MIC2267 Datasheet PDF - MICREL

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MIC2267
MICREL

Part Number MIC2267
Description Input Current Limiting Synchronous Buck Regulator
Page 19 Pages


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MIC2267
Input Current Limiting
Synchronous Buck Regulator
USB Power Maximizer™
General Description
The MIC2267 is a USB Power Maximizer™ which
transfers the maximum power from the limited USB current
source by shaping the input current limit profile. It
incorporates a high efficiency, integrated synchronous step
down regulator. Internal 150mswitches and adjustable
operating frequency allows the MIC2267 to achieve
greater than 90% efficiency across a broad load range. It
replaces the USB current limit switch, 5V buck regulator
and minimizes capacitance for many USB applications.
The adjustable frequency control can be utilized to move
harmonics away from sensitive frequency bands.
The MIC2267 allows the input current limit profile to be
shaped for various applications. With a current mode
control with external compensation, the MIC2267 transient
response can be optimized over load and output
capacitance making it highly flexible for many applications.
Additional features include 1µA shutdown current, output
current limit and thermal shutdown protection. The
MIC2267 is available in a 12-pin 3mm x 3mm MLF® with a
junction operating range from –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
Input voltage range: 3.0V to 5.5V
Output voltage adjustable down to 1.0V
Up to 96% efficiency at 500mA output
Efficiency >90% across a broad load range
Fast transient response
Adjustable frequency from 400kHz to 1.5MHz
Adjustable input current limiting 100mA to over 1A
100% maximum duty cycle
Fully integrated MOSFET switches
Micropower shutdown
Thermal shutdown and output current limit protection
12-pin 3mm x 3mm MLF®
Junction temperature range: 40°C to +125°C
Applications
USB power
Wireless router cards
General buck converter applications
_______________________________________________________________________________________________________
Typical Application
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MIC2267 USB Input Current Limiting Synchronous Buck Regulator
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency vs.
Output Current
VIN = 4.2V
VIN = 5.5V
VOUT = 3.3V
0.5 1 1.5
OUTPUT CURRENT (A)
2
Efficiency 5VIN to 3.3VOUT
USB Power Maximizer is a trademark of Micrel, 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
January 2011
M9999-011711-A



