MIC68200-1.2YML

MIC68200 MICREL | Alldatasheet

Document overview

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• PDF pages: 15

Technical content

Features

• Stable with 4.7µF ceramic capacitor
• Input voltage range: 1.65V to 5.5V
• 0.5V reference
• + 1.0% initial output tolerance
• 2A maximum output current – peak start up
• 1A Continuous Operating Current
• Tracking on turn-on and turn-off with pin strapping
• Timing Controlled Sequencing On/Off
• Programmable Ramp Control™ for in-rush current limiting and slew rate control of the output voltage on Turn-On and Turn-Off
• Power-on Reset (POR) supervisor with programmable delay time
• Single Master can control multiple Slave regulators with tracking output voltages
• Tiny 3mm x 3mm MLF® package
• Maximum dropout (V IN – VOUT) of 500mV over temperature at 1A output current
• Fixed and Adjustable Output Voltages
• Excellent line and load regulation specifications
• Logic controlled shutdown
• Thermal shutdown and current limit protection

Applications

• FPGA/PLD Power Supply
• Networking/Telecom Equipment
• Microprocessor Core Voltage
• High Efficiency Linear Post Regulator
• Sequenced or Tracked Power Supply

Micrel, Inc. MIC68200 July 2006 2 M9999-071206 (408) 955-1690 Typical Application 4.7µF 4.7µF 1nF V IN = 3.3V EN MIC68200-1.8YML IN OUT EN SNS RC DLY GND POR µProcessor I/O CORE /RESET 47KΩ MIC68200-1.5YML IN OUT EN SNS RC DLY GND POR 10nF 0.7nF 0.6nF Master Slave Sequenced Dual Power Supply for I/O and Core Voltage of µProcessor U1.EN U1.RC U1.DLY U1.OUT U2.EN= U1.POR U2.RC U2.DLY U2.OUT U2.POR U1.TRC U1.TDLY U2.TRC U2.TDLY U1.TDLY U2.TDLY U1 Fully Shut Down U2 Fully Shut Down

Micrel, Inc. MIC68200 July 2006 3 M9999-071206 (408) 955-1690 4.7µF 4.7µF 10nF V IN = 1.8V EN MIC68200-1.5YML IN OUT EN RC DELAY GND POR µProcessor I/O CORE /RESET 47KΩ 10nF MIC68200-1.2YML IN OUT EN RC DELAY GND POR Master Slave Tracking Dual Power Supply for I/O and Core Voltage of µProcessor U1.EN=U2.EN U1.RC U1.DLY U2.RC=U1.OUT U2.DLY U2.OUT U1.POR=U2.POR U1.TRC U2.TDLY U2.TDLY U1 Fully Shut Down U2 Fully Shut Down

Micrel, Inc. MIC68200 July 2006 4 M9999-071206 (408) 955-1690 Block Diagram

Ordering Information

Temp. Range Package MIC68200-1.2YML ZC12 2.0A 1.2V –40° C to +125°C PB-Free 10-Pin 3x3 MLF ® MIC68200-1.5YML ZC15 2.0A 1.5V –40° C to +125°C PB-Free 10-Pin 3x3 MLF ® MIC68200-1.8YML ZC18 2.0A 1.8V –40° C to +125°C PB-Free 10-Pin 3x3 MLF ® MIC68200-2.5YML ZC25 2.0A 2.5V –40° C to +125°C PB-Free 10-Pin 3x3 MLF ® MIC68200-3.3YML ZC33 2.0A 3.3V –40° C to +125°C PB-Free 10-Pin 3x3 MLF ® MIC68200YML ZAAA 2.0A ADJ –40°C to +125°C PB-Free 10-Pin 3x3 MLF ® Note: For additional voltage options, contact Micrel Marketing.

