MICREL MIC5320

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 highperformance; 150mA ULDOs into a tiny 6-pin 1.6mm x
1.6mm leadless MLF® package, which provides
exceptional thermal package characteristics.
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.
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.
•
•
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
Thermal shutdown protection
Current limit protection
•
•
•
•
•
•
•
•
•
•
Applications
•
•
•
•
•
•
Mobile phones
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
1µF
VIN
VOUT 1
Rx/Synth
EN 1
VOUT 2
Tx
EN 2
GND
1µF
1µF
RF
Transceiver
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
July 2006
M9999-073106
Micrel, Inc.
MIC5320
Ordering Information
Part number
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
July 2006
Manufacturing
Part Number
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
Voltage
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
2
Junction 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
–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
Package
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
M9999-073106
Micrel, Inc.
MIC5320-2.8/2.85YD6
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
MIC5320
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
Note:
1. Other Voltages available. Contact Micrel for detail.
July 2006
3
M9999-073106
Micrel, Inc.
MIC5320
Pin Configuration
VIN 1
6
VOUT1
GND 2
5
VOUT2
EN2 3
4
EN1
VIN
GND
EN2
3
2
1
4
5
6
VOUT1 VOUT2 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
3
VIN
Supply Input.
2
2
GND
Ground
3
1
EN2
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
5
VOUT2
Regulator Output – LDO2
6
4
VOUT1
Regulator Output – LDO1
July 2006
4
M9999-073106
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
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(6)
Ground Current
Ground Current in Shutdown
Ripple Rejection
Min
Typ
Max
Units
Variation from nominal VOUT
-2.0
+2.0
%
Variation from nominal VOUT; –40°C to +125°C
-3.0
+3.0
%
%/V
%/V
VIN = VOUT + 1V to 5.5V; IOUT = 100µA
0.02
0.3
0.6
IOUT = 100µA to 150mA
0.5
2
IOUT = 100µA
0.1
IOUT = 50mA
12
IOUT = 100mA
IOUT = 150mA
EN1 = High; EN2 = Low; IOUT = 100µA to 150mA
%
mV
50
mV
25
75
mV
35
100
mV
85
120
µA
EN1 = Low; EN2 = High; IOUT = 100µA to 150mA
85
120
µA
EN1 = EN2 = High; IOUT1 = 150mA, IOUT2 = 150mA
150
190
µA
EN1 = EN2 = 0V
0.01
2
µA
f = 1kHz; COUT = 1.0µF
65
dB
f=20kHz; COUT = 1.0µF
45
dB
Current Limit
VOUT = 0V
Output Voltage Noise
COUT = 1.0µF; 10Hz to 100KHz
300
550
950
90
mA
µVRMS
Enable Inputs (EN1 / EN2)
Enable Input Voltage
0.2
Logic Low
1.1
Logic High
Enable Input Current
V
V
VIL ≤ 0.2V
0.01
1
µA
VIH ≥ 1.0V
0.01
1
µA
30
100
µs
Turn-on Time (See Timing Diagram)
Turn-on Time (LDO1 and 2)
Notes:
COUT = 1.0µF
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.
July 2006
5
M9999-073106
Micrel, Inc.
MIC5320
Functional Diagram
VIN
VOUT 1
LDO1
LDO2
VOUT 2
EN 1
EN 2
Enable
Reference
GND
MIC5320 Block Diagram
July 2006
6
M9999-073106
Micrel, Inc.
