MIC5191
Ultra High-Speed, High-Current
Active Filter / LDO Controller
General Description
The MIC5191 is an ultra high-speed linear regulator. It
uses an external N-Channel FET as its power device.
The MIC5191's ultra high-speed abilities can handle the
fast load demands of microprocessor cores, ASICs, and
other high-speed devices. Signal bandwidths of greater
than 500 kHz can be achieved with a minimum amount of
capacitance while at the same time keeping the output
voltage clean, regardless of load demand. A powerful
output driver delivers large MOSFETs into their linear
regions, achieving ultra-low dropout voltage.
1.25V
IN
±10% can be turned into 1V ±1% without the use
of a large amount of capacitance.
MIC5191 (1.0V reference) is optimized for output voltages
of 1.0V and higher.
The MIC5191 is offered in 10-pin 3mm×3mm MLF
®
and
10-pin MSOP-10 packages and has an operating junction
temperature range of –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: V
IN
= 1.0V to 5.5V
+1.0% initial output tolerance
Dropout down to 25mV@10A
Filters out switching frequency noise on input
Very high large signal bandwidth >500kHz
PSRR >40dB at 500kHz
Adjustable output voltage down to 1.0V
Stable with any output capacitor
Excellent line and load regulation specifications
Logic controlled shutdown
Current limit protection
10-pin MLF
®
and MSOP-10 packages
Available –40°C to +125°C junction temperature
Applications
•
Distributed power supplies
•
ASIC power supplies
•
DSP, µP, and µC power supplies
___________________________________________________________________________________________________________
Typical Application
V
CC
= 12V
C1
0.01µF
V
IN
1.2V
MIC5191
IS
VIN
VCC1
VCC2
EN
C3
0.01µF
R3
COMP
FB
PGND
SGND
C2
10µF
OUT
V
OUT
1.0V@7A
IR3716S
GND
GND
PowerPAK is a trademark of Siliconix, 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
December 2006
1
M9999-122206
Micrel, Inc.
MIC5191
Ordering Information
Part Number
Standard
MIC5191BML
MIC5191BMM
Pb-Free
MIC5191YML
MIC5191YMM
Voltage
Adj.
Adj.
Junction
Temperature Range
–40° to +125°C
–40° to +125°C
Package
10-Pin 3mm x 3mm MLF
®
10-Pin MSOP
Pin Configuration
VIN
FB
SGND
VCC1
COMP
1
2
3
4
5
10 IS
9
8
7
6
PGND
OUT
VCC2
EN
VIN 1
FB 2
SGND 3
VCC1 4
COMP 5
10 IS
9 PGND
8 OUT
7 VCC2
6 EN
10-Pin 3mm x 3mm MLF
®
(ML)
Top View
10-Pin MSOP (MM)
Top View
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
Pin Name
VIN
FB
SGND
VCC1
COMP
EN
VCC2
OUT
PGND
IS
Pin Function
Input voltage (current sense +).
Feedback input to error amplifier.
Signal ground.
Supply to the internal voltage regulator.
Error amplifier output for external compensation.
Enable (Input): CMOS-compatible.
Logic high = Enable, Logic low = Shutdown. Do not float pin.
Power to output driver.
Output drive to gate of power MOSFET.
Power ground
Current sense.
December 2006
2
M9999-122206
Micrel, Inc.
MIC5191
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ....................................................+6.0V
Enable Voltage (V
EN
)....................................................+14V
V
CC
1, V
CC
2....................................................................+14V
Junction Temperature (T
J
) ..................–40°C
≤
T
J
≤
+125°C
ESD Rating
(3)
Operating Ratings
(2)
Supply Voltage (V
IN
)..................................... +1.0V to +5.5V
Enable Voltage (V
EN
)............................................. 0V to V
CC
V
CC
1, V
CC
2.................................................. +4.5V to +13.2V
Junction Temperature (T
J
) ..................–40°C
≤
T
J
≤
+125°C
Package Thermal Resistance
3x3 MLF-10 (θ
JA
)
(4)
.............................................60°C/W
MSOP-10 (θ
JA
)
(5)
..............................................200°C/W
Electrical Characteristics
(6)
T
A
= 25°C with V
IN
= 1.2V; V
CC
= 12V; V
OUT
= 1.0V;
bold
values indicate –40°C< T
J
< +125°C, unless noted.
Parameter
Output Voltage Accuracy
Output Voltage Line Regulation
Feedback Voltage
Output Voltage Load Regulation
VCC Pin Current (V
CC
1 + V
CC
2)
VCC Pin Current (V
CC
sig + V
CC
drv)
VIN Pin Current
FB Bias Current
Current Limit Threshold
Start-up Time
Enable Input Threshold
Enable Hysteresis
Enable Pin Input Current
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. Per JESD 51-5 (1S2P Direct Attach Method).
5. Per JESD 51-3 (1S0P).
6. Specification for packaged product only.
Condition
At 25°C
Over temperature range
V
IN
= 1.2V to 5.5V
I
L
= 10mA to 1A
Enable = 0V
Enable = 5V
Current from V
IN
Min
–1
–2
–0.1
0.99
Typ
Max
+1
+2
Units
%
%
%/V
V
%
µA
mA
µA
µA
mV
µs
V
V
mV
nA
nA
0.005
1
0.02
40
15
10
13
+0.1
1.01
0.5
20
15
30
70
100
0.2
35
V
EN
= V
IN
Regulator enable
Regulator shutdown
V
IL
< 0.2V (Regulator shutdown)
V
IH
> 0.8V (Regulator enabled)
0.8
50
25
0.6
0.5
100
100
100
December 2006
3
M9999-122206
嵌入式系统
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