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Technical content

Features

  • Integrated MOSFETs and inductor
  • 100% duty cycle
  • 4MHz PWM operation in continuous mode
  • 1A output current
  • Low output voltage ripple
  • 85% typical efficiency at 1mA, up to 93% peak efficiency
  • Ultra-fast transient response
  • Advanced copper lead frame design provides superior thermal performance
  • Low-radiated emission (EMI) per EN55022, class B
  • Adjustable output voltage 0.7V to 5V
  • Thermal-shutdown and current-limit protection
  • Configurable soft-start with pre-bias start-up capability
  • Auto discharge of 180Ω (MIC33164 only)
  • Low profile 2.5mm × 3.0mm ×1.1mm QFN packages
  • 0.1µA shutdown current
  • 33µA quiescent current

Applications

  • 5V point-of-load (POL)
  • Low-voltage distributed power systems
  • Space-constrained applications
  • Portable devices
  • SSD storage systems
  • Digital cameras Typical Application 100 10 100 1000 EFFICIENCY (%) OUTPUT CURRENT(mA) Efficiency vs. Output Current VIN = 5V VOUT = 1.8V VOUT = 2.5V VOUT =3.3V HyperLight Load is a registered trademark of Micrel, 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 May 22, 2014 Revision 1.1

Micrel, Inc. MIC33163/4

Ordering Information

Discharge Junction Temperature Range Package(1, 2) MIC33163YGJ ADJ No –40°C to +125°C 20-Pin 2.5mm × 3mm QFN MIC33164YGJ ADJ Yes –40°C to +125°C 20-Pin 2.5mm × 3mm QFN Note: 1. QFN is a GREEN, RoHS-compliant package. Mold compound is Halogen Free. 2. Pb-Free Lead finish is Matte Tin. Pin Configuration 2.5mm × 3mm QFN (GJ) Adjustable Output Voltage (Top View) Pin Description Pin Number Pin Name Pin Function 1, 20 PVIN Power Input Voltage: Connect a capacitor to PGND to decouple the noise. 2, 8, 9 PGND Power Ground. 3, 4, 5, 6, 7 SW Switch (Output): Internal power MOSFET output switches. Disable pull-down 180Ω (MIC33164 only). 10,11,12,13 VOUT Inductor Output. Connect a capacitor to PGND to filter the switcher output voltage

14 AGND Analog Ground: Connect to central ground point where all high current paths meet (CIN, COUT,

PGND) for best operation. 15 AVIN Analog Input Voltage: Connect a capacitor to ground to decouple the noise. 16 SS Soft-Start: Place a capacitor from SS pin to ground to program the soft start time. 17 PG Power Good: Open Drain output for the power good indicator. Place a resistor between this pin and a voltage source to detect a power good condition. 18 FB Feedback: Connect a resistor divider from VOUT to AGND to set the output voltage. 19 EN Enable (Input): Logic high enables operation of the regulator. Logic low will shut down the device. Do not leave floating. May 22, 2014 2 Revision 1.1

Micrel, Inc. MIC33163/4 Absolute Maximum Ratings(3) Operating Ratings(4) Enable Input Voltage (VEN) .. ……………………….0V to V IN Junction Temperature Range (TJ) . …. −40°C ≤ TJ ≤ +125°C Thermal Resistance Electrical Characteristics(6) TA = 25°C VIN =VEN = 3.6V; COUT = 22µF unless otherwise specified. Bold values indicate –40°C ≤ TJ ≤ +125°C, unless otherwise noted. Parameter Condition Min. Typ. Max. Units Supply Voltage Range 2.7 5.5 V Undervoltage Lockout Threshold (Turn-On) 2.40 2.53 2.65 V Undervoltage Lockout Hysteresis 75 mV Quiescent Current IOUT = 0mA , VSNS > 1.2 × VOUT Nominal 33 55 µA Shutdown Current VEN = 0V; VIN = 5.5V 0.1 2 µA Output Voltage Accuracy VIN = 3.6V if VOUTNOM < 2.5V, ILOAD = 20mA −2.5 +2.5 % VIN = 5.5V if VOUTNOM ≥ 2.5V, ILOAD = 20mA Feedback Regulation Voltage 0.682 0.7 0.717 V Current Limit VSNS = 0.9 × VOUTNOM 2.5 3.3 A Output Voltage Line Regulation VIN = 3.6V to 5.5V, ILOAD = 20mA 0.3 %/V Output Voltage Load Regulation 20mA ≤ ILOAD ≤ 1A, VIN = 3.6V 0.3 20mA ≤ ILOAD ≤ 1A, VIN = 5.5V 0.3 PWM Switch ON-Resistance ISW = 100mA PMOS 0.13 Ω ISW = −100mA NMOS 0.13 Ω Switching Frequency IOUT = 120mA 4 MHz Soft-Start Time VOUT = 90%, CSS = 1nF 1000 µs Soft-Start Current VSS = 0V 2.2 µA Power Good Threshold (Rising) % of VNOM 85 90 95 % Notes: 3. Exceeding the absolute maximum ratings may damage the device. 4. The device is not guaranteed to function outside its operating ratings. 6. Specification for packaged product only. May 22, 2014 3 Revision 1.1

