MIC5337
1.2mm x 1.6mm 300mA Low I
Q
LDO
Ultra Low Dropout with Auto Discharge
General Description
The MIC5337 is a low quiescent current, low dropout
regulator with an internal auto discharge feature designed
for optimal performance in a small space. The MIC5337 is
capable of sourcing 300mA of output current while only
consuming 24µA of operating current. When the MIC5337
is disabled an internal resistive load is automatically
applied to the output to discharge the output capacitor.
This high performance LDO offers fast transient response
as well as maintaining a high PSRR.
The MIC5337 is an ideal solution for battery operated
applications due to ultra low operating current and
extremely low dropout voltage of 180mV at 300mA.
Equipped with a TTL logic compatible enable pin, the
MIC5337 can be put into a zero-off-mode current state,
drawing virtually no current when disabled.
Board space and component cost is minimized because
the MIC5337 operates with very small 1μF ceramic
capacitors, provides fixed output voltages, and is available
in the tiny 1.2mm x 1.6mm Thin MLF package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
300mA output current
Low I
Q
: only 24µA operating current
Low dropout voltage of 180mV @ 300mA
Active discharge when enable pin is low
Input voltage range: 2.3V to 5.5V
Fixed output voltages
Stable with 1μF ceramic capacitors
Thermal shutdown and current limit protection
Tiny 4-pin 1.2mm x 1.6mm Thin MLF
®
package
Applications
•
•
•
•
•
•
Mobile phones
GPS and navigation devices
Portable media players
Digital still and video cameras
PDAs
Portable electronics
___________________________________________________________________________________________________________
Typical Application
MIC5337-xxYMT
VIN
VOUT
VOUT
VBAT
1µF
VEN
GND
1µF
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2008
M9999-090908-A
Micrel, Inc.
MIC5337
Ordering Information
Part Number
MIC5337-2.8YMT
MIC5337-1.8YMT
Note:
1.
2.
3.
Pin 1 identifier= “▲”.
For other voltage options contact Micrel Marketing.
MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu, Mold compound is Halogen Free.
Marking
(1)
281
181
Voltage
(2)
2.8V
1.8V
Temperature Range
–40° to +125°C
–40° to +125°C
Package
(3)
4-Pin 1.2mm x 1.6mm Thin MLF
®
4-Pin 1.2mm x 1.6mm Thin MLF
®
Pin Configuration
VIN 1
GND 2
4
3
VOUT
EN
4-Pin 1.2mm x 1.6mm Thin MLF
®
(MT)
Pin Description
Pin Number
1
2
3
4
HS Pad
Pin Name
VIN
GND
EN
VOUT
EPAD
Pin Function
Supply Input.
Ground.
Enable Input: Active High Input. Logic High = On; Logic Low = Off. Do not leave
floating.
Output Voltage.
Exposed heatsink pad connected to ground internally.
September 2008
2
M9999-090908-A
Micrel, Inc.
