MIC5319-5.0YD5 [MICREL]
500mA μCap Ultra-Low Dropout High PSRR LDO Regulator; 500毫安μCap超低压差高PSRR LDO稳压器
| 型号： | MIC5319-5.0YD5 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 500mA μCap Ultra-Low Dropout High PSRR LDO Regulator |
| 文件： | 总12页 (文件大小：872K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5319
500mA µCap Ultra-Low Dropout
High PSRR LDO Regulator
General Description
Features
The MIC5319 is a high-performance, 500mA LDO
regulator, offering extremely high PSRR and very-low
noise while consuming low ground current.
• Ultra-low dropout voltage 200mV @ 500mA
• Input voltage range: 2.5 to 5.5V
• Stable with ceramic output capacitor
• Low output noise: 40µVrms
• Low quiescent current of 90µA total
• High PSRR, up to 70dB @1kHz
• Fast turn-on-time: 40µs typical
• High-output accuracy:
− ±1.0% initial accuracy
− ±2.0% over temperature
• Thermal-shutdown protection
• Current-limit protection
Ideal for battery-operated applications, the MIC5319
features 1% accuracy, extremely low-dropout voltage
(200mV @ 500mA), and low ground current at light load
(typically 90µA). Equipped with a logic-compatible enable
pin, the MIC5319 can be put into a zero-off-mode current
state, drawing no current when disabled.
The MIC5319 is a µCap design operating with very-small
ceramic output capacitors for stability, thereby reducing
required board space and component cost.
The MIC5319 is available in fixed-output voltages and
adjustable output voltages in the super-compact 2mm x
2mm MLF® leadless package and thin SOT-23-5 package.
• Logic-controlled Enable
• Tiny 2mm x 2mm MLF® package, 500mA continuous
• Thin SOT-23-5 package, 500mA peak
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Applications
• Cellular phones
• PDAs
• Fiber optic modules
• Portable electronics
• Notebook PCs
• Audio Codec power supplies
Typical 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
M9999-052510
May 2010
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MIC5319
Ordering Information
Voltage(2)
(V)
Part Number
Marking
Pb-Free(1)
Junction
Temperature
Range
Package
Standard
Pb-Free
Standard
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
6-Pin 2mm × 2mm MLF®
MIC5319-1.3HYML
MIC5319-1.8YML
MIC5319-1.85YML
MIC5319-2.5YML
MIC5319-2.6YML
MIC5319-2.7YML
MIC5319-2.8YML
MIC5319-2.9YML
MIC5319-3.0YML
MIC5319-3.3YML
MIC5319-5.0YML
MIC5319YML
−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
1.375
1.8
13H
918
91J
925
926
927
928
929
930
933
950
MIC5319-1.8BML
MIC5319-2.5BML
918
1.85
2.5
925
2.6
2.7
MIC5319-2.8BML
928
2.8
2.9
3.0
MIC5319-3.3BML
MIC5319-5.0BML
MIC5319BML
933
950
9AA
3.3
5.0
ADJ
9AA
MIC5319-1.3HYD5
MIC5319-1.8YD5
MIC5319-1.85YD5
MIC5319-2.5YD5
MIC5319-2.6YD5
MIC5319-2.7YD5
MIC5319-2.8YD5
MIC5319-2.9YD5
MIC5319-3.0YD5
MIC5319-3.3YD5
MIC5319-5.0YD5
N13H
N918
N91J
N925
N926
N927
N928
N929
N930
N933
N950
1.375
1.8
Thin SOT-23-5
Thin SOT-23-5
Thin SOT-23-5
Thin SOT-23-5
Thin SOT-23-5
Thin SOT-23-5
Thin SOT-23-5
Thin SOT-23-5
Thin SOT-23-5
Thin SOT-23-5
Thin SOT-23-5
−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
1.85
2.5
2.6
2.7
MIC5319-2.8BD5
N928
N933
2.8
2.9
3.0
MIC5319-3.3BD5
3.3
5.0
Notes:
1. Under-bar/Over-bar symbols may not be to scale.
2. For other output voltage options, contact Micrel Marketing.
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Micrel, Inc.
MIC5319
Pin Configuration
MIC5319-x.xBML/YML
MIC5319BML/YML (Adjustable)
6-Pin 2mm × 2mm MLF® (ML)
Top View
MIC5319-x.xBD5/YD5
6-Pin 2mm × 2mm MLF® (ML)
TSOT-23-5 (D5)
Top View
Top View
Pin Description
Pin Number
Pin Number
Pin Number
TSOT-23-5
Fixed
MLF®-6
MLF®-6
Pin Name
Pin Name
Fixed
Adjustable
Enable Input: Active High. High = ON, Low = OFF. Do not leave
floating.
1
1
3
EN
2
3
4
2
3
4
2
1
5
GND
VIN
Ground.
Supply Input.
Output Voltage.
VOUT
Adjustable Input: Connect to external resistor voltage divider
network.
5
ADJ
−
−
5
6
NC
No connection for fixed voltage parts
−
6
4
BYP
Reference Bypass: Connect external 0.1µF to GND for reduced
output noise. May be left open.
HS Pad
HS pad
EPAD
Exposed Heatsink Pad connected to ground internally
−
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Micrel, Inc.
