MIC5305-3.0BD5 [MICREL]
150mA UCap Ultra-Low Dropout LDO Regulator; 150毫安UCAP超低压差LDO稳压器
| 型号： | MIC5305-3.0BD5 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 150mA UCap Ultra-Low Dropout LDO Regulator |
| 文件： | 总12页 (文件大小：191K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5305
150mA µCap Ultra-Low Dropout LDO Regulator
General Description
Features
The MIC5305 is a high-performance, 150mA LDO regulator,
offering extremely high PSRR and very low noise while
consuming low ground current.
• Ultra-low dropout voltage of 60mV @ 150mA
• Input voltage range: 2.25 to 5.5V
• Stable with ceramic output capacitor
• 150mA guaranteed output current
• Low output noise — 20µVrms
Ideal for battery-operated applications, the MIC5305 fea-
tures 1% accuracy, extremely low-dropout voltage (60mV @
150mA), and low ground current at light load (typically 90µA).
Equipped with a logic-compatible enable pin, the MIC5305
can be put into a zero-off-mode current state, drawing no
current when disabled.
• Low quiescent current of 90µA total
• High PSRR, up to 85dB @1kHz
• Less than 30µs turn-on time w/C
• High output accuracy:
= 0.01µF
BYP
• ±1.0% initial accuracy
The MIC5305 is a µCap design operating with very small
ceramic output capacitors for stability, thereby reducing
required board space and component cost.
• ±2.0% over temperature
• Thermal shutdown protection
• Current limit protection
• Tiny 2mm × 2mm MLF™-6 package
• Thin SOT-23-5 package
TheMIC5305isavailableinfixed-outputvoltagesandadjust-
able output voltages in the super-compact 2mm × 2mm
MLF™-6 leadless package and thin SOT-23-5 package.
Applications
• Cellular phones
• PDAs
• Fiber optic modules
• Portable electronics
• Notebook PCs
Additional voltage options are available. Contact Micrel
marketing.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
• Audio Codec power supplies
Typical Application
Dropout Voltage
70
60
50
40
30
20
10
0
MIC5305
3.0V
VIN
2.85V@150mA
VOUT
VIN VOUT
1µF
EN
BYP
GND
0.1µF
1µF
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
PSRR
(Bypass Pin Cap = 0.1µF)
100
90
80
70
60
50
40
30
20
10
0
150mA
50mA
100µA
0.1
1
10
100
1k
FREQUENCY (kHz)
MicroLeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 474-1000 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-081704
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MIC5305
Micrel
Ordering Information
Part Number
Marking Voltage Junction Temp. Range(1)
Package
MIC5305-1.5BML
MIC5305-1.5BD5
MIC5305-1.8BML
MIC5305-1.8BD5
MIC5305-2.5BML
MIC5305-2.5BD5
MIC5305-2.6BML
MIC5305-2.7BML
MIC5305-2.8BML
MIC5305-2.85BML
MIC5305-2.85BD5
MIC5305-2.9BML
MIC5305-2.9BD5
MIC5305-3.0BML
MIC5305-3.0BD5
MIC5305-3.3BML
MIC5305-4.75BML
MIC5305BML(2)
815
N815
818
1.5
1.5
1.8
1.8
2.5
2.5
2.6
2.7
2.8
2.85
2.85
2.9
2.9
3.0
3.0
3.3
4.75
ADJ
–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
–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
6-pin 2×2 MLF™
Thin SOT23-5
6-pin 2×2 MLF™
Thin SOT23-5
N818
825
6-pin 2×2 MLF™
Thin SOT23-5
N825
826
6-pin 2×2 MLF™
6-pin 2×2 MLF™
6-pin 2×2 MLF™
6-pin 2×2 MLF™
Thin SOT23-5
827
828
82J
N82J
829
6-pin 2×2 MLF™
Thin SOT23-5
N829
830
6-pin 2×2 MLF™
Thin SOT23-5
N830
833
6-pin 2×2 MLF™
6-pin 2×2 MLF™
6-pin 2×2 MLF™
84H
8AA
Note:
