MIC22601
4 MHz, 6A Integrated Switch
Synchronous Buck Regulator
General Description
The Micrel MIC22601 is a high efficiency 6A Integrated
switch synchronous buck (step-down) regulator. The
MIC22601 is optimized for highest efficiency (greater than
90%), while still switching at 4MHz over a broad load
range with only 0.22µH inductor and down to 22µF output
capacitor. The ultra-high speed control loop keeps the
output voltage within regulation even under extreme
transient load swings commonly found in FPGAs and low
voltage ASICs. The output voltage can be adjusted down
to 0.7V to address all low voltage power needs. A full
range of sequencing and tracking options is available with
the MIC22601. The enable/delay pin, combined with the
power good PG/POR pin, allows multiple outputs to be
sequenced in any way during turn on and turn off. The RC
(Ramp Control™) pin allows the device to be connected to
another product in the MIC22xxx and/or MIC68xxx family,
to keep the output voltages within a certain
ΔV
on start up.
The MIC22601 is available in a 24-pin 4mm x 4mm MLF
®
package with a junction operating temperature range from
–40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Input voltage range: 2.6V to 5.5V
4MHz PWM frequency
Adjustable output voltage option down to 0.7V
Output current to 6A
Small Passive components: 0.22µH and 22µF
Full sequence and tracking ability
Power On Reset/Power Good
Ultra fast transient response
– Easy RC compensation
100% maximum duty cycle
Fully integrated MOSFET switches
Micro power shutdown
Thermal shutdown and current limit protection
24-pin 4mmx4mm MLF
®
package
–40°C to +125°C junction temperature range
Applications
•
•
•
•
•
•
High power density point of load conversion
Servers and routers
Blu-ray/DVD players and recorders
Computer peripherals
Base stations
FPGA, DSP and low voltage ASIC power
_____________________________________________________________________________________________________________________________________
Typical Application
Efficiency
vs. Load Current
100
90
80
70
60
50
40
0
V
IN
= 3.6V
V
IN
= 5V
V
OUT
= 3.3V
T
A
= 25°C
L = 470nF
1
2
3
4
5
OUTPUT CURRENT (A)
6
Figure 1. Typical Application Circuit, 6A 4MHz Synchronous Output Converter
Ramp Control is a trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology, Inc.
Sequencing & Tracking
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2009
M9999-050509-A
Micrel, Inc.
MIC22601
Ordering Information
Part Number
MIC22601YML
®
Voltage
Adj.
Junction Temp. Range
–40° to +125°C
Package
24-Pin 4x4 MLF
®
Lead Finish
Pb-Free
Note:
MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
PGND
PGND
PVIN
SVIN
EP
SGND
COMP
FB
PVIN
SW
SW
SW
PGND
SW
PGND
SW
SW
SW
SW
PVIN
EN
DELAY
RC
POR
PVIN
24-Pin 4mm x 4mm MLF
®
(ML)
Pin Description
Pin Number
1, 6, 13, 18
17
2
Pin Name
PVIN
SVIN
EN
Pin Name
Power Supply Voltage (Input): Requires bypass capacitor to GND.
Signal Power Supply Voltage (Input): Requires bypass capacitor-to-
GND.
Enable/Delay (Input): This pin has a 1.24V band gap reference. When
the pin is pulled higher than this the part will start up. Below this voltage
the device is in its low quiescent current mode. The pin has a 1µA
current source charging it to VIN. By adding a capacitor to this pin a
delay may easily be generated. The enable function will not operate with
an input voltage lower than the min specified.
Ramp Control: A capacitor-to-ground from this pin determines the slew
rate of the output voltage during start-up. This can be used for tracking
capability as well as soft start.
Feedback: Input to the error amplifier, connect to the external resistor
divider network to set the output voltage.
Compensation pin (Input): Place a RC-to-GND to compensate the
device, refer to the applications section.
