MIC23303
4MHz PWM 3A Buck Regulator with
HyperLight Load™ and Power Good
General Description
The MIC23303 is a high-efficiency 4MHz 3A synchronous
buck regulator with HyperLight Load™ mode, Power Good
output indicator, and programmable soft-start. HyperLight
Load provides very high efficiency at light loads and ultra-
fast transient response, which makes the MIC23303
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 × 3mm
DFN package saves precious board space and requires
only six external components.
The MIC23303 is designed for use with a very small
inductor, down to 0.33µH, and an output capacitor as small
as 10µF that enables a total solution size less than 1mm in
height.
The MIC23303 has very low quiescent current of 24µA and
can achieve peak efficiency of 93% in continuous
conduction mode. In discontinuous conduction mode, the
MIC23303 can achieve 80% efficiency at 1mA.
The MIC23303 is available in a 12-pin 3mm × 3mm DFN
package with an operating junction temperature range
from –40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
Input voltage: 2.7V to 5.5V
Output voltage: down to 0.65
Up to 3A output current
Up to 93% peak efficiency
80% typical efficiency at 1mA
Power Good output
Programmable soft-start
24µA typical quiescent current
4MHz PWM operation in continuous mode
Ultra-fast transient response
Low ripple output voltage
−
35mVpp ripple in HyperLight Load mode
−
5mV output voltage ripple in full PWM mode
Fully-integrated MOSFET switches
0.01µA shutdown current
Thermal-shutdown and current-limit protection
12-pin 3mm × 3mm DFN
–40°C to +125°C junction temperature range
•
•
•
•
•
Applications
•
•
•
•
•
•
Portable media/MP3 players
Portable navigation devices (GPS)
WiFi/WiMax/WiBro modules
Digital Cameras
Wireless LAN cards
Portable applications
Typical Application
HyperLight Load 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
September 6, 2013
090613-2.0
Micrel, Inc.
MIC23303
Ordering Information
Part Number
MIC23303YML
Notes:
1. DFN is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
2. DFN Pin 1 identifier is ● .
Marking
Code
WYA
Nominal Output
Voltage
Adjustable
Junction
Temperature Range
–40°C to +125°C
Package
12-Pin 3mm × 3mm DFN
(1,
2)
Pin Configuration
3mm x 3mm DFN (ML)
(Top View)
Pin Description
Pin Number
(Adjustable)
1, 2
3
4
5
6
7
8
9
10, 11
12
EP
Pin Name
SW
PG
EN
SNS
FB
SS
AGND
AVIN
PVIN
PGND
ePad
Pin Function
Switch (Output): Internal power MOSFET output switches.
Power Good: Open-drain output for the power good indicator. Use a pull-up resistor from
this pin to a voltage source to detect a power good condition.
Enable (Input): Logic high enables operation of the regulator. Logic low shuts down the
device. Do not leave floating.
Sense: Connect to V
OUT
as close to output capacitor as possible to sense output voltage.
Feedback: Connect a resistor divider from the output to ground to set the output voltage.
Soft Start: Place a capacitor from this pin to ground to program the soft start time. Do not
leave floating, 2.2nF minimum C
SS
is required.
Analog Ground: Connect to central ground point where all high current paths meet (C
IN
,
C
OUT
, and PGND) for best operation.
Supply Voltage (Power Input): Analog control circuitry. Connect to PVIN.
Input Voltage: Connect a capacitor to ground to decouple the noise.
Power Ground.
Thermal pad: Connect to Ground plane for improved heat sinking.
September 6, 2013
2
090613-2.0
Micrel, Inc.
MIC23303
Absolute Maximum Ratings
(3)
Supply Voltage (V
IN
) ..........................................
−0.3V
to 6V
Sense Voltage (V
SNS
) ........................................
−0.3V
to V
IN
Output Switch Voltage (V
SW
) .............................
−0.3V
to V
IN
Enable Input Voltage (V
EN
) .. ..............................−0.3V to V
IN
Power Good Voltage (V
PG
) ................................
−0.3V
to V
IN
Storage Temperature Range ....................
−65°C
to +150°C
Lead temperature (soldering, 10s) ............................. 260°C
(5)
ESD Rating ................................................. ESD Sensitive
Operating Ratings
(4)
Supply Voltage (V
IN
) ........................................ .2.7V to 5.5V
Enable Input Voltage (V
EN
) .................................... 0V to V
IN
Sense Voltage (V
SNS
) ..................................... 0.65V to 5.5V
Junction Temperature Range (T
J
)...... .−40°C
≤
T
J
≤
+125°C
Thermal Resistance
3mm × 3mm DFN-12 (θ
JA
) ................................. 61°C/W
3mm × 3mm DFN-12 (θ
JC
) ................................. 27°C/W
Electrical Characteristics
(6)
T
A
= 25°C; V
IN
= V
EN
= 3.6V; V
OUT
=1.8V; L = 0.33µH; C
OUT
= 44µF unless otherwise specified.
Bold
values indicate –40°C
≤
T
J
≤
+125°C, unless otherwise noted.
