MIC5320-3.0/2.6YML [MICREL]
Dual, High Performance 150mA uCap ULDO; 双通道，高性能150毫安UCAP ULDO
| 型号： | MIC5320-3.0/2.6YML |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Dual, High Performance 150mA uCap ULDO |
| 文件： | 总13页 (文件大小：418K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5320
Dual, High Performance 150mA µCap ULDO™
General Description
Features
The MIC5320 is a tiny Dual Ultra Low-Dropout
(ULDO™) linear regulator ideally suited for portable
electronics. It is ideal for general purpose/ digital
applications which require high power supply ripple
rejection (PSRR) >65dB, eliminating the need for a
bypass capacitor and providing two enable pins for
maximum flexibility. The MIC5320 integrates two high-
performance; 150mA ULDOs into a tiny 6-pin 1.6mm x
1.6mm leadless MLF® package, which provides
exceptional thermal package characteristics.
•
•
2.3V to 5.5V input voltage range
Ultra-low dropout voltage ULDO™ 35mV @
150mA
Tiny 6-pin 1.6mm x 1.6mm MLF® leadless
package
•
•
•
•
•
•
•
•
•
•
Low cost TSOT-23-6 package
Independent enable pins
PSRR – >65dB on each LDO
150mA output current per LDO
µCap stable with 1µF ceramic capacitor
Low quiescent current – 85µA per output
Fast turn-on time – 30µs
The MIC5320 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, high power supply rejection and
exceptional thermal package characteristics makes it
ideal for powering cellular phone camera modules,
imaging sensors for digital still cameras, PDAs, MP3
players and WebCam applications.
Thermal shutdown protection
Current limit protection
Applications
•
•
•
•
•
•
Mobile phones
The MIC5320 ULDO™ is available in fixed-output
voltages in the tiny 6-pin 1.6mm x 1.6mm leadless
MLF® package which is only 2.56mm2 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. Additional voltage options are
available. For more information, contact Micrel
marketing department.
PDAs
GPS receivers
Portable electronics
Portable media players
Digital still and video cameras
Data sheets and supporting documentation can be
found on Micrel’s web site at www.micrel.com.
Typical Application
MIC5320-x.xYML
Rx/Synth
Tx
VIN
VOUT 1
VOUT 2
EN 1
EN 2
1µF
RF
Transceiver
GND
1µF
1µF
RF Power Supply Circuit
ULDO is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technologies, 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
M9999-073106
July 2006
Micrel, Inc.
MIC5320
Ordering Information
Part number
Manufacturing
Part Number
Voltage
Junction Temperature
Range
Package
MIC5320-1.8/1.5YML
MIC5320-1.8/1.6YML
MIC5320-2.5/1.8YML
MIC5320-2.5/2.5YML
MIC5320-2.6/1.85YML
MIC5320-2.6/1.8YML
MIC5320-2.7/2.7YML
MIC5320-2.8/1.5YML
MIC5320-2.8/1.8YML
MIC5320-2.8/2.6YML
MIC5320-2.8/2.8YML
MIC5320-2.8/2.85YML
MIC5320-2.85/1.85YML
MIC5320-2.85/2.6YML
MIC5320-2.85/2.85YML
MIC5320-2.9/1.5YML
MIC5320-2.9/1.8YML
MIC5320-2.9/2.9YML
MIC5320-3.0/1.8YML
MIC5320-3.0/2.5YML
MIC5320-3.0/2.6YML
MIC5320-3.0/2.8YML
MIC5320-3.0/2.85YML
MIC5320-3.0/3.0YML
MIC5320-3.3/1.5YML
MIC5320-3.3/1.8YML
MIC5320-3.3/2.5YML
MIC5320-3.3/2.6YML
MIC5320-3.3/2.7YML
MIC5320-3.3/2.8YML
MIC5320-3.3/2.85YML
