MICREL MIC5305

MIC5305
Micrel
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.
Ideal for battery-operated applications, the MIC5305 features 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.
The MIC5305 is a µCap design operating with very small
ceramic output capacitors for stability, thereby reducing
required board space and component cost.
The MIC5305 is available in fixed-output voltages and adjustable output voltages in the super-compact 2mm × 2mm
MLF™-6 leadless package and thin SOT-23-5 package.
Additional voltage options are available. Contact Micrel
marketing.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
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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
Low quiescent current of 90µA total
High PSRR, up to 85dB @1kHz
Less than 30µs turn-on time w/CBYP = 0.01µF
High output accuracy:
• ±1.0% initial accuracy
• ±2.0% over temperature
Thermal shutdown protection
Current limit protection
Tiny 2mm × 2mm MLF™-6 package
Thin SOT-23-5 package
Applications
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Cellular phones
PDAs
Fiber optic modules
Portable electronics
Notebook PCs
Audio Codec power supplies
Typical Application
Dropout Voltage
MIC5305
3.0V
VIN
[email protected]
VOUT
VIN VOUT
1µF
EN
BYP
0.1µF
DROPOUT VOLTAGE (mV)
70
1µF
60
50
40
30
20
10
0
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
GND
100
90
PSRR
(Bypass Pin Cap = 0.1µF)
150mA
PSRR (dB)
80
70
60
50
40
50mA
100µA
30
20
10
0
0.1
1
10
100
FREQUENCY (kHz)
1k
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
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Ordering Information
Marking
Voltage
Junction Temp. Range(1)
Package
MIC5305-1.5BML
815
1.5
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305-1.5BD5
N815
1.5
–40°C to +125°C
Thin SOT23-5
MIC5305-1.8BML
818
1.8
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305-1.8BD5
N818
1.8
–40°C to +125°C
Thin SOT23-5
MIC5305-2.5BML
825
2.5
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305-2.5BD5
N825
2.5
–40°C to +125°C
Thin SOT23-5
MIC5305-2.6BML
826
2.6
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305-2.7BML
827
2.7
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305-2.8BML
828
2.8
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305-2.85BML
82J
2.85
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305-2.85BD5
N82J
2.85
–40°C to +125°C
Thin SOT23-5
MIC5305-2.9BML
829
2.9
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305-2.9BD5
N829
2.9
–40°C to +125°C
Thin SOT23-5
MIC5305-3.0BML
830
3.0
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305-3.0BD5
N830
3.0
–40°C to +125°C
Thin SOT23-5
Part Number
MIC5305-3.3BML
833
3.3
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305-4.75BML
84H
4.75
–40°C to +125°C
6-pin 2×2 MLF™
MIC5305BML(2)
8AA
ADJ
–40°C to +125°C
6-pin 2×2 MLF™
Note:
1. For other output voltage options, contact Micrel marketing.
2. Please contact Micrel marketing regarding availability.
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Pin Configuration
EN 1
GND 2
VIN 3
6 BYP
5 NC
4 VOUT
EN 1
6 BYP
GND 2
5 ADJ
VIN 3
MIC5305-x.xBML
6-Pin 2mm × 2mm MLF™ (ML)
(Top View)
4 VOUT
MIC5305BML (Adjustable)
6-Pin 2mm × 2mm MLF™ (ML)
(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
MLF-6 Fixed MLF-6 Adjust. TSOT-23-5 Fixed
Pin Function
1
1
3
EN
2
2
2
GND
Ground.
3
3
1
VIN
Supply Input.
4
4
5
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
August 2004
Enable Input. Active High. High = on, low = off. Do not
leave floating.
Output voltage.
Exposed Heatsink Pad connected to ground internally.
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Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN) .................................... 0V to 6V
Enable Input Voltage (VEN) ................................... 0V to 6V
Power Dissipation (PD) ........................ Internally Limited(3)
Junction Temperature(TJ) ........................ –40°C to +125°C
Storage Temperature (TS) ......................... –65°C to 150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD(4) .............................................................................................. 2kV
Supply Input Voltage (VIN) ............................ 2.25V to 5.5V
Enable Input Voltage (VEN) .................................. 0V to VIN
Junction Temperature (TJ) ....................... –40°C to +125°C
Package Thermal Resistance (est.)
