MIC47100
1A High Speed Low VIN LDO
General Description
The MIC47100 is a high speed, Low V
IN
LDO capable of
delivering up to 1A and designed to take advantage of
point of load applications that use multiple supply rails to
generate a low voltage, high current power supply. The
MIC47100 is stable with only a 1µF ceramic output
capacitor and is available in a thermally enhanced
2mm × 2mm MLF
®
package thus making it an optimal
solution for board-constrained applications.
The MIC47100 has an NMOS output stage offering very
low output impedance. The NMOS output stage offers a
unique ability to respond very quickly to sudden load
changes such as that required by a microprocessor, DSP
or FPGA. The MIC47100 consumes little quiescent
current and therefore can be used for driving the core
voltages of mobile processors, post regulating a core
DC/DC converter in any portable device.
The MIC47100 is available in fixed and adjustable output
voltages in the exposed pad MSOP-8 package and the tiny
2mm × 2mm MLF
®
package with 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
•
Operating voltage range:
-
Input Supply: 1.0V to 3.6V
-
Bias Supply: 2.3V to 5.5V
•
0.8V to 2.0V output voltage range
•
High bandwidth – very fast transient response
•
PSRR >50dB at 100kHz
•
Stable with a 1µF ceramic output capacitor
•
Low dropout voltage of 80mV at 1A
•
High output voltage accuracy:
-
+/- 1.5% initial accuracy
-
+/- 2% over temperature
•
Logic level enable input
•
UVLO on both supply voltages for easy turn-on
•
ePad MSOP-8 – small form factor power package
•
Thermally enhanced 2mm × 2mm MLF
®
– smallest
solution
Applications:
•
•
•
•
Point of Load
PDAs
DSP, PLD and FPGA Power Supply
Low Voltage Post Regulation
___________________________________________________________________________________________________________
Typical Application
MicroLead Frame and MLF are registered trademark of Amkor Technology
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2008
M9999-092908-B
Micrel, Inc.
MIC47100
Ordering Information
Part Number
MIC47100YML
MIC47100-0.8YML
MIC47100-1.0YML
MIC47100-1.2YML
MIC47100YMME
MIC47100-08YMME
MIC47100-10YMME
MIC47100-12YMME
Note:
1. Other Voltage available. Contact Micrel for details.
2. MLF is a Green RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen free
®
Marking Code
EAA
E08
E10
E12
ZEAAY
ZE08Y
ZE10Y
ZE12Y
Nominal Output
Voltage
(1)
ADJ
0.8V
1.0V
1.2V
ADJ
0.8V
1.0V
1.2V
Package
8-Pin 2mm × 2mm MLF
®(2)
8-Pin 2mm × 2mm MLF
®(2)
Lead Finish
Pb free
Pb free
Pb free
Pb free
Pb free
Pb free
Pb free
Pb free
8-Pin 2mm × 2mm MLF
®(2)
8-Pin 2mm × 2mm MLF
®(2)
8-pin e-MSOP
8-pin e-MSOP
8-pin e-MSOP
8-pin e-MSOP
September 2008
2
M9999-092908-B
Micrel, Inc.
MIC47100
Pin Configuration
8-pin 2mm x 2mm MLF
®
Fixed and Adjustable (ML)
8-pin Exposed Pad MSOP
Fixed and Adjustable (MME)
Pin Description
Pin Number
MLF
1,2
3
4
5
6 (Fixed)
6 (Adj)
7,8
Pin Number
MSOP
1,2
3
4
5
6 (Fixed)
6 (Adj)
7,8
IN
GND
BIAS
EN
FB
ADJ
OUT
Input Supply. Drain of NMOS pass transistor which is the
power input voltage for regulator. The NMOS pass transistor
steps down this input voltage to create the output voltage.
Ground. Ground pins and exposed pad must be connected
externally.
Bias Supply. The bias supply is the power supply for the
internal circuitry of the regulator.
Enable: TTL/CMOS compatible input. Logic high = enable,
logic low or open = shutdown
Feedback Input. Connect to OUT. Optimum load regulation is
obtained when feedback is taken from the actual load point.
Adjust Input. Connect external resistor divider to program
output voltage.
Output. Output Voltage of Regulator
Pin Name
Pin Name
September 2008
3
M9999-092908-B
Micrel, Inc.
