MIC5319
500 mA, µCap Ultra-Low Dropout Regulator with High PSRR
Features
• Ultra-Low Dropout Voltage: 200 mV @ 500 mA
• Input Voltage Range: 2.5V to 5.5V
• Output Voltage:
- Adjustable: V
REF
= 1.25V
- Fixed: 1.3V, 1.8V, 1.85V, 2.5V, 2.6V, 2.7V,
2.8V, 2.85V, 2.9V, 3.0V, 3.3V
• Stable with Low ESR Ceramic Output Capacitor
• Low Output Noise: 40 µV
RMS
(10 Hz to 100 kHz
Bandwidth)
• Low Ground Current: 90 µA Typical
• High PSRR, up to 70 dB @ 1 kHz
• Fast Turn-On Time: 40 µs Typical
• High Output Accuracy:
- ±1.0% Initial Accuracy
- ±2.0% Over Temperature
• Thermal-Shutdown Protection
• Current-Limit Protection
• Logic-Controlled Enable Input Pin
• Available Packages:
- 2 mm x 2 mm DFN, 500 mA Continuous
- SOT23-5, 500 mA Peak
General Description
The MIC5319 is a high performance, 500 mA LDO
regulator, with high PSRR and very low noise, with low
ground current.
Ideal for battery-operated applications, the MIC5319
features 1% accuracy, very low dropout voltage
(typically 200 mV @ 500 mA), and low ground current
at light load (typically 90 µA). Equipped with a
logic-compatible enable pin, the MIC5319 can be set
into a zero-off-mode current state, typically drawing
only 0.5 µA 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 versions in the compact 2 mm x
2 mm DFN lead-less package or the thin SOT23-5
package.
Applications
•
•
•
•
•
•
Cellular Phones
PDAs
Fiber Optic Modules
Portable Electronics
Notebook PCs
Audio Codec Power Supplies
Package Types
MIC5319-
X
.
X
YML (F
IXED
)
6-Lead DFN (ML)
(Top View)
MIC5319YML (A
DJ
.)
6-Lead DFN (ML)
(Top View)
MIC5319-
X
.
X
YD5
SOT23-5 (D5)
(Top View)
EN 1
GND 2
VIN 3
EP
6 BYP
5 NC
4 VOUT
EN 1
GND 2
VIN 3
EP
6 BYP
5 ADJ
4 VOUT
EN GND VIN
3
2
1
KWxx
4
5
BYP
VOUT
2018 Microchip Technology Inc.
DS20005876B-page 1
MIC5319
Typical Application Circuit
MIC5319
DFN-6 or SOT23-5
MIC5319-2.8
V
IN
1μF
VIN VOUT
EN
BYP
GND
0.1μF
2.8V@500mA
V
OUT
2.2μF
Functional Block Diagrams
MIC5319
(Fixed Output Voltage)
VIN
EN
V
REF
VOUT
QUICK-
START
ERROR
AMP
BYP
THERMAL
SHUTDOWN
MIC5319
CURRENT
LIMIT
GND
MIC5319
(Adjustable Output Voltage)
VOUT
VIN
EN
V
REF
QUICK-
START
ERROR
AMP
ADJ
BYP
THERMAL
SHUTDOWN
MIC5319
GND
CURRENT
LIMIT
DS20005876B-page 2
2018 Microchip Technology Inc.
MIC5319
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Input Voltage (V
IN
) ................................................................................................................................ 0V to +6V
Enable Input Voltage (V
EN
) ............................................................................................................................... 0V to +6V
Power Dissipation (P
D
) (Note
1)
............................................................................................................ Internally Limited
ESD Rating (Note
2)
........................................................................................................................................ 3 kV, HBM
Operating Ratings ‡
Supply Input Voltage (V
IN
) ........................................................................................................................ +2.5V to +5.5V
Enable Input Voltage (V
EN
) .................................................................................................................................0V to V
IN
† Notice:
Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice:
The device is not guaranteed to function outside its operating ratings.