Micrel, Inc. MIC68200 July 2006 5 M9999-071206 (408) 955-1690 Pin Configuration EP5 11 0 10-Pin 3mm × 3mm MLF (ML) MIC68200-x.xYML (Fixed) MIC68200YML (Adjustable) Pin Description (Pin Numbering may change depending on layout considerations) 3x3 MLF-10 Fixed 3x3 MLF-10 Adjustable Pin Name Pin Function 1,2 1,2 IN Input: Input voltage supply pin. Place a capacitor to ground to bypass the input supply 3 3 DLY Delay: Capacitor to ground sets internal delay timer. Timer delays power-on reset (POR) output at turn-on and ramp down at turn-off. 4 4 RC Ramp Control: Voltage driven for tracking applications. Capacitor to ground sets slew rate during start-up. 5 5 EN Enable (Input): CMOS compatible input. Logic high = enable and logic low = shutdown. 6, EP 6, EP GND Ground: EP is connected to ground on 3x3 MLF-10L. 7 7 POR Power-on Reset: Open-drain output device indicates when the output is in regulation. High (open) means device is regulating within 10%. POR onset can be delayed using a single capacitor from Delay to ground. 8 8 SNS Adjustable regulators: Feedback input. Connect to external resistor voltage divider. Fixed regulators: Sense pin. Connect to output at load for point-of- load regulation. 9, 10 9,10 OUT Output Voltage: Output of voltage regulator. Place capacitor to ground to bypass the output voltage. Minimum load current is 100uA. Nominal bypass capacitor is 4.7uf ceramic.

Micrel, Inc. MIC68200 July 2006 6 M9999-071206 (408) 955-1690 Absolute Maximum Ratings(1) Operating Ratings(2) Package Thermal Resistance Electrical Characteristics(5) TA = 25°C with VIN = VOUT + 1V; VEN = VIN; IOUT = 10mA; bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Parameter Conditions Min Typ Max Units Output Voltage Accuracy 10mA < I OUT < IL(max), VOUT + 1 ≤ VIN ≤ 5.5V -2 +2 % Feedback Voltage Adjustable version only 0.49 0.50 0.51 V Feedback Current Adjustable version only 10 nA Output Voltage Line Regulation V IN = VOUT + 1V to 5.0V 0.06 0.5 V Output Voltage Load Regulation I L = 0mA to 2A 0.3 1 % VIN – VO; Dropout Voltage I L = 500mA IL = 1.0A IL = 2.0A 140 200 300 250 400 600 mV mV mV Ground Pin Current I L = 10mA IL = 500mA IL = 1.0A IL = 2.0A 1.5 mA mA mA mA Shutdown Current V EN = 0V; VOUT = 0V 0.01 10 µA Current Limit V OUT = 0V; VIN = 3.0V 2.0 3.4 6.0 A Start-up Time V EN = VIN; CRC = Open 25 150 µs Enable Input Enable Input Threshold Regulator enable Regulator shutdown 0.2 V V Enable Hysteresis 50 100 250 mV Enable Input Current V IL ≤ 0.2V (Regulator shutdown) VIH ≤ 1V (Regulator enable) 0.8 µA µA POR Output IPOR(LEAK) V POR = 5.5V; POR = High 1 µA µA VPOR(LO) Output Logic-Low Voltage (undervoltage condition), IPOR = 1mA 60 90 mV 7.5 10 12.5 % VPOR : V OUT Ramping Up V OUT Ramping Down Threshold, % of VOUT below nominal 10 12.5 15 % Delay Current V DELAY = 0.75V 0.7 1 1.3 µA Delay Voltage (Note 6) VPOR = High 1.185 1.235 1.285 V

