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 6-pin
2mm × 2mm MLF® leadless package, our new ultra-thin
6-pin 2mm × 2mm Thin MLF® and thin SOT-23-5 package.
Additional voltage options are available. Contact Micrel
marketing.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
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•
•
•
•
•
•
•
•
•
•
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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 6-pin 2mm × 2mm MLF® package
Ultra-Thin 6-pin 2mm × 2mm Thin MLF® 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
2.85V@150mA
VOUT
VIN VOUT
1µF
EN
BYP
0.1µF
DROPOUT VOLTAGE (mV)
70
60
50
40
30
20
10
0
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
1µF
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
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2007
1
M9999-062507
Micrel, Inc.
MIC5305
Ordering Information
Part Number
Marking
Voltage
Junction
Temp. Range(1)
Package
815
1.5V
–40°C to +125°C
6-Pin 2x2 MLF
®
818
1.8V
–40°C to +125°C
6-Pin 2x2 MLF
®
820
2.0V
–40°C to +125°C
6-Pin 2x2 MLF
®
Standard
Pb-Free
Standard
Pb-Free*
MIC5305-1.5BML
MIC5305-1.5YML
815
MIC5305-1.8BML
MIC5305-1.8YML
818
MIC5305-2.0YML
MIC5305-2.5BML
MIC5305-2.5YML
825
825
2.5V
–40°C to +125°C
6-Pin 2x2 MLF
®
MIC5305-2.6BML
MIC5305-2.6YML
826
826
2.6V
–40°C to +125°C
6-Pin 2x2 MLF
®
MIC5305-2.7BML
MIC5305-2.7YML
827
827
2.7V
–40°C to +125°C
6-Pin 2x2 MLF
®
MIC5305-2.8BML
MIC5305-2.8YML
828
828
2.8V
–40°C to +125°C
6-Pin 2x2 MLF
®
MIC5305-2.85BML
MIC5305-2.85YML
82J
82J
2.85V
–40°C to +125°C
6-Pin 2x2 MLF
®
MIC5305-2.9BML
MIC5305-2.9YML
829
829
2.9V
–40°C to +125°C
6-Pin 2x2 MLF
®
MIC5305-3.0BML
MIC5305-3.0YML
830
830
3.0V
–40°C to +125°C
6-Pin 2x2 MLF
®
MIC5305-3.3BML
MIC5305-3.3YML
833
833
3.3V
–40°C to +125°C
6-Pin 2x2 MLF
®
MIC5305-4.75BML
MIC5305-4.75YML
84H
84H
4.75V
–40°C to +125°C
6-Pin 2x2 MLF
®
MIC5305BML
MIC5305YML
8AA
8AA
ADJ
–40°C to +125°C
6-Pin 2x2 MLF
®
MIC5305-2.8YMT
828**
2.8V
–40°C to +125°C
6-Pin 2x2 Thin MLF
®
MIC5305-4.6YMT
846**
4.6V
–40°C to +125°C
6-Pin 2x2 Thin MLF
®
MIC5305-1.5BD5
MIC5305-1.5YD5
N815
N815
1.5V
–40°C to +125°C
Thin SOT23-5
MIC5305-1.8BD5
MIC5305-1.8YD5
N818
N818
1.8V
–40°C to +125°C
Thin SOT23-5
MIC5305-2.5BD5
MIC5305-2.5YD5
N825
N825
2.5V
–40°C to +125°C
Thin SOT23-5
MIC5305-2.6BD5
MIC5305-2.6YD5
N826
N826
2.6V
–40°C to +125°C
Thin SOT23-5
MIC5305-2.7BD5
MIC5305-2.7YD5
N827
N827
2.7V
–40°C to +125°C
Thin SOT23-5
MIC5305-2.8BD5
MIC5305-2.8YD5
N828
N828
2.8V
–40°C to +125°C
Thin SOT23-5
MIC5305-2.85BD5
MIC5305-2.85YD5
N82J
N82J
2.85V
–40°C to +125°C
Thin SOT23-5
MIC5305-2.9BD5
MIC5305-2.9YD5
N829
N829
2.9V
–40°C to +125°C
Thin SOT23-5
MIC5305-3.0BD5
MIC5305-3.0YD5
N830
N830
3.0V
–40°C to +125°C
Thin SOT23-5
MIC5305-3.3BD5
MIC5305-3.3YD5
N833
N833
3.3V
–40°C to +125°C
Thin SOT23-5
MIC5305-4.75BD5
MIC5305-4.75YD5
N84H
N84H
4.75V
–40°C to +125°C
Thin SOT23-5
Note:
1. For other output voltage options, contact Micrel marketing.
* Underbar/Overbar symbols may not be to scale.
