MIC33030-GYHJ

MIC33030 MICREL | Alldatasheet

Document overview

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• PDF pages: 18

Technical content

Features

• Internal Inductor − Simplifies design to two external capacitors
• Input voltage: 2.7V to 5.5V
• Output voltage accuracy of ±2.5% over temperature
• 400mA output current
• Efficiency up to 78% at 1mA
• 21µA typical quiescent current
• Up to 8MHz PWM operation in continuous mode
• Ultra-fast transient response
• Low-voltage output ripple − 30mVpp ripple in HyperLight Load™ mode − 7mV output voltage ripple in full PWM mode
• Fully-integrated MOSFET switches
• 0.01µA shutdown current
• Thermal shutdown and current-limit protection
• Fixed and adjustable output voltage options available (0.7V to 3.6V)
• 2.5mm x 2.0mm 10-Lead MLF ®
• –40° C to +125°C junction temperature range

Applications

• Mobile handsets
• Portable media/MP3 players
• Portable navigation devices (GPS)
• WiFi/WiMax/WiBro modules
• Digital Cameras
• Wireless LAN cards
• USB-powered devices
• Portable applications Typical Application Fixed-Output MIC33030 Adjustable-Output MIC33030 M9999-020311-C

Micrel Inc. MIC33030 February 2011 2 M9999-020311-C

Ordering Information

MIC33030-AYHJ 3GFA ADJ –40°C to +125°C 10-pin 2.5mm x 2.0mm MLF® Pb-Free MIC33030-JYHJ 3GFJ 2.5V –40°C to +125°C 10-pin 2.5mm x 2.0mm MLF® Pb-Free MIC33030-GYHJ 3GFG 1.8V –40°C to +125°C 10-pin 2.5mm x 2.0mm MLF® Pb-Free MIC33030-4YHJ 3GF4 1.2V –40°C to +125°C 10-pin 2.5mm x 2.0mm MLF® Pb-Free Notes: 1. Other options available. Contact Micrel for details. 2. Thin MLF is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration 2.5mm x 2.0mm MLF® (HJ) 2.5mm x 2.0mm MLF® (HJ) Fixed (Top View) Adjustable (Top View) Pin Description Fixed Option ADJ Option Pin Name Pin Function 1 1 SNS Sense: Connect to VOUT as close to output capacitor as possible to sense output voltage. 2 − NC Not internally connected. − 2 FB Feedback: Connect resistor divider at this node to set output voltage. Resistors should be selected based on a nominal VFB = 0.62V. 3 3 EN Enable: Logic high enables operation of the regulator. Logic low will shut down the device. Do not leave floating. 4, 5 4, 5 SW Switch: Internal power MOSFET output switches. 6, 7 6, 7 VOUT Output Voltage: The output of the regulator. Connect to SNS pin. For adjustable option, connect to feedback resistor network. 8 8 PGND Power Ground. 9 9 AGND Analog Ground. 10 10 VIN Input Voltage: Connect a capacitor to ground to decouple the noise. EP EP HS PAD Connect to PGND or AGND.