MLF-6 (θJA) ........................................................ 93 °C/W
TSOT-23 (θJA) ................................................... 235°C/W
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
Output Voltage Accuracy
Variation from nominal VOUT
Variation from nominal VOUT, IOUT = 100µA to 150mA
Max
Units
–1.0
+1.0
%
–2.0
+2.0
%
Output Voltage Temp. Coefficient
Typ
40
ppm/°C
Line Regulation
VIN = VOUT +1V to 5.5V
0.02
0.3
%/V
Load Regulation(6)
IOUT = 100µA to 150mA
0.1
0.5
%
IOUT = 50mA
20
35
mV
IOUT = 150mA
60
85
mV
IOUT = 0 to 150mA
90
150
µA
Ground Pin Current in Shutdown
VEN ≤ 0.2V
0.5
µA
Ripple Rejection
f = up to 1kHz; COUT = 1.0µF ceramic; CBYP = 0.1µF
85
dB
f = 10kHz; COUT = 1.0µF ceramic; CBYP = 0.1µF
65
dB
Dropout
Voltage(7)
Ground Pin
Current(8)
Current Limit
VOUT = 0V
300
600
Output Voltage Noise
COUT =1µF, CBYP = 0.01µF, 10Hz to 100kHz
20
Turn-On Time
COUT = 1µF; CBYP = 0.01µF; IOUT= 150mA
30
900
mA
µVrms
100
µs
0.2
V
Enable Input
Enable Input Voltage
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
Enable Input Current
1.0
V
VIL ≤ 0.2V (Regulator Shutdown)
0.01
1
µA
VIH ≥ 1.0V (Regulator Enabled)
0.01
1
µA
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 TA (ambient temperature) is PD(max) = (TJ(max) - TA) / θJA. Exceeding the maximum allowable
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 differential. 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
(Bypass Pin Cap = 0.01µF)
100
90
50mA
40
60
50
40
20
0
0.1
1
10
100
FREQUENCY (kHz)
1k
Ground Pin Current
75
VIN = VOUT +1V
Ground Pin Current
GROUND CURRENT (µA)
GROUND CURRENT (µA)
1
10
100
1000
OUTPUT CURRENT (mA)
90
80
70
60
50
40
30
20
10
0
0
2
DROPOUT VOLTAGE (mV)
GROUND CURRENT (µA)
80
ILOAD = 100µA
1
2
3
4
5
INPUT VOLTAGE (V)
6
1.4
1.2
1
0.8
0.6
0.4
IOUT = 1mA
0.2
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
100µA
50
40
30
20
10
0
0.1
10
0
0.1
1
10
100
FREQUENCY (kHz)
1k
94
92
90
88
86
84
82
80
78
76
74
ILOAD = 100µA
72
70
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
50
40
30
20
10
0
0
100
90
ILOAD = 150mA
1
2
3
4
5
INPUT VOLTAGE (V)
Dropout Voltage
60
50
40
30
20
10
IOUT = 50mA
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
5
1k
Dropout Characteristics
ILOAD = 100µA
3
2.5
2
ILOAD = 150mA
1.5
1
0.5
0
6
80
70
1
10
100
FREQUENCY (kHz)
Ground Pin Current
3.5
60
50mA
94
92
90
88
86
84
82
80
78
76
74
ILOAD = 150mA
72
70
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Ground Pin Current
80
70
Dropout Voltage
1.8
1.6
August 2004
100µA
60
30
20
100
90
DROPOUT VOLTAGE (mV)
GROUND CURRENT (µA)
85
100
50mA
Ground Pin Current
90
70
0.1
PSRR (dB)
60
150mA
80
70
GROUND CURRENT (µA)
PSRR (dB)
PSRR (dB)
100µA
80
150mA
80
70
150mA
PSRR
(Bypass Pin Cap = 1µF)
100
90
OUTPUT VOLTAGE (V)
100
PSRR
(Bypass Pin Cap = 0.1µF)
0
100
DROPOUT VOLTAGE (mV)
120
1
2
3
4
5
INPUT VOLTAGE (V)
6
Dropout Voltage
90
80
70
60
50
40
30
20
10
IOUT = 100mA
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
M9999-081704
MIC5305
Micrel
VOUT (V)
2.9
2.89
2.88
2.87
2.86
ILOAD = 100µA
VOUT = 2.9V
2.85
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
20
10
0
1
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
Enable Threshold
vs. Temperature
500
400
300
200
100
0
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
6
Output Noise Spectral Density
1
0.9
0.8
0.7
0.6
0.5
0.4
ILOAD = 100µA
0.3
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0.1
0.01
VIN = 5V
0.001
1000000
2.91
30
600
100000
Output Voltage
vs. Temperature
40
700
10000
2.92
50
Short Circuit Current
1000
10
IOUT = 150mA
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
60
800
100
30
20
SHORT CIRCUIT CURRENT (mA)
50
40
Dropout Voltage
10
70
60
DROPOUT VOLTAGE (mV)
90
80
70
Spectral Noise Density (mA)
Dropout Voltage
ENABLE THRESHOLD VOLTAGE (V)
DROPOUT VOLTAGE (mV)
100
FREQUENCY (Hz)
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Line Transient Response
Output Voltage
(50mV/div)
Load Transient Response
3V
CBYP = 0.01µF
IOUT = 100µA
COUT = 1µF Ceramic
CBYP = 0.01µF
VIN = 4V
COUT = 1µF Ceramic
Output Current
(100mA/div)
Output Voltage
(1V/div)
Input Voltage
(1V/div)
5V
TIME (400µs/div)
TIME (4µs/div)
Shutdown Delay
Enable Voltage
(1V/div)
Output Voltage
(1V/div)
Output Voltage
(1V/div)
Enable Voltage
(1V/div)
Enable Pin Delay
CBYP = 0.01µF
IOUT = 100µA
CIN = 1µF Ceramic
COUT = 1µF Ceramic
TIME (10µs/div)
August 2004
CBYP = 0.01µF
IOUT = 100µA
VIN = 4V
CIN = 1µF Ceramic
COUT = 1µF Ceramic
TIME (20ms/div)
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Functional Diagram
VIN
VOUT
EN
QuickStart
VREF
Error
LDO
Amp
BYP
Thermal
Shutdown
Current
Limit
GND
MIC5305 Block Diagram
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No-Load Stability
Unlike many other voltage regulators, the MIC5305 will
remain stable and in regulation with no load. This is especially
import in CMOS RAM keep-alive applications.