MIC5320
Typical Characteristics
-80
Power Supply
Rejection Ratio
40
-70
35
-60
30
-50
150mA
-40
-30
50mA
VIN = VOUT +1V
-10 VOUT = 2.8V
COUT = 1µF
0
0.1
1
10
100
1,000
FREQUENCY (kHz)
Ground Current
vs. Temperature
95
80
75
70
90
0
0
100
85
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
EN1 = VIN
EN2 = GND
20 40 60 80
TEMPERATURE (°C)
50
VIN = VOUT + 1V
45 VOUT = 2.8V
C
40 OUT = 1µF
35
5
0
5
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
EN1 = VIN
25 50 75 100 125 150
OUTPUT CURRENT (mA)
Ground Current
vs. Temperature
75
70
2.90
1.5
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
EN1 = VIN
EN2 = GND
20 40 60 80
TEMPERATURE (°C)
Output Voltage
vs. Output Current
Output Voltage
vs. Input Voltage
2.8V
1.5V
1.0
0.5
0.0
0
1.60
IOUT = 100µA
COUT = 1µF
1
2
3
4
5
6
INPUT VOLTAGE (V)
Output Voltage
vs. Output Current
2.85
1.55
2.80
1.50
VIN = VOUT + 1V
2.75 VOUT = 2.8V
COUT1 = COUT2 = 1µF
EN1 = VIN
EN2 = GND
2.70
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
VIN = VOUT + 1V
1.45 VOUT = 1.5V
COUT1 = COUT2 = 1µF
EN1 = GND
EN2 = VIN
1.40
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
100µA
20 40 60 80
TEMPERATURE (°C)
Ground Current
vs. Output Current
162
Ground Current
vs. Output Current
158
150
VIN = VOUT + 1V
VOUT = 2.85V
EN1 = VIN
COUT1 = 1µF
25 50 75 100 125 150
OUTPUT CURRENT (mA)
146
142
0
610
600
Current Limit
vs. Input Voltage
590
580
570
560
154
July 2006
3.0
20 40 60 80
TEMPERATURE (°C)
2.0
150mA
80
70
0
2.55
2.50
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
EN1 = VIN
100mA
85
75
Output Voltage
vs. Temperature
150mA
50mA
10mA
80
2.70
2.65
2.60
2.5
90
100µA
Dropout Voltage
vs. Temperature
30
25
20
15
10
20
95
90
85
25
10
3.00
2.95
2.90
2.85
2.80
2.75
15
-20
100
Dropout Voltage
vs. Output Current
VIN = VOUT + 1V
VOUT = 2.85V
EN1 = EN2 = VIN
COUT1 = COUT2 = 1µF
25 50 75 100 125 150
OUTPUT CURRENT (mA)
7
550
540
530
520
510
3
EN1 = VIN
COUT = 1µF
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
M9999-073106
Micrel, Inc.
MIC5320
Typical Characteristics (continued)
Output Noise
Spectral Density
10
0.1
0.01
VIN = 4V
VOUT = 2.8V
COUT = 1µF
ILOAD = 50mA
0.001
0.01
July 2006
0.1
1
10
100 1,000
FREQUENCY (kHz)
8
M9999-073106
Micrel, Inc.
MIC5320
Functional Characteristics
Enable Turn-On
EN1
(1V/div)
Output Voltage
(20mV/div)
Load Transient
150mA
VIN = VOUT + 1V
VOUT = 2.8V
Output Current
(50mA/div)
COUT = 1µF
VOUT1
(1V/div)
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
10mA
Time (10µs/div)
Time (40µs/div)
Line Transient
5.5V
Input Voltage
(2V/div)
4V
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
Output Voltage
(50mV/div)
IOUT = 10mA
Time (40µs/div)
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MIC5320
Applications Information
Enable/Shutdown
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.
Input Capacitor
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 highfrequency capacitors, such as small-valued NPO
dielectric-type capacitors, help filter out highfrequency noise and are good practice in any RFbased circuit.
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.
X7R/X5R dielectric-type ceramic capacitors are
recommended because of their temperature
performance.
X7R-type
capacitors
change
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.
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.
July 2006
Thermal Considerations
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
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.
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-toambient thermal resistance of the device and the
following basic equation:
PD(MAX) =
⎛
⎝
TJ(MAX) - TA
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.
Package
6-Pin 1.6x1.6 MLF
®
θJA
Recommended
Minimum
Footprint
θJC
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.
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:
0.345W = (125°C – TA)/(100°C/W)
TA=90.5°C
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:
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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