MIC49500-0.9WR-TR [MICROCHIP]
FIXED POSITIVE LDO REGULATOR;
| 型号： | MIC49500-0.9WR-TR |
| 厂家： | 
MICROCHIP |
| 描述： | FIXED POSITIVE LDO REGULATOR 输出元件 调节器 |
| 文件： | 总11页 (文件大小：216K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC49500
5A Dual Supply, Low Voltage,
High Bandwidth LDO
General Description
Features
The MIC49500 is an ultra-high-bandwidth, low-
dropout, 5.0A voltage regulator ideal for powering
core voltages of low-voltage microprocessors. The
MIC49500 implements a dual supply configuration
allowing for very low output impedance and very fast
transient response.
• Input voltage range:
–
–
VIN: 1.4V to 6V
VBIAS: 3.0V to 6V
• Stable with 10µF ceramic output capacitor
• +1.0% initial output tolerance
• Maximum dropout (VIN – VOUT) is 500mV over
temperature
The MIC49500 requires a bias input supply and a
main input supply, allowing for ultra-low input voltages
on the main supply rail. The input supply operates
from 1.4V to 6V and the bias supply requires between
3V and 6V for proper operation. The MIC49500 can
regulate to an output voltage as low as 0.7V, making it
an ideal product for low-voltage to low-voltage
conversion.
• Adjustable output voltage down to 0.7V
• Ultra Fast Transient Response (Up to 10MHz
bandwidth)
• Excellent line and load regulation specifications
• Logic controlled shutdown option
• Thermal shutdown and current limit protection
• Thin 7-pin S-Pak package
• TO-263 7-pin package
• –40°C to +125°C operating junction temperature
range
The MIC49500 requires
a minimum of output
capacitance for stability, working optimally with any
type of capacitor, including small ceramic capacitors.
Available in fixed output voltages from 0.9V to 1.8V
and adjustable output voltages down to 0.7V, the
MIC49500 comes in both 7-pin S-Pak and TO-263
packages. The MIC49500 is rated to the full operating
temperature range of –40°C to 125°C junction
temperature.
Applications
• ASIC Core Voltage Regulator
• PLD/FPGA Core Power Supply
• Linear Point-of-Load Conversion
• High Speed Post-Regulator
Typical Application
MIC49500WR
Load Transient
V
IN = 2.0V
VOUT = 1.0V
R1
OUT
IN
OFF ON
EN
ADJ
V
V
= 1.8V
= 3.9V
BIAS
OUT
VBIAS = 3.1V
= 2.8V
COUT = 10µF
Ceramic
IN
V
C
R2
BIAS
= C
= 10µF
OUT
BIAS
CBIAS = 1µF
Ceramic
GND
5A
C
IN = 1µF
0A
Ceramic
Low Voltage,
Fast Transient Response Regulator
Time (10µs/div)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-071307
July 2007
Micrel, Inc.
MIC49500
Block Diagram
VBIAS
VIN
Ilimit
ADJ
Bandgap
EN
Enable
SNS / ADJ
VOUT
FIX (SNS)
ADJ
FIX
GND
2
M9999-071307
July 2007
Micrel, Inc.
MIC49500
Ordering Information
Part Number*
Voltage
0.9V
1.2V
ADJ
Junction Temperature Range
–40°C to +125°C
Package
S-Pak-7
S-Pak-7
S-Pak-7
TO-263
TO-263
TO-263
Lead Finish*
MIC49500-0.9WR
MIC49500-1.2WR
MIC49500WR
RoHS Compliant
RoHS Compliant
RoHS Compliant
RoHS Compliant
RoHS Compliant
RoHS Compliant
–40°C to +125°C
–40°C to +125°C
MIC49500-0.9WU
MIC49500-1.2WU
MIC49500WU
0.9V
1.2V
ADJ
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Other Voltage available. Contact Micrel for details.
* RoHS compliant with ‘high-melting solder’ exemption.
