MIC5524
High-Performance 500mA LDO
in Thin DFN Package
General Description
The MIC5524 is a low-power, µCap, low dropout regulator
designed for optimal performance in a very-small footprint.
It is capable of sourcing 500mA of output current and only
draws 38µA of operating current to do so. The MIC5524
includes an auto-discharge feature on the output that is
activated when the enable pin is low and it has an internal
pull down resistor on the enable pin that will disable the
output when the enable pin is left floating, this is ideal for
applications where the control signal is floating during
processor boot up.
This high-performance LDO offers fast transient response
and good PSRR in a 1mm × 1mm Thin (0.4mm ht.) DFN
package.
Ideal for battery-operated applications, the MIC5524 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
MIC5524 can be put into a zero-off-mode current state,
drawing no current when disabled.
The MIC5524 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 MIC5524 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.
Features
•
•
•
•
•
•
•
•
•
•
•
Input voltage range: 2.5V to 5.5V
Fixed output voltages down to 1.0V
500mA guaranteed output current
High output initial accuracy (±1%)
High PSRR 80dB
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
4-pin 1mm x 1mm Thin DFN package
Applications
•
•
•
•
Portable communication equipment
DSC, GPS, PMP, and PDAs
Portable medical devices
5V POL applications
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
May 15, 2013
Revision 1.0
Micrel, Inc.
MIC5524
Ordering Information
Part Number
MIC5524-1.2YMT
MIC5524-1.8YMT
MIC5524-2.8YMT
MIC5524-3.0YMT
MIC5524-3.3YMT
Note:
1. Other voltages available. Contact Micrel for details.
2. Thin DFN ▲ = Pin 1 identifier.
3. Thin DFN is a GREEN, RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Marking
Code
C9
C6
4C
3C
C3
Output
(1)
Voltage
1.2V
1.8V
2.8V
3.0V
3.3V
Temperature 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
Package
(2, 3)
4-Pin 1mm × 1mm TDFN
4-Pin 1mm × 1mm TDFN
4-Pin 1mm × 1mm TDFN
4-Pin 1mm × 1mm TDFN
4-Pin 1mm × 1mm TDFN
Pin Configuration
4-Pin 1mm × 1mm Thin DFN (MT)
(Top View)
Pin Description
Pin Number
1
2
3
4
EP
Pin Name
VOUT
GND
EN
VIN
ePad
Pin Function
Output Voltage. When disabled the MIC5524 switches in an internal 25Ω load to discharge the
external capacitors.
Ground.
Enable Input. Active High. High = ON; Low = OFF. The MIC5524 has an internal 4MΩ pulldown
and this pin can be left floating.
Supply Input.
Exposed Heatsink Pad. Connect to GND.
May 15, 2013
2
Revision 1.0
Micrel, Inc.
MIC5524
Absolute Maximum Ratings
(4)
Supply Voltage (V
IN
) .......................................... –0.3V to 6V
Enable Voltage (V
EN
). ........................................ –0.3V to V
IN
(6)
Power Dissipation (P
D
) ........................... Internally Limited
Lead Temperature (soldering, 10s) ............................ 260°C
Junction Temperature (T
J
) ........................ –40°C to +150°C
Storage Temperature (T
s
) ......................... –65°C to +150°C
(7)
ESD Rating .................................................................. 3kV
Operating Ratings
(5)
Supply Voltage (V
IN
) ......................................... 2.5V to 5.5V
Enable Voltage (V
EN
) .............................................. 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Junction Thermal Resistance
1mm × 1mm Thin DFN-4 (θ
JA
) ......................... 250°C/W
Electrical Characteristics
(8)
V
IN
= V
EN
= V
OUT
+ 1V; C
IN
= C
OUT
= 2.2µF; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C to 125°C, unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(9)
Condition
Variation from nominal V
OUT
Variation from nominal V
OUT
V
IN
= V
OUT
+1V to 5.5V; I
OUT
= 100µA
I
OUT
= 100µA to 500mA
I
OUT
= 150mA
I
OUT
= 500mA
(11)
Min.
–2.0
–3.0
Typ.
±1
0.02
10
80
260
38
42
0.05
80
65
Max.