1. For other output voltage options, contact Micrel marketing.
2. Please contact Micrel marketing regarding availability.
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Pin Configuration
6
5
4
BYP
NC
6
5
4
BYP
EN
GND
VIN
1
2
3
EN
GND
VIN
1
2
3
ADJ
VOUT
VOUT
MIC5305-x.xBML
6-Pin 2mm × 2mm MLF™ (ML)
MIC5305BML (Adjustable)
6-Pin 2mm × 2mm MLF™ (ML)
(Top View)
(Top View)
EN GND VIN
3
2
1
KWxx
4
5
BYP
VOUT
MIC5305-x.xBD5
TSOT-23-5 (D5)
(Top View)
Pin Description
Pin Number
Pin Number
Pin Number
Pin Name Pin Function
MLF-6 Fixed MLF-6 Adjust. TSOT-23-5 Fixed
1
1
3
EN
Enable Input. Active High. High = on, low = off. Do not
leave floating.
2
3
4
2
3
4
2
1
5
-
GND
VIN
Ground.
Supply Input.
Output voltage.
VOUT
-
5
5
-
ADJ
NC
Adjust Input: Connect to external resistor voltage divider network.
No connection for fixed voltage parts.
6
6
4
-
BYP
Reference Bypass: Connect external 0.01µF to GND for reduced
output noise. May be left open.
HS Pad
HS Pad
EPAD
Exposed Heatsink Pad connected to ground internally.
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Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (V ) .................................... 0V to 6V
Supply Input Voltage (V ) ............................ 2.25V to 5.5V
IN
IN
Enable Input Voltage (V ) ................................... 0V to 6V
Enable Input Voltage (V ) .................................. 0V to V
EN
EN
IN
(3)
Power Dissipation (P ) ........................ Internally Limited
Junction Temperature (T ) ....................... –40°C to +125°C
D
J
Junction Temperature(T ) ........................ –40°C to +125°C
Package Thermal Resistance (est.)
J
Storage Temperature (T ) ......................... –65°C to 150°C
MLF-6 (θ ) ........................................................93 °C/W
S
JA
TSOT-23 (θ ) ...................................................235°C/W
Lead Temperature (soldering, 5 sec.) ....................... 260°C
JA
(4)
ESD .............................................................................................. 2kV
Electrical Characteristics(5)
VIN = VOUT +1.0V; COUT = 1.0µF, IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to + 125°C; unless noted.
Parameter
Condition
Min
–1.0
–2.0
Typ
Max
+1.0
+2.0
Units
%
Output Voltage Accuracy
Variation from nominal VOUT
Variation from nominal VOUT, IOUT = 100µA to 150mA
%
Output Voltage Temp. Coefficient
Line Regulation
40
0.02
0.1
20
ppm/°C
%/V
%
VIN = VOUT +1V to 5.5V
IOUT = 100µA to 150mA
IOUT = 50mA
0.3
0.5
35
Load Regulation(6)
Dropout Voltage(7)
mV
mV
µA
IOUT = 150mA
60
85
Ground Pin Current(8)
Ground Pin Current in Shutdown
Ripple Rejection
IOUT = 0 to 150mA
90
150
VEN ≤ 0.2V
0.5
85
µA
f = up to 1kHz; COUT = 1.0µF ceramic; CBYP = 0.1µF
f = 10kHz; COUT = 1.0µF ceramic; CBYP = 0.1µF
VOUT = 0V
dB
65
dB
Current Limit
300
1.0
600
20
900
100
0.2
mA
µVrms
µs
Output Voltage Noise
Turn-On Time
COUT =1µF, CBYP = 0.01µF, 10Hz to 100kHz
COUT = 1µF; CBYP = 0.01µF; IOUT= 150mA
30
Enable Input
Enable Input Voltage
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
V
V
Enable Input Current
V
IL ≤ 0.2V (Regulator Shutdown)
IH ≥ 1.0V (Regulator Enabled)
0.01
0.01
1
1
µA
µA
V
Notes:
1. Exceeding maximum ratings may damage the device.
2. The device is not guaranteed to work outside its operating ratings.
3. The maximum allowable power dissipation of any T (ambient temperature) is P (max) = (T (max) - T ) / θ . Exceeding the maximum allowable
A
D
J
A
JA
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
4. Devices are ESD sensitive. Handling precautions recommended. Human Body Model.
5. Specification for packaged product only.
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.
7. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differen-
tial. For outputs below 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V.
8. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin
current.