Pin Configuration
7
6
5
4
3
2
1
VSNS/ADJ
NC
VOUT
GND
VIN
VBIAS
EN
7
6
5
4
3
2
1
VSNS/ADJ
NC
VOUT
GND
VIN
VBIAS
EN
MIC49500WR (S-Pak-7)
MIC49500WU (TO263-7)
Pin Description
Pin Number
S-Pak-7
Pin Name
(Fixed)
Pin Name
(Adj)
Pin Function
1
2
3
EN
VBIAS
VIN
EN
VBIAS
VIN
Enable: TTL/CMOS compatible input. Logic high = enable,
logic low or open = shutdown.
Bias Supply: Bias supply input for powering all internal circuitry of
the device, except the main current path.
Input Voltage: Main Power Input Supply. Supplies main current
to output device.
4
5
6
7
GND
VOUT
NC
GND
Ground (TAB is connected to Ground).
Output Voltage: Regulator Output.
No Connect
VOUT
VSNS
-
Remote Voltage Sense: Connect direct the load to improve
regulation. Connect direct to pin 5 if not used.
7
-
ADJ
Adjust Input. Connect external resistor divider to program output
voltage.
3
M9999-071307
July 2007
Micrel, Inc.
MIC49500
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN)............................................. 6.5V
Bias Supply Voltage (VBIAS).................................. 6.5V
Enable Input Voltage (VEN)................................... 6.5V
Power Dissipation............................. Internally Limited
Junction Temperature .................-40°C ≤ TJ ≤ +125°C
Storage Temperature (TS)........... -65°C ≤ TJ ≤ 150°C
Lead Temperature (soldering, 5 sec.)................260°C
ESD Rating(3) .........................................................3kV
Supply voltage (VIN).......................................1.4V to 6V
Bias Supply Voltage (VBIAS)..............................3V to 6V
Enable Input Voltage (VEN)........................... 0V to VBIAS
Junction Temperature Range........-40°C ≤ TJ ≤ +125°C
Package Thermal Resistance
S-Pak (θJC) ................................................. 2°C/W
TO-263 (θJC) ............................................... 2°C/W
Electrical Characteristics(4)
VIN = VOUT + 1.0V; VBIAS = VOUT + 2.1V; COUT = 10µF; IOUT = 10mA; TJ = 25°C, bold values indicate –40°C to +125°C,
unless noted.
Parameter
Conditions
Min
Typ
Max
Units
Output Voltage Accuracy
At 25°C, fixed voltage options
Over temperature range
–1
–2
+1
+2
%
%
Output Voltage Line
Regulation
V
IN = VOUT + 1V to 6V
-0.1
+0.1
%/V
Output Voltage Load
Regulation
IL = 10mA to 5A
0.2
1.0
%
VIN – VO; Dropout Voltage
VBIAS – VO; Dropout Voltage
Ground Pin Current
IL = 2.5A
IL = 5.0A
145
290
300
500
mV
mV
IL = 2.5A
IL = 5.0A
1.5
1.7
2.0
2.1
V
V
VOUT = 1.2V; IL = 0mA
55
55
55
75
mA
mA
mA
mA
V
OUT = 1.2V; IL = 5.0A
90
90
130
0.7V ≤ VOUT ≤ 1.8V
1.8V < VOUT ≤ 3.3V
Ground Pin Current in
Shutdown
VIL < 0.6V
0.1
5
µA
Current thru VBIAS
IL = 0mA
IL = 5.0A
VOUT = 0V
30
70
7.5
50
50
150
9.5
mA
mA
A
Current Limit
5.5
Feedback Current
Enable Input
1000
nA
Enable Input Threshold
Regulator enable
Regulator shutdown
1.6
20
1.2
1.15
50
V
V
0.6
150
5
Enable Hysteresis
Enable Pin Input Current
Turn-on Time
mV
µA
µs
0.1
10
COUT = 10µF; Note 5
45
Reference Voltage (Adjustable Output Only)
VREF
TA = 25°C
0.693
0.7
0.707
V
V
–40°C < TA < 125°C
0.686
0.714
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, 1.5k in series with 100pF.
