MIC5259-3.3BML [MICREL]
300mA High PSRR, Low Noise UCap CMOS LDO; 300毫安高PSRR ，低噪声UCAP CMOS LDO
| 型号： | MIC5259-3.3BML |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 300mA High PSRR, Low Noise UCap CMOS LDO |
| 文件： | 总9页 (文件大小：3272K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5259
300mA High PSRR, Low Noise µCap CMOS LDO
General Description
Features
TheMIC5259isanefficientCMOSvoltageregulatoroptimized
for low-noise applications. It offers 1.5% initial accuracy, low
dropout voltage (300mV at 300mA) and low ground current
(typically 105µAat 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.
• 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
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.
• Thermal shutdown and current limit protection
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.
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• Consumer/personal electronics
• Industrial portable electronics
• PC peripherals
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.
Typical Application
VOUT
VIN
EN
MIC5259-x.xBD5
VOUT
VIN
MIC5259-x.xBML
1
2
3
5
ENABLE
SHUTDOWN
CIN = 1.0µF
Ceramic
COUT = 1.0µF
6
5
4
1
2
3
CBYP
(optional)
COUT= 1.0µF
Ceramic
4
Enable
Shutdown
0.01µF
CIN = 1.0µF
EN
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
M9999-051305
May 2005
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MIC5259
Micrel, Inc.
Ordering Information
Part Number
Marking
Standard
Pb-Free
Standard Pb-Free
Voltage
2.5V
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
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
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
NY25
NY28
NY2J
NY30
NY33
Y25
NY25
NY28
NY2J
NY30
NY33
Y25
ThinSOT™-23-5
ThinSOT™-23-5
ThinSOT™-23-5
ThinSOT™-23-5
ThinSOT™-23-5
2.8V
2.85V
3.0V
3.3V
2.5V
2mm × 2mm MLF
2mm × 2mm MLF
2mm × 2mm MLF
2mm × 2mm MLF
2mm × 2mm MLF
™
Y28
Y28
2.8V
™
™
™
™
Y2J
Y2J
2.85V
3.0V
Y30
Y30
Y33
Y33
3.3V
Other voltages available. Contact Micrel for details.
Pin Configuration
EN GND IN
3
2
1
6
5
4
BYP
NC
EN
GND
IN
1
2
3
NYxx
4
5
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
Pin Number
ThinSOT™-23-5
MLF™-6
Pin Name
Pin Function
Supply Input.
Ground.
1
2
3
3
2
1
IN
GND
EN
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
4
5
6
4
BYP
OUT
Reference Bypass: Connect external 0.01µF ≤ CBYP ≤ 1.0µF capacitor to
GND to reduce output noise. May be left open.
Regulator Output.
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MIC5259
Micrel, Inc.
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (V )....................................0V to +7V
Input Voltage (V ).......................................... +2.7V to +6V
IN
IN
Enable Input Voltage (V ) ..................................0V to +7V
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
Thermal Resistance
J
Storage Temperature(T ) ......................... –65°C to +150°C
ThinSOT™-23 (θ )...........................................235°C/W
S
JA
Lead Temperature (soldering, 5 sec.)........................ 260°C
ESD ............................................................................ 2kV
2mm × 2mm MLF™ (θ ) ....................................90°C/W
JA
(4)
Electrical Characteristics(5)
VIN = VOUT + 1V, VEN = VIN; OUT = 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.
I
Symbol
Parameter
Conditions
Min Typical Max
Units
VO
Output Voltage Accuracy
IOUT = 100µA
–1.5
–3
1.5
3
%
%
ΔVLNR
Line Regulation
Load Regulation
Dropout Voltage(7)
VIN = VOUT + 1V to 6V
IOUT = 0.1mA to 300mA(6)
IOUT = 150mA
–0.3
0.02
0.6
0.3
%/V
%
ΔVLDR
3.0
VIN – VOUT
150
300
mV
IOUT = 300mA
500
550
mV
mV
IQ
Quiescent Current
Ground Pin Current(8)
VEN ≤ 0.4V (shutdown)
IOUT = 0mA
0.2
105
120
65
1
µA
µA
µA
dB
dB
dB
mA
IGND
150
250
IOUT = 300mA
PSRR
Ripple Rejection; IOUT = 150mA
f = 10Hz, COUT = 1.0µF, CBYP = 0.01µF
f = 10Hz, VIN = VOUT + 0.3V
f = 10kHz, VIN = VOUT + 0.3V
VOUT = 0V
53
53
ILIM
Current Limit
350
475
30
en
Output Voltage Noise
COUT = 1.0µF, CBYP = 0.01µF,
µV(rms)
f = 10Hz to 100kHz
Enable Input
VIL
VIH
IEN
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
VIN = 2.7 to 5.5V, regulator shutdown
VIN = 2.7V to 5.5V, regulator enabled
VIL ≤ 0.4V, regulator shutdown
VIH ≥ 1.6V, regulator enabled
0.4
V
V
1.6
0.01
0.01
500
1
1
µA
µA
Ω
Shutdown Resistance Discharge
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
150
10
°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 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. The θJA 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.
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Micrel, Inc.
Typical Characteristics
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MIC5259
Micrel, Inc.
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MIC5259
Micrel, Inc.
