Micrel MIC59300 Ultra high speed 3a ldo Datasheet

MIC59300
Ultra High Speed 3A LDO
General Description
Features
The MIC59300 is a high-bandwidth, low-dropout, 3A linear
voltage regulator ideal for powering core voltages of lowpower microprocessors. The MIC59300 implements a dual
supply configuration allowing for a very low output
impedance and a very fast transient response.
The MIC59300 requires a bias input supply and a main
input supply, allowing for ultra-low input voltages on the
main supply rail. The device operates from an input supply
of 1.0V to 3.8V and bias supply between 3V and 5.5V. The
MIC59300 offers fixed output voltages and adjustable
output voltages down to 0.5V.
The MIC59300 requires a minimum output capacitance for
stability, working optimally with small ceramic capacitors.
The MIC59300 is available in a 5-pin TO-263 and an 8-pin
EPAD SOIC package and its junction temperature range is
–40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• Input voltage range:
– VIN = 1.0V to 3.8V
– VBIAS = 3.0V to 5.5V
• Stable with 1µF ceramic capacitor
• ±1% initial tolerance
• Maximum dropout voltage of 500mV over temperature
• Adjustable output voltage down to 0.5V
• Ultra fast transient response
• Excellent line and load regulation specifications
• Logic controlled shutdown option
• Thermal shutdown and current limit protection
• Junction temperature range: –40°C to +125°C
• TO-263 & 8-pin EPAD SOIC
• Pin Compatible Upgrade to MIC49300
Applications
•
•
•
•
•
•
•
Telecommunications processors
Graphics processors
Computer peripheral cards
Logic IC power supply
SMPS post regulators
Microprocessors
Digital TV’s
_________________________________________________________________________________________________________
Typical Application
MIC59300YME
3, 6
VIN
CIN=1µF
(Ceramic)
VOUT
4, 5
VOUT
R1
VBIAS
2
EN
1
CBIAS=1µF
(Ceramic)
VIN
VBIAS
ADJ
EN
GND
8
EP
COUT=1µF
(Ceramic)
7
R2
9
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 2009
M9999-010809-A
Micrel, Inc.
MIC59300
Ordering Information
Part Number
Voltage(1)
Junction Temperature Range
Package
Lead Finish
MIC59300-1.2YME
1.2V
–40°C to +125°C
8-Pin EPAD SOIC
RoHS Compliant
MIC59300YME
Adj.
–40°C to +125°C
8-Pin EPAD SOIC
RoHS Compliant
MIC59300-1.2WU
1.2V
–40°C to +125°C
5-Pin TO-263
RoHS Compliant
MIC59300WU
Adj.
–40°C to +125°C
5-Pin TO-263
RoHS Compliant
Note:
1. Other Voltage available. Contact Micrel for detail.
Pin Configuration
8-Pin EPAD SOIC
MIC59300YME
8-Pin EPAD SOIC
MIC59300-1.2YME
VOUT
VOUT
VIN
VIN
GND
GND
VBIAS
VBIAS
ADJ
EN
5-Pin TO-263
MIC59300WU
January 2009
5-Pin TO-263
MIC59300-1.2WU
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Micrel, Inc.
MIC59300
Pin Description
Pin Number
Pin Number
SOIC-8
TO-263
1
1 (fixed)
EN
2
2
VBIAS
3, 6
4
VIN
4, 5
5
VOUT
7 (adjustable)
1 (adjustable)
ADJ
7 (fixed)
Pin Name
SENSE
8
3
GND
9
6
EP
January 2009
Pin Function
Enable (Input): CMOS compatible input. Logic high = enable, logic low
= shutdown.
Input bias voltage for powering all circuitry on the regulator with the
exception of the output power device.
Input voltage needed for the output power device.
Regulator Output.
Adjustable regulator feedback input. Connect to resistor voltage divider.
Connect to VOUT for fixed voltage options.
Ground.
Exposed Pad: Connect to ground pin.
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M9999-010809-A
Micrel, Inc.
