MIC4930
Hyper Speed Control™ 3A Buck Regulator
General Description
The MIC4930 is a high-efficiency, 3A synchronous buck
regulator with ultra-fast transient response perfectly suited
for supplying processor core and I/O voltages from a 5V or
3.3V bus. The MIC4930 provides a switching frequency up
to 3.3MHz while achieving peak efficiencies up to 95%. An
additional benefit of high-frequency operation is very low
output ripple voltage throughout the entire load range with
the use of a small output capacitor. The MIC4930 is
designed for use with a very small inductor, down to 1µH,
and an output ceramic capacitor as small as 10µF without
the need for external ripple injection. A wide range of
output capacitor types and values can also be
accommodated.
The MIC4930 supports safe start-up into a pre-biased
output.
The MIC4930 is available in a 10-pin 3mm × 4mm DFN
package with an operating junction temperature range
from –40°C to +125°C. The MIC4930 is pin-to-pin
compatible with the 5A-rated MIC4950YFL.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
Input voltage: 2.7V to 5.5V
3A output current
Up to 95% efficiency
Up to 3.3MHz operation
Safe start-up into a pre-biased output
Power Good output
Ultra-fast transient response
Low output voltage ripple
Low R
DS(ON)
integrated MOSFET switches
0.01µA shutdown current
Thermal shutdown and current limit protection
Output voltage as low as 0.7V
3mm × 4mm DFN-10L
–40C to +125C junction temperature range
Applications
DTVs
Set-top boxes
Printers
DVD players
Distributed power supplies
Typical Application
Hyper Speed Control 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
March 20, 2014
Revision 1.1
Micrel, Inc.
MIC4930
Ordering Information
Part Number
MIC4930YFL
Note:
1. Other options are available. Contact Micrel for details.
2. DFN is a GREEN, RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen free.
(1)
Top Mark
MIC4930
Temperature Range
–40°C ≤ T
J
≤ +125°C
Package
(2)
Lead Finish
Pb-Free
10-pin 3mm × 4mm DFN
Pin Configuration
3mm × 4mm DFN (FL)
(Top View)
Pin Description
Pin Number
1, 2, EP
3, 8
4
5
6
7
9
10
Pin Name
PGND
PVIN
AVIN
AGND
FB
PG
EN
SW
Pin Function
Power ground.
Power input voltage: Connect a 10µF ceramic capacitor between PVIN and PGND for input
decoupling. Pins 3 and 8 are internally connected inside the package.
Analog input voltage: Connect a 1µF ceramic capacitor between AVIN and AGND to decouple the
noise for the internal reference and error comparator.
Analog ground input: Connect to a quiet ground plane for best operation. Do not route power
switching currents on the AGND net. Connect AGND and PGND nets together at a single point.
Feedback (input): Connect an external divider between VOUT and AGND to program the output
voltage.
Power Good (output): Open-drain output. A pull-up resistor from this pin to a voltage source is
required to detect an output power-is-good condition.
Enable (input): Logic high enables operation of the regulator. Logic low will shut down the device.
Do not leave floating.
Switch (output): Internal power MOSFET output switches.
March 20, 2014
2
Revision 1.1
Micrel, Inc.
MIC4930
Absolute Maximum Ratings
(3)
PVIN, AVIN Supply Voltage (V
IN
) .................... –0.3V to +6V
SW Output Switch Voltage (V
SW
). ..................... –0.3V to V
IN
EN, PG (V
EN
, V
PG
) ............................................. –0.3V to V
IN
FB Feedback Input Voltage (V
FB
) ...................... –0.3V to V
IN
Storage Temperature (Ts)......................... –65°C to +150°C
(5)
ESD Rating ........................................................ 2kV, HBM
Operating Ratings
(4)
Supply Voltage (V
IN
) ..................................... +2.7V to +5.5V
Enable Input Voltage (V
EN
) ..................................... 0V to V
IN
Junction Temperature Range (T
J
).......–40°C ≤ T
J
≤ +125°C
Thermal Resistance
DFN-10 (
JA
) ...................................................... 35°C/W
Electrical Characteristics
(6)
V
IN
= V
EN
= 3.3V; L = 1.0µH; T
A
= 25°C, C
IN
= 10µH, C
OUT
= 10µH unless otherwise specified.
Bold
values indicate –40°C≤ T
J
≤ +85°C, unless otherwise noted.
Symbol
V
IN
V
UVLO
V
UVLOH
I
Q
I
SD
V
FB
I
LIMIT
Parameter
Supply voltage range
Undervoltage lockout threshold
Undervoltage lockout hysteresis
Quiescent current
Shutdown current
Feedback voltage
Current limit
FB = 0.9V × V
FB(Nominal)
V
IN
= 2.7V to 3.5V, V
OUTNOM
= 1.8V,
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
< 3A, V
IN
= 3.6V
if V
OUTNOM
< 2.5V
20mA < I
LOAD
< 3mA, V
IN
= 5.0V
if V
OUTNOM
≥ 2.5V
R
DSON-P
R
DSON-N
PWM switch ON resistance
I
SW
= 1A P-Channel MOSFET
I
SW
= 1A N-Channel MOSFET
I
OUT
= 0mA, FB >1.2 × V
FB(Nominal)
V
EN
= 0V
0.609
3.5
(turn-on)
Condition
Min.
2.7
2.41
2.5
400
0.8
0.01
0.625
5.75
2
2
0.640
8
Typ.
Max.
5.5
2.61
Units
V
V
mV
mA
µA
V
A
LINEREG
Output voltage line regulation
1
%/V
0.3
%
LOADREG
Output voltage load regulation
1
%
30
25
mΩ
March 20, 2014
3
Revision 1.1
Micrel, Inc.
MIC4930
Electrical Characteristics Continued
(6)
V
IN
= V
EN
= 3.3V; L = 1.0µH; T
A
= 25°C, C
IN
= 10µH, C
OUT
= 10µH unless otherwise specified.
Bold
values indicate –40°C≤ T
J
≤ +85°C, unless otherwise noted.
Symbol
Parameter
Condition
V
IN
= 4.5V, V
FB
= 0.5V
t
ON
Maximum turn-on time
V
IN
= 3.0V, V
FB
= 0.5V
V
IN
= 2.7V, V
FB
= 0.5V
t
OFF
t
SOFT-ON
V
EN
I
EN
V
OUTPG
V
OUTPGH
T
SD
T
SDH
Notes:
3. Exceeding the absolute maximum ratings may damage the device.
4. The device is not guaranteed to function outside its operating ratings.
5. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
6. Specification for packaged product only.
Min.
Typ.
665
1000
1120
176
500
Max.
Units
ns
Minimum turn-off time
Soft-start time
Enable threshold
Enable input current
Power Good threshold
Power Good hysteresis
Overtemperature shutdown
Overtemperature shutdown
hysteresis
V
IN
= 3.0V, V
FB
= 0.5V
V
OUT
= 90% of V
OUTNOM
Turn-on
0.5
ns
µs
1.2
1
94
V
µA
%
%
°C
°C
0.8
0.1
Rising
82
88
7
150
20
March 20, 2014
4
Revision 1.1
Micrel, Inc.
MIC4930
Typical Characteristics
March 20, 2014
5
Revision 1.1
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