MIC68220 Evaluation Board Dual 2A Sequencing LDO with Tracking and Ramp Control™ General Description Features The MIC68220 Evaluation Board contains a MIC68220 chip with built-in resistor dividers, delay and ramp capacitors, and programmable jumpers to allow a variety of Master/Slave configurations including sequencing, tracking, and ratiometric tracking. The MIC68220 operates from a wide input range of 1.65V to 5.5V. The MIC68220 incorporates a delay pin (Delay) for control of power on reset output (POR) at turn-on and power-down delay at turn-off. In addition there is a ramp control pin (RC) for either tracking applications or output voltage slew rate adjustment at turn-on. On board jumpers allow selection of on board delay caps, tracking, or sequencing mode. • • • • • • • • • • • Stable with 4.7uF ceramic capacitor Input voltage range: 1.65V to 5.5V Adjustable output voltage down to 0.5V 2A maximum output current – peak start up 1A Continuous Operating Current Tracking on turn-on and turn-off Timing Controlled Sequencing Programmable Ramp Control™ Power-on Reset (POR) supervisor with programmable delay time Master and Slave devices in one IC Tiny 4mm x 5mm MLF® package Terminal Description PCB Connections Terminal Name Terminal Function J1 VIN1 VIN1 J2 POR1 Power On Reset1 (Power Good Flag) J3 GND GND J4 VO1 Output1 J5 GND GND J6 VIN2 VIN2 J7 POR2 Power On Reset2 (Power Good Flag) J8 GND GND J9 VO2 Output – Device 2 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 2007 M9999-020807 (408) 955-1690 Micrel, Inc. MIC68220 Schematic Programming Jumpers Jumper Number Jumper Name Jumper Function JP1 U1 Adj Voltage Select [1:2] – 3.3V JP2 RC1 Source [1:2] – Use VO2 (Tracking); JP3 Delay1 Source [1:2] – Use C2 (on board delay); [2:3] – NC (min delay) JP4 EN1 Source [1:2] – Use VIN1 (Fastest Turn-On); [2:3] – Use POR2 (Sequencing) [3:4] – 2.5V [5:6] – 1.8V No Jumper – 0.5V [2:3] – Use C3 (on board ramp slope) JP5 POR1 Source [1:2] – Use VIN1; JP6 U2 Adj Voltage Select [1:2] – 1.2V JP7 RC2 Source [1:2] – Use C7 (on board ramp slope); JP8 Delay2 Source [1:2] – NC (min delay); JP9 EN2 Source [1:2] – Use VIN2 (Fastest Turn-On); JP10 POR2 Source [1:2] – Use VIN2; February 2007 [7:8] – 1.5V [2:3] – Use VO1 (min Q Current) [3:4] – 1.5V [5:6] – 1.8V No Jumper – 0.5V [7:8] – 2.5V [2:3] – Use VO1 (Tracking) [2:3] – Use C6 (on board delay) [2:3] – Use POR1 (Sequencing) [2:3] – Use VO2 (min Q Current) 2 M9999-020807 (408) 955-1690 Micrel, Inc. MIC68220 Ordering Information Part Number Description MIC68220YML EV Evaluation board with MIC68220YML adjustable device. NOTE: For additional voltage options, contact Micrel Marketing. Applications Information Typical Jumper Connections Enable Input VIN1 & VIN2 J1 & J6 JP1 VO 1 JP2 RC 1 JP3 DLY 1 JP4 EN 1 JP5 POR 1 JP6 VO 2 JP7 RC 2 JP8 DLY 2 JP9 EN 2 JP10 POR2 2 Delayed Sequencing: U1 Slave w/ VOUT = 1.8V U2 Master w/ VOUT = 2.5V JP9.2 3.3V 5:6 NC 1:2 2:3 1:2 7:8 NC 1:2 EXT 1:2 Windowed Sequencing: U1 Master w/ VOUT = 2.5V U2 Slave w/ VOUT = 1.8V JP4.2 3.3V 3:4 NC 1:2 EXT 1:2 4:5 NC 1:2 2:3 1:2 Normal Tracking: U1 Master w/ VOUT = 2.5 V U2 Slave w/ VOUT = 1.8V JP4.2 & JP9.2 3.3V 3:4 2:3 1:2 EXT 1:2 4:5 2:3 1:2 EXT 1:2 Ratiometric Tracking: U1 Master w/ VOUT = 2.5 V U2 Slave w/ VOUT = 1.8V JP4.2 & JP9.2 3:4 1:2 * 1:2 EXT 