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MIC2204YMM-TR

P1-P3P4-P6P7-P9P10-P11
April 2005 1 M9999-042205
MIC2204 Micrel, Inc.
Typical Application
MIC2204
High-Efficiency 2MHz Synchronous Buck Converter
General Description
The Micrel MIC2204 is a high-efficiency, 2MHz PWM syn-
chronous buck switching regulator. Power conversion effi-
ciency of above 95% is easily obtainable over a wide range
of applications. A proprietary internal compensation tech-
nique ensures stability with the smallest possible inductor
and ceramic output capacitor.
The MIC2204 operates from 2.3V to 5.5V input and features
internal power MOSFETs that can supply over 600mA of
output current with output voltages down to 1V. The MIC2204
implements a constant 2MHz pulse-width-modulation (PWM)
control scheme which reduces spurious noise in sensitive RF
and communication applications. Additionally, the MIC2204
can be synchronized to an external clock, or multiple MIC2204s
can easily be daisy-chained with the SYNCLOCK feature.
The MIC2204 has a high bandwidth loop (typ. 200kHz) which
allows ultra-fast transient response times. This is very useful
when powering applications that require fast dynamic re-
sponses, such as the CPU cores and RF circuitry in high-
performance cellular phones and PDAs.
The MIC2204 is available in 10-pin MSOP and 3mm × 3mm
MLF™-10L package options with an operating junction tem-
perature range from –40°C to 125°C .
Features
•Input voltage range: 2.3V to 5.5V
• Output down to 1V/ 600mA
• 2MHz PWM operation
•Ultra-fast transient response (typical 200kHz GBW)
•Internal compensation
•All ceramic capacitors
• >95% efficiency
• Fully integrated MOSFET switches
• Easily synchronized to external clock
• SYNCLOCK feature to daisy-chain multiple 2204s
• <340µA quiescent current
• Logic controlled micropower shutdown
• Thermal shutdown and current limit protection
• 10-pin MSOP and 3mm×3mm MLF™-10L
• –40°C to +125°C junction temperature range
Applications
•High-efficiency portable power
• Cellular phones
• PDAs
• 802.11 WLAN power supplies
• RF power supplies
•Li Ion battery powered applications
10nF
4.7µH
3.3V
500mA
2.3V to 6V
4.7µF
EN
65
1
SYNC_IN
SYNC_OUT
10
9
8
7
2
3
4
MIC2204BMM
Adjustable Output Synchronous Buck Converter
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
50
55
60
65
70
75
80
85
90
95
100
0 100 200 300 400 500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
Efficiency
vs. Output Current
3.6V
IN
4.2V
IN
3.3V
OUT
5V
IN
MIC2204 Micrel, Inc.
M9999-042205 2 April 2005
Ordering Information
Part Number Voltage Junction Temp. Range Package Lead Finish
MIC2204BMM Adjustable –40°C to +125°C 10-pin MSOP Standard
MIC2204YMM Adjustable –40°C to +125°C 10-pin MSOP Lead-Free
MIC2204BML Adjustable –40°C to +125°C 10-pin MLF™ Standard
MIC2204YML Adjustable –40°C to +125°C 10-pin MLF™ Lead-Free
EN FB65
1SW
VIN
SYNC_IN
SYNC_OUT
10 GND
GND
GND
BIAS
9
8
7
2
3
4
MSOP-10 (MM)
Pin Configuration
Pin Description
Pin Number Pin Name Pin Function
1SWSwitch (Output): Internal power MOSFET output switches.
2 VIN Supply Voltage (Input): Requires bypass capacitor to GND.
3 SYNC_IN SYNC_IN for the MIC2204: Sync the main switching frequency to an
external clock. Tie pin to ground if not using this function. Tying SYNC_IN
high reduces the switching frequency to 1.6MHz (See “Applications Informa-
tion” section).
4 SYNC_OUT SYNC_OUT an open collector output to feed into SYNC_IN. Float or ground
the SYNC_OUT pin if not using sync out function.
5ENA low level EN will power down the device, reducing the quiescent current to
under 15µA (typ. 6.5µA).
6FBInput to the error amplifier, connect to the external resistor divider network to
set the output voltage.
7 BIAS Internal circuit bias supply, nominally 2.3V. Must be de-coupled to signal
ground with a 0.01µF capacitor.
8, 9, 10 GND Ground.
SW
VIN
SYNC_IN
SYNC_OUT
GND
GND
GND
BIAS
1
2
3
4
10
9
8
7
56
EN FB
MLF-10 (ML)
April 2005 3 M9999-042205
MIC2204 Micrel, Inc.
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ....................................................... 6V
Output Switch Voltage (V
SW
) .......................................... 6V
Logic Input Voltage (V
EN
, V
SYNC_IN
) ............... V
IN
to –0.3V
Power Dissipation
(2)
Storage Temperature (T
S
) ....................... –65°C to +150°C
Operating Ratings
(3)
Supply Voltage (V
IN
) ................................... +2.3V to +5.5V
Junction Temperature (T
J
) ................ –40°C ≤ T
J
≤ +125°C
Package Thermal Resistance
MSOP (θ
JA
) ....................................................... 115°C/W
3mm×3mm MLF™-10L (θ
JA
) ............................... 60°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
=V
EN
= 3.5V, unless otherwise noted. Bold values indicate –40°C < T
J
< +125°C
Parameter Condition Min Typ Max Units
Supply Voltage Range 2.3 5.5 V
Current Limit V
FB
= 0.7V 0.6 1.2 2 A
Quiescent Current V
FB
= 1.1V 320 450 µA
EN = 0V 6.0 15 µA
Feedback Voltage 0.98 1.0 1.02 V
Output Voltage Line Regulation V
OUT
= 1V, V
IN
= 2.3V to 5.5V, I
LOAD
= 100mA 0.2 %
Output Voltage Load Regulation 0mA < I
LOAD
< 500mA 0.2 %
Maximum Duty Cycle V
FB
= 0.7V 100 %
Switch On-Resistance I
SW
= 300mA, V
FB
= 0.7V 0.72 Ω
I
SW
= –300mA, V
FB
= 1.1V 0.55 Ω
Oscillator Frequency 1.8 2 2.2 MHz
Sync Frequency Range 1.8 2.5 MHz
SYNC_IN Threshold 1.2 V
Sync Minimum Pulse Width 10 ns
SYNC_IN Input Current 1 2 µA
Enable Threshold 0.52 0.72 0.96 V
Enable Hysteresis 20 mV
Enable Input Current 1 2 µA
Overtemperature Shutdown 160 °C
Overtemperature Shutdown 20 °C
Hysteresis
Notes:
1. Exceeding the ABSOLUTE MAXIMUM RATINGS may damage device.
2. Absolute maximum power dissipation is limited by maximum junction temperature where P
D(MAX)
= (T
J(MAX)
–T
A
) ÷ θ
JA
.
3. The device is not guaranteed to function outside its operating rating.
4. Specification for packaged product only.
P1-P3P4-P6P7-P9P10-P11

MIC2204YMM-TR

Mfr. #:
Buy MIC2204YMM-TR
Manufacturer:
Microchip Technology / Micrel
Description:
Switching Voltage Regulators 2MHz Synchronous Buck Regulator
Lifecycle:
New from this manufacturer.
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