MIC59150
Ultra High Speed 1.5A LDO
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
December 2008 M9999-121808-A
General Description
The MIC59150 is a high-bandwidth, low-dropout, 1.5A
linear voltage regulator ideal for powering core voltages of
low-power microprocessors. The MIC59150 implements a
dual supply configuration allowing for a very low output
impedance and a very fast transient response.
The MIC59150 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
MIC59150 offers adjustable output voltages down to 0.5V.
The MIC59150 requires a minimum output capacitance for
stability, working optimally with small ceramic capacitors.
The MIC59150 is available in 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.
Features
• Input voltage range:
– VIN = 1.0V to 3.8V
– VBIAS = 3.0V to 5.5V
• Stable with 1µF ceramic capacitor
• Maximum dropout voltage of 250mV 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
• 8-pin EPAD SOIC
Applications
• Telecommunications processors
• Graphics processors
• Computer peripheral cards
• Logic IC power supply
• SMPS post regulators
• Microprocessors
• Digital TV’s
_________________________________________________________________________________________________________
Typical Application
VIN
VBIAS
VOUT
ADJ
EN
GND
VIN
V
BIA
S
EN
CIN=1µF
(Ceramic)
CBIAS=1µF
(Ceramic)
COUT=1µF
(Ceramic)
R1
R2
VOUT
MIC59150YM
E
Micrel, Inc. MIC59150
December 2008 2 M9999-121808-A
Ordering Information
Part Number Voltage(1) Junction Temperature Range Package Lead Finish
MIC59150YME Adj. –40°C to +125°C 8-Pin EPAD SOIC RoHS Compliant
Note:
1. Other Voltage available. Contact Micrel for detail.
Pin Configur ation
1
2
3
4
8
7
6
5
GND
ADJ
VIN
VOU
T
EN
V
BIA
S
VIN
VOUT
8-Pin EPAD SOIC (ME)
Pin Description
Pin Number Pin Name Pin Function
1 EN Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown.
2 VBIAS
Input bias voltage for powering all circuitry on the regulator with the exception of the
output power device.
3, 6 VIN Input voltage needed for the output power device.
4, 5 VOUT Regulator Output.
7 ADJ Adjustable regulator feedback input. Connect to resistor voltage divider.
8 GND Ground.
Micrel, Inc. MIC59150
December 2008 3 M9999-121808-A
Absolute Maximum Ratings(1)
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
Operating Ratings(2)
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
Electrical Characteristics(4)
TA = 25°C with VBIAS = VOUT + 2.2V; VIN = VOUT + 1V; bold values indicate 0°C ≤ TJ ≤ 85°C, unless otherwise specified.
Parameter Condition Min Typ Max Units
Line Regulation (VIN) VIN = VOUT + 1V to 3.8V, ILOAD = 10mA 0.002 ±0.1 %/V
Line Regulation (VBIAS) VBIAS = 3V to 5.5V (VOUT < 0.8V), ILOAD = 10mA
VBIAS = VOUT + 2.2V to 5.5V (VOUT ≥ 0.8V), ILOAD = 10mA
0.026
±0.3 %/V
Room temperature 0.495 0.5 0.505 V
Feedback Voltage
(Adjustable Output Voltage) Over temperature range 0.490 0.5 0.510 V
Output Voltage Load Regulation IL = 10mA to 1.5A 0.1 0.5 %
VIN – VOUT; Dropout Voltage IL = 750mA
IL = 1.5A
65
100
150
250 mV
mV
VBIAS – VOUT; Dropout Voltage IL = 1.5A 0.85 2.1 V
VBIAS supply current VEN = 2V, IL = 100mA
VEN = 2V, IL = 1.5A
1.3
12.5
7.5
75 mA
mA
VBIAS shutdown current VEN = 0V 0.02 1 µA
VIN shutdown current VEN = 0V 0.04 1 µA
FB bias current 0.03 1 µA
VBIAS rising 2.7 2.84 3.0 V UVLO
Hysteresis 100 mV
Current Limit VOUT = 0V 1.8 3.1 6.0 A
Enable Input
Enable Input Threshold Regulator enable
Regulator shutdown
1.6 0.85
0.75
0.3 V
V
Enable Pin Input Current Independent of state 0.012 1 µA
AC Response
Large signal bandwidth 1 MHz
PSRR (BIAS) at 10kHz VBIAS = 3.3V, IOUT = 750mA 46 dB
PSRR (IN) at 10kHz VIN = VOUT + 1V, IOUT = 750mA
VIN = VOUT + 0.3V, IOUT = 750mA
60
55
dB
dB
Thermal Shutdown 145 °C
Thermal Shutdown Hysteresis 12 °C
Turn-on Time 85 300 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.
