MIC5259
Micrel, Inc.
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 ThinSOT™-23-5 package in a wide
range of output voltages.
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
1
2
3
5
V
OUT
C
OUT
= 1.0µF
Ceramic
V
IN
ENABLE
SHUTDOWN
MIC5259-x.xBML
1
2
6
5
4
V
OUT
C
BYP
C
OUT
= 1.0µF
EN
(optional)
4
EN
C
IN
= 1.0µF
3
0.01µF
EN (pin 3) may be
connected directly
to IN (pin 1).
C
BYP
= 0.01µF
Ultra-Low-Noise Regulator Application
MicroLeadFrame
and MLF are trademarks of Amkor Technology.
ThinSOT is a trademark of Linear Technology Corporation.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2005
1
M9999-051305
MIC5259
Micrel, Inc.
Part Number
Marking
Standard Pb-Free
NY25
NY28
NY2J
NY30
NY33
Y25
Y28
Y2J
Y30
Y33
NY25
NY28
NY2J
NY30
NY33
Y25
Y28
Y2J
Y30
Y33
Voltage
2.5V
2.8V
2.85V
3.0V
3.3V
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
Package
ThinSOT™-23-5
ThinSOT™-23-5
ThinSOT™-23-5
ThinSOT™-23-5
ThinSOT™-23-5
2mm
×
2mm MLF™
2mm
×
2mm MLF™
2mm
×
2mm MLF™
2mm
×
2mm MLF™
2mm
×
2mm MLF™
Ordering Information
Standard
MIC5259-2.5BD5
MIC5259-2.8BD5
MIC5259-2.85BD5
MIC5259-3.0BD5
MIC5259-3.3BD5
MIC5259-2.5BML
MIC5259-2.8BML
MIC5259-2.85BML
MIC5259-3.0BML
MIC5259-3.3BML
Pb-Free
MIC5259-2.5YD5
MIC5259-2.8YD5
MIC5259-2.85YD5
MIC5259-3.0YD5
MIC5259-3.3YD5
MIC5259-2.5YML
MIC5259-2.8YML
MIC5259-2.85YML
MIC5259-3.0YML
MIC5259-3.3YML
Other voltages available. Contact Micrel for details.
Pin Configuration
EN
GND
IN
3
2
1
NYxx
4
5
EN 1
GND 2
IN 3
6 BYP
5 NC
4 OUT
BYP
OUT
MIC5259-x.xBD5
ThinSOT™-23-5 (D5)
(Top View)
MIC5259-x.xBML
6-Pin 2mm
×
2mm MLF™ (ML)
(Top View)
Pin Description
Pin Number
ThinSOT™-23-5
1
2
3
4
5
Pin Number
MLF™-6
3
2
1
6
4
Pin Name
IN
GND
EN
BYP
OUT
Pin Function
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 ≤ C
BYP
≤ 1.0µF capacitor to
GND to reduce output noise. May be left open.
Regulator Output.
M9999-051305
2
May 2005
MIC5259
Micrel, Inc.
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, 5 sec.) ........................ 260°C
ESD
(4)
............................................................................ 2kV
Electrical Characteristics
(5)
Symbol
V
O
ΔV
LNR
ΔV
LDR
V
IN
– V
OUT
Parameter
Conditions
Operating Ratings
(2)
Input 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
ThinSOT™-23
(θ
JA
) ...........................................235°C/W
2mm
×
2mm MLF™
(θ
JA
) ....................................90°C/W
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.
Min
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(7)
I
OUT
= 100µA
V
IN
= V
OUT
+ 1V to 6V
I
OUT
= 150mA
I
OUT
= 300mA
–1.5
–3
–0.3
Typical
Max
1.5
3
Units
%
%
%/V
%
mV
mV
mV
µA
µA
µA
dB
dB
dB
mA
0.02
0.6
150
300
0.2
105
120
65
53
53
0.3
3.0
500
550
1
150
250
I
OUT
= 0.1mA to 300mA
(6)
I
Q
Quiescent Current
Ground Pin
Current
(8)
I
GND
PSRR
V
EN
≤ 0.4V (shutdown)
I
OUT
= 300mA
I
OUT
= 0mA
Ripple Rejection; I
OUT
= 150mA
f = 10Hz, V
IN
= V
OUT
+ 0.3V
V
OUT
= 0V
f = 10Hz, C
OUT
= 1.0µF, C
BYP
= 0.01µF
I
LIM
Current Limit
Output Voltage Noise
f = 10kHz, V
IN
= V
OUT
+ 0.3V
350
475
30
e
n
µV(rms)
Enable Input
V
IL
C
OUT
= 1.0µF, C
BYP
= 0.01µF,
f = 10Hz to 100kHz
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
Shutdown Resistance Discharge
V
IH
I
EN
V
IN
= 2.7V to 5.5V, regulator enabled
V
IL
≤ 0.4V, regulator shutdown
V
IH
≥ 1.6V, regulator enabled
V
IN
= 2.7 to 5.5V, regulator shutdown
0.4
1.6
0.01
0.01
500
150
10
1
1
V
V
µA
µA
Ω
°C
°C
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
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 ver-
sions) 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 differen-
tial. 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 cur-
rent.
May 2005
3
M9999-051305
MIC5259
Micrel, Inc.
Typical Characteristics
M9999-051305
4
May 2005
MIC5259
Micrel, Inc.
May 2005
5
M9999-051305
51单片机
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