MIC5331 - Micro-Power High Performance Dual 300mA ULDO

MIC5331
Micro-Power High Performance
Dual 300mA ULDO™
General Description
Features
The MIC5331 is a tiny dual low quiescent current LDO
ideal for applications that are power sensitive. The
MIC5331 integrates two high performance, 300mA LDOs
into a tiny 2mm x 2mm Thin MLF® package, which
occupies less PC board area than a single SOT-23
package.
The MIC5331 is designed to reject input noise and provide
low output noise with fast transient response to any load
change quickly even though it is a low quiescent current
part. This combination of PSRR, low noise and transient
response along with low power consumption makes for a
very high performance, yet general purpose product.
The MIC5331 is a µCap design, operating with very small
ceramic output capacitors, which reduces required board
space and component cost; and it is available in fixed
output voltages in the tiny 8-pin 2mm x 2mm Thin MLF®
leadless package.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
•
•
•
•
•
•
•
•
•
•
2.3V to 5.5V input voltage range
300mA output current per LDO
Very low quiescent current: 25µA per LDO
High PSRR - >65dB on each LDO
Stable with 1µF ceramic output capacitors
Tiny 8-pin 2mm x 2mm Thin MLF® package
Ultra-low dropout voltage – 120mV @ 300mA
Low output voltage noise – 50µVrms
Thermal shutdown protection
Current limit protection
Applications
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•
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Camera phones
Mobile phones
PDAs
GPS receivers
Portable devices
___________________________________________________________________________________________________________
Typical Application
MIC5331-xxYMT
VBAT
1µF
VIN
VOUT1
I/O
EN1
VOUT2
CORE
EN2
GND
1µF
1µF
Camera DSP
Camera DSP 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
February 2008
M9999-021408-A
Micrel, Inc.
MIC5331
Ordering Information
Part Number
Manufacturing
Part Number
Marking
Voltage
Junction
Temperature Range
Package
MIC5331-1.8/1.2YMT
MIC5331-G4YMT
UG4
1.8V/1.2V
–40° to +125°C
8-Pin 2mm x 2mm Thin MLF®
MIC5331-2.5/1.2YMT
MIC5331-J4YMT
UJ4
2.5V/1.2V
–40° to +125°C
8-Pin 2mm x 2mm Thin MLF®
MIC5331-2.8/2.8YMT
MIC5331-MMYMT
UMM
2.8V/2.8V
–40° to +125°C
8-Pin 2mm x 2mm Thin MLF®
MIC5331-2.8/2.85YMT
MIC5331-MNYMT
UMN
2.8V/2.85V
–40° to +125°C
8-Pin 2mm x 2mm Thin MLF®
MIC5331-2.85/2.85YMT
MIC5331-NNYMT
UNN
2.85V/2.85V
–40° to +125°C
8-Pin 2mm x 2mm Thin MLF®
MIC5331-3.0/2.8YMT
MIC5331-PMYMT
UPM
3.0V/2.8V
–40° to +125°C
8-Pin 2mm x 2mm Thin MLF®
MIC5331-3.0/2.85YMT
MIC5331-PNYMT
UPN
3.0V/2.85V
–40° to +125°C
8-Pin 2mm x 2mm Thin MLF®
MIC5331-3.0/3.0YMT
MIC5331-PPYMT
UPP
3.0V/3.0V
–40° to +125°C
8-Pin 2mm x 2mm Thin MLF®
Note: Other voltage options available. Contact Micrel for details.
Pin Configuration
VIN
1
8
VOUT1
GND
2
7
VOUT2
NC
3
6
NC
EN2
4
5
EN1
8-Pin 2mm x 2mm Thin MLF® (MT)
(Top View)
Pin Description
Pin Number
Pin Name
Pin Function
1
VIN
Supply Input.
2
GND
Ground.
3
NC
Not Internally Connected.
4
EN2
Enable Input (Regulator 2): Active High Input. Logic High = On; Logic Low =
Off. Do not leave floating.
5
EN1
Enable Input (Regulator 1): Active High Input. Logic High = On; Logic Low =
Off. Do not leave floating.
6
NC
Not Internally Connected.
7
VOUT2
Regulator Output – LDO2.
8
VOUT1
Regulator Output – LDO1.
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Micrel, Inc.
