MICREL MIC5318

MIC5318
High Performance 300mA
µCap ULDO™
General Description
Features
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 2.56mm2 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.
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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 > [email protected]
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
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Mobile phones
PDAs
GPS receivers
Portable electronics
Digital still and video cameras
Typical Application
MIC5318-x.xYMT
VIN
VIN
VOUT
EN
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
VOUT
EN
VREF
QuickStart
Error
LDO
Amp
BYP
Thermal
Shutdown
Current
Limit
GND
MIC5318 Block Diagram – Fixed
VIN
VOUT
EN
QuickStart
VREF
Error
LDO
Amp
BYP
ADJ
Thermal
Shutdown
Current
Limit
GND
MIC5318 Block Diagram – Adjustable
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MIC5318
Ordering Information
Part number
Marking Code
Output Voltage
Temperature Range
Package
MIC5318-1.5YMT
15D
1.5V
–40°C to +125°C
6-Pin 1.6 x 1.6 Thin MLF®
MIC5318-1.8YMT
18D
1.8V
–40°C to +125°C
6-Pin 1.6 x 1.6 Thin MLF®
MIC5318-2.8YMT
28D
2.8V
–40°C to +125°C
6-Pin 1.6 x 1.6 Thin MLF®
MIC5318-3.3YMT
33D
3.3V
–40°C to +125°C
6-Pin 1.6 x 1.6 Thin MLF®
MIC5318YMT
DAA
ADJ
–40°C to +125°C
6-Pin 1.6 x 1.6 Thin MLF®
MIC5318-1.5YD5
QD15
1.5V
–40°C to +125°C
5-Pin Thin SOT23
MIC5318-1.8YD5
QD18
1.8V
–40°C to +125°C
5-Pin Thin SOT23
MIC5318-2.8YD5
QD28
2.8V
–40°C to +125°C
5-Pin Thin SOT23
MIC5318-3.3YD5
QD33
3.3V
–40°C to +125°C
5-Pin Thin SOT23
MIC5318YD5
QDAA
ADJ
–40°C to +125°C
5-Pin Thin SOT23
Note:
For availability on other voltages, please contact Micrel for details.
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MIC5318
Pin Configuration
EN 1
6
BYP
GND 2
5
NC
IN 3
4
OUT
®
EN 1
6
BYP
GND 2
5
ADJ
IN 3
4
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
4
ADJ
5
OUT
5-Pin Thin SOT23 (D5)
Fixed (Top View)
5
OUT
5-Pin Thin SOT23 (D5)
Adjustable (Top View)
Pin Description
Pin No.
Thin MLF-6
Fixed
Pin No.
Thin MLF-6
Adj.
Pin No.
Thin SOT23-5
Fixed
Pin No.
Thin SOT23-5
Adj.
Pin Name
1
1
3
3
EN
2
2
2
2
GND
3
3
1
1
IN
4
4
5
5
OUT
Output Voltage.
5
–
–
–
NC
No connection.
–
5
–
4
ADJ
Adjust Input. Connect to external resistor voltage
divider network.
6
6
4
–
BYP
Reference Bypass: Connect external 0.01µF to
GND for reduced Output Noise. May be left open.
HS Pad
HS Pad
–
–
E PAD
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4
Pin Function
Enable Input. Active High. High = on, low = off.
Do not leave floating.
Ground
Supply Input.
Exposed Heatsink Pad connected to ground
internally.
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MIC5318
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN) ..................................0V to +6.5V
Enable Input Voltage (VEN)........................0V to +6.5V
Power Dissipation, Internally Limited(3)
Lead Temperature (soldering, 3sec) ..................260°C
Junction Temperature (TJ)................ –40°C to +125°C
Storage Temperature (TS) ................ –65°C to +150°C
ESD Rating(4)
Supply Voltage (VIN).............................. +2.3V to +6.0V
Enable Input Voltage (VEN).............................. 0V to VIN
Junction Temperature (TJ) ................. –40°C to +125°C
Junction Thermal Resistance
Thin MLF-6 (θJA)...................................... 100°C/W
TSOT-23-5 (θJA) ...................................... 235°C/W
Electrical Characteristics(5)
VIN = VOUT + 1.0V; COUT = 1.0µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted.