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:
Applications Information
Enable/Shutdown
The MIC5305 comes with an active-high enable pin that
allows the regulator to be disabled. Forcing the enable pin low
disables the regulator and sends it into a “zero” off-modecurrent 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.
Input Capacitor
The MIC5305 is a high-performance, high bandwidth device.
Therefore, it requires a well-bypassed input supply for optimal 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. Additional high frequency capacitors, such as small-valued NPO
dielectric-type capacitors, help filter out high-frequency noise
and are good practice in any RF-based circuit.
Output Capacitor
The MIC5305 requires an output capacitor of 1µF or greater
to maintain stability. The design is optimized for use with lowESR ceramic chip capacitors. High ESR capacitors may
cause high frequency oscillation. The output capacitor can be
increased, but performance has been optimized for a 1µF
ceramic output capacitor and does not improve significantly
with larger capacitance.
X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7Rtype capacitors change capacitance by 15% over their operating temperature range and are the most stable type of
ceramic capacitors. Z5U and Y5V dielectric capacitors change
value by as much as 50% and 60%, respectively, over their
operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an
X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range.
Bypass Capacitor
A capacitor can be placed from the noise bypass pin to
ground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.1µF capacitor is recommended 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
Typical Characteristics section for performance with different
bypass capacitors.
August 2004
 R1
VOUT = VREF 1 +

 R2 
VREF = 1.25V
MIC5305BML
VIN
VOUT
VIN VOUT
R1
1µF
EN
ADJ
GND
1µF
R2
Figure 1. Adjustable Voltage Application
Thermal Considerations
The MIC5305 is designed to provide 150mA of continuous
current in a very small package. Maximum ambient operating
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.
The actual power dissipation of the regulator circuit can be
determined using the equation:
PD = (VIN – VOUT) IOUT + VIN IGND
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.
PD = (5.0V – 2.9V) × 150mA
PD = 0.32W
To determine the maximum ambient operating temperature
of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation:
 T (max) − TA 
PD (max) =  J

θ JA


TJ(max) = 125°C, the max. junction temperture of the die
θJA thermal resistance = 93°C/W
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Table 1 shows junction-to-ambient thermal resistance for the
MIC5305 in the 2mm × 2mm MLF™-6 package.
Package
θJA Recommended
Minimum Footprint
θJC
2 × 2 MLF™-6
93°C/W
2°C/W
0.32W =
TA = 95.2°C
Table 1. SOT-23-5 Thermal Resistance
Therefore, a 2.9V application at 150mA of output current can
accept an ambient operating temperature of 95.2°C in a 2mm
x 2mm MLF™-6 package. For a full discussion of heat sinking
and thermal effects on voltage regulators, refer to the “Regulator Thermals” section of Micrel’s Designing with LowDropout Voltage Regulators handbook. This information can
be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum operating conditions for the regulator circuit. The junction-to-ambient thermal resistance for the minimum footprint is 93°C/W, from
Table 1. The maximum power dissipation must not be exceeded 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 temperature TA can be determined as follows:
August 2004
125°C − TA
93°C/W
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Package Information
TOP VIEW
BOTTOM VIEW
DIMENSIONS IN
MILLIMETERS
SIDE VIEW
Rev. 02
6-Pin MLF™ (ML)
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MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
WEB
USA
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.
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