MIC5318
High Performance 300mA
µCap ULDO™
General Description
The MIC5318 is a high performance, single output
ultra low drop-out (ULDO™) regulator, offering low
total output noise in an ultra-small Thin MLF
®
package. The MIC5318 is capable of sourcing 300mA
output current and offers high PSRR and low output
noise, making it an ideal solution for RF applications.
Ideal for battery operated applications, the MIC5318
offers 2% initial accuracy, extremely low dropout
voltage (110mV @ 300mA), and low ground current
(typically 85µA total). The MIC5318 can also be put
into a zero-off-mode current state, drawing no current
when disabled.
The MIC5318 is available in the 1.6mm x 1.6mm Thin
MLF
®
package, occupying only 2.56mm
2
of PCB area,
fully a 36% reduction in board area when compared to
SC-70 and 2mm x 2mm MLF
®
packages.
The MIC5318 has an operating junction temperature
range of –40°C to +125°C and is available in fixed and
adjustable output voltages in lead-free (RoHS
compliant) Thin MLF
®
and Thin SOT23-5 packages.
Data sheets and support documentation can be found
on Micrel’s web site at: www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
Ultra low dropout voltage 110mV @ 300mA
Input voltage range: 2.3V to 6.0V
300mA guaranteed output current
Stable with ceramic output capacitors
Ultra low output noise – 30µVrms
Low quiescent current – 85µA total
High PSRR > 70dB@1kHz
Less than 35µs turn-on time
High output accuracy
– ± 2% initial accuracy
– ± 3% over temperature
Thermal shutdown and current limit protection
Tiny 6-pin 1.6mm x 1.6mm Thin MLF
®
package
Thin SOT23-5 package
•
•
•
Applications
•
•
•
•
•
Mobile phones
PDAs
GPS receivers
Portable electronics
Digital still and video cameras
Typical Application
MIC5318-x.xYMT
V
IN
VIN
EN
VOUT
1µF
BYP
GND
1µF
0.01µF
Portable Application
ULDO is a trademark of Micrel, Inc.
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
January 2007
M9999-011207
Micrel, Inc.
MIC5318
Functional Diagram
VIN
EN
V
REF
Quick-
Start
VOUT
Error
LDO
Amp
BYP
Thermal
Shutdown
Current
Limit
GND
MIC5318 Block Diagram – Fixed
VIN
EN
V
REF
Quick-
Start
VOUT
Error
LDO
Amp
BYP
ADJ
Thermal
Shutdown
Current
Limit
GND
MIC5318 Block Diagram – Adjustable
January 2007
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M9999-011207
Micrel, Inc.
MIC5318
Ordering Information
Part number
MIC5318-1.5YMT
MIC5318-1.8YMT
MIC5318-2.8YMT
MIC5318-3.3YMT
MIC5318YMT
MIC5318-1.5YD5
MIC5318-1.8YD5
MIC5318-2.8YD5
MIC5318-3.3YD5
MIC5318YD5
Note:
For availability on other voltages, please contact Micrel for details.
Marking Code
15D
18D
28D
33D
DAA
QD15
QD18
QD28
QD33
QDAA
Output Voltage
1.5V
1.8V
2.8V
3.3V
ADJ
1.5V
1.8V
2.8V
3.3V
ADJ
Temperature Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
6-Pin 1.6 x 1.6 Thin MLF
®
6-Pin 1.6 x 1.6 Thin MLF
®
6-Pin 1.6 x 1.6 Thin MLF
®
6-Pin 1.6 x 1.6 Thin MLF
®
6-Pin 1.6 x 1.6 Thin MLF
®
5-Pin Thin SOT23
5-Pin Thin SOT23
5-Pin Thin SOT23
5-Pin Thin SOT23
5-Pin Thin SOT23
January 2007
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M9999-011207
Micrel, Inc.
