MIC5528-3.3YMT-TR [MICROCHIP]
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| 型号： | MIC5528-3.3YMT-TR |
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MICROCHIP |
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MIC5528
High-Performance 500mA LDO
in Thin and Extra Thin DFN Packages
General Description
Features
The MIC5528 is a low-power, µCap, low dropout regulator
designed for optimal performance in a very-small footprint.
It is capable of sourcing up to 500mA of output current
while only drawing 38µA of operating current. This high-
performance LDO is a µCap design in a thermally
enhanced 1.2mm × 1.2mm extra thin (0.4mm ht.) DFN
package. It operates with small ceramic output capacitor
for stability, thereby reducing required board space.
• Input voltage range: 2.5V to 5.5V
• Fixed output voltages down to 1.0V
• ±2% Room temperature accuracy
• Low quiescent current 38µA
• Stable with 2.2µF ceramic output capacitors
• Low dropout voltage 260mV @ 500mA
• Auto discharge and internal enable pulldown
• Thermal-shutdown and current-limit protection
• 6-pin 1.2mm × 1.2mm extra thin DFN package
• 6-pin 1.2mm × 1.2mm thin DFN package
Ideal for battery-operated applications, the MIC5528 offers
±2% accuracy, extremely low dropout voltage (260mV @
500mA), and can regulate output voltages down to 1.0V.
Equipped with a TTL logic-compatible enable pin, the
MIC5528 can be put into a zero-off-mode current state,
drawing no current when disabled.
Applications
• Portable communication equipment
• DSC, GPS, PMP, and PDAs
• Portable medical devices
• 5V POL applications
The MIC5528 is a µCap design, operating with very small
ceramic output capacitors for stability, reducing required
board space and component cost for space-critical
applications. The MIC5528 has an operating junction
temperature range of –40°C to 125°C.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Revision 1.1
May 5, 2014
Micrel, Inc.
MIC5528
Ordering Information
Marking
Part Number
Output
Auto-
Discharge
EN
Pulldown
Temperature
Range
Package(2, 3, 4)
Code
Voltage(1)
MIC5528-3.3YMT
MIC5528-2.8YMX
MIC5528-3.3YMX
Notes:
CF
CI
3.3V
2.8V
3.3V
YES
YES
YES
YES
YES
YES
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
6-Pin 1.2mm × 1.2mm TDFN
6-Pin 1.2mm × 1.2mm XTDFN
6-Pin 1.2mm × 1.2mm XTDFN
CF
1. Other voltages available. Contact Micrel for details.
2. Thin DFN ▲ = Pin 1 identifier.
3. Extra Thin DFN ▼ = Pin 1 identifier.
4. Extra Thin and Thin DFN are GREEN, RoHS-compliant packages. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
6-Pin 1.2mm × 1.2mm Thin DFN (MT)
(Top View)
6-Pin 1.2mm × 1.2mm Extra Thin DFN (MX)
(Top View)
Pin Description
Pin Name
XTDFN-6
Pin Number
Pin Function
Output Voltage. When disabled the MIC5528 switches in an internal 25Ω load to discharge the
external capacitors.
1, 2
3
VOUT
GND
EN
Ground.
Enable Input: Active High. High = ON; Low = OFF. The MIC5528 has an internal pulldown and
this pin can be left floating.
4
5
6
NC
VIN
No Connection.
Supply Input.
EP
ePad
Exposed Heatsink Pad. Connect to GND for best thermal performance.
Revision 1.1
May 5, 2014
2
Micrel, Inc.
MIC5528
Absolute Maximum Ratings(5)
Operating Ratings(6)
Supply Voltage (VIN).......................................... –0.3V to 6V
Enable Voltage (VEN).........................................–0.3V to VIN
Power Dissipation (PD)...........................Internally Limited(7)
Lead Temperature (soldering, 10sec)........................ 260°C
Junction Temperature (TJ) ........................–40°C to +150°C
Storage Temperature (Ts) .........................–65°C to +150°C
ESD Rating(8)..................................................................3kV
Supply Voltage (VIN)......................................... 2.5V to 5.5V
Enable Voltage (VEN).............................................. 0V to VIN
Junction Temperature (TJ) ........................–40°C to +125°C
Junction Thermal Resistance
1.2mm × 1.2mm Extra Thin DFN-6 (θJA) .........173°C/W
Electrical Characteristics(9)
VIN = VEN = VOUT + 1V; CIN = COUT = 2.2µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +85°C, unless noted.
Parameter
Condition
Min.
–2.0
–3.0
Typ.
Max.