MIC59300
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN) ........................................ –0.3V to +4V
Bias Supply Voltage (VBIAS)............................. –0.3V to +6V
Enable Input Voltage (VEN)............................. –0.3V to VBIAS
Power Dissipation .....................................Internally Limited
Storage Temperature (Ts) .........................–65°C to +150°C
ESD Rating(3) .................................................................. 3kV
Supply Voltage (VIN)............................................ 1V to 3.8V
Bias Supply Voltage (VBIAS)................................. 3V to 5.5V
Enable Input Voltage (VEN).................................. 0V to VBIAS
Junction Temperature (TJ) ..................–40°C ≤ TJ ≤ +125°C
Package Thermal Resistance
EPAD SOIC (θJA) ...............................................41°C/W
TO-263 (θJC)………………………………… ......6.3°C/W
Electrical Characteristics(4)
TA = 25°C with VBIAS = VOUT + 2.2V; VIN = VOUT + 1V; ILOAD = 10mA; bold values indicate 0°C ≤ TJ ≤ 85°C, unless otherwise
specified.
Parameter
Condition
Max
Units
Output Voltage Accuracy
(Fixed Voltage Options)
Room temperature
1
1
%
Over temperature range
2
2
%
Line Regulation (VIN)
VIN = VOUT + 1V to 3.8V
0.0015
0.1
%/V
Line Regulation (VBIAS)
VBIAS = 3V to 5.5V (VOUT < 0.8V)
VBIAS = VOUT + 2.2V to 5.5V (VOUT ≥ 0.8V)
0.035
0.3
%/V
Feedback Voltage
(Adjustable Output Voltage)
Room temperature
0.495
0.5
0.505
V
Over temperature range
0.490
0.5
0.510
V
Output Voltage Load Regulation
IL = 10mA to 3A (SOIC)
0.15
0.5
%
IL = 10mA to 3A (TO-263)
0.15
0.5
%
IL = 1.5A
93
250
mV
IL = 3A (SOIC)
205
400
mV
VIN – VOUT; Dropout Voltage
Min
Typ
IL = 3A (TO-263)
205
500
mV
VBIAS – VOUT; Dropout Voltage
IL = 3A
0.91
2.1
V
VBIAS supply current
VEN = 2V, IL = 100mA
VEN = 2V, IL = 3A
2
30
7.5
150
mA
mA
VBIAS shutdown current
VEN = 0V
0.1
1
µA
VIN shutdown current
VEN = 0V
0.1
1
µA
FB bias current
Adj only
0.02
1
µA
UVLO
VBIAS rising
2.85
3.0
2.7
Hysteresis
Current Limit
100
V
mV
VOUT = 0V
3.3
4.7
9.0
A
Regulator enable
Regulator shutdown
1.6
0.85
0.75
0.3
V
V
0.002
1
µA
Enable Input
Enable Input Threshold
Enable Pin Input Current
Independent of state
AC Response
Large signal bandwidth
1
MHz
PSRR (BIAS) at 10kHz
VBIAS = 3.3V, IOUT = 1.5A
45
dB
PSRR (IN) at 10kHz
VIN = VOUT + 1V, IOUT = 1.5A
VIN = VOUT + 0.3V, IOUT = 1.5A
65
55
dB
dB
145
°C
Thermal Shutdown
January 2009
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Micrel, Inc.
MIC59300
Thermal Shutdown Hysteresis
10
Turn-on Time
90
°C
300
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. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
January 2009
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M9999-010809-A
Micrel, Inc.