MIC5319
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, 5sec.)......................... 260°C
ESD Rating(4)..................................................................3kV
Supply Input Voltage (VIN)............................ +2.5V to +5.5V
Enable Input Voltage (VEN)..................................... 0V to VIN
Junction Temperature (TJ) ........................ −40°C to +125°C
Package Thermal Resistance
MLF® (θJA)..........................................................93°C/W
TSOT-23 (θJA)..................................................235°C/W
Electrical Characteristics(4)
VIN = VOUT +1.0V; COUT = 2.2µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted.
Parameter
Condition
Min.
−1.0
Typ.
Max.
+1.0
+2.0
1.2625
1.275
0.3
Units
Variation from nominal VOUT
Variation from nominal VOUT, IOUT = 100mA to 500mA
Output Voltage Accuracy
%
−2.0
Feedback Voltage
(ADJ Option)
1.2375
1.225
1.25
1.25
0.04
0.1
V
Line Regulation
Load Regulation(6)
%/V
%
VIN = VOUT +1V to 5.5V
IOUT = 100µA to 500mA
IOUT = 50mA
0.5
20
40
Dropout Voltage(7, 8)
Ground Pin Current(9)
mV
IOUT = 500mA
200
90
400
IOUT = 0 to 500mA
150
µA
µA
Ground Pin Current in
Shutdown
0.5
VEN ≤ 0.2V
f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 0.1 µF
f = 10kHz; COUT = 2.2µF ceramic; CBYP = 0.1 µF
VOUT = 0V
70
60
Ripple Rejection
dB
Current Limit
600
1.2
700
40
mA
µVrms
µs
Output Voltage Noise
Turn-On Time
COUT = 2.2µF; CBYP = 0.1 µF; 10Hz to 100kHz
COUT = 2.2µF; CBYP = 0.1 µF
40
100
0.2
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
Enable Input Voltage
V
0.01
0.01
1
1
VIL = ≤ 0.2V (Regulator Shutdown)
VIH = ≥ 1.0V (Regulator Shutdown)
Enable Input Current
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 may 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.
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 2.5V,
dropout voltage spec does not apply, as part is limited by minimum VIN spec of 2.5V. There may be some typical dropout degradation at VOUT <3V.
8. For ADJ option, VOUT = 3V for dropout specification.
9. 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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May 2010
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Micrel, Inc.
MIC5319
Typical Characteristics
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Micrel, Inc.
MIC5319
Typical Characteristics (Continued)
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Micrel, Inc.
MIC5319
Functional Characteristics
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Micrel, Inc.
MIC5319
Functional Diagram
MIC5319 Block Diagram − Fixed
MIC5319 Block Diagram − Adjustable
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Micrel, Inc.
MIC5319
A unique, quick-start circuit allows the MIC5319 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.
Applications Information
Enable/Shutdown
The MIC5319 features 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, as this may cause an
indeterminate state on the output.
No-Load Stability
Unlike many other voltage regulators, the MIC5319 will
remain stable and in regulation with no load. This is
especially important 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.
Input Capacitor
The MIC5319 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.
The MIC5319 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:
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 design practice in any RF-based
circuit.
R1
R2
⎛
⎞
⎟
VOUT = VREF 1+
⎜
⎝
⎠
VREF = 1.25V
Output Capacitor
The MIC5319 requires an output capacitor of 2.2µF 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 2.2µF 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.
Figure 1. Adjustable Voltage Application
Thermal Considerations
The MIC5319 is designed to provide 500mA of
continuous current in a very small MLF® package.
Maximum ambient operating temperature can be
calculated based on the output current and the voltage
drop across the part. Given an input voltage of 3.3V,
output voltage of 2.8V and output current = 500mA, the
actual power dissipation of the regulator circuit can be
determined using the equation:
Bypass Capacitor
A capacitor can be placed from the bypass pin-to-ground
to reduce output voltage noise. The capacitor bypasses
PD = (VIN − VOUT)IOUT + VIN × IGND
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.
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Micrel, Inc.
MIC5319
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:
Substituting 0.25W for PD(max) and solving for the
ambient operating temperature will give the maximum
operating conditions for the regulator circuit. The
maximum power dissipation must not be exceeded for
proper operation.
PD = (3.3V − 2.8V) × 500mA
125°C− TA
0.25W =
93°C/W
PD = 0.25W
TA = 101.75°C
Therefore, a 2.8V application at 500mA of output current
can accept an ambient operating temperature of
101.75°C in a 2mm x 2mm MLF® 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 Low-Dropout Voltage Regulators
handbook. This information can be found on Micrel's
website at: www.micrel.com/_PDF/other/LDOBk_ds.pdf
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:
TJ(max)− TA
⎛
⎜
⎞
⎟
PD(max) =
θJA
⎝
⎠
TJ(max) = 125°C, the maximum junction temperature of
the die. θJA thermal resistance = 93°C/W.
Table 1 shows junction-to-ambient thermal resistance for
the MIC5319 in the 2mm x 2mm MLF® package.
θ
JA Recommended
Minimum Footprint
Package
θJC
2mm × 2mm MLF®
93°C/W
45°C/W
SOT-23-5
235°C/W
Table 1. Thermal Resistance
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MIC5319
Package Information
6-Pin 2mm × 2mm MLF® (ML)
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Micrel, Inc.
MIC5319
Package Information (Continued)
TSOT-23-5 (D5)
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 a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2010 Micrel, Incorporated.
M9999-052510
May 2010
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