MIC5337
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ........................................ –0.3V to +6V
Enable Voltage (V
EN
)......................................... –0.3V to V
IN
Power Dissipation (P
D
) ........................... Internally Limited
(3)
Lead Temperature (soldering, 5μsec.)....................... 260°C
Junction Temperature(T
J
)………… ...........-40°C to +125°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(4)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
)....................................... +2.3V 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 x 1.6mm
Thin MLF-4 (θ
JA
) ............................173°C/W
Electrical Characteristics
(5)
V
IN
= V
EN
= V
OUT
+ 1V; C
OUT
= 1µF; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C to +125°C, unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(6)
Condition
Variation from nominal V
OUT
Variation from nominal V
OUT
V
IN
= V
OUT
+1V to 5.5V, I
OUT
= 100µA
V
IN
= V
OUT
+1V to 5.5V, I
OUT
= 100µA
I
OUT
= 100µA to 300mA
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
I
OUT
= 300mA
Min
–1.5
–2.0
Typ
Max
+1.5
+2.0
Units
%
%
%/V
%/V
%
mV
mV
0.01
0.05
30
60
90
180
24
0.01
65
50
400
600
90
280
0.3
0.5
1
(7)
150
300
35
1
mV
mV
µA
µA
dB
dB
Ground Pin Current
Ripple Rejection
Current Limit
(8)
I
OUT
= 100µA to 300mA
V
EN
= 0V
f = 1kHz; C
OUT
= 1µF; I
OUT
= 300mA
f = 20kHz; C
OUT
= 1µF; I
OUT
= 300mA
V
OUT
= 0V
C
OUT
= 1µF, 10Hz to 100kHz
V
EN
=0V, V
IN
=3.6V
Ground Pin Current in Shutdown
950
400
mA
µV
RMS
Ω
Output Voltage Noise
Auto-Discharge NFET
Resistance
Enable Voltage
Enable Voltage
Enable Current
Turn-on Time
Notes:
Logic Low
Logic High
V
IL
≤
0.2V
V
IH
≥
1.2V
C
OUT
= 1µF; I
OUT
= 300mA
1.2
0.01
0.01
150
0.2
1
1
500
V
V
µA
µA
µs
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
) /
θ
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, 1.5kΩ in series with 100pF.
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 V
OUT
.
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.
September 2008
3
M9999-090908-A
Micrel, Inc.
MIC5337
Typical Characteristics
Power Supply
Rejection Ratio
50mA
100mA
200
180
160
140
120
300mA
100
80
60
40
20
1M
0
0
V
EN
= 1.2V
V
OUT
= 2.8V
C
IN
= C
OUT
= 1µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
50
V
EN
= 1.2V
V
OUT
= 2.8V
C
IN
= C
OUT
= 1µF
Dropout Voltage
vs. Output Current
250
200
150
100
Dropout Voltage
vs. Temperature
300mA
150mA
150mA
0
10
V
EN
= V
IN
= 2.8V
V
OUT
= 1.8V
C
OUT
= 1µF
100
1k
10k 100k
FREQUENCY (Hz)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
28
26
24
22
20
18
16
0
Ground Current
vs. Output Current
34
30
26
22
18
Ground Current
vs. Input Voltage
30
Ground Current
vs. Temperature
100µA
26
100µA
22
300mA
150mA
300mA
150mA
V
IN
= V
EN
= 3.8V
V
OUT
= 2.8V
C
IN
= C
OUT
= 1µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
14
10
3.0
V
EN
= V
IN
V
OUT
= 2.8V
C
IN
= C
OUT
= 1µF
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
5.5
18
14
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
V
IN
= V
EN
= 3.8V
V
OUT
= 2.8V
C
IN
= C
OUT
= 1µF
3.5
Output Voltage
vs. Input Voltage
3.0
2.9
Output Voltage
vs. Temperature
3.0
2.9
2.8
2.7
2.6
2.5
0
Output Voltage
vs. Output Current
3.0
100µA
2.5
2.0
1.5
1.0
0.5
0
2.5
V
EN
= 1.2V
V
OUT
= 2.8V
C
IN
= C
OUT
= 1µF
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
50mA
150mA
300mA
2.8
2.7
V
EN
= V
IN
= 3.8V
I
LOAD
= 100µA
C
IN
= C
OUT
= 1µA
2.5
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
2.6
V
IN
= V
EN
= 3.8V
C
IN
= C
OUT
= 1µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
700
650
Current Limit
vs. Input Voltage
100
Output Noise
Spectral Density
V
IN
= 4.5V
V
OUT
= 2.8V
C
OUT
= 1µF
10
600
550
500
450
400
2.5
V
EN
= 1.2V
V
OUT
= 2.8V
C
IN
= C
OUT
= 1µF
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
0.1
1
0.01
10
100
1k
10k 100k
FREQUENCY (Hz)
1M
September 2008
4
M9999-090908-A
Micrel, Inc.
MIC5337
Functional Characteristics
September 2008
5
M9999-090908-A
微控制器 MCU
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