MIC5259
300mA High PSRR, Low Noise µCap CMOS LDO
General Description
The MIC5259 is an efficient CMOS voltage regulator
optimized for low-noise applications. It offers 1.5% initial
accuracy, low dropout voltage (300mV at 300mA) and low
ground current (typically 105µA at light load). The
MIC5259 provides a very-low-noise output, ideal for RF
applications where a clean voltage source is required. The
MIC5259 has a high PSRR even at low supply voltages,
critical for battery operated electronics. A noise bypass pin
is also available for further reduction of output noise.
Designed specifically for handheld and battery-powered
devices, the MIC5259 provides a TTL-logic-compatible
enable pin. When disabled, power consumption drops to
nearly zero.
The MIC5259 also works with low-ESR ceramic
capacitors, reducing the amount of board space necessary
for power applications; critical issue in handheld wireless
devices.
Key features include current limit, thermal shutdown, faster
transient response, and an active clamp to speed up
device turn-off. The MIC5259 is available in the 6-pin
2mm × 2mm MLF
®
package and the 5-pin Thin SOT-23
package in a wide range of output voltages.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
Input voltage range: 2.7V to 6.0V
PSRR = 70dB @ 1kHz
Low output noise: 30µV(rms)
Stability with ceramic output capacitors
Low-dropout: 300mV @ 300mA
High-output accuracy:
– 1.5% initial accuracy
– 3.0% over temperature
Low quiescent current: 105µA
Tight load and line regulation
TTL-Logic-controlled enable input
“Zero” off-mode current
Thermal shutdown and current limit protection
•
•
•
•
•
Applications
•
•
•
•
•
•
•
Cellular phones and pagers
Cellular accessories
Battery-powered equipment
Laptop, notebook, and palmtop computers
Consumer/personal electronics
Industrial portable electronics
PC peripherals
Typical Application
C
IN
= 1.0µF
Ceramic
Enable
Shutdown
V
IN
MIC5259-x.xBD5/YD5
1
2
3
4
5
V
OUT
C
OUT
= 1.0µF
Ceramic
C
BYP
= 0.01µF
ENABLE
SHUTDOWN
V
IN
EN
MIC5259-x.xBML/YML
1
2
6
5
4
V
OUT
C
BYP
(optional)
C
OUT
= 1.0µF
EN
C
IN
= 1.0µF
EN (pin 3) may be
connected directly
to IN (pin 1).
3
0.01µF
Ultra-Low Noise Regulator Application
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
September 2006
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Micrel, Inc.
MIC5259
Ordering Information
(1)
Part Number
Standard
MIC5259-1.5BD5
MIC5259-1.8BD5
MIC5259-2.5BD5
MIC5259-2.8BD5
MIC5259-2.85BD5
MIC5259-3.0BD5
MIC5259-3.3BD5
Pb-Free
MIC5259-1.5YD5
MIC5259-1.8YD5
MIC5259-2.5YD5
MIC5259-2.8YD5
MIC5259-2.85YD5
MIC5259-3.0YD5
MIC5259-3.3YD5
MIC5259-1.5YML
MIC5259-1.8YML
MIC5259-2.1YML
MIC5259-2.5BML
MIC5259-2.8BML
MIC5259-2.85BML
MIC5259-3.0BML
MIC5259-3.3BML
*
**
Marking
Standard
NY15
NY18
NY25
NY28
NY2J
NY30
NY33
Pb-Free*
NY15
NY18
NY25
NY28
NY2J
NY30
NY33
Y15
Y18
Y21
Y25
Y28
Y2J
Y30
Y33
Y25
Y28
Y2J
Y30
Y33
Voltage
1.5V
1.8V
2.5V
2.8V
2.85V
3.0V
3.3V
1.5V
1.8V
2.1V
2.5V
2.8V
2.85V
3.0V
3.3V
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
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
5-Pin Thin SOT23-5
5-Pin Thin SOT23-5
5-Pin Thin SOT23-5
5-Pin Thin SOT23-5
5-Pin Thin SOT23-5
5-Pin Thin SOT23-5
5-Pin Thin SOT23-5
6-Pin 2mm x 2mm MLF
®
6-Pin 2mm x 2mm MLF
®
6-Pin 2mm x 2mm MLF
®
6-Pin 2mm x 2mm MLF
®
6-Pin 2mm x 2mm MLF
®
MIC5259-2.5YML
MIC5259-2.8YML
MIC5259-2.85YML
MIC5259-3.0YML
MIC5259-3.3YML
6-Pin 2mm x 2mm MLF
®
6-Pin 2mm x 2mm MLF
®
6-Pin 2mm x 2mm MLF
®
Under bar / Over bar symbol ( _ /
) may not be to scale.
