MIC22600
1MHz, 6A Integrated Switch
Synchronous Buck Regulator
NOT RECOMMENDED FOR NEW DESIGNS
SEE MIC22705
General Description
The Micrel MIC22600 is a high-efficiency, 6A, integrated
switch, synchronous buck (step-down) regulator. The
MIC22600 is optimized for highest efficiency and achieves
more than 90% efficiency, while still switching at 1MHz
over a broad load range with only 1µH inductor and down
to 47µF 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. The MIC22600 offers a full range of sequencing
and tracking options. The EN/DLY pin combined with the
Power Good/Power-on-Reset (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
∆V
on start-up.
®
The MIC22600 is available in a 24-pin 4mm x 4mm MLF
and thermally-enhanced 24-pin ePad TSSOP with a
junction operating 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
•
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Input voltage range: 2.6V to 5.5V
Output voltage adjustable down to 0.7V
Output current up to 6A
Full sequencing and tracking ability
Power-on-Reset/Power Good
Efficiency > 90% across a broad load range
Ultra-fast transient response, easy RC compensation
100% maximum duty cycle
Fully-integrated MOSFET switches
Micropower shutdown
Thermal-shutdown and current-limit protection
24-pin 4mm x 4mm MLF
®
24-pin ePad TSSOP
–40°C to +125°C junction temperature range
High power density point-of-load conversion
Servers and routers
DVD recorders
Computing peripherals
Base stations
FPGAs, DSP and low-voltage ASIC power
Applications
Typical Application
MIC22600 6A 1MHz Synchronous Output Converter
Note:
1. Using a free-wheeling Schottky diode improves efficiency.
Sequencing & Tracking
Ramp Control is a trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademarks of 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
June 2011
M9999-062411-D
Micrel, Inc.
MIC22600
Ordering Information
Part Number
MIC22600YML
MIC22600YTSE
Note:
MLF is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
®
Voltage
Adjustable
Adjustable
Junction Temperature Range
–40° to +125°C
–40° to +125°C
Package
24-Pin 4mm x 4mm MLF
®
24-pin ePad TSSOP
Lead Finish
Pb-Free
Pb-Free
Pin Configuration
PGND
PGND
PVIN
SVIN
EP
SGND
COMP
FB
PVIN
SW
SW
SW
PGND
SW
PGND
SW
SW
SW
PVIN
EN/DLY
DELAY
RC
POR/PG
PVIN
24-Pin 4mm x 4mm MLF (ML)
SW
24-pin ePad TSSOP
June 2011
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M9999-062411-D
Micrel, Inc.
MIC22600
Pin Description
Pin Number
MLF-24
1, 6, 13, 18
17
Pin Number
TSSOP-24
3, 10, 15, 22
2
Pin Name
PVIN
SVIN
Description
Power Supply Voltage (Input): Requires bypass capacitor to GND.
Signal Power Supply Voltage (Input): Requires bypass capacitor to GND.
EN/DLY (Input): When this pin is pulled higher than the enable threshold, 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 voltage.
Ramp Control: Capacitor to ground from this pin determines slew rate of output
voltage during start-up. This can be used for tracking capability as well as soft
start. RC pin cannot be left floating. Use a minimum capacitor value of 220pF or
larger.
Feedback: Input to the error amplifier, connect to the external resistor divider
network to set the output voltage.
Compensation pin (Input): Place a RC network to GND to compensate the
device, see 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.
Power Ground (Signal): Ground
Signal Ground (Signal): Ground
DELAY (Input): Capacitor to ground sets internal delay timer. Timer delays
power-on reset (POR) output at turn-on and ramp down at turn-off.
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.
2
11
EN/DLY
4
13
RC
14
15
5
7, 12, 19, 24
16
3
8, 9, 10, 11,
20, 21, 22, 23
EP
23
24
14
4, 9, 16, 21
1
12
5, 6, 7, 8,
17, 18 19, 20
EP
FB
COMP
POR/PG
PGND
SGND
DELAY
SW
GND
June 2011
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M9999-062411-D
Micrel, Inc.
MIC22600
Absolute Maximum Ratings
(1)
Supply Voltage (PVIN, SVIN)............................ –0.3V to 6V
Output Switch Voltage (SW) ............................. –0.3V to 6V
Output Switch Current (I
SW
).......................Internally Limited
Logic Input Voltage (EN, POR, DELAY) ........... –0.3V to V
IN
Control Voltage (RC, COMP, FB) ..................... –0.3V to V
IN
Lead Temperature (soldering 10sec.)........................ 260°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD 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
4x4 MLF-24 (θ
JC
) ...............................................14°C/W
4x4 MLF-24 (θ
JA
) ...............................................40°C/W
24-pin ePad TSSOP (θ
JC
)...............................12.9°C/W
24-pin ePad TSSOP (θ
JA
) ...............................32.2°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
V
IN
Turn-On Voltage Threshold
UVLO Hysteresis
Quiescent Current, PWM Mode
Shutdown Current
Feedback Voltage
FB Pin Input Current
Current Limit in PWM Mode
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
Switch ON-Resistance PFET
Switch ON-Resistance NFET
Oscillator Frequency
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
V
IN
rising
V
EN
≥1.34V;
V
FB
= 0.9V (not switching)
V
EN
= 0V
±
1%
±
2% (over temperature)
V
FB
= 0.5*V
NOM
V
OUT
1.8V, V
IN
= 2.6 to 5.5V, I
LOAD
= 100mA
100mA < I
LOAD
< 6000mA, V
IN
= 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
0.7
1
9
0.2
0.2
0.03
0.025
1
1.24
1
1
Max.
5.5
2.6
1300
10
0.707
0.714
100
11.5
Units
V
V
mV
µA
µA
V
nA
A
%
%
%
Ω
0.693
0.686
6.5
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
0.8
1.14
0.7
0.7
1.2
1.34
1.3
1.3
1
2
MHz
V
µA
µA
µA
mV
130
7.5
10
2
160
20
12.5
%
%
°C
°C
June 2011
4
M9999-062411-D
Micrel, Inc.
MIC22600
Typical Characteristics
June 2011
5
M9999-062411-D
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