+2.0
+3.0
0.3
Units
Variation from nominal VOUT
Variation from nominal VOUT; –40°C to +85°C
VIN = VOUT +1V to 5.5V; IOUT = 100µA
IOUT = 100µA to 500mA
±1
Output Voltage Accuracy
%
Line Regulation
Load Regulation(10)
0.02
14
%/V
mV
65
180
500
IOUT = 150mA
80
Dropout Voltage(11)
mV
µA
I
OUT = 500mA
IOUT = 0mA
OUT = 500mA
260
55
65
38
42
Ground Pin Current(12)
Ground Pin Current in Shutdown
Ripple Rejection
I
VEN = 0V
0.05
70
1
µA
dB
f = 100Hz, IOUT = 100mA
f = 1kHz, IOUT = 100mA
VOUT = 0V
60
dB
525
Current Limit
800
175
25
mA
µVRMS
Ω
Output Voltage Noise
Auto-Discharge NFET Resistance
Enable Input
f =10Hz to 100kHz
VEN = 0V; VIN = 3.6V ; IOUT = –3mA
Enable Pulldown Resistor
4
MΩ
0.2
Logic Low
Logic High
Enable Input Voltage
Enable Input Current
V
1.2
VEN = 0V
0.01
1.4
50
1
2
µA
µs
VEN = 5.5V
125
Turn-On Time
IOUT = 150mA
Notes:
5. Exceeding the absolute maximum rating can damage the device.
6. The device is not guaranteed to function outside its operating rating.
7. 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.
8. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
9. Specification for packaged product only.
10. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to heating effects are
covered by the thermal regulation specification.
11. 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 2.5V, dropout voltage is the input-to-output differential with the minimum input voltage 2.5V.
12. 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.
Revision 1.1
May 5, 2014
3
Micrel, Inc.
MIC5528
Typical Characteristics
Dropout Voltage vs.
Output Current
Dropout Voltage
vs.Temperature
260
240
220
200
180
160
140
120
100
80
350
300
250
200
150
100
50
500mA
300mA
VOUT = 3.3V
CIN = COUT = 2.2µF
60
50mA
40
VOUT = 3.3V
CIN = COUT = 2.2µF
20
0
0
0
50 100 150 200 250 300 350 400 450 500
-40
-20
0
20
40
60
80
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Ground Current
vs. Supply Voltage
Ground Current
vs. Load Current
Ground Current
vs. Temperature
55
50
46
45
44
43
42
41
40
39
38
37
36
50
48
46
44
42
40
38
36
34
32
30
500mA
45
500mA
40
300mA
100µA
35
100µA
30
VIN = VEN = VOUT + 1V
VOUT = 3.3V
CIN = COUT = 2.2µF
VIN = VEN = VOUT + 1
VOUT = 3.3V
CIN = COUT = 2.2µF
VEN = VIN
VOUT = 3.3V
CIN = COUT = 2.2µF
25
20
2.5
3
3.5
4
4.5
5
5.5
0
50 100 150 200 250 300 350 400 450 500
-40
-20
0
20
40
60
80
SUPPLY VOLTAGE (V)
LOAD CURRENT (mA)
TEMPERATURE (°C)
Output Voltage
vs.Temperature
Output Voltage
vs. Output Current
Output Voltage
vs.Supply Voltage
3.5
3.50
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
3.45
3.40
3.35
3.30
3.25
3.20
3.15
3.10
3.45
3.4
50mA
VIN = VOUT + 1V
VOUT = 3.3V
CIN =COUT = 2.2µF
3.35
3.3
300mA
300mA
VIN = VEN = VOUT+ 1V
VOUT = 3.3V
CIN = COUT = 2.2µF
500mA
3.25
3.2
VIN = VEN = VOUT + 1
VOUT = 3.3V
CIN = COUT = 2.2µF
0
100
200
300
400
500
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40
-20
0
20
40
60
80
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Revision 1.1
May 5, 2014
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Micrel, Inc.
MIC5528
Typical Characteristics (Continued)
Current Limit
vs. Supply Voltage
Output Noise Spectral Density
(MIC5528-3.3YMT)
10
750
700
650
600
550
500
450
400
350
300
1
0.1
0.01
0.001
VIN = VEN1= 4.5V
COUT = 2.2µF
VOUT = 3.3V
VOUT = 3.3V
CIN = COUT = 2.2µF
2.5
3
3.5
4
4.5
5
5.5
10
100
1K
10K
100K 1M 10M
FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
Revision 1.1
May 5, 2014
5
Micrel, Inc.
MIC5528
Functional Characteristics
Revision 1.1
May 5, 2014
6
Micrel, Inc.