Parameter
Supply Voltage Range
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Quiescent Current
Shutdown Current
Output Voltage Accuracy
Feedback Regulation Voltage
Current Limit
Output Voltage Line Regulation
I
OUT
= 0mA, SNS > 1.2 × V
OUT
Nominal
V
EN
= 0V; V
IN
= 5.5V
V
IN
= 3.6V if V
OUTNOM
< 2.5V, I
LOAD
= 20mA
V
IN
= 4.5V if V
OUTNOM
≥ 2.5V, I
LOAD
= 20mA
I
LOAD
= 20mA
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
Output Voltage Load Regulation
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
PWM Switch ON-Resistance
Switching Frequency
Maximum Duty Cycle
Soft Start Time
Notes:
3. Exceeding the absolute maximum rating may damage the device.
4. The device is not guaranteed to function outside its operating rating.
5. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
6. Specification for packaged product only.
7. The maximum duty cycle is limited by the fixed mandatory off time of 300ns.
8. Guaranteed by design.
(7, 8)
Condition
Min.
2.7
Typ.
Max.
5.5
Units
V
V
mV
(turn-on)
2.3
2.53
275
24
0.01
2.8
40
5
+2.5
µA
µA
%
V
A
%/V
−2.5
0.604
3.5
0.62
6.5
0.3
0.635
10
0.3
%
%
Ω
MHz
%
ms
0.7
0.075
0.055
4
80
85
1.26
I
SW
= 100mA PMOS
I
SW
=
−100mA
NMOS
I
OUT
= 300mA
V
OUT
= 90%, C
SS
= 2.2nF
September 6, 2013
3
090613-2.0
Micrel, Inc.
MIC23303
Electrical Characteristics
(6)
(Continued)
T
A
= 25°C; V
IN
= V
EN
= 3.6V; V
OUT
=1.8V; L = 0.33µH; C
OUT
= 44µF unless otherwise specified.
Bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Power Good Threshold (Rising)
Power Good Threshold Hysteresis
Power Good Delay Time
Power Good Pull-Down
Enable Threshold
Enable Input Current
Overtemperature Shutdown
Overtemperature Shutdown
Hysteresis
Condition
Moving FB from Low to High relative to 0.62V (V
FB
)
Moving FB from High to Low relative to 0.62V (V
FB
)
Rising
RPG = 5.1k from PG to VOUT
The voltage on Enable that ensures the part is ON
0.4
0.9
0.1
160
20
Min.
85
Typ.
90
20
160
200
1.2
2
Max.
95
Units
%
%
µs
mV
V
µA
°C
°C
September 6, 2013
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090613-2.0
Micrel, Inc.
MIC23303
Typical Characteristics
Efficiency vs. Load
1.8 V
OUT
Efficiency vs. Load
1.2 V
OUT
100
90
80
V
IN
= 3V
100
90
80
1000000
V
OUT
Rise Time
vs Css
100000
V
IN
= 5V
EFFICIENCY (%)
70
V
IN
= 3.6V
EFFICIENCY (%)
V
IN
= 5V
70
60
50
40
30
20
V
IN
= 3.6V
10000
60
50
40
30
20
10
0
0.0001
L = 0.33µH
C
OUT
= 44µF
0.001
0.01
0.1
1
10
RISE TIME (µs)
1000
100
10
L = 0.33µH
C
OUT
= 44µF
0.001
0.01
0.1
1
10
1
1000
10000
100000
V
IN
=3.6V
10
0
0.0001
1000000
LOAD CURRENT(A)
LOAD CURRENT (A)
CSS (pF)
Current Limit vs.
Input Voltage
8.00
30
Quiscent Current
vs. Input Voltage
1.25
1.24
Output Voltage vs.
Input Voltage
CURRENT LIMIT (A)
24
22
20
18
16
14
12
10
T
CASE
= 25°C
OUTPUT VOLTAGE (V)
7.00
QUIESCENT CURRENT (µA)
28
26
1.23
1.22
1.21
1.20
1.19
1.18
1.17
1.16
1.15
L = 0.33µH
C
OUT
= 44µF
I
OUT
=1mA
I
OUT
=20mA
6.00
5.00
4.00
3.00
2.5
3.0
3.5
4.0
4.5
V
OUT
= 1.8V
L = 0.33µH
C
OUT
= 44µF
5.0
5.5
2.5
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Output Voltage vs.
Input Voltage
1.25
1.24
1.25
1.24
Output Voltage (HLL) vs.
Load Current
1.25
1.24
Output Voltage (CCM) vs.
Load Current
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
I
OUT
=500mA
1.22
1.21
1.20
1.19
1.18
1.17
1.16
1.15
2.5
3
3.5
4
4.5
5
5.5
L = 0.33µH
C
OUT
= 44µF
1.22
1.21
1.20
1.19
1.18
1.17
1.16
1.15
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
V
IN
=3.6V
L = 33µH
C
OUT
= 44µF
OUTPUT VOLTAGE (V)
1.23
1.23
1.23
1.22
1.21
1.20
1.19
1.18
1.17
1.16
1.15
0.4
0.8
1.2
1.6
2
2.4
2.8
3.2
V
IN
=3.6V
L = 33µH
C
OUT
= 44µF
I
OUT
=2A
INPUT VOLTAGE (V)
LOAD CURRENT (A)
LOAD CURRENT (A)
September 6, 2013
5
090613-2.0
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