Other voltages available, please contact Micrel Marketing for details.
Pin Configuration
EN GND IN
3
2
1
EN 1
6
BYP
NC
OUT
NYxx
NYxx
4
5
Yxx
GND 2
5
Yxx
IN 3
4
BYP
OUT
MIC5259-x.xBD5/YD5
5-Pin Thin SOT-23 (D5)
(Top View)
MIC5259-x.xBML/YML
®
6-Pin 2mm x 2mm MLF (ML)
(Top View)
Pin Description
Pin Number
TSOT-23-5
1
2
3
4
5
―
Pin Number
MLF
®
-6
3
2
1
6
4
5
Pin Name
IN
GND
EN
BYP
OUT
NC
Pin Name
Supply Input
Ground
Enable/Shutdown (Input): CMOS compatible input. Logic high =
enable; logic low = shutdown. Do not leave open.
Reference Bypass: Connect external 0.01µF
≤
CBYP
≤
1.0µF
capacitor to GND to reduce output noise. May be left open.
Regulator Output
No Connect
September 2006
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M9999-091406
Micrel, Inc.
MIC5259
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
).................................... 0V to +7V
Enable Input Voltage (V
EN
)................................... 0V to +7V
Power Dissipation (P
D
) ........................... Internally Limited
(3)
Junction Temperature (T
J
) ........................–40°C to +125°C
Storage Temperature (T
S
)........................... –65°C to 150°C
Lead Temperature (soldering, 5sec.)......................... 260°C
EDS Rating
(4)
.................................................................. 2kV
Operating Ratings
(2)
Supply voltage (V
IN
) ........................................ +2.7V to +6V
Enable Input Voltage (V
EN
)..................................... 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Thermal Resistance
TSOT-23 (θ
JA
)..................................................235°C/W
2x2 MLF
®
(θ
JA
)...................................................90°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 1V; V
EN
= V
IN;
I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C< T
J
< +125°C, unless noted.
Symbol
V
O
∆V
LRN
∆V
LDR
V
IN
– V
OUT
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(7)
Condition
I
OUT
= 100µA
V
IN
= V
OUT
+ 1V to 6V
I
OUT
= 0.1mA to 300mA(6)
I
OUT
= 150mA
I
OUT
= 300mA
V
EN
≤
0.4V (shutdown)
I
OUT
= 0mA
I
OUT
= 300mA
f = 10Hz, C
OUT
= 1.0µF, C
BYP
= 0.01µF
f = 10Hz, V
IN
= V
OUT
+ 0.3V
f = 10kHz, V
IN
= V
OUT
+ 0.3V
V
OUT
= 0V
C
OUT
1.0µF, C
BYP
= 0.01µF,
f = 10Hz to 100kHz
V
IN
= 2.7 to 5.5V, regulator shutdown
V
IN
= 2.7V to 5.5V, regulator enabled
V
IL
≤
0.4V, regulator shutdown
V
IH
≥
1.6V, regulator enabled
Min
–1.5
–3
–0.3
Typ
Max
1.5
3
0.3
3.0
500
550
1
150
250
Units
%
%
%/V
%
mV
mV
mV
µA
µA
µA
dB
dB
dB
mA
µV
(RMS)
0.02
0.6
150
300
0.2
105
120
65
53
53
475
30
I
Q
I
GND
PSRR
Quiescent Current
Ground Pin Current
(8)
Ripple Rejection; I
OUT
= 150mA
I
LIM
e
n
Enable Input
V
IL
V
IH
I
EN
Current Limit
Output Voltage Noise
350
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
0.4
1.6
0.01
0.01
500
150
10
1
1
Shutdown Resistance Discharge
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
V
V
µA
µA
Ω
°C
°C
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 T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The
θ
JA
of the MIC5259-x.xBM5 (all versions) is
235°C/W on a PC board. See “Thermal Considerations” section for further details.
4. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
6. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range
from 0.1mA to 300mA. 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 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum input operating
voltage is 2.7V.
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.
September 2006
3
M9999-091406
Micrel, Inc.
MIC5259
Typical Characteristics
September 2006
4
M9999-091406
Micrel, Inc.
MIC5259
Typical Characteristics (cont.)
September 2006
5
M9999-091406
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