MIC22200
2A Integrated Switch Synchronous
Buck Regulator with Frequency
Programmable from 800kHz to 4MHz
General Description
The Micrel MIC22200 is a high-efficiency, 2A integrated
switch synchronous buck (step-down) regulator. The
MIC22200 switching frequency is programmable from
800kHz to 4MHz, allowing the customer to optimize their
designs either for efficiency or for the smallest footprint.
The regulator achieves efficiencies as high as 95% while
still switching at 1MHz over a broad load range.
The ultra high-speed control loops keep the output voltage
within regulation even under the 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 MIC22200 offers a full range of sequencing and
tracking options. The EN/DLY pin, combined with the
Power-On-Reset (POR) pin, allows multiple outputs to be
sequenced in many ways during turn on and turn off. The
RC (ramp control) pin allows the device to be connected to
another device in the MIC22X00 family of products to keep
the output voltages within a certain delta V on start up.
®
The MIC22200 is available in a 3mm × 3mm 12-pin MLF
package 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
Adjustable output voltage option down to 0.7V
Output load current to 2A
Full sequencing and tracking capability
Easy RC compensation
Power-On-Reset (POR) output
Efficiency >90% across a broad load range
Operating frequency: Programmable from 800 kHz up to
4MHz
Ultra-fast transient response
100% maximum duty cycle
Fully integrated MOSFET switches
Micropower shutdown
Thermal-shutdown and current-limit protection
Available in Pb-free 3mm × 3mm MLF-12-pin MLF
®
Package
–40°C to +125°C junction temperature range
High power density point-of-load conversion
Servers/routers
DVD recorders and multimedia players
Computing peripherals
Base stations
FPGAs, DSP and low voltage ASIC devices
Applications
_________________________________________________________________________________________________________________________
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
December 2010
M9999-120310-C
Micrel, Inc.
MIC22200
Ordering Information
Part Number
MIC22200YML
Note:
MLF is a green RoHS-compliant package. Lead finish is NiPdAu. Mold compound is halogen free.
®
Nominal Output Voltage
Adjustable
Junction Temperature Range
(1)
−40°C
to +125°C
Package
3mm × 3mm 12-Pin MLF
®
Lead Finish
Lead Free
(1)
Pin Configuration
12-Pin MLF
®
(ML)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
Pin Name
POR
RC
CF
SGND
COMP
FB
SVIN
PVIN
SW
PGND
DELAY
EN/DLY
Pin Function
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.
Ramp Control. Capacitor to GND from this pin determines the slew rate of output voltage during
start-up. This can be used for tracking capability as well as for soft start.
External capacitor to adjust switching frequency.
Signal Ground (signal): Ground (GND)
Compensation Pin (input): Placing an RC to GND will compensate the device. See Applications
section.
Feedback (input): Input to the error amplifier; connected to the external resistor divider network to
set the output voltage.
Signal Power Supply Voltage (input): Requires bypass capacitor to GND.
Power Supply Voltage (input): Requires bypass capacitor to GND.
Switch (output): From internal power MOSFET output switches.
Power Ground (power): Ground (GND)
Delay (input)
Enable (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.
Exposed Pad (Power): You must make a full connection to a GND plane for full output power to be
released.
ePad
GND
December 2010
2
M9999-120310-C
Micrel, Inc.
MIC22200
Absolute Maximum Ratings
(1)
Supply Voltage (P
VIN
, S
VIN
) ............................................+6V
Output Switch (SW)..........................................................6V
Logic Voltage (EN/DLY, POR, DELAY) ............VIN to -0.3V
Control Voltage (CF, RC, COMP, FB) ..............VIN to -0.3V
Lead Temperature (soldering 10s)............................. 260°C
Storage Temperature Range (Ts) .............−65°C to +150°C
EDS Rating
(3)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
)..................................... +2.6V to +5.5V
Junction Temperature Range (T
J
).......−40°C
≤
T
J
≤
+125°C
Thermal Resistance
3mm × 3mm MLF-12L (θ
JA
) ...............................40°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
= V
EN
= 3.3V, 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
Feedback Voltage
Oscillator Frequency
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
EN/DLY Threshold Voltage
EN/DLY Hysteresis
DELAY Threshold Voltage
DELAY Hysteresis
EN/DLY Source Current
RC Source Current
POR IPG(LEAK)
POR VPG(LO)
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. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
Condition
(turn-on)
V
EN
≥
1.34V; V
FB
= 0.9V
V
EN
= 0V
±
2% (over temperature)
Min.
2.6
2.4
Typ.
2.5
280
1.2
3.7
0.7
1
1
5.5
0.2
0.2
Max.
5.5
2.6
Units
V
V
mV
mA
µA
V
MHz
nA
A
%
%
%
2
10
0.714
1.2
8
0.686
0.8
V
FB
= 0.9*VNOM
V
IN
= 2.6V to 5.5V
100mA < I
LOAD
< 2A, V
IN
= 3.3V
VFB
≤
0.5V
I
SW
= 1000mA V
FB
=0.5V
I
SW
= -1000mA V
FB
=0.9V
V
IN
=3.3V
V
IN
=3.3V
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
2
100
0.18
0.10
1.14
1.24
12
1.14
1.24
6
0.7
0.7
1
1
1.3
1.3
1
2
135
1.34
1.34
Ω
V
mV
V
mV
µA
µA
µA
mV
December 2010
3
M9999-120310-C
Micrel, Inc.
MIC22200
Electrical Characteristics
(4)
(Continued)
T
A
= 25°C with V
IN
= V
EN
= 3.3V, unless otherwise specified. Bold values indicate
−40°C ≤
T
J
≤
+125°C
Parameter
POR VPG
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
Condition
Threshold, % of V
OUT
below nominal
Hysteresis
Min.
7.5
Typ.
10
1
160
25
Max.
12.5
Units
%
%
°C
°C
December 2010
4
M9999-120310-C
Micrel, Inc.
MIC22200
Typical Characteristics
Shutdown Current
vs. Input Voltage
Shutdown Current
vs. Temperature
10
8
6
4
2
0
2.5
10
8
6
4
1600
1500
1400
1300
1200
Quiescent Current
vs. Input Voltage
2
T
A
= 25°C
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
0
02 55 07 5 100 125
TEMPERATURE (°C)
1100
1000
2.5
3
No Switching
FB = 0.9V
T
A
= 25°C
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
1300
1250
Quiscent Current
vs. Temperature
0.71
Reference Voltage
vs. Input Voltage
0.71
Reference Voltage
vs. Temperature
0.705
0.705
1200
1150
1100
1050
1000
V
IN
= 3.3V
No Switching
FB = 0.9V
T
A
= 25°C
02 55 07 5 100 125
TEMPERATURE (°C)
0.7
T
A
= 25°C
0.695
0.7
0.695
V
IN
= 3.3V
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
0.69
2.5
0.69
02 55 07 5 100 125
TEMPERATURE (°C)
1.3
1.26
1.22
1.18
1.14
1.1
Enable Voltage
vs. Temperature
16
15
14
13
12
11
10
Enable Hysterisis
vs. Temperature
1100
1075
1050
1025
1000
975
Frequency
vs. Temperature
V
IN
= 3.3V
02 55 07 5 100 125
TEMPERATURE (°C)
9
8
V
IN
= 3.3V
02 55 07 5 100 125
TEMPERATURE (°C)
C
F
= 220pF
V
IN
= 3.3V
02 55 07 5 100 125
TEMPERATURE (°C)
950
December 2010
5
M9999-120310-C
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