MIC5528
High-Performance 500mA LDO
in Thin and Extra Thin DFN Packages
General Description
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.
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.
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.
Features
•
•
•
•
•
•
•
•
•
•
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
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 5, 2014
Revision 1.1
Micrel, Inc.
MIC5528
Ordering Information
Part Number
MIC5528-3.3YMT
MIC5528-2.8YMX
MIC5528-3.3YMX
Notes:
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.
Marking
Code
CF
CI
CF
Output
(1)
Voltage
3.3V
2.8V
3.3V
Auto-
Discharge
YES
YES
YES
EN
Pulldown
YES
YES
YES
Temperature
Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
(2,
3, 4)
6-Pin 1.2mm × 1.2mm TDFN
6-Pin 1.2mm × 1.2mm XTDFN
6-Pin 1.2mm × 1.2mm XTDFN
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 Number
1, 2
3
4
5
6
EP
Pin Name
XTDFN-6
VOUT
GND
EN
NC
VIN
ePad
Pin Function
Output Voltage. When disabled the MIC5528 switches in an internal 25Ω load to discharge the
external capacitors.
Ground.
Enable Input: Active High. High = ON; Low = OFF. The MIC5528 has an internal pulldown and
this pin can be left floating.
No Connection.
Supply Input.
Exposed Heatsink Pad. Connect to GND for best thermal performance.
May 5, 2014
2
Revision 1.1
Micrel, Inc.
MIC5528
Absolute Maximum Ratings
(5)
Supply Voltage (V
IN
) .......................................... –0.3V to 6V
Enable Voltage (V
EN
). ........................................ –0.3V to V
IN
(7)
Power Dissipation (P
D
) ........................... Internally Limited
Lead Temperature (soldering, 10sec) ........................ 260°C
Junction Temperature (T
J
) ........................ –40°C to +150°C
Storage Temperature (T
s
) ......................... –65°C to +150°C
(8)
ESD Rating .................................................................. 3kV
Operating Ratings
(6)
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
1.2mm × 1.2mm Extra Thin DFN-6 (θ
JA
) ......... 173°C/W
Electrical Characteristics
(9)
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 +85°C, unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(10)
Condition
Variation from nominal V
OUT
Variation from nominal V
OUT
; –40°C to +85°C
V
IN
= V
OUT
+1V to 5.5V; I
OUT
= 100µA
I
OUT
= 100µA to 500mA
I
OUT
= 150mA
I
OUT
= 500mA
(12)
Min.
–2.0
–3.0
Typ.
±1
0.02
14
80
260
38
42
0.05
70
60
Max.
+2.0
+3.0
0.3
65
180
500
55
65
1
Units
%
%/V
mV
mV
µA
µA
dB
dB
mA
µV
RMS
Ω
MΩ
(11)
Ground Pin Current
I
OUT
= 0mA
I
OUT
= 500mA
V
EN
= 0V
f = 100Hz, I
OUT
= 100mA
f = 1kHz, I
OUT
= 100mA
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
175
25
4
Logic Low
Logic High
V
EN
= 0V
V
EN
= 5.5V
I
OUT
= 150mA
1.2
0.01
1.4
50
0.2
1
2
125
V
µA
µs
5. Exceeding the absolute maximum rating can damage the device.
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.
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.
May 5, 2014
3
Revision 1.1
Micrel, Inc.
MIC5528
Typical Characteristics
Dropout Voltage vs.
Output Current
260
240
220
200
180
160
140
120
100
80
60
40
20
0
0
50 100 150 200 250 300 350 400 450 500
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
350
300
250
200
150
100
50
0
-40
-20
0
20
40
60
80
500mA
Dropout Voltage
vs.Temperature
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
300mA
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
50mA
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Ground Current
vs. Supply Voltage
55
46
45
Ground Current
vs. Load Current
50
48
Ground Current
vs. Temperature
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)
50
45
40
35
100µA
30
25
20
2.5
3
3.5
4
4.5
5
5.5
V
EN
= V
IN
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
46
44
42
300mA
40
38
36
34
32
30
-40
-20
0
20
40
60
80
V
IN
= V
EN
= V
OUT
+ 1V
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
100µA
500mA
500mA
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
3.45
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
3.4
V
IN
= V
OUT
+ 1V
V
OUT
= 3.3V
C
IN
=C
OUT
= 2.2µF
300mA
3.35
300mA
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
3.2
3.0
3.5
-40
-20
0
20
40
60
80
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
May 5, 2014
4
Revision 1.1
Micrel, Inc.
MIC5528
Typical Characteristics (Continued)
Current Limit
vs. Supply Voltage
750
700
10
Output Noise Spectral Density
(MIC5528-3.3YMT)
CURRENT LIMIT (mA)
650
600
550
500
450
400
350
300
2.5
3
3.5
4
4.5
5
5.5
V
OUT
= 3.3V
C
IN
= C
OUT
= 2.2µF
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
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
May 5, 2014
5
Revision 1.1
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