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MIC2145 Dataheets PDF



Part Number MIC2145
Manufacturers Micrel Semiconductor
Logo Micrel Semiconductor
Description High Efficiency 2.5W Boost Converter
Datasheet MIC2145 DatasheetMIC2145 Datasheet (PDF)

MIC2145 Micrel, Inc. MIC2145 High Efficiency 2.5W Boost Converter General Description Features The MIC2145 is a small size boost switching regulator that can provide over 2.5W of output power. The input voltage range is between 2.4V to 16V, making the device suitable for one-cell Li-Ion and 3- to 4-cell alkaline/NiCad/NiMH applications. The output voltage of the MIC2145 can be adjusted up to 16V. The MIC2145 is well suited for portable, space-sensitive applications. Its typical 450kHz operat.

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MIC2145 Micrel, Inc. MIC2145 High Efficiency 2.5W Boost Converter General Description Features The MIC2145 is a small size boost switching regulator that can provide over 2.5W of output power. The input voltage range is between 2.4V to 16V, making the device suitable for one-cell Li-Ion and 3- to 4-cell alkaline/NiCad/NiMH applications. The output voltage of the MIC2145 can be adjusted up to 16V. The MIC2145 is well suited for portable, space-sensitive applications. Its typical 450kHz operation allows small surface mount external components to be used. The MIC2145 has a low quiescent current of 200µA, and a typical shutdown current of 0.5µA. The MIC2145 is capable of high efficiencies in a small board area. The MIC2145 features a low-on resistance internal switch that allows it to provide over 2.5W of output power. The peak switch current can be programmed through an external resistor. This allows the user to set the peak switch current at the level where maximum efficiency occurs. It also allows the user to further optimize for efficiency and inductor size by setting the peak current below the level of inductor saturation. • 2.4V to 16V input voltage • Output adjustable to 16V • Programmable peak current limit • Soft start • Up to 450kHz switching frequency • 0.5µA shutdown current • 200µA quiescent current • Capable of 5V/ 500mA output with 3.3V input • Achieves over 85% efficiency • Implements low power BOOST, SEPIC, and FLYBACK topologies • MSOP-8 and 3mm×3mm MLF™-10L Applications • Flash LED driver • LCD bias supply • White LED driver • DSL bias supply • Local 3V to 5V conversion The MIC2145 is available in an MSOP-8 and 3mm×3mm MLF™-10L package with an ambient operating temperature range from –40°C to +85°C. Ordering Information Part Number Standard Pb-Free MIC2145BMM MIC2145YMM MIC2145BML MIC2145YML Voltage Adj Adj Ambient Temp. Range –40°C to +85°C –40°C to +85°C Package 8-lead MSOP 10-lead MLF™ Typical Application VIN 3.0V to 5.0V CIN 10µF/6.3V I Limit L1 10µH 1 EN 5 SW 4 PGND 6 VDD MIC2145BMM 3 RSET FB 7 D1 2 SS SGND 8 VOUT 10V/150mA COUT 10µF/16V EFFICIENCY (%) 10V Output Efficiency 90 85 80 75 70 65 VIN = 3.0V 6010 100 1000 OUTPUT CURRENT (mA) Adjustable Output Boost Converter with Programmable Peak Switch Current MLF and MicroLeadFrame are trademarks of Amkor Technologies, 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 April 2005 1 M9999-042205 MIC2145 Pin Configuration EN 1 SS 2 RSET 3 PGND 4 8 SGND 7 FB 6 VDD 5 SW 8-Lead MSOP (MM) Micrel, Inc. EN SS RSET PGND PGND 1 2 3 4 5 10 SGND 9 FB 8 VDD 7 SW 6 SW 3mm×3mm MLF-10L (ML) Pin Description Pin Number MSOP 1 Pin Number MLF 1 22 33 4 4, 5 5 6, 7 68 79 8 10 Pin Name EN SS RSET PGND SW VDD FB SGND Pin Function Enable (Input): Logic high (≥1.5V) enables regulator. Logic low (≤0.7V) shuts down regulator. Do not float. Soft Start Capacitor (External Component): Connect external capacitor to ground to control the rise time of the output voltage. Current Limit (External Component): Sets peak current limit of the internal power MOSFET using an external resistor. Power Ground (Return): Internal power MOSFET source. Switch Node (Input): Internal power MOSFET drain. Supply (Input): +2.4V to +16V for internal circuitry. Feedback (Input): Output voltage sense node. Small Signal Ground (Return): Ground M9999-042205 2 April 2005 MIC2145 Absolute Maximum Ratings (Note 1) Supply Voltage (VDD) .................................................... 18V Switch Voltage (VSW) .................................................... 18V Feedback Voltage (VFB) ................................................ 18V Switch Current (ISW) ........................................................ 2A Enable Voltage(VEN), Note 5 ........................................ 18V RSET Voltage (VRSET) .................................................... 6V ESD Rating, Note 3 ...................................................... 2kV Ambient Storage Temperature(TS) .......... –65°C to +150°C Micrel, Inc. Operating Ratings (Note 2) Supply Voltage (VDD) ....................................... 2.4V to 16V Switch Voltage (VSW) .................................................... 16V Ambient Temperature (TA) ......................... –40°C to +85°C Junction Temperature (TJ) ....................... –40°C to +125°C Package Thermal Resistance MSOP θJA (MSOP-8) .................................................... 206°C/W θJA (3mm×3mm MLF-10) .................................... 60°C/W Electrical Characteristics (Note 6) VDD = 10V, VOUT = 10V, IOUT = 100mA; TJ =25°C, unless otherwise noted, bold values indicate –40°C ≤ TJ ≤ 125°C. Parameter Condition Min Typ Max Supply Voltage 2.4 16 Shutdown Current Quiescent Current Feedback Voltage Reference EN = 0.3V, VDD = 10V, VFB=1.35V EN = VDD, VDD = 10V, VFB = 1.35V (±2%) 0.5 5 200 300 1.058 1.08 1.102 .


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