MIC59300
Typical Characteristics
BIAS CURRENT (mA)
35
30
25
20
15
10
VBIAS = 3V
5
VIN = 1.5V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
0
VOUT = 0.5V
OUTPUT CURRENT (A)
January 2009
1.5
VBIAS = 3.3V
VIN = 1.5V
VOUT = 1V
=3.0A
120
VOUT = 0.5V
OUT
40
30
I
=1.5A
OUT
20
10 IOUT=100mA
0.504
1.2
1.1
VIN = 1.8V
VOUT = 1V
6
VIN = 1.5V
TEMPERATURE (°C)
1.3
3.5
4
4.5
5
BIAS VOLTAGE (V)
I
50
0
Ground Current
vs. Bias Voltage
1
VBIAS = 3V
60
120
BIAS CURRENT (mA)
70
100
80
60
Bias Current
vs. Temperature
1.4
0.9
3
40
-40
120
80
Load Regulation
OUTPUT CURRENT (A)
Bias Current
vs. Output Current
VOUT = 3.45V
IOUT = 3A
100
5
VIN = 3.8V
0.2
80
2
3
4
BIAS VOLTAGE (V)
0.4
60
1
0.6
-40
0
0
VOUT = 2.5V
0.8
TEMPERATURE (°C)
FEEDBACK VOLTAGE (V)
VIN = 3V
0.5
1
0
3
1
3
Dropout Voltage vs.
Temperature (VBIAS)
TEMPERATURE (°C)
2.7
1.5
0
3A
2
1.010
1.009
1.008
1.007
1.006
1.005
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
0.3
2.5
OUTPUT VOLTAGE (V)
10mA
GROUND CURRENT (mA)
OUTPUT VOLTAGE (V)
3
Dropout Characteristics
(VBIAS)
100
OUTPUT CURRENT (A)
2.4
-40
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3
IOUT = 3A
VOUT = 1V
1.8
2.1
2.4
2.7
OUTPUT CURRENT (A)
20
50
0
0
VOUT = 3.45V
60
VOUT = 2.5V
VBIAS = 5.5V
100
2.1
0.2
150
40
VIN = 3V
200
1.8
0.4
250
20
0.6
1.2
300
1.5
0.8
Dropout Voltage vs.
Temperature (VIN)
1.2
1
1000
40
350
0.1
1
10
100
FREQUENCY (kHz)
VBIAS = 3.3V
20
0
0.01
1000
Dropout Voltage
(VBIAS)
1.2
IOUT = 1.5A
0
0.1
1
10
100
FREQUENCY (kHz)
VOUT = 1V
0
10
IOUT = 1.5A
VIN = 1.8V
-20
20
VOUT = 1V
0
0.01
30 VBIAS = 3.3V
-20
10
VIN = 1.8V
40
0.9
30 VBIAS = 3.3V
50
0.6
40
0
60
50
220
200
180
160
140
120
100
80
60
40
20
0
1.5
Dropout Voltage
(VIN)
-20
70
60
DROPOUT VOLTAGE (mV)
70
PSRR (dB)
80
20
DROPOUT VOLTAGE (V)
90
80
DROPOUT VOLTAGE (mV)
PSRR (dB)
90
Power Supply
Rejection Ratio (VBIAS)
DROPOUT VOLTAGE (V)
Power Supply
Rejection Ratio (VIN)
5.5
Feedback Voltage
vs. Input Voltage
0.503
0.502
0.501
0.500
0.499
0.498
0.497
0.496
1.5
VBIAS = 3.3V
VOUT = 1V
1.9 2.3 2.7 3.1 3.5
INPUT VOLTAGE (V)
3.9
M9999-010809-A
Micrel, Inc.
MIC59300
Typical Characteristics (continued)
0.51
January 2009
ENABLE THRESHOLD (V)
VBIAS = 3.3V
TEMPERATURE (°C)
7
120
VIN = 1.5V
100
5.5
0.492
0.49
80
3.5
4
4.5
5
BIAS VOLTAGE (V)
0.494
60
0.495
3
VOUT = 1V
0.496
40
VIN = 1.5V
0.496
0.5
0.498
20
0.498
0.497
0.504
0.502
0
0.500
0.499
1.2
0.506
-20
0.502
0.501
Feedback Voltage
vs. Temperature
0.508
-40
0.504
0.503
FEEDBACK VOLTAGE (V)
FEEDBACK VOLTAGE (V)
0.505
Feedback Voltage
vs. Bias Voltage
Enable Threshold
vs. Bias Voltage
1
0.8
0.6
0.4
0.2
0
3
VIN = 1.8V
VOUT = 1V
3.5
4
4.5
5
BIAS VOLTAGE (V)
5.5
M9999-010809-A
Micrel, Inc.
