October 2004
1
M9999-100604
MIC5319
Micrel
MIC5319
500mA
Cap Ultra-Low Dropout, High PSRR LDO Regulator
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 fea-
tures 1% accuracy, extremely low-dropout voltage (200mV
@ 500mA), and low ground current at light load (typically
90A). 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 Cap 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 adjust-
able output voltages in the super-compact 2mm x 2mm
MLFTM leadless package and thin SOT-23-5 package.
Additional voltage options are available. Contact Micrel
marketing.
All support documentation can be found on Micrel's web
site at www.micrel.com.
Typical Application
Features
Ultra-low dropout voltage 200mV @ 500mA
Input voltage range: 2.5 to 5.5V
Stable with ceramic output capacitor
Low output noise -- 40Vrms
Low quiescent current of 90
A total
High PSRR, up to 70dB @1kHz
Fast turn-on-time -- 40s 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 MLFTM 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
Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
Micro
LeadFrame and MLF are trademarks of Amkor Technology, Inc.
0
10
20
30
40
50
60
70
80
90
100
PSRR (dB)
FREQUENCY (Hz)
PSRR
(Bypass Pin Cap = 0.1F)
50mA
500mA
100A
1k
10
100
10k
100k
1M
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
0
20
40
60
80
100
120
140
160
180
200
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
Vout = 2.8V
Cout = 2.2uF
0
100
200
300
400
500
MIC5319
VOUT
VIN
BYP
EN
GND
V
IN
2.8V@500mA
V
OUT
2.2
F
0.1
F
1
F
MIC5319
Micrel
October 2004
2
M9999-100604
Ordering Information
Part Number
Marking
Voltage
Junction Temp. Range
(1)
Package
MIC5319-2.8BD5
N928
2.8
40C to +125C
Thin SOT23-5
MIC5319-2.8BML
928
2.8
40C to +125C
6-pin 2x2 MLFTM
MIC5319BML
9AA
ADJ
40C to +125C
6-pin 2x2 MLFTM
MIC5319-2.8YD5
N928
2.8
40C to +125C Thin SOT23-5 Pb-Free
MIC5319-2.8YML
928
2.8
40C to +125C 6-pin 2x2 MLFTM Pb-Free
MIC5319YML
9AA
ADJ
40C to +125C 6-pin 2x2 MLFTM Pb-Free
Note:
1. For other output voltage options, contact Micrel marketing.
Pin Configuration
1
EN
GND
VIN
6
BYP
NC
VOUT
5
4
2
3
MIC5319-x.xBML
6-Pin 2mm x 2mm MLFTM (ML)
(Top View)
VIN
VOUT
BYP
EN
KWxx
1
3
4
5
2
GND
MIC5319-x.xBD5
TSOT-23-5 (D5)
(Top View)
1
EN
GND
VIN
6
BYP
ADJ
VOUT
5
4
2
3
MIC5319BML (Adjustable)
6-Pin 2mm x 2mm MLFTM (ML)
(Top View)
Pin Description
Pin Number
Pin Number
Pin Number
Pin Name
Pin Function
MLF-6 Fixed
MLF-6 Adj.
TSOT-23-5 Fixed
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
Adjust Input: Connect to external resistor voltage divider network.
5
NC
No connection for fixed voltage parts.
6
6
4
BYP
Reference Bypass: Connect external 0.1F to GND for reduced
output noise. May be left open.
HS Pad
HS Pad
EPAD
Exposed Heatsink Pad connected to ground internally.
October 2004
3
M9999-100604
MIC5319
Micrel
Electrical Characteristics
(5)
V
IN
= V
OUT
+1.0V; C
OUT
= 2.2F, I
OUT
= 100A; T
J
= 25C, bold values indicate 40C to + 125C; unless noted.
Parameter
Condition
Min
Typ
Max
Units
Output Voltage Accuracy
Variation from nominal V
OUT
1.0
+1.0
%
Variation from nominal V
OUT
, I
OUT
= 100A to 500mA
2.0
+2.0
%
Feedback Voltage
1.2375
1.25
1.2625
V
(ADJ option)
1.225
1.25
1.275
V
Line Regulation
V
IN
= V
OUT
+1V to 5.5V
0.04
0.3
%/V
Load Regulation
(6)
I
OUT
= 100A to 500mA
0.1
0.5
%
Dropout Voltage
(7)(8)
I
OUT
= 50mA
20
40
mV
I
OUT
= 500mA
200
400
mV
Ground Pin Current
(9)
I
OUT
= 0 to 500mA
90
150
A
Ground Pin Current in Shutdown
V
EN
0.2V
0.5
A
Ripple Rejection
f = up to 1kHz; C
OUT
= 2.2F ceramic; C
BYP
= 0.1F
70
dB
f = 10kHz; C
OUT
= 2.2F ceramic; C
BYP
= 0.1F
60
dB
Current Limit
V
OUT
= 0V
600
700
mA
Output Voltage Noise
C
OUT
=2.2F, C
BYP
= 0.1F, 10Hz to 100kHz
40
Vrms
Turn-On Time
C
OUT
= 2.2F; C
BYP
= 0.01F
40
100
s
Enable Input
Enable Input Voltage
Logic Low (Regulator Shutdown)
0.2
V
Logic High (Regulator Enabled)
1.0
V
Enable Input Current
V
IL
0.2V (Regulator Shutdown)
0.01
1
A
V
IH
1.0V (Regulator Enabled)
0.01
1
A
Notes:
1. Exceeding maximum ratings may damage the device.
2. The device is not guaranteed to work outside its operating rating.
3. The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D
(max) = (T
J
(max) - T
A
) /
JA
. 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 V
OUT
. For outputs below 2.5V,
dropout voltage spec does not apply, as part is limited by minimum V
IN
spec of 2.5V. There may be some typical dropout degradation at V
OUT
<3V.
