MIC47053
500mA Micropower ULDO™
Linear Regulator
General Description
The MIC47053 is a high-speed, adjustable output ultra-low
dropout, dual NMOS ULDO™ designed to power point-of-
load applications that require a low-voltage, high-current
power supply. The MIC47053 can source 500mA of output
current while only requiring a 1
µ
F ceramic output capacitor
for stability. The MIC47053 offers 2% output voltage
accuracy over temperature, low dropout voltage (49mV @
500mA), and low ground current which makes this device
ideally suited for mobile and point-of-load applications.
The MIC47053 has an NMOS output stage offering very
low output impedance. The NMOS output stage makes for
a unique ability to respond very quickly to sudden load
changes such as that required by a microprocessor, DSP
or FPGA. The MIC47053 consumes little quiescent current
and therefore can be used for driving the core voltages of
mobile processors and post regulating a core DC/DC
converter in any processor.
The MIC47053 is available in the tiny 2mm x 2mm Thin
DFN packages with an operating junction temperature
range of
40C
to
125C.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
Wide input voltage range
– Input voltage: 1.0V to 3.6V
– Bias voltage: 2.3V to 5.5V
Adjustable output voltage range down to 0.4V
Low dropout voltage of 49mV at 500mA
Low shutdown current: 0.1µA typical
±2% initial output voltage accuracy over temperature
High bandwidth – very fast transient response
Stable with a 1µF ceramic output capacitor
Logic level enable input
UVLO on both supply voltages
Available in thermally-enhanced 2mm x 2mm Thin DFN
package
Junction temperature range of –40C to +125C
Applications
Point-of-load applications
PDAs, Notebooks, and Desktops
DSP, PLD, and FPGA power supply
Low-voltage post regulation
_________________________________________________________________________________________________________________________
Typical Application
ULDO is a trademark of Micrel 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
August 2012
M9999-080712-C
Micrel, Inc.
MIC47053
Ordering Information
Part Number
MIC47053YMT
Notes:
1.
2.
3.
Over bar symbol (
¯
) may not be to scale.
Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Thin DFN package Pin 1 identifier =
▲.
Marking Code
(1)
Z53
Output Voltage
ADJ
Package
(2,3)
8 pin 2mm x 2mm Thin DFN
Lead Finish
Pb-Free
Pin Configuration
8-Pin 2mm x 2mm Thin DFN (MT)
Top View
Pin Description
Pin Number
1
2
3, 4
5
6
7
Pin Name
BIAS
GND
IN
OUT
ADJ
PGOOD
Pin Function
Bias Supply. The bias supply is the power supply for the internal circuitry of the regulator.
Ground. Ground pins and exposed pad must be connected externally.
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.
Output. Output Voltage of Regulator.
Adjust Input. Connect external resistor divider to program the output voltage.
Power Good Output. Open-drain output. Output is driven low when the output voltage is less than the
power good threshold of its programmed nominal output voltage. When the output goes above the
power good threshold, the open-drain output goes high-impedance, allowing it to be pulled up to a
fixed voltage.
Enable: TTL/CMOS compatible input. Logic high = enable, logic low = shutdown.
Exposed thermal pad. Connect to the ground plane to maximize thermal performance.
8
EP
EN
ePad
August 2012
2
M9999-080712-B
Micrel, Inc.