MIC5320-3.3/2.9YML
MIC5320-3.3/3.0YML
MIC5320-3.3/3.2YML
MIC5320-3.3/3.3YML
MIC5320-1.8/1.5YD6
MIC5320-1.8/1.6YD6
MIC5320-2.5/1.8YD6
MIC5320-2.5/2.5YD6
MIC5320-2.6/1.85YD6
MIC5320-2.6/1.8YD6
MIC5320-2.7/2.7YD6
MIC5320-2.8/1.5YD6
MIC5320-2.8/1.8YD6
MIC5320-2.8/2.6YD6
MIC5320-2.8/2.8YD6
MIC5320-GFYML
MIC5320-GWYML
MIC5320-JGYML
MIC5320-JJYML
MIC5320-KDYML
MIC5320-KGYML
MIC5320-LLYML
MIC5320-MFYML
MIC5320-MGYML
MIC5320-MKYML
MIC5320-MMYML
MIC5320-MNYML
MIC5320-NDYML
MIC5320-NKYML
MIC5320-NNYML
MIC5320-OFYML
MIC5320-OGYML
MIC5320-OOYML
MIC5320-PGYML
MIC5320-PJYML
MIC5320-PKYML
MIC5320-PMYML
MIC5320-PNYML
MIC5320-PPYML
MIC5320-SFYML
MIC5320-SGYML
MIC5320-SJYML
MIC5320-SKYML
MIC5320-SLYML
MIC5320-SMYML
MIC5320-SNYML
MIC5320-SOYML
MIC5320-SPYML
MIC5320-SRYML
MIC5320-SSYML
MIC5320-GFYD6
MIC5320-GWYD6
MIC5320-JGYD6
MIC5320-JJYD6
MIC5320-KDYD6
MIC5320-KGYD6
MIC5320-LLYD6
MIC5320-MFYD6
MIC5320-MGYD6
MIC5320-MKYD6
MIC5320-MMYD6
1.8V/1.5V
1.8V/1.6V
2.5V/1.8V
2.5V/2.5V
2.6V/1.85
2.6V/1.8V
2.7V/2.7V
2.8V/1.5V
2.8V/1.8V
2.8V/2.6V
2.8V/2.8V
2.8V/2.85V
2.85V/1.85V
2.85V/2.6V
2.85V/2.85V
2.9V/1.5V
2.9V/1.8V
2.9V/2.9V
3.0V/1.8V
3.0V/2.5V
3.0V/2.6V
3.0V/2.8V
3.0V/2.85V
3.0V/3.0V
3.3V/1.5V
3.3V/1.8V
3.3V/2.5V
3.3V/2.6V
3.3V/2.7V
3.3V/2.8V
3.3V/2.85V
3.3V/2.9V
3.3V/3.0V
3.3V/3.2V
3.3V/3.3V
1.8V/1.5V
1.8V/1.6V
2.5V/1.8V
2.5V/2.5V
2.6V/1.85
2.6V/1.8V
2.7V/2.7V
2.8V/1.5V
2.8V/1.8V
2.8V/2.6V
2.8V/2.8V
–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
–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
–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
–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
–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
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin 1.6x1.6 MLF®
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
2
M9999-073106
July 2006
Micrel, Inc.
MIC5320
MIC5320-2.8/2.85YD6
MIC5320-MNYD6
MIC5320-NDYD6
MIC5320-NKYD6
MIC5320-NNYD6
MIC5320-OFYD6
MIC5320-OGYD6
MIC5320-OOYD6
MIC5320-PGYD6
MIC5320-PJYD6
MIC5320-PKYD6
MIC5320-PMYD6
MIC5320-PNYD6
MIC5320-PPYD6
MIC5320-SFYD6
MIC5320-SGYD6
MIC5320-SJYD6
MIC5320-SKYD6
MIC5320-SLYD6
MIC5320-SMYD6
MIC5320-SNYD6
MIC5320-SOYD6
MIC5320-SPYD6
MIC5320-SRYD6
MIC5320-SSYD6
2.8V/2.85V
2.85V/1.85V
2.85V/2.6V
2.85V/2.85V
2.9V/1.5V
2.9V/1.8V
2.9V/2.9V
3.0V/1.8V
3.0V/2.5V
3.0V/2.6V
3.0V/2.8V
3.0V/2.85V
3.0V/3.0V
3.3V/1.5V
3.3V/1.8V
3.3V/2.5V
3.3V/2.6V
3.3V/2.7V
3.3V/2.8V
3.3V/2.85V
3.3V/2.9V
3.3V/3.0V
3.3V/3.2V
3.3V/3.3V
–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
–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
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
MIC5320-2.85/1.85YD6
MIC5320-2.85/2.6YD6
MIC5320-2.85/2.85YD6
MIC5320-2.9/1.5YD6
MIC5320-2.9/1.8YD6
MIC5320-2.9/2.9YD6
MIC5320-3.0/1.8YD6
MIC5320-3.0/2.5YD6
MIC5320-3.0/2.6YD6
MIC5320-3.0/2.8YD6
MIC5320-3.0/2.85YD6
MIC5320-3.0/3.0YD6
MIC5320-3.3/1.5YD6
MIC5320-3.3/1.8YD6
MIC5320-3.3/2.5YD6
MIC5320-3.3/2.6YD6
MIC5320-3.3/2.7YD6
MIC5320-3.3/2.8YD6
MIC5320-3.3/2.85YD6
MIC5320-3.3/2.9YD6
MIC5320-3.3/3.0YD6
MIC5320-3.3/3.2YD6
MIC5320-3.3/3.3YD6
Note:
1. Other Voltages available. Contact Micrel for detail.
3
M9999-073106
July 2006
Micrel, Inc.
MIC5320
Pin Configuration
GND
2
VIN
3
EN2
1
VIN
GND
EN2
1
2
3
6
5
4
VOUT1
VOUT2
EN1
4
5
6
VOUT2
VOUT1
EN1
6-Pin 1.6mm x 1.6mm MLF (ML)
Top View
TSOT-23-6 (D6)
Top View
Pin Description
Pin Number
MLF-6
Pin Number
TSOT-23-6
Pin Name
Pin Function
1
2
3
3
2
1
VIN
GND
EN2
Supply Input.
Ground
Enable Input (regulator 2). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
4
6
EN1
Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
5
6
5
4
VOUT2
VOUT1
Regulator Output – LDO2
Regulator Output – LDO1
4
M9999-073106
July 2006
Micrel, Inc.
MIC5320
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN).....................................0V to +6V
Enable Input Voltage (VEN)...........................0V to +6V
Power Dissipation………………… Internally Limited(3)
Lead Temperature (soldering, 3sec)..................260°C
Storage Temperature (TS)................ –65°C to +150°C
ESD Rating(4) .........................................................2kV
Supply Voltage (VIN).............................. +2.3V to +5.5V
Enable Input Voltage (VEN).............................. 0V to VIN
Junction Temperature (TJ) ................. –40°C to +125°C
Junction Thermal Resistance
MLF-6 (θJA)..............................................100°C/W
TSOT-6 (θJA) ...........................................235°C/W
Electrical Characteristics(5)
VIN = EN1 = EN2 = VOUT + 1.0V; higher of the two regulator outputs, IOUTLDO1 = IOUTLDO2 = 100µA; COUT1 = COUT2 = 1µF;
TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.
Parameter
Conditions
Min
-2.0
-3.0
Typ
Max
+2.0
+3.0
Units
%
Output Voltage Accuracy
Variation from nominal VOUT
Variation from nominal VOUT; –40°C to +125°C
VIN = VOUT + 1V to 5.5V; IOUT = 100µA
%
Line Regulation
0.02
0.3
0.6
%/V
%/V
Load Regulation
Dropout Voltage (6)
IOUT = 100µA to 150mA
IOUT = 100µA
0.5
0.1
12
2
%
mV
mV
mV
mV
µA
I
I
I
OUT = 50mA
OUT = 100mA
OUT = 150mA
50
75
25
35
100
120
120
190
2
Ground Current
EN1 = High; EN2 = Low; IOUT = 100µA to 150mA
EN1 = Low; EN2 = High; IOUT = 100µA to 150mA
EN1 = EN2 = High; IOUT1 = 150mA, IOUT2 = 150mA
EN1 = EN2 = 0V
85
85
µA
150
0.01
65
µA
Ground Current in Shutdown
Ripple Rejection
µA
f = 1kHz; COUT = 1.0µF
dB
f=20kHz; COUT = 1.0µF
45
dB
Current Limit
VOUT = 0V
300
550
90
950
0.2
mA
µVRMS
Output Voltage Noise
Enable Inputs (EN1 / EN2)
Enable Input Voltage
COUT = 1.0µF; 10Hz to 100KHz
Logic Low
Logic High
VIL ≤ 0.2V
VIH ≥ 1.0V
V
V
1.1
Enable Input Current
0.01
0.01
1
1
µA
µA
Turn-on Time (See Timing Diagram)
Turn-on Time (LDO1 and 2)
COUT = 1.0µF
30
100
µs
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 TA (ambient temperature) is PD(max) = TJ(max) – TA) / θJA. 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 its nominal VOUT. For outputs below 2.3V,
the dropout voltage is the input-to-output differential with the minimum input voltage 2.3V.