MIC5331
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN) ............................................. 0V to +6V
Enable Input Voltage (VEN1, VEN2) .......................... 0V to VIN
Power Dissipation .................................. Internally Limited(3)
Lead Temperature (soldering, 3sec.)......................... 260°C
Storage Temperature (Ts) .........................–65°C to +150°C
ESD Sensitive(4)
Supply Voltage (VIN)..................................... +2.3V to +5.5V
Enable Input Voltage (VEN1, VEN2) .......................... 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Junction Thermal Resistance
2mm x 2mm Thin MLF-8 (θJA) ...........................90°C/W
Electrical Characteristics(5)
VIN = VEN1 = VEN2 = VOUT + 1.0V, higher of the two regulator outputs; IOUT1 = IOUT2 = 100µA; COUT1 = COUT2 = 1µF;
TJ = 25°C, bold values indicate –40°C < TJ < +125°C; unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Condition
Min
Typ
Max
Units
%
Variation from nominal VOUT
–1.0
+1.0
Variation from nominal VOUT; –40°C to +125°C
–2.0
+2.0
%
0.3
%/V
0.6
%/V
VIN = VOUT +1V to 5.5V; IOUT = 100µA
0.02
Load Regulation
IOUT = 100µA to 300mA
0.2
0.5
%
Dropout Voltage
IOUT = 50mA
20
40
mV
IOUT = 300mA
120
240
mV
VEN1 = High; VEN2 = Low; IOUT = 100µA to 300mA
25
50
µA
VEN1 = Low; VEN2 = High; IOUT = 100µA to 300mA
25
50
µA
40
75
µA
0.01
1.0
µA
Ground Current
VEN1 = VEN2 = High; IOUT1= 300mA, IOUT2 = 300mA
Ground Current in Shutdown
VEN1 = VEN2 < 0.2V
Ripple Rejection
f = 1kHz; COUT = 2.2µF
65
f = 20kHz; COUT = 2.2µF
Current Limit
VOUT = 0V
Output Voltage Noise
COUT=1µF; 10Hz to 100kHz
dB
45
350
550
dB
800
50
mA
µVRMS
Enable Inputs (EN1/EN2 )
Enable Input Voltage
Logic Low
0.2
Logic High
Enable Input Current
V
V
1.2
VIL ≤ 0.2V
0.01
1.0
µA
VIH ≥ 1.2V
0.01
1.0
µA
COUT = 1µF (Enable of First LDO)
140
500
µs
COUT = 1µF (Enable of Second LDO after First Enabled)
110
500
µs
Turn-on Time
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 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, 1.5kΩ in series with 100pF.
5. Specification for packaged product only.
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MIC5331
Typical Characteristics
PSRR
-100
-90
PSRR
-80
50mA
-80
0.10
-60
-50
300mA
0.06
-30
-20 VIN = 2.3V
V
= 1.2V
-10 OUT
COUT = 2.2µF
0
-20 VIN = 2.3V
-10 VOUT = 1.2V
COUT = 1µF
0
Dropout Voltage
vs. Temperature
Ground Current
vs. Supply Voltage
40
38
300mA
0.12
0.08
100mA
0.06
0.04
50mA
0.02
10mA
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Ground Current
vs. Temperature
39
10mA
100mA
300mA
EN1 = EN2 = VIN
VIN = VOUT + 1V
33
VOUT = 2.8V
COUT = 1µF
30
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
850
800
20
2
2.820
42
Current Limit
vs. Supply Voltage
39
Single LDO Enabled
27
2.5 3 3.5 4 4.5 5
SUPPLY VOLTAGE (V)
5.5
Output Voltage
vs. Load Current
25
0
3.0
2.8
2.808
2.7
2.800
0
1.0
700
650
0.8
Ground Current
vs. Load Current
Dual LDO Enabled
35 VIN = VOUT + 1V
VOUT1 = 2.5V
33 VOUT2 = 1.2V
31 COUT1 = 1µF
COUT2 = 1µF
29
2.812
2.804
50 100 150 200 250 300
LOAD CURRENT (mA)
37
2.9
750
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
50 100 150 200 250 300
LOAD CURRENT (mA)
2.6
Single LDO Enabled
50 100 150 200 250 300
LOAD CURRENT (mA)
Output Voltage
vs. Temperature
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
2.5
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Output Noise
Spectral Density
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
Load = 50mA
0.6
0.4
500
450
400
350
2
41
Dual LDO Enabled
2.816
1.2
600
550
0
0
36 VOUT1 = 2.5V
34 VOUT2 = 1.2V
32 COUT1 = 1µF
C
= 1µF
30 OUT2
IOUT1 = 300mA
28 I
OUT2 = 300mA
26
24
22
VOUT = 2.8V
COUT = 1µF
0.02
FREQUENCY (Hz)
0.10
36
0.04
FREQUENCY (Hz)
VOUT = 2.8V
0.16 COUT = 1µF
0.14
45
0.08
300mA
-40
-30
0.18
0.12
50mA
-70
-70
-60
-50
-40
0.14
-90
Dropout Voltage
vs. Load Current
CIN = 1µF
COUT = 1µF
2.5 3 3.5 4 4.5 5
SUPPLY VOLTAGE (V)
February 2008
5.5
0.2
0
10
100
1K
10K 100K
FREQUENCY (Hz)
4
1M
M9999-021408-A
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MIC5331
Functional Characteristics
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MIC5331
Functional Diagram
VIN
VOUT1
LDO1
LDO2
EN1
EN2
VOUT2
Reference
Enable
Thermal
Shutdown
GND
MIC5331 Block Diagram
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MIC5331
the enable pin cannot be left floating; a floating enable
pin may cause an indeterminate state on the output.