Micrel Inc. MIC33030 February 2011 3 M9999-020311-C Absolute Maximum Ratings(1) Storage Temperature Range .. ……………-65 °C to +150°C Operating Ratings(2) Enable Input Voltage (VEN) .. ……………………….0V to V IN Output Voltage Range (VSNS) ……………… …. 0.7V to 3.6V Junction Temperature Range (TJ)... ….-40 °C ≤ TJ ≤ +125°C Thermal Resistance Electrical Characteristics(4) TA = 25°C; VIN = VEN = 3.6V; COUT = 4.7µF unless otherwise specified. Bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Parameter Condition Min. Typ. Max. Units Supply Voltage Range 2.7 5.5 V Under-Voltage Lockout Threshold (turn-on) 2.45 2.55 2.65 V Under-Voltage Lockout Hysteresis 100 mV Quiescent Current IOUT = 0mA , SNS > 1.2 * VOUT Nominal 21 35 µA Shutdown Current VEN = 0V; VIN = 5.5V 0.01 4 µA Output Voltage Accuracy VIN = 3.6V; ILOAD = 20mA -2.5 +2.5 % Feedback Voltage Adjustable Option Only 0.62 V Current Limit SNS = 0.9*VOUTNOM 0.41 0.7 1 A Output Voltage Line Regulation VIN = 3.0V to 5.5V, VOUT = 1.2V, ILOAD = 20mA, 0.5 %/V Output Voltage Load Regulation 20mA < ILOAD < 400mA, VOUT = 1.2V, VIN = 3.6V 0.7 % ISW = 100mA PMOS 0.65 Ω PWM Switch ON-Resistance ISW = -100mA NMOS 0.8 Ω Maximum Frequency IOUT = 120mA 8 MHz Soft Start Time VOUT = 90% 100 µs Enable Threshold 0.5 0.9 1.2 V Enable Hysteresis 35 mV Enable Input Current 0.1 2 µA Over-Temperature Shutdown 160 °C Over-Temperature Shutdown Hysteresis 20 °C Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 4. Specification for packaged product only.

Micrel Inc. MIC33030 Typical Characteristics February 2011 4 M9999-020311-C Efficiency vs. Load (VOUT = 2.5V) 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% EFFICIENCY (%) 0.0% 0.1 1 10 100 1000 LOAD CURRENT (mA) VIN = 3.6V VIN = 5V Efficiency vs. Load (VOUT = 1.5V) 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0%EFFICIENCY (%) 0.0% 0.1 1 10 100 1000 LOAD CURRENT (mA) VIN = 3V VIN = 3.6V VIN = 4.2V Efficiency vs. Load (VOUT = 1.8V) 0.0% 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% 0.1 1 10 100 1000 LOAD CURRENT (mA) EFFICIENCY (%) VIN = 4.2V VIN = 3.6V VIN = 3V Efficiency vs. Load (VOUT = 1V) 0.0% 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 0.1 1 10 100 1000 LOAD CURRENT (mA) EFFICIENCY (%) VIN = 3V VIN = 4.2V VIN = 3.6V Efficiency vs. Load (VOUT = 1.2V) 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% EFFICIENCY (%) Quiescent Current vs. Input Voltage (Not Switching) INPUT VOLTAGE (V) INPUT CURRENT (µA) VIN = 3V VIN = 4.2V VIN = 3.6V 0.0% 0.1 1 10 100 1000 LOAD CURRENT (mA) Output Voltage vs. Input Voltage 1.7 1.725 1.75 1.775 1.8 1.825 1.85 1.875 1.9 VOUT (V) 2 . 533 . 544 . 555 . 56 VIN (V) IOUT = 120mA IOUT = 20mA Quiescent Current vs. Temperature (Not Switching) -60 -40 -20 0 20 40 60 80 100 120 140 160 TEMPERATURE (°C) INPUT CURRENT (µA) Output Voltage vs. Output Current 1.7 1.725 1.75 1.775 1.8 1.825 1.85 1.875 1.9 1 10 100 1000 IOUT (mA) VOUT (V) VIN = 4.2V VIN = 3V VIN = 3.6V

Micrel Inc. MIC33030 Typical Characteristics (Continued) February 2011 5 M9999-020311-C Output Voltage vs. Temperature 1.7 1.725 1.75 1.775 1.8 1.825 1.85 1.875 1.9 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) OUTPUT VOLTAGE (V) Switching Frequency vs. Temperature 4.5 5.5 6.5 7.5 SWITCHING FREQUENCY (MHz) -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) IOUT = 120mA Switching Frequency vs. Load Current 0.1 100 1000 10000 SWITCHING FREQUENCY (kHz) VIN = 3.6V VIN = 4.2VVIN = 3V 0.01 0.001 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) Enable (ON) Voltage vs. Input Voltage 0.2 0.4 0.6 0.8 1.2 ENABLE VOLTAGE (V) 2 . 533 . 544 . 555 . 56 INPUT VOLTAGE (V) Enable Voltage vs. Temperature 0.2 0.4 0.6 0.8 1.2 - 6 0 - 4 0 - 2 0 0 2 04 06 08 0 1 0 0 1 2 0 1 4 0 TEMPERATURE (°C) ENABLE VOLTAGE (V) VIN = 5.5V VIN = 4.2V VIN = 3.6V VIN = 2.7V Current Limit vs. Input Voltage 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 2 2.5 3 3.5 4 4.5 5 5.5 6 VIN (V) CURRENT LIMIT (A)