Micrel, Inc. MIC68200 July 2006 7 M9999-071206 (408) 955-1690 Parameter Conditions Min Typ Max Units Ramp Control IRC Ramp Control Current 0.7 1 1.3 µA IDISCHARGE(OUTPUT) (Note 7) VOUT = 0.5VREF, VRAMP =0V 25 45 70 mA Tracking Accuracy: Fixed ( Note 8) 200mV < VRC < VTARGET ; Measure (VOUT – VRC) -50 25 100 mV Tracking Accuracy: Adjustable ( Note 8) Measure (VOUT - VRC x (VTARGET / 500mV)) 2 15 50 mV Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation of any T A (ambient temperature) is PD(max) = TJ(max) – TA) / θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 5. Specification for packaged product only. 6. Timer High Voltage along with Delay pin current (1µA nom) determines the delay per uF of capacitance. Typical delay is 1.1sec/µf 7. Discharge current is the current drawn from the output to ground to actively discharge the output capacitor during the shutdown process. 8. VTARGET is the output voltage of an adjustable with customer resistor divider installed between VOUT and Adj/Sns pin, or the rated output voltage of a fixed device.

Micrel, Inc. MIC68200 July 2006 8 M9999-071206 (408) 955-1690 Typical Characteristics Ground Current vs. Output Current 0.0 2.0 OUTPUT CURRENT (A) 0.4 0.8 1.2 1.6 VIN = VOUT + 1V VOUT = 1.8V COUT = 10µF 0.5 1.5 012345 INPUT VOLTAGE (V) Output Voltage vs. Input Voltage VIN = VOUT + 1V VOUT = 1.8V COUT = 10µF IOUT = 10mA 100 150 200 250 300 350 400 Dropout Voltage vs. Output Current 0.0 2.0 OUTPUT CURRENT (mA) 0.4 0.8 1.2 1.6 VIN = VOUT + 1V VOUT = 1.8V COUT = 10µF 1.60 1.65 1.70 1.75 1.85 1.90 1.95 2.00 Output Voltage vs. Temperature 20 40 60 80 TEMPERATURE (°C) 1.80 VIN = VOUT + 1V VOUT = 1.8V COUT = 10µF 0.4 0.5 0.6 0.7 0.8 0.9 INPUT VOLTAGE (V) Enable Threshold vs. Input Voltage VOUT = 1.8V IOUT = 10mA COUT = 10µF 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 INPUT VOLTAGE (V) Current Limit vs. Input Voltage VIN = 2.8V VOUT = 1.8V COUT = 10µF 3.9 4.0 0.001 0.01 0.1 FREQUENCY (kHz) Output Noise Spectral Density 0.10.01 10 100 1,000 10,000 VIN = VOUT +1V VOUT = 1.8V COUT = 10µF

Micrel, Inc. MIC68200 July 2006 9 M9999-071206 (408) 955-1690 Functional Characteristics

Micrel, Inc. MIC68200 July 2006 10 M9999-071206 (408) 955-1690 Applications Information Enable Input The MIC68200 features a TTL/CMOS compatible positive logic enable input for on/off control of the device. High (>1V) enables the regulator while low (<.2V) disables the regulator. In shutdown the regulator consumes very little current (only a few microamperes of leakage). For simple applications the enable (EN) can be connected to V IN (IN). While MIC68200 only requires a few µA’s of enable current to turn on, actual enable pin current will depend on the overdrive (voltage exceeding 1V) in each particular application. Enable Connections for Logic Driven input IN EN OUT POR GND MIC68200-1.8BML 4.7µF RC 10nF DLY IN EN OUT POR GND MIC68200-1.5BML RC DLY 4.7µF 1nF V IN = 3.3V Control Logic High > 1V Enable Connection for VIN-Driven and/or Slow Risetime Inputs IN EN OUT POR GND MIC68200-1.8YML 4.7µF RC 10nF DLY IN EN OUT POR GND MIC68200-1.5YML RC DLY 4.7µF 1nF V IN = 3.3V 10KΩ 10nF ~ 1V/mSec Input Capacitor An input capacitor of 0.1µF or greater is recommended when the device is more than 4 inches away from the bulk supply capacitance, or when the supply is a battery. Small, surface mount chip capacitors can be used for the bypassing. The capacitor should be place within 1 inch of the device for optimal performance. Larger values will help to improve ripple rejection by bypassing the regulator input, further improving t he integrity of the output voltage. Output Capacitor The MIC68200 requires an output capacitor for stable operation. As a µCap LD O, the MIC68200 can operate with ceramic output capacitors of 4.7µF or greater with ESR’s ranging from a 3m Ω to over 300mΩ. Values of greater than 4.7µF improve transient response and noise reduction at high frequency. X7R/X5R dielectric-type ceramic capacitors are recommended because of their superior temperature performance. X7R-type capacitors change capacitance by 15% over their operating temperature range an d are the most stable type of ceramic capacitors. Larger output capacitances can be achieved by placing tantalum or aluminum electrolytics in parallel with the ceramic capacitor. For example, a 100µF electrolytic in parallel with a 4.7µF ceramic can provide the transient and high frequency noise performance of a 100µF ceramic at a significantly lower cost. Specific undershoot/overshoot performance will depend on both the values and ESR/ESL of the capacitors. Master Slave Master Slave