Micrel, Inc. MIC59150
December 2008 4 M9999-121808-A
Typical Characteristics
0
10
20
30
40
50
60
70
80
0.01 0.1 1 10 100 1000
PSRR (dB)
FREQUENCY (kHz)
Power Supply
Rejection Ratio (VIN)
VBIAS = 3.3V
VIN = 1.8V
VOUT = 1V
IOUT = 0.75A
0
10
20
30
40
50
60
70
80
90
0.01 0.1 1 10 100 1000
PSRR (dB)
FREQUENCY (kHz)
Power Supply
Rejection Ratio (VBIAS)
VBIAS = 3.3V
VIN = 1.8V
VOUT = 1V
IOUT = 0.75A
0
20
40
60
80
100
120
140
160
0.75 1 1.25 1.5
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (A)
Dropout Voltage
(VIN)
VBIAS = 3.3V
VOUT = 1V
0
0.2
0.4
0.6
0.8
1
1.2
0 0.2 0.4 0.6 0.8 1 1.2 1.4
DROPOUT VOLTAGE (V)
OUTPUT CURRENT (A)
VIN = 3V
VOUT = 2.5V
Dropout Voltage
(VBIAS)
0
20
40
60
80
100
120
140
160
-40
-20
0
20
40
60
80
100
120
DROPOUT VOLTAGE (mV)
TEMPERATURE (°C)
Dropout Voltage vs.
Temperature (VIN)
VBIAS = 5.5V
VOUT = 3.45V
IOUT = 1.5A
0
0.2
0.4
0.6
0.8
1
1.2
-40
-20
0
20
40
60
80
100
120
DROPOUT VOLTAGE (V)
TEMPERATURE (°C)
Dropout Voltage vs.
Temperature (VBIAS)
VIN = 3.8V
VOUT = 3.45V
IOUT = 1.5A
0
0.5
1
1.5
2
2.5
3
012345
OUTPUT VOLTAGE (V)
BIAS VOLTAGE (V)
Dropout Characteristics
(VBIAS)
10mA
1.5A
VIN = 3V
VOUT = 2.5V
0.995
0.996
0.997
0.998
0.999
1
1.001
1.002
1.003
1.004
1.005
0 0.2 0.4 0.6 0.8 1 1.2 1.4
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Load Regulation
VBIAS = 3.3V
VIN = 1.5V
VOUT = 1V
0
5
10
15
20
25
30
-40
-20
0
20
40
60
80
100
120
BIAS CURRENT (mA)
TEMPERATURE (°C)
Bias Current
vs. Temperature
IOUT=100mA
IOUT=0.75A
IOUT=1.5A
VBIAS = 3V
VIN = 1.5V
VOUT = 0.5V
Bias Current
vs. Output Current
0
4
8
12
16
20
0 0.2 0.4 0.6 0.8 1 1.2 1.4
BIAS CURRENT (mA)
OUTPUT CURRENT (A)
VBIAS = 3.3V
VIN = 1.5V
VOUT = 1V
0
0.1
0.2
0.3
0.4
0.5
0.6
33.544.555.5
GROUND CURRENT (mA)
BIAS VOLTAGE (V)
Ground Current
vs. Bias Voltage
VIN = 1.8V
VOUT = 1V
0.498
0.499
0.5
0.501
0.502
1.5 1.9 2.3 2.7 3.1 3.5 3.9
FEEDBACK VOLTAGE (V)
INPUT VOLTAGE (V)
Feedback Voltage
vs. Input Voltage
VBIAS = 3.3V
VOUT = 1V
Micrel, Inc. MIC59150
December 2008 5 M9999-121808-A
Typical Characteristics (continued)
0.495
0.496
0.497
0.498
0.499
0.5
0.501
0.502
0.503
0.504
0.505
33.544.555.5
FEEDBACK VOLTAGE (V)
BIAS VOLTAGE (V)
Feedback Voltage
vs. Bias Voltage
VIN = 1.8V
VOUT = 1V
0.49
0.492
0.494
0.496
0.498
0.5
0.502
0.504
0.506
0.508
0.51
-40
-20
0
20
40
60
80
100
120
FEEDBACK VOLTAGE (V)
TEMPERATURE (°C)
FeedbackVoltage
vs. Temperature
VBIAS = 3.3V
VIN = 1.5V
0
0.2
0.4
0.6
0.8
1
1.2
33.544.555.5
ENABLE THRESHOLD (V)
BIAS VOLTAGE (V)
Enable Threshold
vs. Bias Voltage
VIN = 1.8V
VOUT = 1V
Micrel, Inc. MIC59150
December 2008 6 M9999-121808-A
Functional Characteristics
Micrel, Inc. MIC59150
December 2008 7 M9999-121808-A
Functional Diagram
VOUT
Enable Bandgap
VBIAS
VIN
Ilimit
EN
A
DJ
MIC59150 Block Diagram
Micrel, Inc. MIC59150
December 2008 8 M9999-121808-A
Application Information
The MIC59150 is an ultra-high performance, low-dropout
linear regulator designed for high current applications
requiring a fast transient response. The MIC59150
utilizes two input supplies, significantly reducing dropout
voltage, making it perfect for low-voltage, DC-to-DC
conversion. The MIC59150 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 MIC59150 regulator is fully protected from damage
