MIC2807 Evaluation Board RF PA Power Management IC 2MHz, 500mA DC/DC w/DAC Input and Bypass Switch, Dual Low Noise 200mA/30mA LDO Regulators General Description The MIC2807 integrates a high performance DC/DC converter intended for powering a power amplifier (PA) in a mobile phone with dual low noise low dropout (LDO) regulators for the rest of the radio frequency (RF) section. Requirements The MIC2807 evaluation board requires an input power source that is able to deliver greater than 700mA at 2.7V. Precautions The evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN (J1) terminal may damage the device. The MIC2807 evaluation board is tailored for a Li-Ion range input supply voltage. It should not exceed 5.5V on the input. Getting Started 1. Connect an external supply to VIN. Apply desired input voltage to the VIN (J1) and ground (J6 and J10) terminals of the evaluation board, paying careful attention to polarity and supply voltage (2.7V≤ VIN ≤ 5.5V). An ammeter may be placed between the input supply and the VIN terminal to the evaluation board. Ensure that the supply voltage is monitored at the VIN terminal. The ammeter and/or power lead resistance can reduce the voltage supplied to the input. 2. Due to the R1, R2 and R3 pull-up resistors, the MIC2807’s three voltage regulators are automatically enabled upon the powering up of the input voltage on the VIN (J1) terminal. 3. Supply a voltage to the DAC (J5) terminal to program the DC/DC converter’s output voltage. DC/DC Converter Output Voltage Programming The output voltage of the DC/DC converter is 3x the voltage set on the DAC terminal. When 1.2V or greater is applied to the DAC terminal, the DC/DC converter enters bypass mode operation. During bypass mode operation, an internal power switch directly connects the input voltage (VIN [J1]) terminal to the output voltage (VO [J9]) terminal. The following equations below illustrate the relationship between the DAC terminal voltage and the output voltage terminal: Condition #1 VIN > VOUT and 0.1V ≤ VDAC < 1.2V: VOUT = VDAC x 3 Condition #2 VIN < VOUT or VDAC ≥ 1.2V: VOUT = VIN Ordering Information Part Number Description MIC2807-JJYML EV Evaluation board with the 2.5V/2.5V LDOs MIC2807-MMYML EV Evaluation board with the 2.8V/2.8V LDOs MIC2807-NNYML EV Evaluation board with the 2.85V/2.85V LDOs MIC2807-OOYML EV Evaluation board with the 2.9V/2.9V LDOs MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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 February 2008 M9999-021908-B Micrel, Inc. MIC2807 Evaluation Board Evaluation Board Schematic Bill of Materials Item C1 C2 C3,C4,C5 L1 R1 – R3 U1 Part Number C1608X5R1A225K 06036D225MAT2A GRM188R60J225KE19D VJ0402Y104KXQCW1BC C1608X5R1A104K GRM188R61C104K 06036D104MAT2A C1608X5R1A105K 0603D105MAT2A GRM188R60J105KE19D CDH3D13DSHPNP-4R7NC CDH3D13S-4R7NC ME3220-472MLB LQH32CN4R7M53 CRCW04021002FKEY3 MIC2807-JJYML MIC2807-MMYML MIC2807-NNYML MIC2807-OOYML Manufacturer Description (1) TDK AVX(2) MuRata(3) Vishay(4) TDK(1) MuRata(3) (2) AVX TDK(1) AVX(2) MuRata(3) Qty. 2.2µF/10V 2.2µF/6.3V 1 0.1µF/10V 0.1µF/16V 0.1µF/6.3V 1µF/10V 1µF/6.3V 4.7µH/1200mA 4.7µH/1150mA 4.7µH/1200mA 4.7µH/790mA 10kΩ/1% 2.5V/2.5V 2.8V/2.8V 2.85V/2.85V 2.9V/2.9V Sumida(5) Coilcraft(6) MuRata(3) Vishay(4) Micrel, Inc.(7) 1 1 1 1 1 1 1 1 1 Notes: 1. TDK: www.tdk.com 2. AVX: www.avx.com 3. Murata: www.murata.com 4. Vishay: www.vishay.com 5. Sumida: www.sumida.com 6. Coilcraft: www.coilcraft.com 7. Micrel, Inc.: www.micrel.com February 200 2 M9999-021908-B Micrel, Inc. MIC2807 Evaluation Board PCB Layout Top Layer with Silk Screen Bottom Layer with Silk Screen February 200 3 M9999-021908-B Micrel, Inc. MIC2807 Evaluation Board MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2007 Micrel, Incorporated. February 200 4 M9999-021908-B