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Typical Characteristics
PSRR
PSRR
PSRR
(Bypass Pin Cap = 1µF)
(Bypass Pin Cap = 0.01µF)
(Bypass Pin Cap = 0.1µF)
120
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
50mA
150mA
150mA
100
150mA
100µA
80
60
40
20
0
50mA
50mA
100µA
100µA
0.1
1
10
100
1k
0.1
1
10
100
0.1
1
10
100
1k
1k
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
Ground Pin Current
Ground Pin Current
Ground Pin Current
94
92
90
88
86
84
82
80
78
76
74
72
70
94
92
90
88
86
84
82
80
78
76
74
72
70
90
85
80
75
70
V
= VOUT +1V
100
I
= 100µA
I
= 150mA
IN
LOAD
20 40 60 80 100 120
TEMPERATURE (°C)
LOAD
20 40 60 80 100 120
TEMPERATURE (°C)
0.1
1
10
1000
-40 -20 0
-40 -20
0
OUTPUT CURRENT (mA)
Ground Pin Current
Ground Pin Current
Dropout Characteristics
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
3.5
3
I
= 100µA
LOAD
2.5
2
I
= 150mA
1.5
1
LOAD
0.5
0
I
= 100µA
I
= 150mA
LOAD
LOAD
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Dropout Voltage
Dropout Voltage
Dropout Voltage
100
90
80
70
60
50
40
30
20
10
0
2
1.8
1.6
1.4
1.2
1
100
90
80
70
60
50
40
30
20
10
0
0.8
0.6
0.4
0.2
0
I
= 1mA
I
= 100mA
OUT
I
= 50mA
OUT
20 40 60 80 100 120
TEMPERATURE (°C)
OUT
20 40 60 80 100 120
-40 -20
0
-40 -20
0
20 40 60 80 100 120
-40 -20
0
TEMPERATURE (°C)
TEMPERATURE (°C)
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Micrel
Dropout Voltage
Dropout Voltage
Short Circuit Current
100
90
80
70
60
50
40
30
20
10
0
70
60
50
40
30
20
10
0
800
700
600
500
400
300
200
100
0
I
= 150mA
OUT
20 40 60 80 100 120
-40 -20
0
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
3
3.5
4
4.5
5
5.5
6
TEMPERATURE (°C)
INPUT VOLTAGE (V)
Enable Threshold
vs. Temperature
Output Voltage
vs. Temperature
Output Noise Spectral Density
1
2.92
2.91
2.9
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.1
2.89
2.88
2.87
2.86
2.85
0.01
ILOAD = 100µA
VIN = 5V
I
= 100µA
VOUT = 2.9V
LOAD
0.001
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY (Hz)
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Line Transient Response
Load Transient Response
5V
3V
CBYP = 0.01µF
VIN = 4V
COUT = 1µF Ceramic
CBYP = 0.01µF
OUT = 100µA
OUT = 1µF Ceramic
I
C
TIME (400µs/div)
TIME (4µs/div)
Shutdown Delay
Enable Pin Delay
CBYP = 0.01µF
IOUT = 100µA
VIN = 4V
CIN = 1µF Ceramic
COUT = 1µF Ceramic
CBYP = 0.01µF
IOUT = 100µA
CIN = 1µF Ceramic
COUT = 1µF Ceramic
TIME (10µs/div)
TIME (20ms/div)
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Functional Diagram
VIN
EN
VOUT
Quick-
Start
VREF
Error
Amp
BYP
Thermal
Shutdown
Current
Limit
GND
MIC5305 Block Diagram
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No-Load Stability
Applications Information
Unlike many other voltage regulators, the MIC5305 will
remainstableandinregulationwithnoload.Thisisespecially
import in CMOS RAM keep-alive applications.
Enable/Shutdown
The MIC5305 comes with an active-high enable pin that
allowstheregulatortobedisabled.Forcingtheenablepinlow
disables the regulator and sends it into a “zero” off-mode-
current state. In this state, current consumed by the regulator
goes nearly to zero. Forcing the enable pin high enables the
output voltage. The active-high enable pin uses CMOS
technology and the enable pin cannot be left floating; a
floating enable pin may cause an indeterminate state on the
output.
Adjustable Regulator Application
Adjustable regulators use the ratio of two resistors to multiply
the reference voltage to produce the desired output voltage.
The MIC5305 can be adjusted from 1.25V to 5.5V by using
two external resistors (Figure 1). The resistors set the output
voltage based on the following equation:
R1
Input Capacitor
VOUT = VREF 1+
R2
The MIC5305 is a high-performance, high bandwidth device.