due to fault conditions, offering linear current limiting and
thermal shutdown.
Bias Supply Voltage
VBIAS, requiring relatively light current, provides power to
the control portion of the MIC59150. VBIAS requires
approximately 12mA for a 1.5A load current. Dropout
conditions require higher currents. Most of the biasing
current is used to supply the base current to the pass
transistor. This allows the pass element to be driven into
saturation, reducing the dropout to 100mV at a 1.5A 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
are 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.
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.
Output Capacitor
The MIC59150 requires a minimum of output
capacitance to maintain stability. However, proper
capacitor selection is important to ensure desired
transient response. The MIC59150 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” subsection 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
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.
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" 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.
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 current (IOUT)
• 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.
OUTOUTBIASBIASININD IVIVIVP
×
−×
+
×
=
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:
()
CSJC
D
AMAXJ
SA PTT
θθθ
+−
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−
=)(
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 MIC59150
allow significant reductions in regulator power dissipation
and the associated heat sink without compromising
Micrel, Inc. MIC59150
December 2008 9 M9999-121808-A
performance. When this technique is employed, a
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.
Minimum Load Current
The MIC59150, unlike most other high current
regulators, does not require a minimum load to maintain
output voltage regulation.
Adjustable Regulator Design
The MIC59150 adjustable version allows programming
the output voltage anywhere between 0.5Vand 3.5V.
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:
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−×= 1
5.0
21 OUT
V
RR
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.
Micrel, Inc. MIC59150
December 2008 10 M9999-121808-A
J5
GND
R1
1K
13
2
JP1
C1
1uF/6.3V
C2
1uF/6.3V
C3
1uF/6.3V
C4
OPEN
VIN
3
GND
8
VOUT 4
ADJ 7
EN
1
VIN
6
VBIAS
2
VOUT 5
U1
MIC59150YME
R2
1K
R3
698
R4
499
R5
383
12
34
56
78
JP2
A
JP2 = Voltages Selector
AVOUT =1.0V
BVOUT =1.2V
CVOUT =1.5V
DVOUT =1.8V
J4
VOUT
J2
GND
J3
VBIAS
3V to 5.5V
J1
VIN
1V to 3.8V
BCD
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1608X5R0J105K TDK(1)
GRM188R60J105KA01D Murata(2)
C1,C2
C3
0603D105KAT2A AVX(3)
1uF Ceramic Capacitor X5R 0603 6.3V 3
C4 Open 1
R1,R2 CRCW06031K00FKXX Vishay(4) 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 Vishay(4) 383Ω 1% 0603 Resistor 1
U1 MIC59150YME Micrel, Inc.(5) Ultra High Speed 1.5A LDO 1
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
Micrel, Inc. MIC59150
December 2008 11 M9999-121808-A
PCB Layout Recommendations
Top Layer
Bottom Layer
Micrel, Inc. MIC59150
December 2008 12 M9999-121808-A
Package Information
8-Pin EPAD SOIC (ME)
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.