5
M9999-073106
July 2006
Micrel, Inc.
MIC5320
Functional Diagram
VOUT 1
VOUT 2
VIN
LDO1
LDO2
EN 1
EN 2
Enable
Reference
GND
MIC5320 Block Diagram
6
M9999-073106
July 2006
Micrel, Inc.
MIC5320
Typical Characteristics
Power Supply
Rejection Ratio
Dropout Voltage
vs. Output Current
Output Voltage
vs. Temperature
-80
40
35
30
25
20
15
10
5
3.00
2.95
2.90
2.85
2.80
2.75
2.70
2.65
2.60
2.55
2.50
-70
-60
-50
150mA
-40
-30
V
V
= V
+ 1V
V
V
= V
+ 1V
IN
OUT
IN
OUT
-20
50mA
= 2.8V
= 1µF
V
V
= V
+1V
= 2.8V
= 1µF
OUT
OUT
IN
OUT
OUT
OUT
C
= 2.8V
= 1µF
C
-10 OUT
EN1 = V
C
EN1 = V
IN
OUT
IN
0
0
0.1
1
10
100
1,000
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
20 40 60 80
TEMPERATURE (°C)
FREQUENCY (kHz)
Ground Current
vs. Temperature
Ground Current
vs. Temperature
Output Voltage
vs. Input Voltage
100
95
90
85
80
75
70
100
95
90
85
80
75
70
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2.8V
100µA
150mA
1.5V
V
V
= V
+ 1V
V
V
= V
+ 1V
IN
OUT
IN
OUT
= 2.8V
= 1µF
= 2.8V
= 1µF
OUT
OUT
OUT
OUT
C
C
EN1 = V
EN2 = GND
EN1 = V
EN2 = GND
I = 100µA
OUT
IN
IN
C
= 1µF
OUT
20 40 60 80
20 40 60 80
0
1
2
3
4
5 6
INPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature
Output Voltage
vs. Output Current
Output Voltage
vs. Output Current
50
45
40
35
30
25
20
15
10
5
2.90
2.85
2.80
1.60
1.55
1.50
1.45
1.40
V
V
= V
+ 1V
IN
OUT
= 2.8V
= 1µF
150mA
100mA
OUT
OUT
C
50mA
V
V
= V
+ 1V
V
V
= V
+ 1V
IN
OUT
C
OUT
IN
OUT
= 1.5V
= C
= 2.8V
= C
2.75 OUT
= 1µF
OUT2
C
= 1µF
OUT2
OUT1
OUT1
100µA
10mA
EN1 = GND
EN1 = V
IN
EN2 = V
EN2 = GND
IN
0
2.70
20 40 60 80
TEMPERATURE (°C)
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
Ground Current
Ground Current
Current Limit
vs. Output Current
vs. Output Current
vs. Input Voltage
90
85
80
75
70
162
158
154
150
146
142
610
600
590
580
570
560
550
540
530
520
510
V
V
= V
OUT
+ 1V
V
V
= V
OUT
EN1 = V
+ 1V
IN
OUT
IN
OUT
= 2.85V
IN
= 2.85V
EN1 = EN2 = V
EN1 = V
IN
IN
C
= C
= 1µF
C
= 1µF
C
= 1µF
OUT1
OUT2
OUT
OUT1
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
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MIC5320
Typical Characteristics (continued)
Output Noise
Spectral Density
10
0.1
V
V
= 4V
IN
OUT
0.01
= 2.8V
= 1µF
C
OUT
I
= 50mA
LOAD
0.001
0.01 0.1
1
10
100 1,000
FREQUENCY (kHz)
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MIC5320
Functional Characteristics
Enable Turn-On
Load Transient
V
V
= V
+ 1V
OUT
IN
150mA
= 2.8V
= 1µF
OUT
C
OUT
V
V
= V
+ 1V
OUT
IN
10mA
= 2.8V
= 1µF
OUT
C
OUT
Time (10µs/div)
Time (40µs/div)
Line Transient
5.5V
4V
V
V
= V
+ 1V
OUT
IN
= 2.8V
= 1µF
OUT
C
OUT
OUT
I
= 10mA
Time (40µs/div)
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MIC5320
Applications Information
Enable/Shutdown
Thermal Considerations
The MIC5320 comes with dual active-high enable pins
that allow each regulator to be disabled
independently. Forcing the enable pin low disables the
regulator and sends it into a “zero” off-mode-current
state. In this state, current consumed by the regulator
goes nearly to zero. Forcing the enable pin high
enables the output voltage. The active-high enable pin
uses CMOS technology and the enable pin cannot be
left floating; a floating enable pin may cause an
indeterminate state on the output.
