MIC23201
2MHz PWM 2A Buck Regulator with
Hyper Speed Control™
General Description
The MIC23201 is a high efficiency 2MHz 2A synchronous
buck regulator with Hyper Speed Control. Micrel’s Hyper
Speed Control provides ultra-fast transient response which
is perfectly suited for supplying processor core voltages.
An additional benefit of this proprietary architecture is very
low output ripple voltage throughout the entire load range
with the use of small output capacitors. The tiny 3mm x
3mm MLF
®
package saves precious board space and
requires only three external components.
The MIC23201 is designed for use with a very small
inductor, down to 1µH, and an output capacitor as small as
22µF that enables a total solution size, less than 1.5mm
height.
The MIC23201 provides a constant switching frequency
around 2MHz while achieving peak efficiencies up to 90%.
The MIC23201 is available in 10-pin 3mm x 3mm MLF
package with an operating junction temperature range
from –40C to +125C.
Datasheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
Input voltage: 2.7V to 5.5V
2A output current
Up to 90% peak efficiency
Programmable Soft-Start
Power Good Indicator
2MHz switching frequency
Safe for pre-biased output
Ultra fast transient response
Low voltage output ripple, 16mV at full load
Fully integrated MOSFET switches
0.01µA shutdown current
Thermal shutdown and current limit protection
Output Voltage as low as 0.95V
10-pin 3mm x 3mm MLF
–40C to +125C operating junction temperature range
Applications
Low Voltage Point of Load
Blu Ray DVD Players
Networking Equipment
Set Top Boxes
____________________________________________________________________________________________________________
Typical Application
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
0.6
1.2
1.8
2.4
3
OUTPUT CURRENT (A)
V
IN
= 3.3V
2.5V
1.8V
1.5V
1.2V
0.95V
Efficiency (V
IN
= 3.3V)
vs. Output Current
Hyper Speed Control is a trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademark 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
August 2012
M9999-082912-A
Micrel Inc.
MIC23201
Ordering Information
Part Number
MIC23201YML
Notes:
1. Other options available. Contact Micrel for details.
2.
MLF is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Marking
Code
201A
Nominal Output
Voltage
ADJ
Package
10-pin 3mm x 3mm MLF
Junction
Temp. Range
-40C to +125C
Lead
Finish
Pb-Free
Pin Configuration
10 Pin 3mm x 3mm MLF (ML)
(Top View)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
EP
Pin Name
SW
EN
SNS
FB
PG
SS
AGND
SVIN
VIN
PGND
ePad
Pin Function
Switch output: Internal power MOSFET output switches.
Enable input: Logic high enables operation of the regulator. Logic low will shut down the device. Do
not leave floating.
Sense input: Connect to V
OUT
as close to output capacitor as possible to sense output voltage.
Feedback input: The FB pin is regulated to 0.62V. Connect a resistor divider from the output to
ground to set the output voltage.
Power Good output: Open Drain output for the power good indicator. Place a resistor between this
pin and a voltage source to detect a power good condition.
Soft Start: Place a capacitor from SS pin to ground to program the soft start time. Do not leave this
pin floating. Minimum of 100pF C
SS
is required.
Analog Ground: Connect to central ground point where all high current paths meet (C
IN
, C
OUT
,
PGND) for best operation.
Signal input voltage: This pin is connected externally to the VIN pin. A 2.2µF ceramic capacitor from
the SVIN pin to AGND must be placed next to the IC.
Power supply input voltage: The VIN pin is the input supply to the internal P-Channel Power
MOSFET. A 22µF ceramic is recommended for bypassing at VIN pin.
Power Ground.
Thermal pad. It must be connected to PGND on the PCB to improve the thermal performance.
August 2012
2
M9999-082912-A
Micrel Inc.
MIC23201
Absolute Maximum Ratings
(1)
Supply Voltage (VIN, SVIN)……………………………... ..6V
Sense (V
SNS
).. ..................................................................6V
Power Good (PG)……................................................. ....6V
Output Switch Voltage ……………………………..…….6V
Enable Input Voltage (V
EN
)............................... -0.3V to VIN
Storage Temperature Range………………-65C to +150C
ESD Rating
(3)
……………………………………………….1kV
Operating Ratings
(2)
Supply Voltage (VIN) ... …………………………..2.7V to 5.5V
Enable Input Voltage (V
EN
) .. ……………………….0V to VIN
Output Voltage Range (V
SNS
) ………………….0.95V to 3.6V
Junction Temperature Range (T
J
) .... ….-40C
T
J
+125C
Thermal Resistance
3mm x 3mm MLF-10 (
JA
) .............................60.7C/W
3mm x 3mm MLF-10 (
JC
) .............................28.7C/W
Electrical Characteristics
(4)
T
A
= 25°C; VIN = V
EN
= 3.3V; L = 1.0µH; C
OUT
= 22µF unless otherwise specified.
Bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Supply Voltage Range
Under-Voltage Lockout Threshold
Under-Voltage Lockout Hysteresis
Quiescent Current
Shutdown Current
Feedback Voltage
Feedback Bias Current
Current Limit
Output Voltage Line Regulation
SNS = 0.9*V
OUTNOM
V
IN
= 3.6V to 5.5V if V
OUTNOM
< 2.5V, I
LOAD
= 20mA
V
IN
= 4.5V to 5.5V if V
OUTNOM
≥
2.5V, I
LOAD
= 20mA
20mA < I
LOAD
< 500mA, V
IN
= 3.6V if V
OUTNOM
< 2.5V
20mA < I
LOAD
< 500mA, V
IN
= 5.0V if V
OUTNOM
≥
2.5V
20mA < I
LOAD
< 1A, V
IN
= 3.6V if V
OUTNOM
< 2.5V
20mA < I
LOAD
< 1A, V
IN
= 5.0V if V
OUTNOM
≥
2.5V
I
SW
= 100mA PMOS
I
SW
= -100mA NMOS
I
OUT
= 120mA
V
FB
= 0V
V
OUT
= 90%, CSS=470pF
V
SS
= 0V
% of V
NOMINAL
85
80
300
2.7
90
7
68
I
PG
= 250µA
Turn-On
T
J
Rising
0.5
85
0.9
0.1
160
20
1.2
2
95
2.3
I
OUT
= 0mA , SNS > 1.2 * V
OUT
Nominal
V
EN
= 0V; V
IN
= 5.5V
I
LOAD
= 20mA
0.604
V
IN
Rising
Condition
Min
2.7
2.45
2.55
200
1.15
1.34
0.62
1
4.4
0.3
0.46
0.71
0.200
0.190
2
3.35
5
0.635
Typ
Max
5.5
2.65
Units
V
V
mV
mA
µA
V
µA
A
%/V
%
%
MHz
%
µs
µA
%
%
µs
Ω
V
µA
C
C
Output Voltage Load Regulation
PWM Switch ON-Resistance
Switching Frequency
Maximum Duty Cycle
Soft Start Time
Soft Start Current
Power Good Threshold (Rising)
Power Good Hysteresis
Power Good Delay
Power Good Pull Down Resistance
Enable Threshold
Enable Input Current
Over Temperature Shutdown
Over Temperature Shutdown
Hysteresis
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. Specification for packaged product only.
August 2012
3
M9999-082912-A
Micrel Inc.
MIC23201
Typical Characteristics
50
V
IN
Operating Supply Current
vs. Input Voltage
SHUTDOWN CURRENT (µA)
V
IN
Shutdown Current
vs. Input Voltage
8.0
0.640
Feedback Voltage
vs. Input Voltage
FEEDBACK VOLTAGE (V)
SUPPLY CURRENT (mA)
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
40
0.632
30
0.624
20
0.616
10
V
OUT
= 1.8V
I
OUT
= 0A
SWITCHING
0.608
V
OUT
= 1.8V
0.600
V
EN
= 0V
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
5.0
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Output Regulation
vs. Input Voltage
1.6%
10
Current Limit
vs. Input Voltage
ENABLE THRESHOLD (V)
1.20
1.00
0.80
0.60
0.40
0.20
0.00
Enable Threshold
vs. Input Voltage
Rising
Falling
OUTPUT REGULATION (%)
1.4%
1.2%
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V
OUT
= 1.8V
I
OUT
= 0A to 2A
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
CURRENT LIMIT (A)
8
6
4
2
V
OUT
= 1.8V
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3000
Switching Frequency
vs. Input Voltage
ENABLE INPUT CURRENT (µA)
Enable Input Current
vs. Input Voltage
1.50
1.25
1.00
0.75
0.50
0.25
0.00
V
EN
= V
IN
2.5
3.0
3.5
4.0
4.5
5.0
5.5
100
Power Good Threshold/V
REF
Ratio vs. Input Voltage
V
PG
THRESHOLD/V
REF
(%)
90
80
70
60
50
40
30
20
10
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V
REF
= 0.62V
SWITCHING FREQUENCY (kHz)
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V
OUT
= 1.8V
I
OUT
= 0A
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
August 2012
4
M9999-082912-A
Micrel Inc.
MIC23201
Typical Characteristics (Continued)
V
IN
Operating Supply Current
vs. Temperature
50
10
V
IN
Shutdown Current
vs. Temperature
V
IN
= 3.3V
I
OUT
= 0A
V
EN/DLY
= 0V
3.0
2.9
V
IN
UVLO Threshold
vs. Temperature
I
OUT
= 0A
SWITCHING
VIN THRESHOLD (V)
40
V
OUT
= 1.8V
SHUTDOWN CURRENT (µA)
SUPPLY CURRENT (mA)
V
IN
=3.3V
9
8
7
6
5
4
3
2
1
0
-50
-25
0
25
50
2.8
2.7
Rising
2.6
2.5
2.4
2.3
2.2
Falling
30
20
10
0
-50
-25
0
25
50
75
100
125
75
100
125
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
0.640
Feedback Voltage
vs. Temperature
LOAD REGULATION (%)
Load Regulation
vs. Temperature
2.0%
1.8%
0.50%
Line Regulation
vs. Temperature
V
IN
= 2.7V to 5.5V
FEEDBACK VOLTAGE (V)
LINE REGULATION (%)
0.632
1.6%
1.4%
1.2%
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
V
IN
= 3.3V
V
OUT
= 1.8V
I
OUT
= 0A to 2A
0.00%
V
OUT
= 1.8V
0.624
-0.50%
0.616
V
IN
= 3.3V
V
OUT
= 1.8V
I
OUT
= 0A
0.600
-50
-25
0
25
50
75
100
125
-1.00%
0.608
-1.50%
-2.00%
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
Switching Frequency
vs. Temperature
3000
1.20
Enable Threshold
vs. Temperature
10
V
IN
= 3.3V
Current Limit
vs. Temperature
SWITCHING FREQUENCY (kHz)
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
-50
-25
0
25
50
75
100
125
V
IN
= 3.3V
V
OUT
= 1.8V
I
OUT
= 0A
0.70
-50
-25
0
25
50
75
ENABLE THRESHOLD (V)
1.00
Rising
0.90
CURRENT LIMIT (A)
1.10
8
6
4
0.80
Falling
2
V
IN
= 3.3V
V
OUT
= 1.8V
0
100
125
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
August 2012
5
M9999-082912-A
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