MIC5318
Pin Configuration
EN 1
GND 2
IN 3
6
5
4
BYP
NC
OUT
®
EN 1
GND 2
IN 3
6
5
4
BYP
ADJ
OUT
®
6-Pin 1.6mm x 1.6mm Thin MLF (MT)
Fixed (Top View)
6-Pin 1.6mm x 1.6mm Thin MLF (MT)
Adjustable (Top View)
EN GND IN
1
3
2
EN GND IN
1
3
2
4
BYP
5
OUT
4
ADJ
5
OUT
5-Pin Thin SOT23 (D5)
Fixed (Top View)
5-Pin Thin SOT23 (D5)
Adjustable (Top View)
Pin Description
Pin No.
Thin MLF-6
Fixed
1
2
3
4
5
–
6
HS Pad
Pin No.
Thin MLF-6
Adj.
1
2
3
4
–
5
6
HS Pad
Pin No.
Thin SOT23-5
Fixed
3
2
1
5
–
–
4
–
Pin No.
Thin SOT23-5
Adj.
3
2
1
5
–
4
–
–
Pin Name
Pin Function
EN
GND
IN
OUT
NC
ADJ
BYP
E PAD
Enable Input. Active High. High = on, low = off.
Do not leave floating.
Ground
Supply Input.
Output Voltage.
No connection.
Adjust Input. Connect to external resistor voltage
divider network.
Reference Bypass: Connect external 0.01
µ
F to
GND for reduced Output Noise. May be left open.
Exposed Heatsink Pad connected to ground
internally.
January 2007
4
M9999-011207
Micrel, Inc.
MIC5318
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ..................................0V to +6.5V
Enable Input Voltage (V
EN
)........................0V to +6.5V
Power Dissipation, Internally Limited
(3)
Lead Temperature (soldering, 3sec) ..................260°C
Junction Temperature (T
J
)................ –40°C to +125°C
Storage Temperature (T
S
) ................ –65°C to +150°C
ESD Rating
(4)
Operating Ratings
(2)
Supply Voltage (V
IN
).............................. +2.3V to +6.0V
Enable Input Voltage (V
EN
).............................. 0V to V
IN
Junction Temperature (T
J
) ................. –40°C to +125°C
Junction Thermal Resistance
Thin MLF-6 (θ
JA
)...................................... 100°C/W
TSOT-23-5 (θ
JA
) ...................................... 235°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 1.0V; C
OUT
= 1.0µF; 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, Note 6
Dropout Voltage, Note 7
Conditions
Variation from nominal V
OUT
Variation from nominal V
OUT
; –40°C to +125°C
V
IN
= V
OUT
+ 1V to 6.0V; I
OUT
= 100µA
I
OUT
= 100µA to 300mA
I
OUT
= 50mA; V
OUT
≥
2.8V
I
OUT
= 150mA; V
OUT
≥
2.8V
I
OUT
= 300mA; V
OUT
≥
2.8V
Min
-2.0
Typ
Max
+2.0
Units
%
%
%/V
%
mV
mV
mV
µA
µA
dB
dB
-3.0
0.02
0.2
17
50
110
85
0.01
75
55
+3.0
0.6
2.0
100
200
150
1
Ground Pin Current, Note 8
Ground Pin Current in
Shutdown
Ripple Rejection
Current Limit
Output Voltage Noise
I
OUT
= 0 to 300mA
V
EN
≤
0.2V
f = up to 1kHz; C
OUT
= 1.0µF; C
BYP
= 0.1µF
f = 1kHz – 20kHz; C
OUT
= 1.0µF; C
BYP
= 0.1µF
V
OUT
= 0V
C
OUT
= 1.0µF; C
BYP
= 0.1µF; 10Hz to 100kHz
Logic Low
Logic High
340
500
30
900
mA
µV
RMS
Enable Input
Enable Input Voltage
Enable Input Current
0.2
1
0.01
0.01
30
1
1
V
V
µA
µA
µs
V
IL
≤
0.2V
V
IH
≥
1.0V
Turn-on Time
Turn-on Time
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
) /
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.
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
differential. For outputs below 2.3V, dropout voltage is the input-to-output differential with the minimum input voltage 2.3V.
8. Ground pin current is the regulation quiescent current. The total current drawn from the supply is the sum of the load current plus the ground
pin current.
C
OUT
= 1.0µF; C
BYP
= 0.1µF; I
OUT
= 150mA
100
January 2007
5
M9999-011207
嵌入式系统
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