Power On Reset (Output): Open-drain output device indicates when the
output is out of regulation and is active after the delay set by the delay
pin. High when the Power is Good
Power Ground (Signal): Ground
Signal Ground (Signal): Ground
Delay (Input): Add a capacitor to set the delay from FB reaching 90%
nominal to POR asserting high.
Switch (Output): Internal power MOSFET output switches.
Exposed Pad (Power): Must make a full connection to a GND plane for
full output power to be realized.
4
RC
14
15
5
FB
COMP
POR/PG
7, 12, 19, 24
16
3
8, 9, 10, 11,
20, 21, 22, 23
EP
PGND
SGND
DELAY
SW
GND
May 2009
2
M9999-050509-A
Micrel, Inc.
MIC22601
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .........................................................6V
Output Switch Voltage (V
SW
) ............................................6V
Output Switch Current (I
SW
).......................Internally Limited
Logic Input Voltage (V
EN
, V
LQ
)........................... V
IN
to –0.3V
Storage Temperature (T
s
) .........................–65°C to +150°C
Lead Temperature (soldering 10sec.)........................ 260°C
EDS Rating
(3)
................................................................+2kV
Operating Ratings
(2)
Supply Voltage (V
IN
)......................................... 2.6V to 5.5V
Junction Temperature (T
J
) ..................–40°C
≤
T
J
≤
+125°C
Thermal Resistance
4mm x 4mm MLF-24 (θ
JC
) ................................. 14ºC/W
4mm x 4mm MLF-24 (θ
JA
) .................................40°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
= V
EN
= 3.3V; V
OUT
= 1.8V, unless otherwise specified.
Bold
values indicate –40°C≤ T
J
≤
+125°C.
Parameter
Supply Voltage Range
Under-Voltage Lockout Threshold
UVLO Hysteresis
Quiescent Current, PWM Mode
Shutdown Current
[Adjustable] Feedback Voltage
FB Pin Input Current
Current Limit
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
Switch ON-Resistance PFET
Switch ON-Resistance NFET
Oscillator Frequency 22601
EN/DLY Threshold Voltage
EN/DLY Source Current
RC Pin I
RAMP
Power On Reset I
PG(LEAK)
Power On Reset V
PG(LO)
Power On Reset V
PG
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.
4. Specification for packaged product only.
Condition
(turn-on)
V
EN
=>1.34V; V
FB
= 0.9V (not switching)
V
EN
= 0V
±
2% (over temperature)
V
FB
= 0.9*V
NOM
V
OUT
1.8V; V
IN
= 2.6 to 5.5V, I
LOAD
= 100mA
100mA < I
LOAD
< 6000mA, Vin = 3.3V
V
FB
≤
0.5V
I
SW
= 1000mA; V
FB
=0.5V
I
SW
= -1000mA; V
FB
=0.9V
Min
2.6
2.4
Typ
2.5
280
850
5
1
10
0.2
0.2
0.03
0.025
4
1.24
1
1
Max
5.5
2.6
1300
10
0.714
14
Units
V
V
mV
µA
µA
V
nA
A
%
%
%
Ω
Ω
MHz
V
µA
µA
µA
µA
mV
0.686
6
100
V
IN
= 2.6 to V
IN
= 5.5V
Ramp Control Current
V
PORH
= 5.5V; POR = High
Output Logic-Low Voltage (undervoltage condition),
I
POR
= 5mA
Threshold, % of V
OUT
below nominal
Hysteresis
3.2
1.14
0.7
0.7
4.8
1.34
1.3
1.3
1
2
130
7.5
10
2
160
20
12.5
%
%
°C
°C
May 2009
3
M9999-050509-A
Micrel, Inc.