MIC5528
Functional Block Diagram
Revision 1.1
May 5, 2014
7
Micrel, Inc.
MIC5528
Application Information
The MIC5528 is a high-performance, low-power 500mA
LDO. The MIC5528 includes an auto-discharge circuit
that is switched on when the regulator is disabled through
the enable pin. The MIC5528 also offers an internal
pulldown resistor on the enable pin to ensure the output
is disabled if the control signal is tri-stated. The MIC5528
regulator is fully protected from damage due to fault
conditions, offering linear current limiting and thermal
shutdown.
Enable/Shutdown
The MIC5528 comes with an active-high enable pin that
allows the regulator to be disabled. Forcing the enable
pin low disables the regulator and sends it into an off
mode current state drawing virtually zero current. When
disabled the MIC5528 switches an internal 25Ω load on
the regulator output to discharge the external capacitor.
Forcing the enable pin high enables the output voltage.
The MIC5528 has an internal pull down resistor on the
enable pin to disable the output when the enable pin is
floating.
Input Capacitor
The MIC5528 is a high-performance, high-bandwidth
device. An input capacitor of 2.2µF 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 practice in any
RF-based circuit. X5R or X7R dielectrics are
recommended for the input capacitor. Y5V dielectrics
lose most of their capacitance over temperature and are
therefore, not recommended.
Thermal Considerations
The MIC5528 is designed to provide 500mA of
continuous current in a very small package. Maximum
ambient operating temperature can be calculated based
on the output current and the voltage drop across the
part. For example if the input voltage is 3.6V, the output
voltage is 3.3V, and the output current = 500mA. The
actual power dissipation of the regulator circuit can be
determined using Equation 1:
Output Capacitor
The MIC5528 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 are not recommended because they 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.
PD = (VIN − VOUT)IOUT + VIN IGND
Eq. 1
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 Equation 2:
X7R/X5R dielectric-type ceramic capacitors are
P =
(
3.6V − 3.3V
)
×500mA
recommended
because
of
their
temperature
D
Eq. 2
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.
P = 0.150W
D
To determine the maximum ambient operating
temperature of the package, use the junction-to-ambient
thermal resistance of the device Equation 3:
T
− T
A
J(MAX)
Eq. 3
P
=
D(MAX)
θ
JA
No-Load Stability
Unlike many other voltage regulators, the MIC5528
remains stable and in regulation with no load. This is
especially important in CMOS RAM keep-alive
applications.
T
J(MAX) = 125°C, the maximum junction temperature of the
die, θJA thermal resistance = 173°C/W for the XTDFN
package.
Revision 1.1
May 5, 2014
8
Micrel, Inc.
MIC5528
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit. The junction-to-
ambient thermal resistance for the minimum footprint is
173°C/W.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC5528-3.3YMX at an
input voltage of 3.6V and a 500mA load with a minimum
footprint layout, the maximum ambient operating
temperature TA can be determined as in Equation 4:
0.15W =
(
125°C − T
)
/
(
173°C/ W
)
A
Eq. 4
T
= 99°C
A
Therefore, the maximum ambient operating temperature
allowed in a thermally enhanced 1.2mm × 1.2mm XTDFN
package is 99°C. 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:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
Revision 1.1
May 5, 2014
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Micrel, Inc.
MIC5528
Typical Application Schematic
Bill of Materials
Item
Part Number
Manufacturer Description
Qty.
C1, C2
GRM188R71A225KE15D
MIC5528-xxYMT
MIC5528-xxYMX
Murata(13)
Capacitor, 2.2µF Ceramic, 10V, X5R, Size 0603
2
High-Performance 500mA LDO in Thin and Extra Thin
DFN Packages
U1
Micrel, Inc.(14)
1
Notes:
13. Murata: www.murata.com.
14. Micrel, Inc.: www.micrel.com.
Revision 1.1
May 5, 2014
10
Micrel, Inc.
MIC5528
PCB Layout Recommendations
Top Layer
Bottom Layer
Revision 1.1
May 5, 2014
11
Micrel, Inc.
MIC5528
Package Information(15) and Recommended Landing Pattern
6-Pin 1.2mm × 1.2mm Thin DFN (MT)
Note:
15. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
Revision 1.1
May 5, 2014
12
Micrel, Inc.
MIC5528
Package Information(15) and Recommended Landing Pattern (Continued)
6-Pin 1.2mm × 1.2mm Extra Thin DFN (MX)
Revision 1.1
May 5, 2014
13
Micrel, Inc.
MIC5528
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
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
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.
© 2013 Micrel, Incorporated.
Revision 1.1
May 5, 2014
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