MIC47100
Absolute Maximum Ratings
(1)
Input Supply Voltage (V
IN
).................................... 0V to +4V
Bias Supply Voltage (V
BIAS
).................................. 0V to +6V
Enable Voltage (V
EN
)............................................ 0V to +6V
Power Dissipation, Internally Limited
(3)
Lead Temperature (soldering, #sec.)......................... 260°C
Storage Temperature (T
s
) ..........................-65°C to +150°C
ESD Rating
(4)
................................................................. 2kV
Operating Ratings
(2)
Input Supply Voltage (V
IN
).............................. 1.0V to +3.6V
Bias Supply Voltage (V
BIAS
)............................ 2.3V to +5.5V
Enable Input Voltage (V
EN
).................................. 0V to V
BIAS
Junction Temperature (T
J
) ........................ –40°C to +125°C
Junction Thermal Resistance
ePad MSOP-8 (θ
JA
) ...........................................64°C/W
2mm x 2mm MLF
®
(θ
JA
).....................................90°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+0.5V; V
BIAS
= V
OUT
+ 2.1V, I
OUT
= 100µA; T
A
= 25°C, bold values indicate –40°C< T
A
< +125°C, unless noted.
Parameter
Condition
Min
Typ
Max
Units
UVLO Thresholds
(6)
UVLO Hysteresis
Output Voltage
Accuracy
Output Voltage Line
Regulation (Bias
Supply)
Output Voltage Line
Regulation
(Input Supply)
Load Regulation
Input Supply Dropout
Voltage
Bias Supply Dropout
Voltage
Ground current from
V
BIAS
Shutdown current
from V
BIAS
Ground current from
V
IN
Shutdown current
from V
IN
Ripple Rejection
Bias Supply
Input Supply
V
BIAS
V
IN
Variation from nominal V
OUT
Variation from nominal V
OUT
; -40°C to +125°C
V
BIAS
= V
OUT
+ 2.1V to 5.5V
1.9
0.7
2.1
0.85
70
25
2.3
1.0
V
mV
-1.5
-2.0
-0.1
0.015
+1.5
+2.0
0.1
%
%
%/V
V
IN
= V
OUT
+ 0.5V to 3.6V
-0.05
0.005
0.05
%/V
I
OUT
= 10mA to 1A
I
OUT
= 100mA;
I
OUT
= 500mA;
I
OUT
= 1A;
I
OUT
= 100mA;
I
OUT
= 500mA;
I
OUT
= 1A
I
OUT
= 1mA
I
OUT
= 1A
EN < 0.2V
I
OUT
= 1A
EN < 0.2V
f = 1kHz; C
OUT
= 1.0µF; I
OUT
= 100mA
f = 100kHz; C
OUT
= 1.0µF; I
OUT
= 100mA
f = 500kHz; C
OUT
= 1.0µF; I
OUT
= 100mA
4
0.2
8.5
37
80
1.15
1.25
1.35
350
350
0.1
6
0.1
80
55
45
0.5
50
250
%
mV
mV
mV
V
V
V
µA
µA
µA
µA
2.1
500
500
1.0
1.0
µA
dB
dB
dB
September 2008
M9999-092908-B
Micrel, Inc.
Parameter
Condition
Min
Typ
Max
MIC47100
Units
Current Limit
Output Voltage Noise
Over-temperature
Shutdown
Over-temperature
Shutdown Hysteresis
Enable Inputs
V
IN
= 2.7V; V
OUT
= 0V
C
OUT
=1μF; 10Hz to 100kHz; I
OUT
= 100mA
1.1
1.6
63
160
20
2.5
A
µV
RMS
°C
°C
Enable Voltage
Enable Input Current
Turn-on Time
Reference Voltage
ADJ pin Input current
Notes:
Logic Low
Logic High
VIL < 0.2V
VIH = 1.2V
C
OUT
= 1µF; 90% of typical V
OUT
0.69
0.686
1.0
1
6
35
0.7
20
0.2
V
V
µA
µA
µs
V
V
nA
500
0.71
0.714
Reference Voltage (Adjustable Option Only)
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(max)
= T
J(max)
– T
A
) /
θ
JA
. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
5. Specification for packaged product only.
6. Both UVLO thresholds must be met for the output voltage to be allowed to turn-on. If either of the two input voltages are below the UVLO thresholds,
the output is kept off.
September 2008
5
M9999-092908-B
实时操作系统RTOS
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