MIC5321
Dual, High Performance
150mA µCap ULDO™
General Description
The MIC5321 is a tiny Dual Ultra Low-Dropout
(ULDO™) linear regulator ideally suited for those
applications that require high PSRR because it
provides a bypass pin for those noise sensitive
portable electronics. The MIC5321 integrates two
high-performance; 150mA ULDOs into a very compact
1.6mm x 1.6mm leadless Thin MLF
®
package that
provides exceptional thermal package characteristics.
The MIC5321 is a µCap design which enables
operation with very small ceramic output capacitors
for stability, thereby reducing required board space
and component cost. The combination of extremely
low-drop-out voltage, very high power supply
rejection, very low output noise and exceptional
thermal package characteristics makes it ideal for
powering RF application, cellular phone camera
modules, imaging sensors for digital still cameras,
PDAs, MP3 players and WebCam applications.
The MIC5321 ULDO™ is available in fixed-output
voltages in the tiny 6-pin 1.6mm x 1.6mm leadless
Thin MLF
®
package which is only 2.56mm
2
in area,
less than 30% the area of the SOT-23, TSOP and
MLF
®
3x3 packages. It’s also available in the thin
SOT-23-6 lead package and the standard 6-pin
1.6mm x 1.6mm leadless package. Additional voltage
options are available. For more information, contact
Micrel marketing department.
Data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
2.3V to 5.5V input voltage range
Ultra-low dropout voltage ULDO™ 35mV @
150mA
Tiny 6-pin 1.6mm x 1.6mm Thin MLF
®
leadless
package
Low cost TSOT-23-6 package
Bypass pin for improved noise performance
High PSRR – >75dB on each LDO
Ultra low noise output - > 30µVrms
Dual 150mA outputs
µCap stable with 1µF ceramic capacitor
Low quiescent current – 150µA
Fast turn-on time – 45µs
Thermal shutdown protection
Current Limit protection
Applications
•
•
•
•
•
•
Mobile phones
PDAs
GPS receivers
Portable electronics
Portable media players
Digital still and video cameras
Typical Application
MIC5321-x.xYML
VIN
VOUT 1
VOUT 2
1µF
EN
BYP
0.01µF
GND
1µF
1µF
RF
Transceiver
Rx/Synth
Tx
RF Power Supply Circuit
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
May 2008
M9999-051508-E
Micrel, Inc.
MIC5321
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .....................................0V to +6V
Enable Input Voltage (V
EN
)...........................0V to +6V
Power Dissipation………………….Internally Limited
(3)
Lead Temperature (soldering, 3sec) ..................260°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 Input Voltage (V
EN
).............................. 0V to V
IN
Junction Temperature (T
J
) ................. –40°C to +125°C
Junction Thermal Resistance
Thin MLF-6 / MLF-6 (θ
JA
) ....................... 100°C/W
TSOT-6 (θ
JA
) ........................................... 235°C/W
Electrical Characteristics
(5)
V
IN
= EN = V
OUT
+ 1.0V; higher of the two regulator outputs, I
OUTLDO1
= I
OUTLDO2
= 100µA; C
OUT1
= C
OUT2
= 1µF;
C
BYP
= 0.01µF; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(6)
Conditions
Variation from nominal V
OUT
Variation from nominal V
OUT
; –40°C to +125°C
V
IN
= V
OUT
+ 1V to 5.5V; I
OUT
= 100µA
I
OUT
= 100µA to 150mA
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
Min
-2.0
Typ
Max
+2.0
Units
%
%
%/V
%/V
%
mV
mV
mV
mV
µA
µA
dB
dB
-3.0
0.02
0.5
0.1
12
25
35
150
0.01
75
45
+3.0
0.3
0.6
2.0
50
75
100
190
2
Ground Current
Ground Current in Shutdown
Ripple Rejection
Current Limit
Output Voltage Noise
EN = High; I
OUT1
= 150mA, I
OUT2
= 150mA
EN1
≤
0.2V
f = 1kHz; C
OUT
= 1.0µF; C
BYP
= 0.1µF
f = 20kHz; C
OUT
= 1.0µF; C
BYP
= 0.1µF
V
OUT
= 0V
C
OUT
= 1.0µF; C
BYP
= 0.01µF; 10Hz to 100kHz
Logic Low
Logic High
300
550
30
950
mA
µV
RMS
Enable Inputs (EN)
Enable Input Voltage
Enable Input Current
0.2
1.1
0.01
0.01
40
45
1
1
V
V
µA
µA
µs
µs
V
IL
≤
0.2V
V
IH
≥
1.0V
Turn-on Time (See Timing Diagram)
Turn-on Time (LDO1 and 2)
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, 1.5k in series with 100pF.
5. Specification for packaged product only.
6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below it’s nominal V
OUT
. For outputs below 2.3V,
the dropout voltage is the input-to-output differential with the minimum input voltage 2.3V
C
OUT
= 1.0µF; No C
BYP
C
OUT
= 1.0µF; C
BYP
= 0.01µF
100
100
May 2008
5
M9999-051508-E
嵌入式系统
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