Application Information
MIC5331 is a tiny dual low quiescent current 300mA
LDO. The MIC5331 regulator is fully protected from
damage due to fault conditions, offering linear current
limiting and thermal shutdown.
Thermal Considerations
The MIC5331 is designed to provide 300mA 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. For example if the input
voltage is 3.6V, the output voltage is 3.0V for VOUT1, 2.8V
for VOUT2 and the output current = 300mA. The actual
power dissipation of the regulator circuit can be
determined using the equation:
PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) I OUT2 + VIN IGND
Because this device is CMOS and the ground current is
typically <100µA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
PD = (3.6V – 3.0V) × 300mA + (3.6V -2.8) × 300mA
PD = 0.42W
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:
Input Capacitor
The MIC5331 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 high-frequency
noise and are good practice in any RF-based circuit.
X5R or X7R dielectrics are recommended for the input
capacitor. Y5V dielectrics lose most of their capacitance
over temperature and are therefore, not recommended.
Output Capacitor
The MIC5331 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.
⎛ TJ(MAX) − TA
PD(MAX) = ⎜⎜
θ JA
⎝
TJ(max) = 125°C, and the maximum junction temperature
of the die, θJA, thermal resistance = 90°C/W.
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit. The junction-toambient thermal resistance for the minimum footprint is
90°C/W.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC5331-PMYMT at
an input voltage of 3.6V and 300mA loads at each output
with a minimum footprint layout, the maximum ambient
operating temperature TA can be determined as follows:
0.42W = (125°C – TA)/(90°C/W)
TA = 87.2°C
Therefore, a 3.0V/2.8V application with 300mA at each
output current can accept an ambient operating
temperature of 87°C in a 2mm x 2mm 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
No-Load Stability
Unlike many other voltage regulators, the MIC5331 will
remain stable and in regulation with no load. This is
especially important in CMOS RAM keep-alive
applications.
Enable/Shutdown
The MIC5331 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
February 2008
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⎟
⎟
⎠
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MIC5331
MIC5331 Typical Application Circuit
U1
MIC5331-xxYMT
VIN
J1
VIN
1
R3
10k
VIN
VOUT1
NC
VOUT2
8
J6
VOUT1
7
J8
VOUT2
R2
10k
3
J4
EN2
4
J5
EN1
5
EN2
EN1
NC
GND
C1
1µF
6
C2
1µF
2
C3
1µF
J2
GND
J7
GND
Bill of Materials
Item
Part Number
C1, C2, C3
R2, R3
C1608X5R0J105K
CRCW06031002FKEYE3
U1
MIC5331-XXYMT
Manufacturer
(1)
TDK
(2)
Vishay
Micrel
(3)
Description
Qty
Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603
3
Resistor, 10kΩ, 1%, 1/16W, Size 0603
2
®
UCAP Dual 300mA LDO, Size 2mm x 2mm Thin MLF
1
Notes:
1.
TDK: www.tdk.com
2.
Vishay: www.vishay.com
3.
Micrel, Inc.: www.micrel.com
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MIC5331
PCB Layout Recommendations
1350 (mil)
1400 (mil)
Top Layer
1350 (mil)
1400 (mil)
Bottom Layer
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MIC5331
Package Information
8-Pin 2mm x 2mm Thin MLF® (MT)
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.
© 2008 Micrel, Incorporated.
February 2008
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