Parameter
Conditions
Min
Output Voltage Accuracy
Variation from nominal VOUT
Variation from nominal VOUT; –40°C to +125°C
Typ
Max
Units
-2.0
+2.0
%
-3.0
+3.0
%
Line Regulation
VIN = VOUT + 1V to 6.0V; IOUT = 100µA
0.02
0.6
%/V
Load Regulation, Note 6
IOUT = 100µA to 300mA
0.2
2.0
%
Dropout Voltage, Note 7
IOUT = 50mA; VOUT ≥ 2.8V
17
mV
IOUT = 150mA; VOUT ≥ 2.8V
50
100
mV
IOUT = 300mA; VOUT ≥ 2.8V
110
200
mV
Ground Pin Current, Note 8
IOUT = 0 to 300mA
85
150
µA
Ground Pin Current in
Shutdown
VEN ≤ 0.2V
0.01
1
µA
Ripple Rejection
f = up to 1kHz; COUT = 1.0µF; CBYP = 0.1µF
75
f = 1kHz – 20kHz; COUT = 1.0µF; CBYP = 0.1µF
55
340
Current Limit
VOUT = 0V
Output Voltage Noise
COUT = 1.0µF; CBYP = 0.1µF; 10Hz to 100kHz
dB
500
dB
900
30
mA
µVRMS
Enable Input
Enable Input Voltage
0.2
Logic Low
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
Turn-on Time
COUT = 1.0µF; CBYP = 0.1µF; IOUT = 150mA
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.
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.
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MIC5318
Typical Characteristics
Power Supply
Rejection Ratio
-100
-90
-80
-70
-60 300mA
150mA
-50
-40
-30 VIN = VOUT + 1V
-20 VOUT = 2.8V
50mA
C
= 1µF
-10 COUT = 0.1µF
BYP
0
0.1
1
10
100
1,000
FREQUENCY (kHz)
2.90
Output Voltage
vs. Output Current
2.85
2.80
2.75
2.70
0
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
Ground Pin Current
vs. Temperature
100
90 300mA
80
70
60
50
40
100µA
30
20
10
0
VIN = VOUT + 1V
VOUT = 1.8V
COUT = 1µF
2.1
2.5
1.9
2.0
1.8
1.5
1.7
600
580
560
540
520
500
480
460
440
420
400
2 2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
January 2007
VIN = VOUT + 1V
VOUT = 1.8V
COUT = 1µF
IOUT = 100µA
1.6
1.5
1.0
0.5
0
0
300mA
VOUT = 2.8V
COUT = 1µF
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
Dropout Voltage
vs. Temperature
Dropout Voltage
vs. Output Current
300mA
150mA
50mA
TEMPERATURE (°C)
10
100µA
TEMPERATURE (°C)
140
130 COUT = 1µF
120
110
100
90
80
70
60
50
40
30
20
10
0
110
100
90
80
70
60
50
40
30
20
10
0
0
Output Voltage
vs. Supply Voltage
3.0
2.0
TEMPERATURE (°C)
Current Limit
vs. Input Voltage
Output Voltage
vs. Temperature
Ground Pin Current
vs. Output Current
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
120
110
100
90
80
70
60
50
40
30
20
10
0
0
7
VOUT = 2.8V
COUT = 1µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
Ground Pin Current
vs. Input Voltage
110
100
90
80
300mA
100µA
70
60
50
40
30
20
10
0
2 2.5 3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
Output Noise
Spectral Density
1
0.1
0.01 VIN = 4V
VOUT = 2.8V
COUT = 1µF
CBYP = 0.1µF
0.001
0.01 0.1
1
10 100 1,000 10,000
FREQUENCY (kHz)
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MIC5318
Functional Characteristics
Line Transient
Enable Turn-On
Enable
(0.5V/div)
Input Voltage
(2V/div)
6V
3V
VOUT = 1.8V
COUT = 1µF
CBYP = 0.1µF
Output Voltage
(50mV/div)
Output Voltage
(1V/div)
VIN = VOUT + 1V
VOUT = 2.8V
COUT = 1µF
CBYP = 0.1µF
IOUT = 10mA
Time (10µs/div)
Time (40µs/div)
Output Voltage
(50mVV/div)
Load Transient
300mA
VIN = VOUT + 1V
Output Current
(100mA/div)
VOUT = 2.8V
COUT = 1µF
10mA
Time (40µs/div)
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MIC5318
bypass capacitance. A unique, quick-start circuit
allows the MIC5318 to drive a large capacitor on the
bypass pin without significantly slowing turn-on time.