®
** Pin 1 identifier for 2x2 Thin MLF is “▲” symbol.
June 2007
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M9999-062507
Micrel, Inc.
MIC5305
Pin Configuration
EN 1
GND 2
VIN 3
6 BYP
5 NC
GND 2
VIN 3
6 BYP
GND 2
5 ADJ
4 VOUT
4 VOUT
VIN 3
MIC5305-x.xBML/YML (Fixed)
6-Pin 2mm x 2mm MLF® (ML)
(Top View)
EN 1
EN 1
MIC5305-x.xBML/YML (Adjustable)
6-Pin 2mm x 2mm MLF® (ML)
(Top View)
EN GND VIN
6 BYP
3
2
1
KWxx
5 NC
4 VOUT
4
BYP
5
VOUT
MIC5305-x.xBD5/YD5 (Fixed)
TSOT-23-5 (D5)
(Top View)
MIC5305-x.xYMT (Fixed)
®
6-Pin 2mm x 2mm Thin MLF (MT)
(Top View)
Pin Description
Pin Number
MLF-6
Fixed
Pin Number
MLF-6
Adjustable
Pin Number
Thin MLF-6
Fixed
Pin Number
TSOT23-5
Fixed
Pin Name
1
1
1
3
EN
2
2
2
2
GND
Ground.
3
3
3
1
VIN
Supply Input.
4
4
4
5
VOUT
–
5
–
5
–
5
–
NC
No connection for fixed voltage parts.
6
6
6
4
BYP
Reference Bypass: Connect external 0.1µF to GND for reduced
output noise. May be left open.
HS Pad
HS Pad
HS Pad
–
EPAD
June 2007
ADJ
3
Pin Name
Enable Input. Active High. High = on, low = off. Do not leave
floating.
Output Voltage.
Adjust Input: Connect to external resistor voltage divider
network.
Exposed Heatsink Pad connected to ground internally.
M9999-062507
Micrel, Inc.
MIC5305
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply 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
Lead Temperature (soldering, 5sec.)......................... 260°C
Storage Temperature (Ts) .........................–65°C to +150°C
EDS Rating(4) .................................................................. 2kV
Supply voltage (VIN) ....................................... 2.25V to 5.5V
Enable Input Voltage (VEN)..................................... 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Junction Thermal Resistance
MLF-6 (θJA) ........................................................93°C/W
Thin MLF-6 (θJA) ................................................93°C/W
TSOT-23-5 (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
Output Voltage Accuracy
Min
Max
Units
Variation from nominal VOUT
–1.0
+1.0
%
Variation from nominal VOUT, IOUT = 100mA to 150mA
–2.0
+2.0
%
Output Voltage Temp.
Coefficient
Line Regulation
Typ
40
pm/°C
VIN = VOUT +1V to 5.5V
0.02
0.3
%/V
(6)
IOUT = 100µA to 150mA
0.1
0.5
%
(7)
IOUT = 50mA, VOUT > 2.8V
20
35
mV
IOUT = 150mA, VOUT > 2.8V
60
85
mV
IOUT = 50mA, VOUT > 2.8V
27
45
mV
IOUT = 150mA, VOUT > 2.8V
85
110
mV
150
µA
Load Regulation
Dropout Voltage
Ground Pin Current
(8)
IOUT = 0 to 150mA
90
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
Current Limit
VOUT = 0V
Output Voltage Noise
COUT =1µF, CBYP = 0.1µF, 10Hz to 100kHz
20
Turn-On Time
COUT = 1µF; CBYP= 0.1µF; IOUT= 150mA
30
300
600
dB
900
mA
µVrms
100
µs
0.2
V
Enable Input
Enable Input Voltage
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
Enable Input Current
V
1.0
VIL ≤ 0.2V (Regulator Shutdown)
0.01
1
µA
VIH ≥ 1.0V (Regulator Enabled)
0.01
1
µA
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
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 VOUT. 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.
June 2007
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M9999-062507
Micrel, Inc.