The MIC5320 is designed to provide 150mA of
continuous current for both outputs in a very small
package. Maximum ambient operating temperature
can be calculated based on the output current and the
voltage drop across the part. Given that the input
voltage is 3.3V, the output voltage is 2.8V for VOUT1
,
1.5V for VOUT2 and the output current = 150mA. The
actual power dissipation of the regulator circuit can be
determined using the equation:
PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) IOUT2+ VIN IGND
Input Capacitor
Because this device is CMOS and the ground current
is typically <150µA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
The MIC5320 is a high-performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 1µF capacitor is
required from the input to ground to provide stability.
Low-ESR ceramic capacitors provide optimal
performance at a minimum of space. Additional high-
frequency capacitors, such as small-valued NPO
dielectric-type capacitors, help filter out high-
frequency noise and are good practice in any RF-
based circuit.
PD = (3.3V – 2.8V) × 150mA + (3.3V -1.5) × 150mA
PD = 0.345W
To determine the maximum ambient operating
temperature of the package, use the junction-to-
ambient thermal resistance of the device and the
following basic equation:
Output Capacitor
The MIC5320 requires an output capacitor of 1µF or
greater to maintain stability. The design is optimized
for use with low-ESR ceramic chip capacitors. High
ESR capacitors may cause high frequency oscillation.
The output capacitor can be increased, but
performance has been optimized for a 1µF ceramic
output capacitor and does not improve significantly
with larger capacitance.
T
J(MAX) - TA
⎛
⎝
PD(MAX)
=
JA
TJ(max) = 125°C, the maximum junction temperature of
the die θJA thermal resistance = 100°C/W.
The table below shows junction-to-ambient thermal
resistance for the MIC5320 in different packages.
X7R/X5R dielectric-type ceramic capacitors are
recommended because of their temperature
θJA
performance.
X7R-type
capacitors
change
Recommended
capacitance by 15% over their operating temperature
range and are the most stable type of ceramic
capacitors. Z5U and Y5V dielectric capacitors change
value by as much as 50% and 60%, respectively, over
their operating temperature ranges. To use a ceramic
chip capacitor with Y5V dielectric, the value must be
much higher than an X7R ceramic capacitor to ensure
the same minimum capacitance over the equivalent
operating temperature range.
Package
θJC
Minimum
Footprint
6-Pin 1.6x1.6 MLF®
100°C/W
2°C/W
Thermal Resistance
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum
operating conditions for the regulator circuit. The
junction-to-ambient thermal resistance for the
minimum footprint is 100°C/W.
No-Load Stability
Unlike many other voltage regulators, the MIC5320
will remain stable and in regulation with no load. This
is especially important in CMOS RAM keep-alive
applications.
The maximum power dissipation must not be
exceeded for proper operation.
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MIC5320
For example, when operating the MIC5320-MFYML at
an input voltage of 3.3V and 150mA loads at each
output with a minimum footprint layout, the maximum
ambient operating temperature TA can be determined
as follows:
Therefore, a 2.8V/1.5V application with 150mA at
each output current can accept an ambient operating
temperature of 90.5°C in a 1.6mm x 1.6mm MLF®
package. For a full discussion of heat sinking and
thermal effects on voltage regulators, refer to the
“Regulator Thermals” section of Micrel’s Designing
with Low-Dropout Voltage Regulators handbook. This
information can be found on Micrel's website at:
0.345W = (125°C – TA)/(100°C/W)
TA=90.5°C
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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MIC5320
Package Information
6-Pin 1.6mm x 1.6mm MLF (ML)
6-Pin TSOT-23 (D6)
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MIC5320
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for
its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a
product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for
surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant
injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk
and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Inc.
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