MIC59300
Functional Characteristics
January 2009
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M9999-010809-A
Micrel, Inc.
MIC59300
Functional Diagram
VBIAS
VIN
EN
Enable
Bandgap
ADJ
Ilimit
VOUT
MIC59300 (Adj) Block Diagram
VBIAS
VIN
Enable
EN
SENSE
Bandgap
R1
R2
Ilimit
VOUT
MIC59300 (Fixed) Block Diagram
January 2009
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M9999-010809-A
Micrel, Inc.
MIC59300
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 or a
tantalum capacitor to ensure the same capacitance
value over the operating temperature range. Tantalum
capacitors have a very stable dielectric (10% over their
operating temperature range) and can also be used with
this device.
Application Information
The MIC59300 is an ultra-high performance, low-dropout
linear regulator designed for high current applications
requiring a fast transient response. The MIC59300
utilizes two input supplies, significantly reducing dropout
voltage, making it perfect for low-voltage, DC-to-DC
conversion. The MIC59300 requires a minimum number
of external components, and as a μCap regulator, the
output is tolerant of virtually any type of capacitor,
including ceramic type and tantalum type capacitors.
The MIC59300 regulator is fully protected from damage
due to fault conditions, offering linear current limiting and
thermal shutdown.
Input Capacitor
An input capacitor of 1μF or greater is recommended
when the device is more than 4 inches away from the
bulk supply capacitance, or when the supply is a battery.
Small, surface-mount, ceramic chip capacitors can be
used for the bypassing. The capacitor should be placed
within 1 inch of the device for optimal performance.
Larger values will help to improve ripple rejection by
bypassing the input to the regulator, further improving
the integrity of the output voltage.
Bias Supply Voltage
VBIAS, requiring relatively light current, provides power to
the control portion of the MIC59300. VBIAS requires
approximately 30mA for a 3A load current. Dropout
conditions require higher currents. Most of the biasing
current is used to supply the base current to the pass
transistor. The bias voltage allows the pass element to
be driven into saturation, reducing the dropout to 205mV
at a 3A load current. Bypassing on the bias pin is
recommended to improve performance of the regulator
during line and load transients. Small ceramic capacitors
from VBIAS-to-ground help reduce high frequency noise
from being injected into the control circuitry from the bias
rail and constitute good design practice. Good bypass
techniques typically include one larger capacitor such as
1μF ceramic and smaller valued capacitors such as
0.01μF or 0.001μF in parallel with that larger capacitor to
decouple the bias supply. The VBIAS input voltage must
be 2.1V above the output voltage with a minimum VBIAS
input voltage of 3V.
Thermal Design
Linear regulators are simple to use. The most
complicated design parameters to consider are thermal
characteristics. Thermal design requires the following
application-specific parameters:
• Maximum ambient temperature (TA)
•
•
Output voltage (VOUT)
•
Input voltage (VIN)
• Ground current (IGND)
First, calculate the power dissipation (PD) of the
regulator from these numbers and the device
parameters from this datasheet.
Input Supply Voltage
VIN provides the high current to the collector of the pass
transistor. The minimum input voltage is 1.0V, allowing
conversion from low voltage supplies.
PD = VIN × I IN + VBIAS × I BIAS − VOUT × I OUT
The input current will be less than the output current at
high output currents as the load increases. The bias
current is a sum of base drive and ground current.
Ground current is constant over load current. Then the
heat sink thermal resistance is determined with this
formula:
Output Capacitor
The MIC59300 requires a minimum of output
capacitance to maintain stability. However, proper
capacitor selection is important to ensure desired
transient response. The MIC59300 is specifically
designed to be stable with virtually any capacitance
value and ESR. A 1μF ceramic chip capacitor should
satisfy most applications. Output capacitance can be
increased without bound. See the “Functional
Characteristics” for examples of load transient response.