Micrel Inc. MIC33030 Functional Characteristics February 2011 6 M9999-020311-C

Micrel Inc. MIC33030 February 2011 7 M9999-020311-C Functional Characteristics (Continued)

Micrel Inc. MIC33030 February 2011 8 M9999-020311-C Functional Characteristics (Continued)

Micrel Inc. MIC33030 February 2011 9 M9999-020311-C Functional Diagram Simplified MIC33030 Fixed Functional Block Diagram Simplified MIC33030 Adjustable Functional Block Diagram

leave the enable pin floating. routed in most applications. output filter capacitor to this pin. Figure 1. MIC33030-AYHJ Schematic from the analog ground (AGND) loop as applicable. Refer to the layout recommendations for more details.

Micrel Inc. MIC33030 February 2011 12 M9999-020311-C The DCR losses can be calculated as follows: PDCR = IOUT 2 x DCR From that, the loss in efficiency due to inductor resistance can be calculated as follows: 100P I V I V1 LossEfficiency DCROUTOUT OUTOUT × + × ×− = Efficiency loss due to DCR is minimal at light loads and gains significance as the load is increased. Inductor selection becomes a trade-off between efficiency and size in this case. The effect of MOSFET voltage drops and DCR losses in conjunction with the maximum duty cycle combine to limit maximum output voltage for a given input voltage. The following graph shows this relationship based on the typical resistive losses in the MIC33030: HyperLight Load™ Mode MIC33030 uses a minimum on and off time proprietary control loop (patented by Micrel). When the output voltage falls below the regulation threshold, the error comparator begins a switching cycle that turns the PMOS on and keeps it on for the duration of the minimum-on-time. This increases the output voltage. If the output voltage is over t he regulation threshold, then the error comparator turns the PMOS off for a minimum- off-time until the output drops below the threshold. The NMOS acts as an ideal rect ifier that conducts when the PMOS is off. Using a NMOS switch instead of a diode allows for lower voltage drop across the switching device when it is on. The asynchronous switching combination between the PMOS and the NMOS allows the control loop to work in discontinuous mode for light load operations. In discontinuous mode, the MIC33030 works in pulse frequency modulation (PFM) to regulate the output. As the output current increases, the off-time decreases, thus provides more energy to the output. This switching scheme improves the efficiency of MIC33030 during light load currents by only switching when it is needed. As the load current increases, the MIC33030 goes into continuous conduction mode (CCM) and switches at a frequency centered at 8MHz. The equation to calculate the load when the MIC33030 goes into continuous conduction mode may be approximated by the following formula: × −> f L D V VI OUTIN LOAD 2 As shown in the above equation, the load at which MIC33030 transitions from HyperLight Load™ mode to PWM mode is a function of the input voltage (VIN), output voltage (V OUT), duty cycle (D), inductance (L) and frequency (f). Since the inductance of MIC33030 is 0.36μH, the device will enter HyperLight Load™ mode or PWM mode at approximately 150mA.