Micrel, Inc. MIC68200 July 2006 11 M9999-071206 (408) 955-1690 Adjustable Regulator Design OUT SNS 0.5V COUT 4.7µF *CFF 0.1µF *Required only for large values of R1 and R2. Adjustable Regulator with Resistors The adjustable MIC68200 output voltage can be programmed from 0.5V to 5.5V using a resistor divider from output to the SNS pin. Resistors can be quite large, up to 1M Ω because of the very high input impedance and low bias current of the sense amplifier. Typical sense input currents are less than 30nA which causes less than 0.3% error with R1 and R2 less than or equal to 100K Ω. For large value resistors (>50K) R1 should be bypassed by a small capacitor (C FF = 0.1µF bypass capacitor) to avoid instability due to phase lag at the ADJ/SNS input. The output resistor divider values are calculated by: ⎛ += 1R2 R10.5VOUTV Power on Reset (POR) and Delay (DLY) The power-on reset output (POR) is an open-drain N-Channel device requiring a pull-up resistor to either the input voltage or output voltage for proper voltage levels. POR is driven by the internal timer so that the release of POR at turn-on can be delayed for as much as 1 second. POR is always pulled low when enable (EN) is pulled low or the output goes out of regulation by more than 10% due to loading conditions. The internal timer is controlled by the DLY pin which has a bidirectional current source and two limiting comparators. A capacitor connected from DLY to GND sets the delay time for two functions. On start up, DLY sets the time from power good to the release of the POR. At shut down, the delay sets the time from disable (EN pin driven low) to actual ramp down of the output voltage. The current source is +/-1µA, which charges the capacitor from ~150mV (nominal disabled DLY voltage) to ~1.25V. At turn on, the DLY cap begins to charge when the output voltage reaches 90% of the target value. When the capacitor reaches 1.25V, the output of the POR is released to go high. At turn off, the DLY cap begi ns to discharge when the EN is driven low. When the cap reaches ~150mV the output is ramped down. Both delays are nominally the same, and are calculated by the same formula: () ⎟⎟ ⎛= A1 C1.1T DLY DLY µ Scale Factor is: 1.1 seconds/microfarad, 1.1 milliseconds/nanofarad, or 1.1 microseconds/picofarad. TDLYOFF is the time from lowering of EN to the start of ramp down on the off cycle. T POR is the time from raising of EN to the release (low to high edge) of the POR. This behavior means that a µP or other complex logic system is guaranteed that power has been good for a known time before the POR is released, and they are further guaranteed that once POR is pulled low, they have a known time to ‘tidy up’ memory or other registers for a well controlled shutdown. In Master/Slave configurations the timers can be used to assure that the Master is always accurately regulating when the Slave is on. Ramp Control The ramp control (RC) has a bidirectional current source and a sense amplifier, which together are used to control the voltage at the output. When RC is below the target voltage (nominal output voltage for fixed voltage parts, 0.5V for ad justable parts) the RC pin controls the output voltage. When RC is at or above the target voltage, the ou tput is controlled by the internal regulator. Tracking Applications: Driving RC from a Voltage Source Fixed Parts: If RC is driven from another (Master) regulator the two outputs will track each other until the Master exceeds the target voltage of the Slave regulator. Typically the ou tput of the MIC68200 will track above the RC input by 30mV to 70mV. This offset is designed to allow Master/Slave tracking of same-voltage regulators. Wi thout the offset, same- voltage Master/Slave configurations could suffer poor regulation. Adjustable Parts: The RC pi n on adjustable versions operates from 0V to 0.5V. To implement tracking on an adjustable version, an external resistor divider must be used. This divider is the nearly same ratio as the voltage setting divider used to drive the Sense/Adj pin. It is recommended that the ratio be adjusted to track ~50mV (2% to 3%) above the target voltage if the Master and Slave are operating at the same target voltage.