8. For ADJ option, V
OUT
= 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.
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
) .................................... 0V to 6V
Enable Input Voltage (V
EN
) ................................... 0V to 6V
Power Dissipation (P
D
) ........................ Internally Limited
(3)
Junction Temperature(T
J
) ........................ 40C to +125C
Storage Temperature (T
S
) ......................... 65C to 150C
Lead Temperature (soldering, 5 sec.) ....................... 260C
ESD
(4) ..............................................................................................
3kV
Operating Ratings
(2)
Supply Input Voltage (V
IN
) .............................. 2.5V to 5.5V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
) ....................... 40C to +125C
Package Thermal Resistance
MLFTM (
JA
) ......................................................... 93C/W
TSOT-23 (
JA
) ................................................... 235C/W
MIC5319
Micrel
October 2004
4
M9999-100604
Typical Characteristics
0
10
20
30
40
50
60
70
80
90
100
PSRR (dB)
FREQUENCY (Hz)
PSRR
(Bypass Pin Cap = 0.01F)
50mA
500mA
100A
1k
10
100
10k
100k
1M
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
0
10
20
30
40
50
60
70
80
90
100
PSRR (dB)
FREQUENCY (Hz)
PSRR
(Bypass Pin Cap = 0.1F)
50mA
500mA
100A
1k
10
100
10k
100k
1M
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
55
60
65
70
75
80
85
0.1
1
10
100
1000
GROUND CURRENT (
A)
OUTPUT CURRENT (mA)
Ground Current
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
Cbyp = 0.01uF
0
10
20
30
40
50
60
70
80
90
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (
A)
TEMPERATURE (C)
Ground Current
Iload = 50mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
0
10
20
30
40
50
60
70
80
90
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (
A)
TEMPERATURE (C)
Ground Current
Iload = 150mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
0
10
20
30
40
50
60
70
80
90
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (
A)
TEMPERATURE (C)
Ground Current
Iload = 300mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
0
10
20
30
40
50
60
70
80
90
100
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (
A)
TEMPERATURE (C)
Ground Current
Iload = 500mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
0
10
20
30
40
50
60
70
80
90
100
3
3.5
4
4.5
5
5.5
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Current
Iload = 50mA
Vout = 2.8V
Cout = 2.2 uF
0
10
20
30
40
50
60
70
80
90
100
3
3.5
4
4.5
5
5.5
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Current
Iload = 150mA
Vout = 2.8V
Cout = 2.2 uF
0
10
20
30
40
50
60
70
80
90
3
3.5
4
4.5
5
5.5
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Current
Iload = 500mA
Vout = 2.8V
Cout = 2.2uF
0
0.5
1
1.5
2
2.5
3
0
1
2
3
4
5
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Dropout Characteristics
50mA
150mA
500mA
0
5
10
15
20
25
30
-40 -20 0
20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (C)
Dropout Voltage
Iload = 50mA
Vout = 2.8V
Cout = 2.2uF
October 2004
5
M9999-100604
MIC5319
Micrel
0
10
20
30
40
50
60
70
80
-40 -20 0
20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (C)
Dropout Voltage
Iload = 150mA
Vout = 2.8V
Cout = 2.2uF
0
50
100
150
200
250
-40 -20 0
20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (C)
Dropout Voltage
Iload = 500mA
Vout = 2.8V
Cout = 2.2uF
0
20
40
60
80
100
120
140
160
180
200
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
Vout = 2.8V
Cout = 2.2uF
0
100
200
300
400
500
2.6
2.65
2.7
2.75
2.8
2.85
2.9
2.95
3
-40 -20 0
20 40 60 80 100 120
OUTPUT VOLTAGE (V)
TEMPERATURE (C)
Output Voltage vs.
Temperature
Iload = 100uA
Vout = 2.8V
Vin = Vout + 1V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
-40 -20 0
20 40 60 80 100 120
ENABLE THRESHOLD VOLTAGE (V)
TEMPERATURE (C)
Enable Threshold vs.
Temperature
Iload = 100uA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
100
200
300
400
500
600
700
3
3.5
4
4.5
5
5.5
6
SHORT CIRCUIT CURRENT (mA)
INPUT VOLTAGE (V)
Short Circuit Current
Iload = 100uA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
0.001
0.01
0.1
1
10
NOISE (
V/ Hz)
FREQUENCY (Hz)
Output Noise Spectral Density
Iload = 50
Vout = 2.8V
Vin = 4.45V
Cout = 2.2uF
Cbyp = 0.01uF
10
100
1k
10k 100k 1M 10M
PDF 
ZIP