MIC23603
4MHz PWM 6A Buck Regulator with
HyperLight Load
®
Revision 1.1
General Description
The MIC23603 is a high-efficiency 4MHz 6A synchronous
®
buck regulator with HyperLight Load mode. HyperLight
Load provides very high efficiency at light loads and 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 4mm x 5mm DFN
package saves precious board space and requires few
external components.
The MIC23603 is designed for use with a very small
inductor, down to 0.33µH, and an output capacitor as small
as 47µF that enables a sub-1mm height.
The MIC23603 has a very low quiescent current of 24µA
and achieves as high as 81% efficiency at 1mA. At higher
loads, the MIC23603 provides a constant switching
frequency around 4MHz while achieving peak efficiencies
up to 93%.
The MIC23603 is available in 20-pin 4mm x 5mm 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
6A output current
Up to 93% efficiency and 81% at 1mA
24µA typical quiescent current
4MHz PWM operation in continuous mode
Ultra-fast transient response
Power Good
Programmable soft-start
Low voltage output ripple
− 14mVpp 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
Output voltage as low as 0.65V
20-pin 4mm x 5mm DFN
–40°C to +125°C junction temperature range
•
•
•
•
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Applications
•
5V POL supplies
•
µC/µP, FPGA and DSP power
•
Test and measurement systems
•
Barcode readers
•
Set-top box, Modems, and DTV
•
Distributed power systems
•
Networking systems
____________________________________________________________________________________________________________
Typical Application
HyperLight Load is a registered 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
November 5, 2013
Revision 1.1
Micrel Inc.
MIC23603
Ordering Information
Part Number
MIC23603YML
Notes:
1. DFN is GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Nominal Output
Voltage
ADJ
Junction
Temp. Range
–40°C to +125°C
Package
(1)
Lead Finish
Pb-Free
20-pin 4mm x 5mm DFN
Pin Configuration
20-Pin
4mm x 5mm DFN (ML)
(Top View)
Pin Description
Pin Number
1, 2, 9-12, 19, 20
3, 13, 14, 18
4
5
6
7
8,16
15
17
EP
Pin Name
SW
PVIN
PG
EN
SNS
FB
AGND
SS
AVIN
PGND
Pin Function
Switch output. Internal power MOSFET output switches.
Input voltage. Connect a capacitor to ground to decouple the noise.
Power good. Connect an external resistor to a voltage source to supply a power good indicator.
Enable input. Logic high enables operation of the regulator. Logic low shuts down the device. Do
not leave floating.
Sense input. Connect to VOUT as close to output capacitor as possible to sense output voltage.
Feedback input. Connect an external divider between VOUT and ground to program the output
voltage.
Analog ground. Connect to central ground point where all high current paths meet (CIN, COUT,
PGND) for best operation.
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.
Supply voltage. Analog control circuitry. Connect to VIN through a 10Ω resistor.
Power Ground.
November 5, 2013
2
Revision 1.1
Micrel Inc.
MIC23603
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ......................................................... 6V
Sense (V
SNS
)..................................................................... 6V
Output Switch Voltage .................................................. 6V
Enable Input Voltage (V
EN
) ................................ –0.3V to V
IN
Storage Temperature Range .................... –65°C to +150°C
(3)
ESD Rating ............................................. ESD SENSITIVE
Operating Ratings
(2)
Supply Voltage (V
IN
) ......................................... 2.7V to 5.5V
Enable Input Voltage (V
EN
) .................................... 0V to V
IN
Output Voltage Range (V
SNS
) ........................ 0.65V to 3.6V
Junction Temperature Range (T
J
)...... – 40°C
≤
T
J
≤
+125°C
Thermal Resistance
4mm x 5mm DFN-20 (θ
JA
) .............................. 44.1°C/W
Electrical Characteristics
(4)
T
A
= 25°C; V
IN
= V
EN
= 3.6V; V
OUT
= 1.8V; L = 0.33µH; C
OUT
= 47µF x 2 unless otherwise specified.
Bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Supply Voltage Range
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Quiescent Current
Shutdown Current
Feedback Voltage
Current Limit
Output Voltage Line Regulation
Output Voltage Load 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
PWM Switch ON-Resistance
Maximum Frequency
Soft Start Time
Power Good Threshold
Power Good Hysteresis
Power Good Pull Down
Enable Threshold
Enable Input Current
Overtemperature Shutdown
Overtemperature Shutdown
Hysteresis
Notes:
1. Exceeding the absolute maximum rating can damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
Condition
Turn-on
I
OUT
= 0mA , SNS > 1.2 × V
OUT
Nominal
V
EN
= 0V, V
IN
= 5.5V
Min
2.7
2.2
Typ
2.5
270
24
0.01
Max
5.5
2.8
45
5
0.636
16
Units
V
V
mV
µA
µA
V
A
%/V
%
%
Ω
MHz
µs
0.605
6.5
0.62
12
0.3
0.3
0.7
0.03
0.025
4
1200
I
SW
= 1000mA PMOS
I
SW
= –1000mA NMOS
I
OUT
= 300mA
V
OUT
= 90%, C
SS
= 2.2nF
% of V
NOMINAL
V
SNS
= 90% V
NOMINAL,
I
PG
= 1mA
Turn-On
0.4
85
90
20
95
200
%
%
mV
V
µA
°C
°C
0.8
0.1
160
20
1.2
2
November 5, 2013
3
Revision 1.1
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