MIC5319
500mA µCap Ultra-Low Dropout
High PSRR LDO Regulator
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
General Description
The MIC5319 is a high-performance, 500mA LDO
regulator, offering extremely high PSRR and very-low
noise while consuming low ground current.
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.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
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
Logic-controlled Enable
Tiny 2mm x 2mm MLF® package, 500mA continuous
Thin SOT-23-5 package, 500mA peak
Applications
Cellular phones
PDAs
Fiber optic modules
Portable electronics
Notebook PCs
Audio Codec power supplies
Typical Application
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Ordering Information
Part Number Marking(1) Voltage(2) (V) Junction
Temperature Range Package Lead Finish
MIC5319-1.3HYML H13 1.375 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-1.8YML 891 1.8 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-1.85YML J91 1.85 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-2.5YML 592 2.5 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-2.6YML 692 2.6 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-2.7YML 792 2.7 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-2.8YML 892 2.8 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-2.85YML J92 2.85 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-2.9YML 992 2.9 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-3.0YML 093 3.0 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-3.3YML 393 3.3 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-5.0YML 095 5.0 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319YML A9A ADJ 40°C to +125°C 6-Pin 2mm × 2mm MLF® Pb-Free
MIC5319-1.3HYD5 N13H 1.375 40°C to +125°C Thin SOT-23-5 Pb-Free
MIC5319-1.8YD5 N918 1.8 40°C to +125°C Thin SOT-23-5 Pb-Free
MIC5319-1.85YD5 N91J 1.85 40°C to +125°C Thin SOT-23-5 Pb-Free
MIC5319-2.5YD5 N925 2.5 40°C to +125°C Thin SOT-23-5 Pb-Free
MIC5319-2.6YD5 N926 2.6 40°C to +125°C Thin SOT-23-5 Pb-Free
MIC5319-2.7YD5 N927 2.7 40°C to +125°C Thin SOT-23-5 Pb-Free
MIC5319-2.8YD5 N928 2.8 40°C to +125°C Thin SOT-23-5 Pb-Free
MIC5319-2.9YD5(3) N929 2.9 40°C to +125°C Thin SOT-23-5 Pb-Free
MIC5319-3.0YD5 N930 3.0 40°C to +125°C Thin SOT-23-5 Pb-Free
MIC5319-3.3YD5 N933 3.3 40°C to +125°C Thin SOT-23-5 Pb-Free
MIC5319-5.0YD5 N950 5.0 40°C to +125°C Thin SOT-23-5 Pb-Free
Notes:
1. Under-bar/Over-bar symbols may not be to scale.
2. For other output voltage options, contact Micrel Marketing.
3. Contact Micrel Marketing for availability.
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Pin Configur ation
MIC5319 (Fixed)
6-Pin 2mm × 2mm MLF (ML)
Top View
MIC5319 (Adjustable)
6-Pin 2mm × 2mm MLF (ML)
Top View
MIC5319 (Adjustable)
TSOT-23-5 (D5)
Top View
Pin Description
Pin Number
MLF-6
Fixed
Pin Number
MLF-6
Adjustable
Pin Number
TSOT-23-5
Fixed Pin Name Pin Name
1 1 3 EN
Enable Input: Active High. High = ON, Low = OFF. Do not leave
floating.
2 2 2 GND Ground.
3 3 1 VIN Supply Input.
4 4 5 VOUT Output Voltage.
5 ADJ Adjustable Input: Connect to external resistor voltage divider
network.
5 NC No connection for fixed voltage parts
6 6 4 BYP
Reference Bypass: Connect external 0.1µF to GND for reduced
output noise. May be left open.
EP EP ePad Exposed Heatsink Pad connected to ground internally
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Absolute Maximum Ratings(1)
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
Operating Ratings(2)
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(5)
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. Typ. Max. Units
Variation from nominal VOUT 1.0 +1.0
Output Voltage Accuracy
Variation from nominal VOUT, IOUT = 100mA to 500mA 2.0 +2.0 %
1.2375 1.25 1.2625 Feedback Voltage
(ADJ Option) 1.225 1.25 1.275 V
Line Regulation VIN = VOUT +1V to 5.5V 0.04
0.3 %/V
Load Regulation(6) I
OUT = 100µA to 500mA 0.1 0.5 %
IOUT = 50mA 20 40
Dropout Voltage(7, 8) IOUT = 500mA 200 400 mV
Ground Pin Current(9) I
OUT = 0 to 500mA 90 150 µA
Ground Pin Current in
Shutdown VEN 0.2V 0.5 µA
f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 0.1 µF 70
Ripple Rejection f = 10kHz; COUT = 2.2µF ceramic; CBYP = 0.1 µF 60 dB
Current Limit VOUT = 0V 600 700 mA
Output Voltage Noise COUT = 2.2µF; CBYP = 0.1 µF; 10Hz to 100kHz 40 µVrms
Turn-On Time COUT = 2.2µF; CBYP = 0.1 µF 40 100 µs
Logic Low (Regulator Shutdown) 0.2
Enable Input Voltage Logic High (Regulator Enabled) 1.2 V
VIL = 0.2V (Regulator Shutdown) 0.01
1
Enable Input Current
VIH = 1.0V (Regulator Shutdown) 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 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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Typical Characteristics
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Typical Characteristics (Continued)
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Functional Characteristics
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Functional Diagram
MIC5319 Block Diagram Fixed
MIC5319 Block Diagram Adjustable
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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.
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.
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.
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.
Bypass Capacitor
A capacitor can be placed from the bypass pin-to-ground
to reduce output voltage noise. The capacitor bypasses
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.
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.
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.
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:
VOUT = VREF
+R2
R1
1
VREF = 1.25V
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:
PD = (VIN VOUT)IOUT + VIN × IGND
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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
0.25W = C/W93
TC125 A
°
°
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:
PD(max) =
JA
AJ
θ
T(max)T
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.
Package θJA Recommended
Minimum Footprint θJC
2mm × 2mm MLF® 93°C/W 45°C/W
Thin SOT-23-5 235°C/W
Table 1. Thermal Resistan ce
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Package Information
6-Pin 2mm × 2mm MLF® (ML)
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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
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
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relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
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