4. Specification for packaged product only.
5. Turn-on time is measured from 10% of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
4
M9999-071307
July 2007
Micrel, Inc.
MIC49500
Typical Characteristics
Ground Current
Output Voltage
Output Voltage
vs. Load Current
vs. Input Voltage
vs. Bias Voltage
60
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
50mA
50mA
2.5A
55
50
45
40
35
2.5A
5A
5A
V
V
V
V
= V
OUT
+ 1V
IN
OUT
= 1.2V
IN
30
25
20
V
V
= 1.5V
= 3.3V
= 10µF
= V
OUT
BIAS
V
V
= V
+ 1V
EN
IN
OUT
= 3.3V
= 1.5V
BIAS
OUT
C
OUT
C
= C = 10µF
C
= 10µF
OUT
IN
OUT
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
LOAD CURRENT (A)
0
1
2
3
4
5
0
1
2
3
4
5
INPUT VOLTAGE (V)
BIAS VOLTAGE (V)
Bias Current
vs. Output Current
Ground Current
vs. Temperature
Output Voltage
vs. Temperature
80
60
50
40
30
20
10
0
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
2.5A
5A
70
60
50
40
30
20
10
0
1A
100µA
0
500mA
V
V
V
= V
+ 1V
IN
OUT
= 1.8V
= 3.3V
= C
V
V
= V
+ 1V
V
V
= V = 1V
OUT
OUT
BIAS
OUT
IN
OUT
OUT
= 3V
IN
= 1.5V
= 10µF
OUT
OUT
C
= 10µF
4 5
C
OUT
= 10µF
C
BIAS
20 40 60 80
20 40 60 80
0
1
2
3
TEMPERATURE (°C)
OUTPUT CURRENT (A)
TEMPERATURE (°C)
Bias Current
vs. Temperature
Output Voltage
vs. Temperature
Dropout Voltage
vs. Output Current
60
50
40
30
20
10
0
800
780
760
740
720
700
680
660
640
620
600
350
300
250
200
150
100
50
1A
2.5A
5A
0
100µA
500mA
V
V
V
= V
+ 1V
OUT
IN
= 1.5V
= 3.3V
= 10µF
V
V
V
= V
+ 1V
OUT
OUT
BIAS
OUT
IN
= 1.5V
= 3.3V
= 10µF
V
= 4V
OUT
OUT
BIAS
OUT
IN
C
I
V
= 3V
= 100µA
C
= 10µF
C
OUT
OUT
0
20 40 60 80
TEMPERATURE (°C)
20 40 60 80
TEMPERATURE (°C)
0
1
2
3
4
5
OUTPUT CURRENT (I)
V
Dropout Voltage
Enable Threshold
Current Limit
BIAS
vs. Output Current
vs. Input Voltage
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
10
9
8
7
6
5
4
3
2
1
0
2.5
2.0
1.5
1.0
0.5
0
Room
Cold
Hot
V
V
V
= 2.5V
= 0V
V
V
V
= V
+ 1V
OUT
IN
OUT
BIAS
IN
= 1.5V
= 3.3V
= 10µF
OUT
BIAS
OUT
= 3.3V
= 10µF
C
C
OUT
0
1
2
3
4
5
2.5
3
3.5
4
4.5
5
5.5
0
0.5
1
1.5
2
2.5
3
OUTPUT CURRENT (A)
INPUT VOLTAGE (V)
ENABLE VOLTAGE (V)
5
M9999-071307
July 2007
Micrel, Inc.
