August 2004
1
M9999-081704
MIC5305
Micrel
MIC5305
150mA
Cap Ultra-Low Dropout LDO Regulator
General Description
The MIC5305 is a high-performance, 150mA LDO regulator,
offering extremely high PSRR and very low noise while
consuming low ground current.
Ideal for battery-operated applications, the MIC5305 fea-
tures 1% accuracy, extremely low-dropout voltage (60mV @
150mA), and low ground current at light load (typically 90
A).
Equipped with a logic-compatible enable pin, the MIC5305
can be put into a zero-off-mode current state, drawing no
current when disabled.
The MIC5305 is a
Cap design operating with very small
ceramic output capacitors for stability, thereby reducing
required board space and component cost.
The MIC5305 is available in fixed-output voltages and adjust-
able output voltages in the super-compact 2mm
2mm
MLFTM-6 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
MIC5305
VOUT
VIN
BYP
EN
GND
3.0V
V
IN
2.85V@150mA
V
OUT
1
F
0.1
F
1
F
Features
Ultra-low dropout voltage of 60mV @ 150mA
Input voltage range: 2.25 to 5.5V
Stable with ceramic output capacitor
150mA guaranteed output current
Low output noise -- 20
Vrms
Low quiescent current of 90
A total
High PSRR, up to 85dB @1kHz
Less than 30
s turn-on time w/C
BYP
= 0.01
F
High output accuracy:
1.0% initial accuracy
2.0% over temperature
Thermal shutdown protection
Current limit protection
Tiny 2mm
2mm MLFTM-6 package
Thin SOT-23-5 package
Applications
Cellular phones
PDAs
Fiber optic modules
Portable electronics
Notebook PCs
Audio Codec power supplies
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 474-1000 fax + 1 (408) 474-1000 http://www.micrel.com
Micro
LeadFrame and MLF are trademarks of Amkor Technology.
0
10
20
30
40
50
60
70
0
20 40 60 80 100 120 140
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
0
10
20
30
40
50
60
70
80
90
100
0.1
1
10
100
PSRR (dB)
FREQUENCY (kHz)
PSRR
(Bypass Pin Cap = 0.1
F)
150mA
50mA
100
A
1k
August 2004
3
M9999-081704
MIC5305
Micrel
Pin Description
Pin Number
Pin Number
Pin Number
Pin Name
Pin Function
MLF-6 Fixed
MLF-6 Adjust. 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 0.01
F to GND for reduced
output noise. May be left open.
HS Pad
HS Pad
-
EPAD
Exposed Heatsink Pad connected to ground internally.
Pin Configuration
1
EN
GND
VIN
6 BYP
NC
VOUT
5
4
2
3
MIC5305-x.xBML
6-Pin 2mm
2mm MLFTM (ML)
(Top View)
VIN
VOUT
BYP
EN
KWxx
1
3
4
5
2
GND
MIC5305-x.xBD5
TSOT-23-5 (D5)
(Top View)
1
EN
GND
VIN
6 BYP
ADJ
VOUT
5
4
2
3
MIC5305BML (Adjustable)
6-Pin 2mm
2mm MLFTM (ML)
(Top View)
MIC5305
Micrel
August 2004
4
M9999-081704
Electrical Characteristics
(5)
V
IN
= V
OUT
+1.0V; C
OUT
= 1.0
F, I
OUT
= 100
A; T
J
= 25
C, bold values indicate 40
C to + 125
C; 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
= 100
A to 150mA
2.0
+2.0
%
Output Voltage Temp. Coefficient
40
ppm/
C
Line Regulation
V
IN
= V
OUT
+1V to 5.5V
0.02
0.3
%/V
Load Regulation
(6)
I
OUT
= 100
A to 150mA
0.1
0.5
%
Dropout Voltage
(7)
I
OUT
= 50mA
20
35
mV
I
OUT
= 150mA
60
85
mV
Ground Pin Current
(8)
I
OUT
= 0 to 150mA
90
150
A
Ground Pin Current in Shutdown
V
EN
0.2V
0.5
A
Ripple Rejection
f = up to 1kHz; C
OUT
= 1.0
F ceramic; C
BYP
= 0.1
F
85
dB
f = 10kHz; C
OUT
= 1.0
F ceramic; C
BYP
= 0.1
F
65
dB
Current Limit
V
OUT
= 0V
300
600
900
mA
Output Voltage Noise
C
OUT
=1
F, C
BYP
= 0.01
F, 10Hz to 100kHz
20
Vrms
Turn-On Time
C
OUT
= 1
F; C
BYP
= 0.01
F; I
OUT
= 150mA
30
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 ratings.
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 will 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, changes in output voltage due to heating effects are
covered by the thermal regulation specification.
7.
Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differen-
tial. For outputs below 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V.
8.
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
) ........................ 40
C to +125
C
Storage Temperature (T
S
) ......................... 65
C to 150
C
Lead Temperature (soldering, 5 sec.) ....................... 260
C
ESD
(4) ..............................................................................................
2kV
Operating Ratings
(2)
Supply Input Voltage (V
IN
) ............................ 2.25V to 5.5V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
) ....................... 40
C to +125
C
Package Thermal Resistance (est.)
MLF-6 (
JA
) ........................................................ 93
C/W
TSOT-23 (
JA
) ................................................... 235
C/W
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