Micrel, Inc. MIC68200 July 2006 12 M9999-071206 (408) 955-1690 Ramp Up: Cap Controlled Slew Rate If a capacitor is connected to RC, the bidirectional current source will charge the cap during startup and discharge the cap during shutdown. The size of the capacitor and the RC current (1µA nom) control the slew rate of the output voltage during startup. For example, to ramp up a 1.8V regulator from zero to full output in 10mSec requires a 5.6nF capacitor. For Fixed Versions: ⎛= A1 CVT RC OUTRC µ RC ON C A1SR µ Similarly, to slew an adjustable (any output voltage) from 0 to full output in 10mSec requires a 20nF cap. For Adjustable Versions: ⎛= A1 CV5.0T RC RC µ RC OUTON C A12VSR µ Ramp Down: Turn Off Slew Rate When EN is lowered and the DLY pin has discharged, the RC pin and the OUT pin slew toward zero. For fixed voltage devices, the RC pin slew rate is 2 to 3 times the SR ON defined above. For adjustable voltage devices the RC pin slew is much higher. In both cases, turn off slew rate may be determined by the RC pin for low values of out put capacitor, or by the maximum discharge current available at the output for large values of output capacitor. Turn off slew rate is not a specified characteristic of the MIC68200. Sequencing Configurations Sequencing refers to timing based Master/Slave control between regulators. It allows a Master device to control the start and stop timing of a single or multiple Slave devices. In typical sequencing the Master POR drives the Slave EN. The sequence begins with the Master EN driven high. The Master output ramps up and triggers the Master DLY when the Master output reaches 90%. The Master DLY then determines when the POR is released to enable the Slave device. When the Master EN is driven low, the Master POR is immediately pulled low causing the Slave to ramp down. Howeve r, the Master output will not ramp down until the Master DLY has fully discharged. In this way, the Master power can remain good after the Slave has been ramped down. In sequencing configurations the Master DLY controls the turn-on time of the Slave and the Slave DLY controls the turn-off time of the Slave. Sequencing Connections IN EN OUT POR GND MIC68200-1.8YML CDlyM RC DLY IN EN OUT POR GND MIC68200-1.2YML RC DLY 4.7µF VIN = 2.5V CDlyS I/O µProcessor Core /RESET 4.7µF EN 10K 10K Master Slave Delayed Sequencing CDlyS > CDlyM [CDlyS=2nF; CDlyM=1nF] Windowed Sequencing CDlyS < CDlyM [CDlyS=1nF; CDlyM=2nF]

