MIC68400 Evaluation Board 4A Sequencing LDO with Tracking and Ramp Control™ General Description Features The MIC68400 is a high peak current LDO regulator designed specifically for powering applications such as FPGA core voltages that require high start up current with lower nominal operating current. Capable of sourcing 4A of current from start-up, the MIC68400 provides high power from a small MLF leadless package. The MIC68400 can also implement a variety of power-up and power-down protocols such as sequencing, tracking, and ratiometric tracking. The MIC68400 operates from a wide input range of 1.65V to 5.5V. The MIC68400 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 and turn-off. On board jumpers allow selection of on board delay caps, tracking, or sequencing mode. • • • • • • • • • • Stable with 10uF ceramic capacitor Input voltage range: 1.65V to 5.5V Adjustable output voltage down to 0.5V 4A maximum output current – peak start up 3A 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 Tiny 4mm x 4mm MLFTM package Terminal Description PCB Connections Terminal Name J1 VIN Input J2 GND Ground J3 VOUT Output J4 GND Ground J5 POR Power On Reset (Power Good Flag) J6 EN Terminal Function Enable MLF and MicroLeadFrame are 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 December 2005 M9999-120105 (408) 955-1690 Micrel, Inc. MIC68400 Schematic Programming Jumpers Jumper Number Jumper Name Jumper Function JP1 POR1 Source [1:2] – Use VIN1; JP2 Delay1 Source [1:2] – Use C3 (on board delay); [2:3] – NC (min delay) [2:3] – NC (min ramp slope) [2:3] – Use VO1 (min Q Current) JP3 RC1 Source [1:2] – Use C4 (on board ramp slope); JP4 ADJ Voltage Select [1:2] – 1.5V [3:4] – 1.8V [5:6] – 2.5V No Jumper – 0.5V [7:8] – 3.3V Ordering Information Part Number Description MIC68400YML EV Evaluation board with MIC68400YML adjustable device. NOTE: For additional voltage options, contact Micrel Marketing. December 2005 2 M9999-120105 (408) 955-1690 Micrel, Inc. MIC68400 Applications Information Typical Jumper Connections (Using two MIC68400YML EV boards) Enable Input VIN1 & VIN2 J1 JP1 JP2 JP3 JP4 JP5 JP6 JP7 JP8 J6 J6 Description POR 1 DLY 1 RC 1 VO 1 POR 2 DLY 2 RC 2 VO 2 EN 1 EN 2 Delayed Sequencing: U2 Master w/ VOUT = 2.5V U1 Slave w/ VOUT = 1.8V U2 J6 3.3V 1:2 1:2 2nF 2:3 3:4 1:2 1:2 2:3 5:6 U2 POR EXT Windowed Sequencing: U1 Master w/ VOUT = 2.5V U2 Slave w/ VOUT = 1.8V U1 J6 3.3V 1:2 1:2 2nF 2:3 5:6 1:2 1:2 2:3 3:4 EXT U1 POR Normal Tracking: U1 Master w/ VOUT = 2.5 V U2 Slave w/ VOUT = 1.8V U1, U2 J6 3.3V 1:2 1:2 1:2 5:6 1:2 2:3 U1 VO (1) 3:4 EXT EXT Ratiometric Tracking: U1 Master w/ VOUT = 2.5 V U2 Slave w/ VOUT = 1.8V U1, U2 J6 3.3V 1:2 1:2 1:2 3nF 5:6 1:2 2:3 U1 RC 3:4 EXT EXT Note: 1. Requires external resistor divider connected to output pin of unit 1. December 2005 Delayed Sequencing Windowed Sequencing Normal Tracking Ratiometric Tracking 3 M9999-120105 (408) 955-1690 Micrel, Inc. MIC68400 GND. The formula for output voltage given resistance R from device adjust pin to GND is: Enable Input The enable input is programmed via J6. The MIC68400 may be enabled 3 ways: 1) From VIN (short EN and VIN jumpers), 2) From POR of adjacent device (Connect EN to POR output of adjacent device) 3) From External source (drive the EN jumper) Voltage Adjustment VOUT = 0.5 x ( 1 + ( 10.0K / R ) ) NOTE: If the MIC68400 adjustable device is replaced by a fixed device, R1 should be shorted or replaced with a low value resistor (1 Ohm). Power on Reset (POR) POR may be observed via J5. Jumper JP1 allows the POR pullup resistor to be supplied from either VIN (Pins 1&2 shorted) or VOUT (Pins 2&3 shorted). Target voltage for the MIC68400 is controlled via JP4. Jumper settings are: 1) Pins 1&2 – 1.5V 2) Pins 3&4 – 1.8V 3) Pins 5&6 – 2.5V 4) Pins 7&8 – 3.3V Delay Programming The Delay is programmed via JP2. For delay can be either minimum (Open, or Pins 2&3 shorted) or approximately 1mSec (Pins 1&2 shorted). Ramp Control Ramp Control and Tracking is programmed via JP3. Shorting Pins 1&2 sets the output turn-on slew time (time from turn on to full output) to approximately 0.5mSec for U1. Other voltages are possible by changing resistor values or adding a resistance from the adjust pin to December 2005 4 M9999-120105 (408) 955-1690 Micrel, Inc. MIC68400 Bill of Materials Item Part Number Manufacturer Description C1, C2 GRM188R60J106ME47D muRata 10µF/6.3V X5R C1608X5R0J106K TDK JMK107 BJ106MA TAIO YUDEN Qty. 2 08056D106KAT AVX 10uF/10V X5R C3 VJ0603A102KXQPW1BC Vitramon 1nF/10V C4 VJ0603Y222KXXCW1BC Vitramon 2.2nF/25V 1 R1, R6 CRCW06031002FKEYE3 Vishay Dale 10K , 0603, 1/16W, 1% 2 R1 CRCW06030000FKEYE3 Vishay Dale Fixed Voltage: 0 Ohm , 0603, 1/16W, 1%, R2-R5 open 1 R2 CRCW06034991FKEYE3 Vishay Dale 4.99K , 0603, 1/16W, 1% 1 R3 CRCW06033831FKEYE3 Vishay Dale 3.83K , 0603, 1/16W, 1% 1 R4 CRCW06032491FKEYE3 Vishay Dale 2.49K , 0603, 1/16W, 1% 1 R5 CRCW06031781FKEYE3 Vishay Dale 1.78K , 0603, 1/16W, 1% 1 U1 MIC68400YML Micrel, Inc. 4A FPGA LDO Regulator 1 1 Notes: 1. AVX: www.avx.com 2. Murata: www.murata.com 3. TDK: www.tdk.com 4. Vishay: www.vishay.com 5. Taiyo Yuden: www.t-yuden.com 6. Vitramon: www.vitramon.com 7. Micrel Semiconductor: December 2005 www.micrel.com 5 M9999-120105 (408) 955-1690 Micrel, Inc. MIC68400 PCB Layout Artwork TOP BOTTOM TOP SILKSCREEN December 2005 6 M9999-120105 (408) 955-1690 Micrel, Inc. MIC68400 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. © 2006 Micrel, Incorporated. December 2005 7 M9999-120105 (408) 955-1690