Micrel Inc. MIC33030 February 2011 13 M9999-020311-C Power Dissipation Considerations As with all power devices, the ultimate current rating of the output is limited by the thermal properties of the package and the PCB it is mounted on. There is a simple, ohms law type relationship between thermal resistance, power dissipation and temperature which are analogous to an electrical circuit: From this simple circuit we can calculate Vx if we know Isource, Vz and the resistor values, Rxy and Ryz using the equation: () Vz Ryz RxyIsourceVx + + ⋅ = Thermal circuits can be considered using these same rules and can be drawn similarly replacing current sources with Power dissipation (in Watts), Resistance with Thermal Resistance (in ºC/W) and Voltage sources with temperature (in ºC): Now replacing the variables in the equation for Vx, we can find the junction temperature (T J) from power dissipation, ambient temperature and the known thermal resistance of the PCB (RθCA) and the package (RθJC): () CAJCDISSJ R R P T+ ⋅ = AMBT+θθ As can be seen in the diagram, total thermal resistance RθJA = RθJC + RθCA. Hence this can also be written: () AMBJADISSJ T R P T+ ⋅ =θ Since effectively all of the power loss in the converter is dissipated within the MIC33030 package, P DISS can be calculated thus: ) (11P POUTDISS − ⋅ =η Where η = Efficiency taken from efficiency curves RθJC and RθJA are found in the operating ratings section of the datasheet. Example: A MIC33030 is intended to drive a 300mA load at 1.8V and is placed on a printed circuit board which has a ground plane area of at least 25mm square. The Voltage source is a Li-ion battery with a lower operating threshold of 3V and the ambient temperature of the assembly can be up to 50 ºC. Summary of variables: IOUT = 0.3A VOUT = 1.8V VIN = 3V to 4.2V TAMB = 50ºC RθJA = 76ºC/W from Datasheet η @ 300mA = 75% (worst case with V IN=4.2V from the Typical Characteristics Efficiency vs. Load graphs) ).( . . 175 0 13 0 8 1 PDISS − ⋅ ⋅ = = 0.18W The worst case switch and inductor resistance will increase at higher temperatures, so a margin of 20% can be added to account for this: P DISS = 0.18 x 1.2 = .216W Therefore: T J = 0.216W. (76 ºC/W) + 50ºC TJ = 66ºC This is well below the maximum 125 ºC.

Micrel Inc. MIC33030 February 2011 14 M9999-020311-C MIC33030 Typical Application Circuit (Fixed) Bill of Materials Item Part Number Manufacturer Description Qty. C1, C2 C1608X5R0J475K TDK(1) 4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603 2 R1 CRCW06031002FKEA Vishay(2) Resistor, 10k, Size 0603 1 U1 MIC33030-xYHJ Micrel, Inc.(3) 8MHz 400mA Integrated Inductor Buck Regulator with HyperLight Load™ 1 Notes: 1. TDK: www.tdk.com. 2. Vishay: www.vishay.com.

Micrel Inc. MIC33030 February 2011 15 M9999-020311-C MIC33030 Typical Application Circuit (Adjustable 1.8V) Bill of Materials Item Part Number Manufacturer Description Qty. C1, C2 C1608X5R0J475K TDK(1) 4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603 2 R1 CRCW06031002FT1 Vishay(2) 10k Ω, 1%, Size 0603 1 R2 CRCW06033013FT1 Vishay(2) 301k Ω, 1%, Size 0603 1 R3 CRCW06031583FT1 Vishay(2) 158k Ω, 1%, Size 0603 1 U1 MIC33030-AYHJ Micrel, Inc.(3) 8MHz 400mA Integrated Inductor Buck Regulator with HyperLight Load™ 1 Notes: 1. TDK: www.tdk.com. 2. Vishay: www.vishay.com.

Micrel Inc. MIC33030 February 2011 16 M9999-020311-C PCB Layout Recommendations Fixed Top Layer Fixed Bottom Layer

Micrel Inc. MIC33030

Package Information

10-Pin (2.5mm x 2.0mm) MLF® (HJ) February 2011 17 M9999-020311-C

Micrel Inc. MIC33030 February 2011 18 M9999-020311-C Recommended Landing Pattern 10-Pin 2.5mm x 2mm MLF® All dimensions in mm. Tolerance /- 0.05mm unless noted otherwise. The red circle indicates a Thermal Via. The Size should be .300-.350 mm in diameter and it should be connected to GND plane for maximum thermal performance. Magenta colored pads: Indicate different potential; DO NOT connect to GND plane. 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 Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical impla 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. can nt © 2010 Micrel, Incorporated.