Micrel, Inc. MIC68200 July 2006 13 M9999-071206 (408) 955-1690 Tracking Configurations Normal Tracking In normal tracking the Slave RC pin is driven from the Master output. The internal control buffering assures that the output of the Slave is always slightly above the Master to guarantee that the Slave properly regulates (based on its own internal reference) if Master and Slave are both fixed voltage devices of the same output voltage. The schematic and plot below show a 1.2 volt device tr acking a 1.8 volt device through the entire turn-on / turn-off sequence. Note that since the RC pin will ov erdrive the target voltage (to assure proper regulation) the ramp down delay is longer than the POR delay during turn-on. Fixed Voltage Devices 4.7µF 4.7µF V IN = 2.5V EN MIC68200-1.8YML IN OUT EN SNS RC DLY GND POR 10K MIC68200-1.2YML IN OUT EN SNS RC DLY GND POR 1nF 1nF VOUT1 VOUT2 PORNC Master Slave Fixed voltage versions of MIC68200 have two internal voltage dividers: one for setting the output voltage and the other for driving the trac king circuitry. Adjustable parts have up to two external dividers: one from output to SNS (to set the output voltage) and one from the output to the Slave RC pin (in tracking configurations). Also, the RC pin in fixed parts operates at the same voltage as the output, whereas the RC pin in adjustable par ts operates at the 0.5V reference. To setup a normal tracking configuration, the divider driving the Slave RC pin is the same ratio (or nearly the same – if both Master and Slave are set to the same output voltage, the Slave RC divider should be adjusted 2% to 4% higher) as the divider driving the Slave SNS pin. This is shown below. Adjustable Voltage devices 4.7µF 4.7µF VIN = 3.3V EN MIC68200YML IN OUT EN SNS RC DLY GND POR 10K MIC68200YML IN OUT EN SNS RC DLY GND POR 10.0K 1.0K 2.50K 383Ω 10.0K 3.83K VOUT1 VOUT2 POR NC 2nF 1nF Master Slave

Micrel, Inc. MIC68200 July 2006 14 M9999-071206 (408) 955-1690 Ratiometric Tracking Ratiometric tracking allows independent ramping speeds for both regulators so that the regulation voltage is reached at the same time. This is accomplished by adding a resistor divider between the Master output pin and the Slave RC pin. The divider should be scaled such that the Slave RC pin reaches or exceeds the target output voltage of the Slave as the Master reaches its target voltage. Fixed Voltage Devices 4.7µF 4.7µF V IN = 2.5V EN MIC68200-1.8YML IN OUT EN SNS RC DLY GND POR 10K 1nF 1.5K 1nF MIC68200-1.2YML IN OUT EN SNS RC DLY GND POR VOUT1 VOUT2 PORNC Master Slave Ratiometric tracking may be used with adjustable parts by simply connecting the RC pins of the Master and Slave. Use a single RC capacitor of twice the normal value (since twice the current is injected into the single RC cap). Alternatively, adjustable parts may use ratiometric tracking in a manner similar to standard tracking, with the tracking divider changed to the same resistor ratio driving the Master Adj/Sns pin. Adjustable Voltage Devices 4.7µF 4.7µF VIN = 3.3V EN MIC68200YML IN OUT EN SNS RC DLY GND POR 10KΩ MIC68200YML IN OUT EN SNS RC DLY GND POR 10.0K 2.5K 3.83K 10.0K 3nF 1nF NC VOUT1 VOUT2 POR Master Slave Final Note on Tracking The MIC68200 does not fully shutdown until the output load is discharged to near zero. If RC is driven from an external source in a tracking configuration, and the external source does not go to zero on shutdown it may prevent complete shutdown of the MIC68200. This will cause no damage, but some Q current will remain and may cause concern in battery operated portable equipment. Also, when RC is driven in tracking mode, pulling EN low will not cause the output to drop. Maintaining low EN in tracking mode simply means that the MIC68200 will shutdown when the tracking voltage gets near zero. In no case can the MIC68200 enter the tracking mode unless EN is pulled high.

Micrel, Inc. MIC68200 July 2006 15 M9999-071206 (408) 955-1690

Package Information

10-Pin 3mm x 3mm MLF (ML) 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. © 2005 Micrel, Inc.