Note 1:
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 reg-
ulator may go into thermal shutdown.
2:
Devices are ESD sensitive. Handling precautions recommended.
2018 Microchip Technology Inc.
DS20005876B-page 3
MIC5319
TABLE 1-1:
ELECTRICAL CHARACTERISTICS
Electrical Characteristics:
V
IN
= V
OUT
+ 1.0V; C
OUT
= 2.2 µF; I
OUT
= 100 µA; T
A
= +25°C,
bold
values are available
for the –40°C to +125°C junction temperature range, unless otherwise noted. (Note
1)
Parameter
Output Voltage Accuracy
Feedback Voltage (Adj.
Option)
Line Regulation
Load Regulation (Note
2)
Dropout Voltage (Note
3,
Note 4)
Ground Pin Current (Note
5)
Ground Pin Current in
Shutdown Mode
Power Supply Ripple
Rejection
Current Limit
Output Voltage Noise
Turn-On Time
Enable Input Voltage
Enable Input Current
Note 1:
2:
3:
Symbol
∆V
OUT
V
ADJ
∆V
OUT
/(
V
OUT
x
∆V
IN
)
∆V
OUT
/
V
OUT
V
DO
I
GND
I
SHDN
Min.
–1.0
–2.0
1.2375
1.225
—
—
—
—
—
—
—
PSRR
—
I
LIMIT
e
N
t
ON
V
ENABLE
I
ENABLE
600
—
—
—
1.2
—
—
60
700
40
40
—
—
0.01
0.01
—
—
—
100
0.2
—
1
1
dB
mA
µV
RMS
µs
V
µA
Typ.
—
—
1.25
1.25
0.04
0.1
20
200
90
0.5
70
Max.
1.0
2.0
1.2625
1.275
0.3
0.5
40
400
150
—
—
%
Units
Conditions
Variation from nominal V
OUT
Variation from nominal V
OUT
,
I
OUT
= 100 µA to 500 mA
—
V
IN
= V
OUT
+1V to +5.5V
I
L
= 100 µA to 500 mA
I
OUT
= 50 mA
I
OUT
= 500 mA
I
OUT
= 0 mA to 500 mA
V
EN
≤
0.2V
f = up to 1 kHz; C
OUT
= 2.2 µF
ceramic; C
BYP
= 0.1 µF
f = 10 kHz; C
OUT
= 2.2 µF ceramic;
C
BYP
= 0.1 µF
V
OUT
= 0V
C
OUT
= 2.2 µF; C
BYP
= 0.1 µF;
10 Hz to 100 kHz
C
OUT
= 2.2 µF; C
BYP
= 0.1 µF
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
V
IL
=
≤
0.2V (Regulator Shutdown)
V
IH
=
≥
1.0V (Regulator Shutdown)
V
%/V
%
mV
µA
µA
dB
4:
5:
Specification for packaged product only.
Regulation is measured at constant junction temperature using low duty cycle pulse testing.
Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its
nominal V
OUT
. For outputs below 2.5V, dropout voltage spec does not apply, as the part is limited by mini-
mum V
IN
spec of 2.5V. There may be some typical dropout degradation at V
OUT
< 3V.
For Adjustable option, V
OUT
= 3V for dropout specification.
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.
DS20005876B-page 4
2018 Microchip Technology Inc.
MIC5319
TEMPERATURE SPECIFICATIONS (Note
1)
Parameters
Temperature Ranges
Junction Operating Temperature
Range
Storage Temperature Range
Lead Temperature
Package Thermal Resistances
Thermal Resistance DFN-6
Thermal Resistance Thin SOT23-5
Note 1:
JA
JA
—
—
93
235
—
—
°C/W
°C/W
—
—
T
J
T
S
—
–40
–65
—
—
—
—
+125
+150
+260
°C
°C
°C
—
—
Soldering, 5s
Sym.
Min.
Typ.
Max.
Units
Conditions
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., T
A
, T
J
,
JA
). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.
2018 Microchip Technology Inc.
DS20005876B-page 5
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