MIC49500
5A Dual Supply, Low Voltage,
High Bandwidth LDO
General Description
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.
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.
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.
Features
•
Input voltage range:
– V
IN
: 1.4V to 6V
– V
BIAS
: 3.0V to 6V
•
Stable with 10µF ceramic output capacitor
•
+1.0% initial output tolerance
•
Maximum dropout (V
IN
– V
OUT
) is 500mV over
temperature
•
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
Applications
•
•
•
•
ASIC Core Voltage Regulator
PLD/FPGA Core Power Supply
Linear Point-of-Load Conversion
High Speed Post-Regulator
Typical Application
V
IN
= 2.0V
OFF
ON
MIC49500WR
IN
EN
BIAS
GND
ADJ
OUT
V
OUT
= 1.0V
R1
C
OUT
= 10µF
Ceramic
Output Voltage
(50mV/div)
Load Transient
V
BIAS
= 3.1V
C
BIAS
= 1µF
Ceramic
C
IN
= 1µF
Ceramic
V
OUT
= 1.8V
V
IN
= 2.8V
V
BIAS
= 3.9V
5A
C
OUT
= C
BIAS
= 10µF
R2
Output Current
(2A/div)
0A
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
July 2007
M9999-071307
Micrel, Inc.
MIC49500
Block Diagram
VBIAS
VIN
Ilimit
EN
Enable
Bandgap
ADJ
SNS / ADJ
FIX (SNS)
VOUT
ADJ
FIX
GND
July 2007
2
M9999-071307
Micrel, Inc.
MIC49500
Ordering Information
Part Number*
MIC49500-0.9WR
MIC49500-1.2WR
MIC49500WR
MIC49500-0.9WU
MIC49500-1.2WU
MIC49500WU
Voltage
0.9V
1.2V
ADJ
0.9V
1.2V
ADJ
Junction Temperature Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
S-Pak-7
S-Pak-7
S-Pak-7
TO-263
TO-263
TO-263
Lead Finish*
RoHS Compliant
RoHS Compliant
RoHS Compliant
RoHS Compliant
RoHS Compliant
RoHS Compliant
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
1
2
3
4
5
6
7
7
Pin Name
(Fixed)
EN
VBIAS
VIN
GND
VOUT
NC
VSNS
-
Pin Name
(Adj)
EN
VBIAS
VIN
GND
VOUT
-
ADJ
Pin Function
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.
Ground (TAB is connected to Ground).
Output Voltage: Regulator Output.
No Connect
Remote Voltage Sense: Connect direct the load to improve
regulation. Connect direct to pin 5 if not used.
Adjust Input. Connect external resistor divider to program output
voltage.
July 2007
3
M9999-071307
Micrel, Inc.
MIC49500
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................. 6.5V
Bias Supply Voltage (V
BIAS
) .................................. 6.5V
Enable Input Voltage (V
EN
)................................... 6.5V
Power Dissipation............................. Internally Limited
Junction Temperature ................. -40°C
≤
T
J
≤
+125°C
Storage Temperature (TS) ........... -65°C
≤
TJ
≤
150°C
Lead Temperature (soldering, 5 sec.) ................260°C
ESD Rating
(3)
.........................................................3kV
Operating Ratings
(2)
Supply voltage (V
IN
).......................................1.4V to 6V
Bias Supply Voltage (V
BIAS
)..............................3V to 6V
Enable Input Voltage (V
EN
)........................... 0V to V
BIAS
Junction Temperature Range........-40°C
≤
T
J
≤
+125°C
Package Thermal Resistance
S-Pak (θ
JC
) ................................................. 2°C/W
TO-263 (θ
JC
) ............................................... 2°C/W
Electrical Characteristics
(4)
V
IN
= V
OUT
+ 1.0V; V
BIAS
= V
OUT
+ 2.1V; C
OUT
= 10µF; I
OUT
= 10mA; T
J
= 25°C,
bold
values indicate –40°C to +125°C,
unless noted.
