Instrukcja obsługi Microchip MIC23050

Microchip Niesklasyfikowane MIC23050

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MIC23050
4MHz PWM Buck Regulator with
HyperLight Load™ Switching Scheme
y, Inc. Protected by US Patent No. 7064531
l +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
HyperLight Load is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technolog
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • te
September 2011
General Description
The Micrel MIC23050 is a high-efficiency, 600mA, PWM,
synchronous buck (step-down) regulator featuring the
HyperLight Load™ patented switching scheme that offers
best-in-class light load efficiency and transient
performance while providing very-small external
components and low output ripple at all loads.
The MIC23050 also has a very-low typical quiescent
current draw of 20µA and can achieve over 89% efficiency
even at 1mA. The device allows operation with a tiny
inductor ranging from 0.47µH to 2.2µH and uses a small
output capacitor that enables a sub-1mm height.
In contrast to traditional light load schemes, the HyperLight
Load™ architecture does not need to trade off control
speed to obtain low standby currents and in doing so the
device only needs a small output capacitor to absorb the
load transient as the powered device goes from light load
to full load.
At higher loads the MIC23050 provides a constant
switching frequency of greater than 4MHz while providing
peak efficiencies greater than 93%.
The MIC23050 comes in fixed output voltage options from
0.72V to 3.3V eliminating external feedback components.
The MIC23050 is available in an 8-pin 2mm x 2mm 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: 2.7V to 5.5V HyperLight Load™
• 600mA output current
• Fixed output voltage from 0.72V to 3.3V
• Ultra-fast transient response
• 20µA typical quiescent current
• 4MHz in PWM in constant-current mode
• 0.47µH to 2.2µH inductor
• Low voltage output ripple
− 25mVPP in HyperLight Load™ mode
− 3mV output voltage ripple in full PWM mode
• >93% efficiency
• ~89% at 1mA
• Micropower shutdown
• Available in 8-pin 2mm x 2mm MLF®
• ° ° –40 C to +125 C junction temperature range
Applications
• Cellular phones
• Digital cameras
• Portable media players
• Wireless LAN cards
• WiFi/WiMax/WiBro modules
• USB-powered devices
____________________________________________________________________________________________________________
Typical Application
1 M9999-092211-E
Micrel, Inc. MIC23050
September 2011 2 M9999-092211-E
Ordering Information
Part Number Marking Nominal Output
Voltage(1) Junction Temperature Range Package(2) Lead Finish
MIC23050-CYML GKC 1.0V –40° to +125°C 8-Pin 2x2 MLF® Pb-Free
MIC23050-4YML GK4 1.2V –40° to +125°C 8-Pin 2x2 MLF® Pb-Free
MIC23050-GYML GKG 1.8V –40° to +125°C 8-Pin 2x2 MLF
® Pb-Free
MIC23050-SYML GKS 3.3V –40° to +125°C 8-Pin 2x2 MLF® Pb-Free
Notes
1. Other output voltage options available (0.72V to 3.3V), contact Micrel for details.
2. MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
1SW
EN
NC
SNS
8 PGND
VIN
AGND
CFF
7
6
5
2
3
4
8-Pin 2mm x 2mm MLF® (ML)
(Top View)
Pin Description
Pin Number Pin Name Pin Name
1 SW Switch (Output): Internal power MOSFET output switches.
2 EN Enable (Input). Logic low will shut down the device, reducing the quiescent current to less than 4µA.
Do not leave floating.
3 NC No Connect.
4 SNS Connect to VOUT to sense output voltage.
5 CFF Feed Forward Capacitor. Connect a 560pF capacitor from V
OUT to CFF pin.
6 AGND Analog Ground.
7 VIN Supply Voltage (Input): Requires bypass capacitor to GND.
8 PGND Power Ground.
Micrel, Inc. MIC23050
September 2011 3 M9999-092211-E
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ......................................................... 6V
Output Switch Voltage (VSW)............................................6V
Output Switch Current (ISW).............................................. 2A
Logic Input Voltage (VEN, VLQ)........................... VIN to –0.3V
Junction Temperature (TJ
) ....................................... +150°C
Storage Temperature Range (Ts)..............–65°C to +150°C
ESD Rating(3).................................................................. 3kV
Operating Ratings(2)
Supply Voltage (VIN)......................................... 2.7V to 5.5V
Logic Input Voltage (VEN) ....................................... 0V to VIN
Junction Temperature (TJ) ..................–40°C ≤ TJ ≤ +125°C
Thermal Resistance
2mm x 2mm MLF-8 (θJA) ...................................90°C/W
2mm x 2mm MLF-8 (θJC) ...................................45°C/W
Electrical Characteristics(4)
TA = 25°C with VIN = VEN = 3.6V; L = 1µH; C
FF = 560pF; COUT = 4.7µF; IOUT = 20mA unless otherwise specified. Bold values indicate
–40°C ≤ TJ ≤ +125°C.
Parameter Condition Min. Typ. Max. Units
Supply Voltage Range 2.7 5.5 V
Undervoltage Lockout Threshold (turn-on) 2.45 2.55 2.65 V
UVLO Hysteresis 100 mV
Quiescent Current, Hyper LL Mode I
OUT = 0mA , VSNS > 1.2*VOUT nominal 20 32 µA
Shutdown Current V
IN = 5.5V; VEN = 0V; 0.01 4 µA
Output Voltage Accuracy V
IN = 3.0V, ILOAD = 20mA –2.5 +2.5 %
Current Limit in PWM Mode SNS = 0.9*VNOM 0.65 1 1.7 A
Output Voltage Line Regulation V
IN = 3.0V to 5.5V, ILOAD = 20mA 0.5 %/V
Output Voltage Load Regulation 20mA < I
LOAD
< 500mA, 0.3 %
Maximum Duty Cycle SNS ≤ VNOM 80 89 %
PWM Switch ON-Resistance ISW = 100mA PMOS
ISW = −100mA NMOS 0.45
0.5 Ω
Ω
Frequency ILOAD = 120mA 3.4 4 4.6 MHz
Soft-Start Time VOUT = 90% 650 µs
Enable Threshold (turn-on) 0.5 0.8 1.2 V
Enable Hysteresis 35 mV
Enable Input Current 0.1 2 µA
Over-Temperature Shutdown 165 °C
Over-Temperature Shutdown
Hysteresis 20 °C
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, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.

Specyfikacje produktu

Marka: Microchip
Kategoria: Niesklasyfikowane
Model: MIC23050

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