1:2 4:5 2:3 * 1:2 EXT 1:2 Description 3.3V External jumper between JP2.2 and JP7.2 Delayed Sequencing February 2007 Normal Tracking 3 M9999-020807 (408) 955-1690 Micrel, Inc. MIC68220 Windowed Sequencing February 2007 Ratiometric Tracking 4 M9999-020807 (408) 955-1690 Micrel, Inc. MIC68220 is: Enable Input The enable inputs are programmed via JP4 (Channel1) and JP9 (Channel2). Either device may be enabled 3 ways: 1. From VIN (short pins 1 & 2), 2. From POR of adjacent device (short pins 2 & 3) 3. From External source (drive pin 2) Voltage Adjustment Target voltage for VO1 is controlled via JP1. Jumper settings are: 1. Pins 1&2 – 3.3V 2. Pins 3&4 – 2.5V 3. Pins 5&6 – 1.8V 4. Pins 7&8 – 1.5V Target voltage for VO2 is controlled via JP6. Jumper settings are: 1. Pins 1&2 – 1.2V 2. Pins 3&4 – 1.5V 3. Pins 5&6 – 1.8V 4. Pins 7&8 – 2.5V Other voltages are possible by changing resistor values. The formula for output voltage given resistance R from device pin 18(U1) or 13(U2) to GND February 2007 VOUT = 0.5 x ( 1 + ( 10.0K / R ) ) Power on Reset (POR) POR may be observed via J2 (for Output1) or J7 (for Output2). Jumpers JP5 (for Channel1) or JP10 (for Channel2) allow the POR pullup resistor to be supplied from either VIN or VOUT. Delay Programming The Delay is programmed via JP3 (for channel1) or JP8 (for channel2). For channel1 delay can be either minimum (Open, or Pins 2&3 shorted) or approximately 1mSec (Pins 1&2 shorted). For channel2 delay can be either minimum (Open, or Pins 1&2 shorted) or approximately 2mSec (Pins 2&3 shorted). Ramp Control Ramp Control and Tracking is programmed via JP2 (for channel1) or JP7 (for channel2). Shorting Pins 2&3 sets the output turn-on slew time (time from turn on to full output) to approximately 0.5mSec for Channel1 or 1.0mSec for Channel2. Shorting Pins 1&2 of JP4 causes channel1 to track channel2. Shorting Pins 2&3 of JP9 causes channel2 to track channel1. 5 M9999-020807 (408) 955-1690 Micrel, Inc. MIC68220 Bill of Materials Item Part Number Manufacturer Description C1, C5 C1608 X5R 0J 106M TDK 10µF/6.3V X5R 2 GRM188R60J106M muRATA 06036D106KAT AVX C1608 X5R 0J 475M TDK 4.7uF/6.3V X5R 2 GRM188R60J475KE19D muRATA 08056D475MAT AVX C4, C8 Qty. C2 VJ0603A102KXQPW1BC Vitramon 1nF/25V 1 C3,C6, C7 VJ0603Y222KXXCW1BC Vitramon 2.2nF/25V 3 R1, R6, R8, R9, R14 CRCW06031002FKEYE3 Vishay Dale 10K , 0603, 1/16W, 1% 4 R2, R12 CRCW06034991FKEYE3 Vishay Dale 4.99K , 0603, 1/16W, 1% 2 R3, R11 CRCW06033831FKEYE3 Vishay Dale 3.83K , 0603, 1/16W, 1% 2 R4, R10 CRCW06032491FKEYE3 Vishay Dale 2.49K , 0603, 1/16W, 1% 2 R5 CRCW06031781FKEYE3 Vishay Dale 1.78K , 0603, 1/16W, 1% 1 R7 CRCW0603249RFKEYE3 Vishay Dale 249 , 0603, 1/16W, 1% 1 R16 CRCW06031001FKEYE3 Vishay Dale 1.0K , 0603, 1/16W, 1% 2 R13 CRCW06037151FKEYE3 Vishay Dale 7.15K , 0603, 1/16W, 1% 1 R15 CRCW06033830FKEYE3 Vishay Dale 383 , 0603, 1/16W, 1% 1 U1 MIC68220YML Micrel, Inc. 2A FPGA LDO Regulator 1 Notes: 1. AVX: www.avx.com 2. Murata: www.murata.com 3. TDK: www.tdk.com 4. Vishay: www.vishay.com 5. Vitramon: www.vitramon.com 6. Micrel Semiconductor: www.micrel.com February 2007 6 M9999-020807 (408) 955-1690 Micrel, Inc. MIC68220 PCB Layout Artwork TOP BOTTOM TOP SILKSCREEN BOTTOM SILKSCREEN 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 2007 7 M9999-020807 (408) 955-1690