MIC5305
Typical Characteristics
PSRR
(Bypass Pin Cap = 0.01µF)
50mA
100µA
70
60
60
40
50
40
1k
75
VIN = VOUT +1V
1
10
100
1000
OUTPUT CURRENT (mA)
Ground Pin Current
GROUND CURRENT (µA)
50
40
30
20
2
ILOAD = 100µA
1
2
3
4
5
INPUT VOLTAGE (V)
Dropout Voltage
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
I
= 1mA
0.2
OUT
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE(°C)
June 2007
80
70
60
50
40
30
20
10
0
100
ILOAD = 150mA
1
2
3
4
5
INPUT VOLTAGE (V)
Dropout Voltage
70
60
50
40
30
20
10
IOUT = 50mA
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
5
1k
Dropout Characteristics
I
3
LOAD
= 100µA
2.5
2
I
= 150mA
LOAD
1.5
1
0.5
0
6
90
80
1
10
100
FREQUENCY (kHz)
94
92
90
88
86
84
82
80
78
76
74
I
= 150mA
72
LOAD
70
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
3.5
90
0
6
DROPOUT VOLTAGE (mV)
10
0
0
Ground Pin Current
100
50mA
Ground Pin Current
OUTPUT VOLTAGE (V)
80
100
90
80
70
60
10
0
0.1
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)
100µA
40
30
20
GROUND CURRENT (µA)
GROUND CURRENT (µA)
85
70
0.1
1
10
100
FREQUENCY (kHz)
150mA
70
60
50
Ground Pin Current
90
GROUND CURRENT (µA)
100µA
DROPOUT VOLTAGE (mV)
1
10
100
FREQUENCY (kHz)
0
0.1
Ground Pin Current
GROUND CURRENT (µA)
50mA
20
10
0
0.1
DROPOUT VOLTAGE (mV)
90
80
30
20
PSRR
(Bypass Pin Cap = 1µF)
100
150mA
80
150mA
80
PSRR
(Bypass Pin Cap = 0.1µF)
PSRR (dB)
100
PSRR (dB)
100
90
PSRR (dB)
120
0
100
90
80
1
2
3
4
5
INPUT VOLTAGE (V)
6
Dropout Voltage
70
60
50
40
30
20
10
I
= 100mA
OUT
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
M9999-062507
Micrel, Inc.
70
60
50
40
30
20
10
IOUT = 150mA
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
2.92
Output Voltage
vs. Temperature
2.91
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)
June 2007
DROPOUT VOLTAGE (mV)
90
80
70
Dropout Voltage
60
50
40
30
20
10
0
1
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
Enable Threshold
vs. Temperature
SHORT CIRCUIT CURRENT (mA)
Dropout Voltage
ENABLE THRESHOLD VOLTAGE (V)
DROPOUT VOLTAGE (mV)
100
MIC5305
Short Circuit Current
800
700
600
500
400
300
200
100
0
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
6
Output Noise Spectral Density
0.9
0.8
0.7
0.6
0.5
0.4
I
= 100µA
LOAD
0.3
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
6
M9999-062507
Micrel, Inc.
MIC5305
Functional Characteristics
Load Transient Response
OutputVoltage
(50mV/div)
Line Transient Response
3V
CBYP = 0.01µF
IOUT = 100µA
COUT = 1µF Ceramic
TIME (400µs/div)
TIME (4µs/div)
Enable Pin Delay
EnableVoltage
(1V/div)
OutputVoltage
(1V/div)
OutputVoltage
(1V/div)
EnableVoltage
(1V/div)
Shutdown Delay
CBYP = 0.01µF
IOUT = 100µA
CIN = 1µF Ceramic
COUT = 1µF Ceramic
TIME (10µs/div)
June 2007
CBYP = 0.01µF
VIN = 4V
COUT = 1µF Ceramic
Output Current
(100mA/div)
OutputVoltage
(1V/div)
Input Voltage
(1V/div)
5V
CBYP = 0.01µF
IOUT = 100µA
VIN = 4V
CIN = 1µF Ceramic
COUT = 1µF Ceramic
TIME (20µs/div)
7
M9999-062507
Micrel, Inc.
MIC5305
Functional Diagram
VIN
VOUT
EN
VREF
QuickStart
Error
LDO
Amp
BYP
Thermal
Shutdown
Current
Limit
GND
MIC5305 Block Diagram – Fixed
VIN
VOUT
EN
QuickStart
VREF
Error
LDO
Amp
BYP
Thermal
Shutdown
Current
Limit
GND
MIC5305 Block Diagram – Adjustable
June 2007
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M9999-062507
Micrel, Inc.
MIC5305
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.
Application 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-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 ⎞
⎛
VOUT = VREF ⎜1 +
⎟
R2
⎝
⎠
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.
VREF = 1.25V
MIC5305BML
VIN
R1
1µF
Output Capacitor
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 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.
X7R-type 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.
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