Functional Characteristics
EnableTurn-On
EnableTurn-Off
CIN = 1µF Ceramic
COUT = 1µF Ceramic
CBYP = 0.01µF
VIN = VOUT + 1V
VOUT = 2.8V
CIN = 1µF Ceramic
COUT = 1µF Ceramic
CBYP = 0.01µF
VIN = VOUT + 1V
VOUT = 2.8V
TIME (10µs/div)
TIME (500µs/div)
Load Transient Response
Line Transient Response
5V
3.3V
150mA
100µA
COUT = 1µF Ceramic
CBYP = 0.01µF
Load = 100µA
VOUT = 3.0V
CIN = 1µF Ceramic
COUT = 1µF Ceramic
CBYP = 0.01µF
VIN = VOUT + 1V
VOUT = 3.0V
TIME (100µs/div)
TIME (500µs/div)
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MIC5259
Micrel, Inc.
Block Diagram
IN
Startup/
Shutdown
Control
Quickstart/
Noise
Cancellation
Reference
Voltage
EN
BYP
OUT
FAULT
Thermal
Sensor
Error
Amplifier
Current
Amplifier
Under-
voltage
Lockout
ACTIVE SHUTDOWN
GND
May 2005
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MIC5259
Micrel, Inc.
No-Load Stability
Applications Information
The MIC5259 will remain stable and in regulation with no
load unlike many other voltage regulators. This is especially
important in CMOS RAM keep-alive applications.
Enable/Shutdown
The MIC5259 comes with an active-high enable pin that al-
lows the regulator to be disabled. Forcing the enable pin low
disables theregulator andsendsitintoa“zero”off-mode-cur-
rent state. In this state, current consumed by the regulator
goes nearly to zero. Forcing the enable pin high enables
the output voltage. This part is CMOS and the enable pin
cannot be left floating; a floating enable pin may cause an
indeterminate state on the output.
Thermal Considerations
The MIC5259 is designed to provide 300mA of continuous
current in a very small package. Maximum power dissipation
canbecalculatedbasedontheoutputcurrentandthevoltage
drop across the part. To determine the maximum power dis-
sipation of the package, use the junction-to-ambient thermal
resistance of the device and the following basic equation:
Input Capacitor
T (max) −T
J
A
The MIC5259 is a high performance, high bandwidth device.
Therefore,itrequiresawell-bypassedinputsupplyforoptimal
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 type capacitors, help filter out high frequency noise
and are good practice in any RF based circuit.
P (max) =
D
θ
JA
T (max) is the maximum junction temperature of the die,
125°C, and T is the ambient operating temperature. θ is
layout dependent; Table 1 shows examples of junction-to-
ambient thermal resistance for the MIC5259.
J
A
JA
Package
θ
JA Recommended
θJA 1” Square
θJC
Minimum Footprint
Copper Clad
Output Capacitor
SOT-23-5
(M5 or D5)
235°C/W
185°C/W
145°C/W
The MIC5259 requires an output capacitor for stability. The
designrequires1µForgreaterontheoutputtomaintainstabil-
ity.Thedesignisoptimizedforusewithlow-ESRceramicchip
capacitors. High ESR capacitors may cause high frequency
oscillation. The maximum recommended ESR is 300mΩ.
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.
MLF (ML)
90°C/W
Table 1. Thermal Resistance
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
Substituting P (max) for P and solving for the operating
X7R/X5R dielectric-type ceramic capacitors are recom-
mendedbecauseoftheirtemperatureperformance.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 operat-
ing 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.
D
D
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit. For
example, when operating the MIC5259-2.8BML at 70°C with
a minimum footprint layout, the maximum input voltage for a
set output current can be determined as follows:
125°C − 70°C
P (max) =
D
90°C/W
P (max) = 611mW
D
The junction-to-ambient thermal resistance for the minimum
footprint is 90°C/W, from Table 1. The maximum power dis-
sipation must not be exceeded for proper operation. Using
the output voltage of 2.8V and an output current of 200mA,
the maximum input voltage can be determined. Because this
deviceisCMOSandthegroundcurrentistypically110µAover
theloadrange,thepowerdissipationcontributedbytheground
current is <1% and can be ignored for this calculation.
Bypass Capacitor
A capacitor is required from the noise bypass pin to ground
to reduce output voltage noise. The capacitor bypasses
the internal reference. A 0.01µF capacitor is recommended
for applications that require low-noise outputs. The bypass
capacitor can be increased, further reducing noise and im-
proving PSRR. Turn-on time increases slightly with respect
to bypass capacitance. A unique quick-start circuit allows
the MIC5259 to drive a large capacitor on the bypass pin
without significantly slowing turn-on time. Refer to the “Typi-
cal Characteristics” section for performance with different
bypass capacitors.
611mW = (V – 2.8V)200mA
IN
611mW = V × 200mA – 560mW
IN
1171mW = V × 200mA
IN
V (max) = 5.85V
IN
Active Shutdown
Therefore, a 2.8V application at 200mAof output current can
acceptamaximuminputvoltageof5.85VinanMLFpackage.
For a full discussion of heat sinking and thermal effects on
voltage regulators, refer to the “Regulator Thermals” section
of Micrel’s Designing with Low-Dropout Voltage Regulators
handbook.
The MIC5259 also features an active shutdown clamp, which
is an N-Channel MOSFET that turns on when the device is
disabled. This allows the output capacitor and load to dis-
charge, de-energizing the load.
M9999-051305
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May 2005
MIC5259
Micrel, Inc.
Package Information
All Dimensions are in millimeters
Thin SOT-23-5 (D5)
TOP VIEW
BOTTOM VIEW
Rev. 01
SIDE VIEW
6-Pin MLF™ (ML)
MICREL, INC. 2180 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.
May 2005
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M9999-051305
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