MIC49500
Typical Characteristics (continued)
Output Noise
Spectral Density
MIC49500 VBIAS PSRR
MIC49500 VIN PSRR
10
1
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
0.1
0.01
V
V
= 3.8V
IN
OUT
C
= 2.8V
= 10µF
= 10mA
OUT
OUT
I
0.01 0.1
1
10 100 1,000 10,000
10
100
1k
10k 100k 1M
10
100
1k
10k 100k 1M
FREQUENCY (kHz)
FREQUENCY (Hz)
FREQUENCY (Hz)
6
M9999-071307
July 2007
Micrel, Inc.
MIC49500
Functional Characteristics
Enable Turn-On
Load Transient
V
= 1.8V
OUT
= 2.8V
V
IN
V
C
= 3.9V
BIAS
= C
= 10µF
OUT
BIAS
5A
V
V
= 1.8V
OUT
= V
= 5V
IN
BIAS
= 10mA
I
OUT
0A
C
C
= C
= 10µF
BIAS
OUT
FEEDFORWARD
= 47pF
Time (2µs/div)
Time (10µs/div)
Line Transient (V )
Line Transient (V
)
IN
BIAS
5V
5V
4V
4V
V
V
= 1.5V
OUT
= 2.5V
V
V
= 1.5V
= 3.6V
= 10µF
= 1A
OUT
IN
BIAS
C
= 10µF
= 1A
OUT
C
OUT
I
OUT
I
OUT
Time (100µs/div)
Time (100µs/div)
7
M9999-071307
July 2007
Micrel, Inc.
MIC49500
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.
Applications Information
The MIC49500 is an ultra-high performance, low
dropout linear regulator designed for high current
applications requiring fast transient response. The
MIC49500 utilizes two input supplies, significantly
reducing dropout voltage, perfect for low-voltage, DC-
to-DC conversion. The MIC49500 requires a minimum
of external components and obtains a bandwidth of up
to 10MHz. As a µCap regulator, the output is tolerant
of virtually any type of capacitor including ceramic and
tantalum.
The MIC49500 regulator is fully protected from
damage due to fault conditions, offering constant
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" 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 MIC49500. VBIAS requires
approximately 70mA for 5A load current. 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 290mV
at a 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 3.0V.
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 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 1.4V,
allowing conversion from low voltage supplies.
PD = VIN × IIN + VBIAS × IBIAS – VOUT × IOUT
The input current will be less than the output current
as the output 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 MIC49500 requires
a minimum of output
capacitance to maintain stability. However, proper
capacitor selection is important to ensure desired
transient response. The MIC49500 is specifically
designed to be stable with a wide range of
capacitance values and ESR. A 10µF ceramic chip
capacitor should satisfy most applications. Output
capacitance can be increased without bound. See
typical characteristics for examples of load transient
response.
T
J(MAX) ± TA
⎛
=
SA
P
)
CS
⎝
D
JC
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
X7R dielectric ceramic capacitors are recommended
because of their temperature performance. X7R-type
8
M9999-071307
July 2007
Micrel, Inc.
MIC49500
regulator. The low dropout properties of the MIC49500
allow significant reductions in regulator power
dissipation and the associated heat sink without
compromising 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 for further details and examples
on thermal design and heat sink specification.
Adjustable Regulator Design
The MIC49500 adjustable
programming the output voltage anywhere between
0.7Vand 6V. 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:
version
allows
V
OUT
– 1
R1 = R2 ×
Minimum Load Current
0.7
The MIC49500, unlike most other high current
regulators, does not require a minimum load to
maintain output voltage regulation.
Where VOUT is the desired output voltage.
Enable
The fixed output voltage versions of the MIC49500
feature an active high enable input (EN) that 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
TTL/CMOS compatible thresholds for simple logic
interfacing. EN may be directly tied to VIN and pulled
up to the maximum supply voltage.
Power Sequencing
There is no power sequencing requirement for VIN and
V
BIAS, giving more flexibility to the user.
9
M9999-071307
July 2007
Micrel, Inc.
MIC49500
Package Information
7-Pin SPAK (R)
7-Pin TO-263 (U)
10
M9999-071307
July 2007
Micrel, Inc.
MIC49500
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.
11
M9999-071307
July 2007
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