Therefore, it requires a well-bypassed input supply for opti-
mal performance. A 1µF capacitor is required from the input
to ground to provide stability. Low-ESR ceramic capacitors
provide optimal performance at a minimum of space. Addi-
tional high frequency capacitors, such as small-valued NPO
dielectric-typecapacitors, helpfilterouthigh-frequencynoise
and are good practice in any RF-based circuit.
VREF = 1.25V
MIC5305BML
VIN
VOUT
VIN VOUT
R1
R2
1µF
Output Capacitor
1µF
EN
ADJ
GND
The MIC5305 requires an output capacitor of 1µF or greater
to maintain stability. The design is optimized for use with low-
ESR ceramic chip capacitors. High ESR capacitors may
causehighfrequencyoscillation.Theoutputcapacitorcanbe
increased, but performance has been optimized for a 1µF
ceramic output capacitor and does not improve significantly
with larger capacitance.
Figure 1. Adjustable Voltage Application
Thermal Considerations
The MIC5305 is designed to provide 150mA of continuous
currentinaverysmallpackage. Maximumambientoperating
temperature can be calculated based on the output current
and the voltage drop across the part. Given that the input
voltage is 5.0V, the output voltage is 2.9V and the output
current = 150mA.
X7R/X5R dielectric-type ceramic capacitors are recom-
mended because of their temperature performance. X7R-
type capacitors change capacitance by 15% over their oper-
ating 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 actual power dissipation of the regulator circuit can be
determined using the equation:
P = (V – V
) I
+ V I
IN GND
D
IN
OUT OUT
Because this device is CMOS and the ground current is
typically <100µA over the load range, the power dissipation
contributed by the ground current is < 1% and can be ignored
for this calculation.
Bypass Capacitor
A capacitor can be placed from the noise bypass pin to
ground to reduce output voltage noise. The capacitor by-
passes the internal reference. A 0.1µF capacitor is recom-
mended for applications that require low-noise outputs. The
bypass capacitor can be increased, further reducing noise
and improving PSRR. Turn-on time increases slightly with
respect to bypass capacitance. A unique, quick-start circuit
allows the MIC5305 to drive a large capacitor on the bypass
pin without significantly slowing turn-on time. Refer to the
TypicalCharacteristicssectionforperformancewithdifferent
bypass capacitors.
P = (5.0V – 2.9V) × 150mA
D
P = 0.32W
D
To determine the maximum ambient operating temperature
of the package, use the junction-to-ambient thermal resis-
tance of the device and the following basic equation:
T (max)− T
J
A
P (max) =
D
θ
JA
T (max) = 125°C, the max. junction temperture of the die
J
θ
thermal resistance = 93°C/W
JA
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Table 1 shows junction-to-ambient thermal resistance for the
MIC5305 in the 2mm × 2mm MLF™-6 package.
125°C − TA
93°C/W
0.32W =
Package
θJA Recommended
θJC
Minimum Footprint
2 × 2 MLF™-6
93°C/W
2°C/W
TA = 95.2°C
Table 1. SOT-23-5 Thermal Resistance
Therefore, a 2.9V application at 150mA of output current can
acceptanambientoperatingtemperatureof95.2°Cina2mm
x2mmMLF™-6package. Forafulldiscussionofheatsinking
and thermal effects on voltage regulators, refer to the “Regu-
lator Thermals” section of Micrel’s Designing with Low-
Dropout Voltage Regulators handbook. This information can
be found on Micrel's website at:
Substituting P for P (max) and solving for the ambient
D
D
operating temperature will give the maximum operating con-
ditions for the regulator circuit. The junction-to-ambient ther-
mal resistance for the minimum footprint is 93°C/W, from
Table 1. The maximum power dissipation must not be ex-
ceeded for proper operation.
For example, when operating the MIC5305-2.9BML at an
input voltage of 5.0V and 150mA load with a minimum
footprint layout, the maximum ambient operating tempera-
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
ture T can be determined as follows:
A
August 2004
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Micrel
Package Information
TOP VIEW
BOTTOM VIEW
DIMENSIONS IN
MILLIMETERS
Rev. 02
SIDE VIEW
6-Pin MLF™ (ML)
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MIC5305
Micrel
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet 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.
© 2004 Micrel, Incorporated.
August 2004
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