MIC22601
Typical Characteristics
10
INPUT CURRENT (µA)
9
8
7
6
5
4
3
2
1
T
A
= 25°C
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
Shutdown Current
vs. Input Voltage
INPUT CURRENT (µA)
10
9
8
7
6
5
4
3
2
1
-40
Shutdown Current
vs. Temperature
INPUT CURRENT (mA)
Quiescent Current
vs. Input Voltage
1.2
Not Switching FB = 1V
1.0
0.8
0.6
0.4
0.2
0
2.5
T
A
= 25°C
V
IN
= 3.3V
-20
0
20
40
60
80
100
TEMPERATURE (°C)
Quiescent Current
vs. Temperature
1.0
REFERENCE VOLTAGE (V)
INPUT CURRENT (mA)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
-20
20
40
0
V
IN
= 3.3V
60
80
100
120
Not Switching FB = 1V
0.710
0.708
0.706
0.704
0.702
0.700
0.698
0.696
0.694
0.692
0.690
2.5
Reference Voltage
vs. Input Voltage
REFERENCE VOLTAGE (V)
120
0
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
0.710
0.708
0.706
0.704
0.702
0.700
0.698
0.696
0.694
0.692
-40
0.690
Reference Voltage
vs. Temperature
T
A
= 25°C
3
3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
6
V
IN
= 3.3V
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
1.3
1.28
ENABLE VOLTAGE (V)
1.26
1.24
1.22
1.2
1.18
1.16
1.14
1.12
1.1
2.5
Enable Level
vs. Input Voltage
ENABLE VOLTAGE (V)
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
-40
-20
Enable Voltage
vs. Temperature
4.8
4.6
FREQUENCY (MHz)
4.4
4.2
4
3.8
3.6
3.4
120
3.2
2.5
Switching Frequency
vs. Input Voltage
T
A
= 25°C
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
V
IN
= 5.5V
0
20
40
60
80
100
T
CASE
= 25°C
1.10
3
TEMPERATURE (°C)
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
4.8
4.6
FREQUENCY (MHz)
4.4
Switching Frequency
vs. Temperature
P-Channel RDS
ON
45
40
35
RDSON (mO)
30
25
20
15
10
5
120
0
2.5
3
T
CASE
= 90°C
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
vs. Input Voltage
OUTPUT VOLTAGE (V)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
Output Voltage
vs V
RC
4.2
4.0
3.8
3.6
3.4
-40
-20
0
20
40
3.2
V
IN
= 3.3V
V
OUT
= 1.8V
60
80
TEMPERATURE (°C)
May 2009
100
0.2
0.4
0.6
V
RC
(V)
0.8
4
M9999-050509-A
120
1
Micrel, Inc.
MIC22601
Typical Characteristics (continued)
100
90
80
70
60
50
40
0
V
OUT
= 3.3V
T
A
= 25°C
L = 470nF
1
2
3
4
5
OUTPUT CURRENT (A)
6
V
IN
= 3.6V
V
IN
= 5V
Efficiency
vs. Load Current
100
90
80
70
60
50
40
0
Efficiency
vs. Output Current
V
IN
= 2.5V
V
IN
= 3.6V
100
90
80
Efficiency
vs. Output Current
V
IN
= 3.3V
V
IN
= 5V
70
60
V
OUT
= 1.8V
T
A
= 25°C
L = 470nF
50
6
40
0
V
IN
= 5V
V
OUT
= 1V
L = 470nF
1
2
3
4
5
OUTPUT CURRENT (A)
6
1
2
3
4
5
OUTPUT CURRENT (A)
50
40
30
GAIN (dB)
20
10
0
Bode (5V to 1.8V - 6A)
470nH and 47µF
Phase
180
144
108
72
GAIN (dB)
36
0
50
40
30
20
10
0
Bode (3.3V to 1.8V - 6A)
470nH and 47µF
Phase
180
144
108
72
GAIN (dB)
36
0
50
40
30
20
10
0
Bode (5V to 3.3V - 6A)
470nH and 47µF
Phase
180
144
108
72
36
0
Gain
Gain
Gain
100µF OSCON on V
IN
1
10
100
1000 10000
FREQUENCY (kHz)
1
100µF OSCON on V
IN
10
100
1000 10000
FREQUENCY (kHz)
1
100µF OSCON on V
IN
10
100
1000 10000
FREQUENCY (kHz)
May 2009
5
M9999-050509-A
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