MIC47053
Absolute Maximum Ratings
(1)
Bias Supply Voltage (V
BIAS
)............................. –0.3V to +6V
IN Supply Voltage (V
IN
) ................................... –0.3V to +4V
OUT Pin Voltage (V
OUT
) ................................... .–0.3V to V
IN
ADJ Pin Voltage (V
ADJ
)................................... .–0.3V to +6V
Power Good (PGOOD) Voltage (V
PGOOD
)....... .–0.3V to +6V
Enable Voltage (V
EN
)....................................... –0.3V to +6V
Lead Temperature (soldering, 10s)............................ 260C
Storage Temperature (T
S
).........................–65C to +150C
ESD Rating
(3)
................................................. ESD Sensitive
Power Dissipation
(4)
………………………..Internally Limited
Operating Ratings
(2)
IN Supply Voltage (V
IN
) ............ +1.0V to +3.6V (V
IN
< V
BIAS
)
Bias Voltage (V
BIAS
)...................................... +2.3V to +5.5V
Enable Voltage (V
EN
)........................................... 0V to V
BIAS
Power Good Voltage (V
PGOOD
) ........................... .0V to V
BIAS
Output Voltage Range …………….. ................ 0.4V to 3.4V
Junction Temperature (T
J
) ........................ –40°C to +125°C
Ambient Temperature (T
A
) ........................ –40°C to +125°C
Junction Thermal Resistance
2mm x 2mm Thin DFN-8L (
JA
) .........................90°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 0.5V; V
BIAS
= V
OUT
+2.1V; C
OUT
=1µF; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Input Supply
Input Voltage Range (V
IN
)
V
IN
UVLO Threshold
(6)
V
IN
UVLO Hysteresis
Ground Current in Shutdown (I
GND
)
Ground Current (I
GND
)
Bias Supply
BIAS Input Voltage (V
BIAS
)
V
BIAS
UVLO Threshold
(6)
V
BIAS
UVLO Hysteresis
Dropout Voltage (V
BIAS
- V
OUT
)
V
BIAS
Supply Current (I
BIAS
)
V
BIAS
Supply Current in Shutdown (I
BIAS
)
Output Voltage
Dropout Voltage (V
IN
- V
OUT
)
Output Voltage Accuracy
V
BIAS
Line Regulation
I
OUT
= 100mA
I
OUT
= 500mA
I
OUT
= 100µA
V
BIAS
= V
OUT
+ 2.1V to 5.5V
2.0
0.1
12
49
50
120
+2.0
0.1
mV
%
%/V
I
OUT
= 100mA
I
OUT
= 500mA
I
OUT
= 500mA; V
BIAS
= V
OUT
+ 2.1V
V
EN
= 0V (Regulator Shutdown)
V
BIAS
Rising
2.3
1.7
2.0
70
1.3
1.4
330
0.1
2.1
500
1.0
5.5
2.3
V
V
mV
V
A
A
V
EN
= 0V (Regulator Shutdown)
I
OUT
= 500mA; V
IN
= V
OUT
+ 0.5V
V
IN
Rising
1.0
0.7
0.81
25
0.1
6
1.0
15
3.6
1.0
V
V
mV
A
A
Condition
Min.
Typ.
Max.
Units
August 2012
3
M9999-080712-B
Micrel, Inc.
MIC47053
Electrical Characteristics
(5)
(Continued)
V
IN
=V
OUT
+ 0.5V; V
BIAS
=V
OUT
+ 2.1V; C
OUT
=1µF; I
OUT
=100µA; T
J
=25°C,
bold
values indicate -40°C
≤
T
J
≤
125°C, unless noted.
Parameter
V
IN
Line Regulation
Load Regulation
Current Limit
Short-Circuit Current Limit
Enable Input
EN Logic Level High
EN Logic Level Low
Enable Bias Current
Turn-On Time
Thermal Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Hysteresis
Power Good (PGOOD)
PGOOD Threshold Voltage
PGOOD Hysteresis
PGOOD Output Low Voltage
PGOOD Leakage Current
Reference Voltage
Feedback Reference Voltage
FB Bias Current
Output Voltage Noise and Ripple Rejection
Output Voltage Noise
Ripple Rejection
Notes:
1.
2.
3.
4.
5.
6.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(MAX)
= (T
J(MAX)
T
A
) /
θ
JA
.
Specification for packaged product only.
Both V
IN
and V
BIAS
UVLO thresholds must be met for the output voltage to turn-on. If either of the two input voltages is below the UVLO thresholds,
the output is disabled.