+2.0
+3.0
0.3
175
500
55
1
Units
%
%/V
mV
mV
µA
µA
dB
dB
mA
µV
RMS
Ω
(10)
Ground Pin Current
I
OUT
= 0mA
I
OUT
= 500mA
V
EN
= 0V
f = 100Hz
f = 1kHz
V
OUT
= 0V
f =10Hz to 100kHz
V
EN
= 0V; V
IN
= 3.6V
I
OUT
= –3mA
525
Ground Pin Current in Shutdown
Ripple Rejection
Current Limit
Output Voltage Noise
Auto-Discharge NFET Resistance
Enable Input
Enable Pulldown Resistor
Enable Input Voltage
Enable Input Current
Turn-On Time
Notes:
800
80
25
4
Logic Low
Logic High
V
EN
= 0V
V
EN
= 5.5V
I
OUT
= 150mA
1.2
0.01
1.4
50
1
2
125
0.2
MΩ
V
µA
µs
4. Exceeding the absolute maximum rating can damage the device.
5.
6.
7.
8.
9.
The device is not guaranteed to function outside its operating rating.
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.
Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
Specification for packaged product only.
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.
10. 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.
11. 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.
May 15, 2013
3
Revision 1.0
Micrel, Inc.
MIC5524
Typical Characteristics
Power Supply
Rejection Ratio
-100
-90
260
240
220
200
180
160
140
120
100
80
60
40
20
0
0
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
50 100 150 200 250 300 350 400 450 500
Dropout Voltage
vs. Output Current
350
Dropout Voltage
vs.Temperature
500mA
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
-80
-70
100µA
300
250
200
150
100
50
0
-40
-20
0
20
40
60
80
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
50mA
300mA
PSRR (dB)
I
OUT
= 150mA
-60
-50
-40
-30
-20
-10
0
10
1k
100k
1
1M
10,000,000
100 1,000 10,000100,000,000,000
10M
100
10k
C
OUT
= 2.2µF
C
IN
= 2.2µF
V
IN
= 4.3V
V
OUT
= 3.3V
I
OUT
= 300mA
500mA
FREQUENCY (Hz)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Ground Current
vs. Supply Voltage
55
50
46
45
Ground Current
vs. Load Current
50
48
Ground Current
vs. Temperature
300mA
GROUND CURRENT (µA)
GROUND CURRENT (µA)
44
43
42
41
40
39
38
37
36
V
IN
= V
EN
= V
OUT
+ 1
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
0
50 100 150 200 250 300 350 400 450 500
GROUND CURRENT (µA)
46
500mA
44
42
40
38
36
34
32
30
-40
-20
0
20
40
60
80
100µA
45
40
35
500mA
100µA
30
25
20
2.5
3
3.5
4
4.5
5
5.5
V
EN
= V
IN
= V
OUT
+ 1
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
V
IN
= V
EN
= V
OUT
+ 1V
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
SUPPLY VOLTAGE (V)
LOAD CURRENT (mA)
TEMPERATURE (°C)
Output Voltage
vs. Output Current
3.50
3.45
3.5
3.4
Output Voltage
vs.Supply Voltage
3.5
Output Voltage
vs.Temperature
V
IN
= V
OUT
+ 1V
V
OUT
= 3.3V
C
IN
=C
OUT
= 2.2µF
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.40
3.35
3.30
3.25
3.20
3.15
3.10
0
100
200
300
400
500
V
IN
= V
EN
= V
OUT
+ 1V
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
2.5
50mA
OUTPUT VOLTAGE (V)
3.3
3.45
3.4
300mA
3.35
500mA
3.3
500mA
V
IN
= V
EN
= V
OUT
+ 1
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
4.0
4.5
5.0
5.5
3.25
300mA
3.2
3.0
3.5
-40
-20
0
20
40
60
80
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
May 15, 2013
4
Revision 1.0
Micrel, Inc.
MIC5524
Typical Characteristics (Continued)
Output Noise Spectral Density
(MIC5524-3.3YMT)
10
1
NOISE µV/√Hz
0.1
0.01
V
IN
= V
EN1
= 4.5V
C
OUT
= 2.2µF
V
OUT
= 3.3V
0.001
10
100
1K
10K
100K
1M
10M
FREQUENCY (Hz)
May 15, 2013
5
Revision 1.0
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