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Ordering Information
Part Number
Voltage
Mark Code
Temperature Range
MIC2267YML
Adjustable
2267
–40°C to +125°C
Note:
1. Package is GREEN RoHS compliant. Lead finish is NiPdAu. Mold compound is halogen free.
Pin Configuration
MIC2267
Package(1)
12-Pin 3mm x 3mm MLF®
12-Pin 3mm x 3mm MLF® (ML)
(Top View)
Pin Description
Pin Number
1
Pin Name
AGND
2 FB
3 COMP
4 PGOOD
5 SW
6 PGND
7 VIN
8 EN
9 FILTER
10 LIMIT
11 SLOPEC
www.Dat1aS2heet4U.com FREQ
ePAD
HS Pad
Pin Function
Analog Ground: The ground return for the low power blocks of the MIC2267.
Feedback (Input): Input to the error amplifier. Connect a resistor divider between VOUT and
ground to adjust the output voltage.
Compensation Pin: Output of the internal gm error amplifier. Place a series connected,
Resistor and Capacitor to GND for external compensation.
Power Good (Output): Open drain of an N-Channel MOSFET. Connect a resistor to VIN or
VOUT for power good signalling.
Switch (Output): Internal power MOSFET output switches.
Power Ground: The ground return for the switching currents.
Power Supply Voltage (Input): Requires bypass capacitor to GND
Enable/Delay (Input): Apply a Logic High to start the device. Apply Logic Low to stop the
device; placing it in a low quiescent current mode.
Input Current Limit Filter: Place a capacitor to VIN to adjust the time constant for the input
current limit filter.
Input Current Limit: Place a resistor to ground to adjust the average current limit from the input
supply.
Slope Compensation: Sets current mode slope compensation
Frequency Control: The switching frequency is adjusted from 400kHz to 1.5MHz with a resistor
from this pin to ground.
Exposed Heatsink Pad: Thermal connection between die and external ground plane. A solid
connection to a large ground plane is required for full output power. This pad must be
connected to ground.
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Micrel Inc.
MIC2267
Absolute Maximum Ratings (1)
Supply Voltage (VIN) ........................................ 0.3V to +6V
Output Switch Voltage (VSW) ........................... 0.3V to +6V
Power Good Voltage (VPGOOD) ........................ 0.3V to +6V
Enable Input Voltage (VEN)................................ 0.3V to VIN
Feedback Voltage (VFB) .................................... 0.3V to VIN
AGND to PGND Voltage .............................. 0.3V to +0.3V
Switch Current (ISW) .................................Internally Limited
Power Dissipation .....................................Internally Limited
Lead Temperature (soldering, 10sec.)....................... 260°C
ESStoDraHgeumTeamn pBeordaytuMreod(Tesl)R..a..t.i.n..g...(.3.)..........................6..5..°.C....t.o...+..1..5. 20k°CV
ESD Machine Model Rating (3) .....................................200V
Operating Ratings (2)
Supply Voltage (VIN)..................................... +3.0V to +5.5V
Power Good Voltage (VPGOOD) ......................... 0V to +5.5V
Enable Input Voltage (VEN) .................................... 0V to VIN
Feedback Voltage (VFB) ........................................ 0V to VIN
AGND to PGND Voltage .............................. 0.3V to +0.3V
Junction Temperature (TJ) ........................ –40°C to +125°C
Junction Thermal Resistance
3mm x 3mm MLF®-12(θJA).................................61°C/W
3mm x 3mm MLF®-12(θJC).................................27°C/W
Electrical Characteristics (4)
VIN = VEN = 5.0V, VOUT = 3.3V, ILOAD = 10mA, CIN = 10µF, L = 4.7µH, COUT = 47µF, RFREQ = 100k; RSLOPEC = 100k, RLIM = 100k,
RCOMP = 11.5k, CCOMP = 15nF, TA = 25°C; bold values indicate –40°C TJ 125°C; unless noted.
Parameter
Conditions
Min. Typ. Max. Units
Power Input Supply
Input Voltage Range (VIN)
VIN UVLO Threshold
Rising
3.0
2.75 2.9
5.5
3.0
V
V
VIN UVLO Hysteresis
320 mV
Quiescent Current
PWM Mode, VEN > 1.8V, VFB = 0.9V, IOUT = 0A
1 mA
Shutdown Current
Reference Voltage
VEN = 0V
1 5 µA
Feedback Voltage
±2% over temperature
0.98 1 1.02 V
Feedback Bias Current
VFB = 1V
1 nA
Output Voltage Line Regulation
Output Voltage Load Regulation
VIN = VEN = 4V to 5.5V, ILOAD = 100mA
100mA < ILOAD < 1.2A
0.2 %
0.2 %
Enable Control
Enable Logic High Threshold
1.2 1.8
V
Enable Logic Low Threshold
0.4 1
V
Input Current Limit
VFB = 0.5V, RLIMIT = 107k
0.5
Input Current Limit
VFB = 0.5V, RLIMIT = 68.1k
0.7
VFB = 0.5V, RLIMIT = 46.4k
1.1
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, 1.5kin series with 100pF.
4. Specification for packaged product only.
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0.7
1.1
1.6
0.9
1.5
2.1
A
January 2011
3 M9999-011711-A



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Micrel Inc.
MIC2267
Electrical Characteristics (4)
VIN = VEN = 5.0V, VOUT = 3.3V, ILOAD = 10mA, CIN = 10µF, L = 4.7µH, COUT = 47µF, RFREQ = 100k; RSLOPEC = 100k, RLIM = 100k,
RCOMP = 11.5k, CCOMP = 15nF, TA = 25°C; bold values indicate –40°C TJ 125°C; unless noted.
Parameter
Conditions
Min.
Typ.
Max. Units
Soft Start
Soft Start
Adaptive
Internal FETs
Top MOSFET RDS(ON)
Bottom MOSFET RDS(ON)
ISW = 500mA, VFB = 0.9V
ISW = 500mA, VFB = 1.1V
136 225 m
100 225 m
Oscillator/PWM
Oscillator Frequency
RFREQ = 250k
RFREQ = 100k
RFREQ = 60k
0.32 0.4 0.48
0.8 1 1.2 MHz
1.2 1.5 1.8
Maximum Duty Cycle
VFB < 0.5V
100 %
Thermal Protection
Over Temperature Shutdown
Over Temperature Shutdown
Hysteresis
Power Good
Power Good Threshold
Power Good Output Low
Voltage
Power Good Leakage Current
VOUT Rising (VOUT % below nominal)
VFB = 0.9V, IPGOOD = 5mA
VFB = 1.0V, VPGOOD = 5.5V
160 °C
20 °C
6.5 10 12.5 %
130 200 mV
1 µA
2
Note:
4. Specification for packaged product only.
www.DataSheet4U.com
January 2011
4 M9999-011711-A



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