Condition
V
IN
= V
OUT
+ 0.5V to 3.6V
I
OUT
= 10mA to 500mA
V
IN
= 2.7V; V
OUT
= 0V
Min.
0.05
0.5
0.6
1.0
Typ.
Max.
0.05
Units
%/V
%
A
V
0.2
1.6
0.5
2.5
0.2
V
EN
= 0V (Regulator Shutdown)
V
EN
= 1.0V (Regulator Enabled)
C
OUT
= 1µF; 90% of typical V
OUT
T
J
Rising
0
6
25
160
20
95
2
10
500
V
A
s
C
C
V
OUT
Rising
V
OUT
Falling
85
90.5
89.5
1
%
%
I
PG
= 250A
V
PG
= 5.0V
I
OUT
= 100A
V
FB
= 0.8V
f = 10Hz to 100kHz; I
OUT
= 500mA; C
OUT
=1µF
f = 10kHz; C
OUT
= 1µF, I
OUT
= 100mA
f = 100kHz; C
OUT
= 1µF, I
OUT
= 100mA
1
0.392
0.02
0.01
0.4
20
111
47
35
0.1
+1
0.408
V
A
V
nA
V
RMS
dB
August 2012
4
M9999-080712-B
Micrel, Inc.
MIC47053
Typical Characteristics
Output Voltage vs.
Input Voltage
1.40
1.20
70
60
50
40
30
20
10
0
0
1
2
3
4
0
100
200
300
400
500
V
BIAS
= 5.0V
V
OUT
= 1.8V
Input Dropout Voltage vs.
Output Current
70
60
50
40
30
20
10
0
-40
-20
Input Droput Voltage
vs.Temperature
I
OUT
= 500mA
DROPOUT VOLTAGE (mV)
1.00
0.80
0.60
0.40
0.20
0.00
V
BIAS
= 5.0V
V
OUT
= 1.2V
I
OUT
= 500mA
DROPOUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
I
OUT
= 100mA
V
BIAS
= 3.6V
V
OUT
= 1.2V
0
20
40
60
80
100
120
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Output Voltage vs.
Bias Voltage
2.20
2.00
2.00
1.80
Bias Dropout Voltage vs.
Output Current
V
OUT
= 2.0V
1.90
1.80
Bias Dropout Voltage vs.
Temperature
V
OUT
= 2.0V
OUTPUT VOLTAGE (V)
DROPOUT VOLTAGE (V)
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
2
I
OUT
= 100mA
DROPOUT VOLTAGE (V)
1.80
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
0
100
200
300
V
IN
= 2.5V
V
OUT
= 1.2V
1.70
1.60
1.50
1.40
1.30
1.20
1.10
1.00
0.90
-40
-20
0
20
40
V
OUT
= 1.2V
V
IN
= 2.5V
I
OUT
= 500mA
60
80
100
120
I
OUT
= 500mA
V
IN
= 2.5V
V
OUT
= 1.2V
2.5
3
3.5
4
4.5
5
5.5
400
500
BIAS VOLTAGE (V)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Bias Current vs.
Bias Voltage
440
420
400
350
348
346
Bias Current vs.
Output Current
400
V
BIAS
= 3.6V
V
IN
= 1.8V
V
OUT
= 1.2V
380
Bias Current vs.
Temperature
BIAS CURRENT (µA)
BIAS CURRENT (µA)
380
360
340
320
300
280
260
240
3.0
3.5
4.0
4.5
5.0
5.5
V
IN
= 1.8V
I
OUT
= 1mA
344
342
340
338
336
334
332
330
0
100
200
300
400
500
BIAS CURRENT (µA )
360
340
320
300
280
260
240
-40
-20
0
20
40
60
80
100
120
V
BIAS
= 3.6V
V
IN
= 1.8V
V
OUT
= 1.2V
BIAS VOLTAGE (V)
OUTPUT CURRENT (mA)
TEMPERATURE (
°C
)
August 2012
5
M9999-080712-B
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