MIC22600
1MHz 6A Integrated Switch
Synchronous Buck Regulator
General Description
The Micrel MIC22600 is a high efficiency 6A Integrated
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. A full
range of sequencing and tracking options is available with
the MIC22600. The Enable/Delay pin combined with the
Power Good/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
®
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
•
•
•
•
•
•
•
•
•
•
•
•
•
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
®
–40°C to +125°C junction temperature range
Applications
•
•
•
•
•
•
High power density point of load conversion
Servers and routers
DVD recorders
Computing peripherals
Base stations
FPGAs, DSP and low voltage ASIC power
Typical Application
Efficiency V
O
- 3.3V
100
95
90
85
80
75
70
65
60
55
50
0
V
IN
- 5V
1
2
3
4
5
6
OUTPUT CURRENT (A)
7
MIC22600 6A 1MHz Synchronous Output Converter
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
September 2007
M9999-092007-A
Micrel, Inc.
MIC22600
Ordering Information
Part Number
MIC22600YML
Voltage
Adj.
Junction Temp. Range
–40° to +125°C
Package
24-Pin 4x4 MLF
®
Lead Finish
Pb-Free
Pin Configuration
PGND
PGND
PVIN
SVIN
SGND
COMP
FB
PVIN
SW
SW
SW
PGND
SW
PGND
SW
SW
SW
SW
PVIN
EN
DELAY
RC
POR/PG
PVIN
24-Pin 4mm x 4mm MLF (ML)
Pin Description
Pin Number
1, 6, 13, 18
17
2
Pin Name
PVIN
SVIN
EN
Description
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 1.2x band gap reference. When the pin is
pulled higher that 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: 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.
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, 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.
4
RC
14
15
5
7, 12, 19, 24
16
3
8, 9, 10, 11,
20, 21, 22, 23
EP
FB
COMP
POR/PG
PGND
SGND
DELAY
SW
GND
September 2007
2
M9999-092007-A
Micrel, Inc.
MIC22600
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
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
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 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
(turn-on)
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
V
nA
A
%
%
%
Ω
Ω
MHz
V
µA
µA
µA
µA
mV
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
130
7.5
10
2
160
20
12.5
%
%
°C
°C
September 2007
3
M9999-092007-A
Micrel, Inc.
MIC22600
Typical Characteristics
10
8
6
4
2
0
0
25°C
Shutdown Current
vs. Input Voltage
10
8
6
4
2
0
Shutdown Current
vs. Temperature
1.2
1.0
0.8
0.6
0.4
0.2
Operating Current
vs. Input Voltage
25°C
V
IN
= 3.3V
TEMPERATURE (°C)
1
2
3
4
5
INPUT VOLTAGE (V)
6
0
2
Not switching FB = 1V
3
4
5
6
INPUT VOLTAGE (V)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Operating Current
vs. Temperature
0.710
0.708
0.706
0.704
0.702
0.700
0.698
0.696
0.694
0.692
0.690
2
Reference Voltage
vs. Input Voltage
0.710
0.708
0.706
0.704
Reference Voltage
vs. Temperature
25°C
0.702
0.700
0.698
0.696
0.694
0.692
0.690
V
IN
= 3.3V
TEMPERATURE (°C)
V
IN
= 3.3V
Not switching FB = 1V
TEMPERATURE (°C)
3
4
5
INPUT VOLTAGE (V)
6
1.30
Enable Voltage
vs. Input Voltage
1.30
Enable Voltage
vs. Temperature
24
20
Enable Hystersis
vs. Temperature
1.25
1.25
16
1.20
25°C
1.20
12
8
V
IN
- 5V
1.15
1.15
4
V
IN
- 3V
1.10
2
3
4
5
INPUT VOLTAGE (V)
6
1.10
TEMPERATURE (°C)
0
TEMPERATURE (°C)
1100
1080
1060
1040
1020
1000
980
960
940
920
900
Frequency
vs. Temperature
50
45
40
35
30
25
20
15
10
5
0
2
P-Channel RDS
ON
vs. Input Voltage
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
Output Voltage
vs. Ramp Control Voltage
V
IN
- 5V
90°C
V
IN
- 2.5V
2.5
TEMPERATURE (°C)
3 3.5 4 4.5 5
INPUT VOLTAGE (V)
5.5
0.2
0
0
0.2 0.4 0.6 0.8 1.0 1.2
RAMP CONTROL VOLTAGE (V)
September 2007
4
M9999-092007-A
Micrel, Inc.
MIC22600
Typical Characteristics (continued)
Efficiency V
O
- 1.2V
100
95
V
IN
- 3.6V
90
V
IN
- 2.5V
85
80
V
IN
- 5V
75
70
65
60
55
50
0
1
2
3
4
5
6
OUTPUT CURRENT (A)
Efficiency V
O
- 1.8V
100
V
IN
- 2.5V
95
V
IN
- 3.6V
90
85
V
IN
- 5V
80
75
70
65
60
55
50
0
1
2
3
4
5
6
OUTPUT CURRENT (A)
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency V
O
- 3.3V
V
IN
- 5V
1
2
3
4
5
6
OUTPUT CURRENT (A)
7
7
7
50
40
30
20
10
0
-10
-20
-30
-40
-50
1
Bode Plot
(V
IN
- 3.3V, V
O
- 1.8V)
Gain 6A
Phase 6A
10
100
FREQUENCY (kHz)
180
144
108
72
36
0
-36
-72
-108
-144
-180
1000
50
40
30
20
10
0
-10
-20
-30
-40
-50
1
Bode Plot
(V
IN
- 5V, V
O
- 1.8V)
180
144
108
72
36
-36
-72
-108
-144
-180
1000
50
40
30
20
10
0
-10
-20
-30
-40
-50
1
Bode Plot
(V
IN
- 5V, V
O
- 3.3V)
180
144
108
72
36
-36
-72
-108
-144
-180
1000
Gain 6A
Phase 6A
10
100
FREQUENCY (kHz)
Gain 6A
Phase 6A
10
100
FREQUENCY (kHz)
September 2007
5
M9999-092007-A
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