Refer to the Typical Characteristics subsection for
performance with different bypass capacitors.
Application Information
Enable/Shutdown
The MIC5318 comes with an active-high enable pin
that allows the regulator to be disabled. 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.
No-Load Stability
Unlike many other voltage regulators, the MIC5318
will remain stable and in regulation with no load. This
is especially crucial for CMOS RAM keep-alive
applications.
Adjustable Regulator Application
Adjustable regulators use the ratio of two resistors to
multiply the reference voltage to produce the desired
output voltage. The MIC5318 can be adjusted from
1.25V to 5.5V by using two external resistors (Figure
1). The resistors set the output voltage based on the
following equation:
Input Capacitor
The MIC5318 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.
R1 ⎞
⎛
VOUT = VREF ⎜1 +
⎟
R2 ⎠
⎝
VREF = 1.25V
MIC5318YMT
VIN
Output Capacitor
The MIC5318 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.
R1
1µF
EN
ADJ
GND
1µF
R2
Figure 1. Adjustable Voltage Output
Thermal Considerations
The MIC5318 is designed to provide 300mA of
continuous current. 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 and the output current = 300mA.
The actual power dissipation of the regulator circuit
can be determined using the equation:
PD = (VIN – VOUT) IOUT + 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 = (3.3V – 2.8V) × 300mA
PD = 0.15W
To determine the maximum ambient operating
temperature of the package, use the junction-toambient thermal resistance of the device and the
following basic equation:
Bypass Capacitor
A capacitor can be placed from the noise bypass pin
to ground to reduce output voltage noise. The
capacitor bypasses the internal reference. A 0.1µF
capacitor is recommended for applications that require
low-noise outputs. The bypass capacitor can be
increased, further reducing noise and improving
PSRR. Turn-on time increases slightly with respect to
January 2007
VOUT
VIN VOUT
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MIC5318
PD(MAX) =
⎛
⎝
The maximum power dissipation must not be
exceeded for proper operation.
For example, when operating the MIC5318-2.8YMT at
an input voltage of 3.3V and 300mA load with a
minimum footprint layout, the maximum ambient
operating temperature TA can be determined as
follows:
0.15W = (125°C – TA)/(100°C/W)
TA = 110°C
Therefore, a 2.8V application with 300mA of output
current can accept an ambient operating temperature
of 110°C in a 1.6mm x 1.6mm Thin 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 LowDropout Voltage Regulators handbook. This information can be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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 MIC5318 in the 6-pin 1.6mm x
1.6mm Thin MLF® package.
θJA Recommended
Minimum Footprint
Package
6-Pin 1.6x1.6 Thin MLF
®
100°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.
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MIC5318
Package Information
®
6-Pin 1.6mm x 1.6mm Thin MLF (MT)
5-Pin TSOT-23 (D5)
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MIC5318
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.
© 2006 Micrel, Inc.
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