Parameter
Output Voltage Accuracy
Output Voltage Line
Regulation
Output Voltage Load
Regulation
V
IN
– V
O
; Dropout Voltage
V
BIAS
– V
O
; Dropout Voltage
Ground Pin Current
Conditions
At 25°C, fixed voltage options
Over temperature range
V
IN
= V
OUT
+ 1V to 6V
I
L
= 10mA to 5A
I
L
= 2.5A
I
L
= 5.0A
I
L
= 2.5A
I
L
= 5.0A
V
OUT
= 1.2V; I
L
= 0mA
V
OUT
= 1.2V; I
L
= 5.0A
0.7V
≤
V
OUT
≤
1.8V
1.8V < V
OUT
≤
3.3V
V
IL
< 0.6V
I
L
= 0mA
I
L
= 5.0A
V
OUT
= 0V
Min
–1
–2
-0.1
Typ
Max
+1
+2
+0.1
Units
%
%
%/V
%
mV
mV
V
V
mA
mA
mA
mA
µA
mA
mA
A
nA
V
V
mV
µA
µs
V
V
0.2
145
290
1.5
1.7
55
55
55
75
0.1
30
70
7.5
50
1.2
1.15
50
0.1
10
0.7
1.0
300
500
2.0
2.1
90
90
130
5
50
150
9.5
1000
Ground Pin Current in
Shutdown
Current thru V
BIAS
Current Limit
Feedback Current
Enable Input
Enable Input Threshold
5.5
Regulator enable
Regulator shutdown
1.6
20
Enable Hysteresis
Enable Pin Input Current
C
OUT
= 10µF;
Note 5
Turn-on Time
Reference Voltage (Adjustable Output Only)
V
REF
T
A
= 25°C
–40°C < T
A
< 125°C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
0.6
150
5
45
0.707
0.714
0.693
0.686
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.
July 2007
4
M9999-071307
Micrel, Inc.
MIC49500
Typical Characteristics
60
55
50
45
40
35
30
25
V
IN
= V
OUT
+ 1V
V
OUT
= 1.2V
V
EN
= V
IN
V
BIAS
= 3.3V
C
OUT
= 10µF
Ground Current
vs. Load Current
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
Output Voltage
vs. Input Voltage
50mA
2.5A
1.6
1.4
1.2
1.0
0.8
0.6
Output Voltage
vs. Bias Voltage
50mA
2.5A
5A
5A
20
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
LOAD CURRENT (A)
V
OUT
= 1.5V
V
BIAS
= 3.3V
C
OUT
= 10µF
1
2
3
4
INPUT VOLTAGE (V)
5
0.4
0.2
0
0
1
V
IN
= V
OUT
+ 1V
V
OUT
= 1.5V
C
OUT
= C
IN
= 10µF
2
3
4
BIAS VOLTAGE (V)
5
80
70
60
50
40
30
20
10
0
0
Bias Current
vs. Output Current
60
50
40
Ground Current
vs. Temperature
2.5A
1A
100µA
5A
1.70
1.65
1.60
1.55
Output Voltage
vs. Temperature
30 500mA
V
IN
= V
OUT
+ 1V
V
OUT
= 1.8V
V
BIAS
= 3.3V
C
OUT
= C
BIAS
= 10µF
1
2
3
4
OUTPUT CURRENT (A)
5
20
10
0
0
1.50
1.45
V
IN
= V
OUT
+ 1V
V
OUT
= 3V
C
OUT
= 10µF
20 40 60 80
TEMPERATURE (°C)
1.40
1.35
1.30
V
IN
= V
OUT
= 1V
V
OUT
= 1.5V
C
OUT
= 10µF
20 40 60 80
TEMPERATURE (°C)
60
50
40
30
20
10
0
0
Bias Current
vs. Temperature
800
780
760
740
Output Voltage
vs. Temperature
350
300
250
200
150
Dropout Voltage
vs. Output Current
1A
2.5A
100µA
500mA
V
IN
= 4V
V
OUT
= 3V
C
OUT
= 10µF
20 40 60 80
TEMPERATURE (°C)
5A
720
700
680
660
640
620
600
V
IN
= V
OUT
+ 1V
V
OUT
= 1.5V
V
BIAS
= 3.3V
C
OUT
= 10µF
I
OUT
= 100µA
20 40 60 80
TEMPERATURE (°C)
100
50
0
0
V
IN
= V
OUT
+ 1V
V
OUT
= 1.5V
V
BIAS
= 3.3V
C
OUT
= 10µF
1
2
3
4
OUTPUT CURRENT (I)
5
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
V
BIAS
Dropout Voltage
vs. Output Current
Enable Threshold
2.5
2.0
1.5
1.0
Hot
10
9
8
7
6
5
4
3
2
1
0
2.5
Current Limit
vs. Input Voltage
Room
Cold
V
IN
= V
OUT
+ 1V
V
OUT
= 1.5V
V
BIAS
= 3.3V
C
OUT
= 10µF
1
2
3
4
OUTPUT CURRENT (A)
5
0.5
0
0
V
IN
= 2.5V
V
OUT
= 0V
V
BIAS
= 3.3V
C
OUT
= 10µF
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
0.5
1
1.5
2
2.5
ENABLE VOLTAGE (V)
3
July 2007
5
M9999-071307
微控制器 MCU
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