MIC5306
150mA Micropower Cap Baseband LDO
Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
August 2005
M9999-080805
(408) 955-1690
General Description
The MIC5306 is a micropower, Cap low dropout
regulator designed for optimal performance in a small
space. It is capable of sourcing 150mA of output current
and only draws 16A of operating current. This high
performance LDO offers fast transient response and
good PSRR while consuming a minimum of current.
Ideal for battery operated applications; the MIC5306
offers 1% accuracy, extremely low dropout voltage
(45mV @ 100mA). Equipped with a TTL logic
compatible enable pin, the MIC5306 can be put into a
zero-off-mode current state, drawing no current when
disabled.
The MIC5306 is a Cap design, operating with very
small ceramic output capacitors for stability, reducing
required board space and component cost.
The MIC5306 is available in fixed output voltages in
Thin SOT23-5 packaging.
Features
Input voltage range: 2.25V to 5.5V
Ultra-low I
Q
: Only 16A operating current
Stable with ceramic output capacitor
Low dropout voltage of 45mV @ 100mA
High output accuracy
- 1.0% initial accuracy
- 2.0% over temperature
Thermal Shutdown Protection
Current Limit Protection
Applications
Digital Logic Power Supply
Stand-by power supply
Cellular phones
PDAs
Portable electronics
Notebook
PCs
_________________________________________________________________________________________________________
Typical Application
1F
Applications
MIC5306
Co-processor
VIN VOUT
EN
GND
1F
0
2
4
6
8
10
12
16
18
20
Ground Pin Current
vs. Temperature
TEMPERATURE (C)
14
V
OUT
= 2.8V
V
IN
= V
OUT
+ 1V
C
OUT
= 1F
100A
150mA
Micrel, Inc.
MIC5306
August 2005
4
M9999-080805
(408) 955-1690
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 ....................... -40C to +125C
Lead Temperature (soldering, 5sec.) .................260C
Storage Temperature (T
s
) ................. -65C to +150C
Operating Ratings
(2)
Supply Input Voltage (V
IN
)........................2.25V to 5.5V
Enable Input Voltage
(EN1/EN2/LOWQ)
.................. 0V to VIN
Junction Temperature (T
J
) .................. -40C to +125C
TSOT23-5(
JA
) ............................................... 235C
Electrical Characteristics
V
IN
= V
OUT
+ 1.0V; C
OUT
= 1.0F, I
OUT
= 100A; T
I
= 25C,
bold
values indicate -40C to +125, unless noted.
Parameter Conditions
Min
Typ
Max
Units
Variation from nominal V
OUT
-1
+1
%
Output Voltage Accuracy
Variation from nominal V
OUT
; -40C to +125C
-2 +2
%
Line Regulation
V
IN
= V
OUT
+1V to 5.5V
0.01
0.3
0.5
%/V
Load Regulation
I
OUT
= 100
A to 150mA
0.5
1
1.5
%
Dropout Voltage
(4)
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
25
45
65
200
mV
Ground Pin Current
I
OUT
= 0mA to 150mA; V
IN
= 5.5V
16
25
A
Ground Pin Current in
Shutdown
V
EN
< 0.2V; V
IN
= 5.5V
0.01
1
A
Ripple Rejection
f = 10Hz to 1kHz; C
OUT
= 1
F; I
OUT
= 150mA
f = 20kHz; C
OUT
= 1
F; I
OUT
= 150mA
62
35
dB
Current Limit
V
OUT
= 0V
175 285 500 mA
Thermal Shutdown
150
C
Thermal Shutdown Hysteresis
15
C
Output Voltage Noise
C
OUT
= 1F; 10Hz to 100kHz
91 Vrms
Enable Input
Logic Low
0.2
V
Enable Input Voltage
Logic High
1.0
V
V
IL
< 0.2V
0.01
1
A
Enable Input Current
V
IH
> 1.0V
0.01
1
A
Turn-on Time
(5)
C
OUT
= 1F
250
500
s
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function 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 will go into thermal shutdown.
4. 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 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V.
5. Turn-on time is measured from Ven=1V of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
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