X7R dielectric 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
January 2009
Output current (IOUT)
⎛ TJ ( MAX ) − T A ⎞
⎟ − (θ JC + θ CS )
⎟
PD
⎝
⎠
θ SA = ⎜⎜
The heat sink may be significantly reduced in
applications where the maximum input voltage is known
and large compared with the dropout voltage. Use a
series input resistor to drop excessive voltage and
distribute the heat between this resistor and the
regulator. The low-dropout properties of the MIC59300
allow significant reductions in regulator power dissipation
and the associated heat sink without compromising
performance. When this technique is employed, a
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M9999-010809-A
Micrel, Inc.
MIC59300
capacitor of at least 1μF is needed directly between the
input and regulator ground. Refer to “Application Note 9”
(http://www.micrel.com/_PDF/App-Notes/an-9.pdf)
for
further details and examples on thermal design and heat
sink specification.
⎛V
⎞
R 1 = R 2 × ⎜ OUT − 1⎟
⎝ 0.5
⎠
where VOUT is the desired output voltage.
Enable
An active high enable input (EN) allows on-off control of
the regulator. Current drain reduces to “zero” when the
device is shutdown, with only microamperes of leakage
current. The EN input has CMOS compatible thresholds
for simple logic interfacing. EN may be directly tied to
VBIAS and pulled up to the maximum supply voltage.
Minimum Load Current
The MIC59300, unlike most other high current
regulators, does not require a minimum load to maintain
output voltage regulation.
Adjustable Regulator Design
The MIC59300 adjustable version allows programming
the output voltage anywhere between 0.5Vand 3.3V.
Two resistors are used. The resistor value between VOUT
and the adjust pin should not exceed 10kΩ. Larger
values can cause instability. The resistor values are
calculated by:
January 2009
EPad
The exposed pad on the bottom of the SOIC part must
be connected to ground.
11
M9999-010809-A
Micrel, Inc.
MIC59300
U1
MIC59300YME
J1
VIN
1V to 3.8V
C1
1uF/6.3V
3
6
VIN
VIN
VOUT
VOUT
C2
1uF/6.3V
R1
1K
C4
OPEN
J2
GND
2
VBIAS
1
EN
ADJ
C3
1uF/6.3V
Option for Fixed VOUT
R1 = 0
Remove all Jumpers from JP2
J5
GND
7
1
J3
VBIAS
3V to 5.5V
J4
VOUT
4
5
2
GND
EP
9
R2
1K
8
3
JP1
6
8
7
D
5
C
4
B
3
R5
383
2
JP2
R4
499
1
A
R3
698
JP2 = Voltages Selector
A VOUT = 1.0V
B VOUT = 1.2V
C VOUT = 1.5V
D VOUT = 1.8V
Bill of Materials
Item
Part Number
C1,C2
C1608X5R0J105K
C3
GRM188R60J105KA01D
0603D105KAT2A
Manufacturer
TDK
(1)
Description
Qty.
1uF Ceramic Capacitor X5R 0603 6.3V
3
Open
1
Murata(2)
AVX(3)
C4
(4)
R1,R2
CRCW06031K00FKXX
Vishay
1kΩ 1% 0603 Resistor
2
R3
CRCW0603698RFKXX
Vishay(4)
698Ω 1% 0603 Resistor
1
R4
CRCW0603499RFKXX
Vishay(4)
499Ω 1% 0603 Resistor
1
R5
CRCW0603383RFKXX
(4)
383Ω 1% 0603 Resistor
1
U1
MIC59300YME
Ultra High Speed 3A LDO
1
Vishay
Micrel, Inc.(5)
Notes:
1. TDK: www.tdk.com
2. Murata Tel: www.murata.com
3. AVX Tel: www.avx.com
4. Vishay Tel: www.vishay.com
5. Micrel, Inc.: www.micrel.com
January 2009
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Micrel, Inc.
MIC59300
PCB Layout Recommendations
Top Layer
Bottom Layer
January 2009
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Micrel, Inc.
MIC59300
Package Information
8-Pin EPAD SOIC (ME)
January 2009
14
M9999-010809-A
Micrel, Inc.
MIC59300
5-Pin TO-263 (WU)
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.
© 2009 Micrel, Incorporated.
January 2009
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M9999-010809-A
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