
0
0
0.01 0.1
1
10 100 100010000
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
RESISTANCE (kΩ)
TEMPERATURE (°C)
TEMPERATURE (°C)
MIC37150/37151/37152
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August 2003
MIC37150/37151/37152
Micrel
Functional Characteristics
Load Transient Response
Load Transient Response
VIN = 3.3V
VOUT = 2.5
COUT = 10µF
VIN = 3.3V
VOUT = 2.5V
COUT = 47µF
1.5A
1.5A
10mA
100mA
TIME (400µs/div.)
TIME (400µs/div.)
Line Transient Response
VOUT = 2.5V
COUT = 10µF
5V
3.3V
TIME (250µs/div.)
August 2003
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MIC37150/37151/37152
MIC37150/37151/37152
Micrel
Referto“ApplicationNote9” forfurtherdetailsandexamples
on thermal design and heat sink applications.
Applications Information
The MIC37150/51/52 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
Output Capacitor
The MIC37150/51/52 requires an output capacitor for stable
operation. As a µCap LDO, the MIC37150/51/52 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 MIC37151 is 10µF.
these devices is limited only by the low V
voltage.
saturation
For 47µF or greater, the ESR range recommended is less
than1Ω.Ultra-lowESRceramiccapacitorsarerecommended
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 recom-
mended because of their temperature performance. X7R-
type capacitors change capacitance by 15% over their op-
erating 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. The
MIC37150/51/52 has excellent transient response to varia-
tions 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, isallthatisrequired. Largervalueshelptoimprove
performance even further.
CE
A trade-off for the low dropout voltage is a varying base drive
requirement. Micrel’s Super ßeta PNP™ process reduces
this drive requirement to only 2% to 5% of the load current.
The MIC37150/51/52 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. Transient protection allows device (and load) sur-
vival 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.
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 )
Input Capacitor
A
• Output current (I
)
An input capacitor of 1.0µF or greater is recommended when
the device is more than 4 inches away from the bulk and
supply capacitance, or when the supply is a battery. Small,
surface-mount chip capacitors can be used for the bypass-
ing. The capacitor should be place within 1” of the device for
optimal performance. Larger values will help to improve
ripplerejectionbybypassingtheinputtotheregulator, further
improving the integrity of the output voltage.
OUT
• Output voltage (V
)
OUT
• Input voltage (V )
IN
• 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
Transient Response and 3.3V to 2.5V, 2.5V to 1.8V or
1.65V, or 2.5V to 1.5V Conversions
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:
The MIC37150/51/52 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 10µF output
capacitor, preferably tantalum, is all that is required. Larger
values help to improve performance even further.
θ
= ((T
– T )/ P ) – (θ + θ
)
o
SA
J(MAX)
A
D
JC
CS
o
o
Where T
≤ 125 C and θ is between 0 C and 2 C/W.
J(MAX)
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 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.
By virtue of its low dropout voltage, this device does not
saturate into dropout as readily as similar NPN-based de-
signs. 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 MIC37150/51/52 regulator will
provideexcellentperformancewithaninputaslowas3.0Vor
MIC37150/37151/37152
8
August 2003
MIC37150/37151/37152
Micrel
2.25V, respectively. This gives the PNP-based regulators a
distinct advantage over older, NPN-based linear regulators.
Adjustable Regulator Design
Minimum Load Current
MIC37152
VIN
IN
OUT
VOUT
COUT
The MIC37150/51/52 regulator is specified between finite
loads. If the output current is too small, leakage currents
dominateandtheoutputvoltagerises.A10mAminimumload
current is necessary for proper operation.
R1
R2
ENABLE
SHUTDOWN
EN
ADJ
GND
Error Flag
R1
R2
V
= 1.240V 1+
OUT
The MIC37151 features an error flag circuit that monitors the
output voltage and signals an error condition when the
voltage 5% below the nominal output voltage. The error flag
is an open-collector output that can sink 10mA during a fault
condition.
Figure 1. Adjustable Regulator with Resistors
The MIC37152 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.
V
Enable Input
OUT
R1= R2
−1
1.240
TheMIC37151/37152alsofeaturesanenableinputforon/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
connected to up to V . When enabled, it draws approxi-
mately 15µA.
Where V
is the desired output voltage. Figure 1 shows
OUT
component definition. Applications with widely varying load
currents may scale the resistors to draw the minimum load
current required for proper operation (see above).
IN
August 2003
9
MIC37150/37151/37152
MIC37150/37151/37152
Micrel
Package Information
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)
0.370–0.005
9.395–0.125
0.355–0.005
9.015–0.125
0.075–0.005
1.905–0.125
0.040–0.010
1.015–0.255
0.256
6.50
0.010
0.250
0.316 BSC
0.315–0.005 (8.03 BSC)
8.000–0.130
0.040–0.005
1.015–0.125
INCHES
MILLIMETER
0.415–0.005
10.54–0.130
0.003–0.002
0.080–0.050
0.010
0.250
0.067
1.700
0.028–0.003
0.710–0.080
0.036–0.005
0.915–0.125
0¡ min
6¡ max
5-Lead S-PAK (R)
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.
MIC37150/37151/37152
10
August 2003
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