Micrel, Inc. MIC33163/4 Electrical Characteristics(6) (Continued) TA = 25°C; VIN =VEN = 3.6V; COUT = 22µF unless otherwise specified. Bold values indicate –40°C ≤ TJ ≤ +125°C, unless otherwise noted. Parameter Condition Min. Typ. Max. Units Power Good Threshold Hysteresis 7 % Power Good Pull-Down VSNS = 90% VNOMINAL, IPG = 1mA 60 200 mV Enable Threshold Turn-On 0.5 0.8 1.2 V Enable Hysteresis 70 mV Enable Input Current 0.1 2 µA Overtemperature Shutdown 160 °C Overtemperature Shutdown Hysteresis 20 °C SW Pull-Down Resistance (MIC33164 only) VEN = 0V 180 Ω May 22, 2014 4 Revision 1.1

Micrel, Inc. MIC33163/4 Typical Characteristics 100 10 100 1000 EFFICENCY (%) OUTPUT CURRENT(mA) Efficiency vs. Output Current VOUT = 1.2V VIN = 3.3V VOUT = 2.5V VOUT = 1.8V 100 10 100 1000 EFFICIENCY (%) OUTPUT CURRENT(mA) Efficiency vs. Output Current VIN = 5V VOUT = 1.8V VOUT = 2.5V VOUT = 3.3V VOUT = 1.2V 100 1000 10000 100000 1000000 100 1000 10000 100000 1000000 RISE TIME (µs) CSS (pF) VOUT Rise Time vs. CSS VIN = 3.6V 2.6 2.8 3.2 3.4 3.6 3.8 2.5 3 3.5 4 4.5 5 5.5 CURRENT LIMIT (A) INPUT VOLTAGE (V) Current Limit vs. Input Voltage 1.75 1.752 1.754 1.756 1.758 1.76 1.762 1.764 1.766 1.768 1.77 2.5 3 3.5 4 4.5 5 5.5 OUTPUT VOLTAGE (V) INPUT VOLATGE (V) Line Regulation (High Loads) 200mA500mA 100 200 300 400 500 600 700 800 900 1000 1100 20 40 60 80 100 120 MAX OUTPUT CURRENT (mA) AMBIENT TEMPERATURE(°C) Max. Output Current vs. Temperature VIN = 5V VOUT = 1.8V VIN =3.3V May 22, 2014 5 Revision 1.1

Micrel, Inc. MIC33163/4 Typical Characteristics (Continued) 1.72 1.73 1.74 1.75 1.76 1.77 1.78 0 20 40 60 80 100 120 140 OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) Output Voltage vs. Output Current (DCM) VIN = 3.6V 1.72 1.73 1.74 1.75 1.76 1.77 1.78 100 200 300 400 500 600 700 800 900 1000 OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) Output Voltage vs. Output Current (CCM) VIN = 3.6V 1.65 1.67 1.69 1.71 1.73 1.75 1.77 1.79 1.81 1.83 1.85 -40 -20 0 20 40 60 80 100 OUTPUT VOLTAGE (V) TEMPERATURE (°C) Output Voltage vs. Temperature VIN = 3.6V 2.5 3 3.5 4 4.5 5 5.5 PG THRESHOLD (% of VREF) INPUT VOLTAGE (V) PG Threshold vs. Input Voltage PG RISING PG FALLING 2.44 2.46 2.48 2.5 2.52 2.54 2.56 2.58 2.6 -40 -20 0 20 40 60 80 100 UVLO THRESHOLD (V) TEMPERATURE (°C) UVLO Threshold vs. Temperature UVLO ON UVLO OFF 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 2.5 3 3.5 4 4.5 5 5.5 ENABLE VOLTAGE (V) INPUT VOLTAGE (V) Enable Thresholds vs. Input Voltage CFF = 1nF TCASE = 25°C VOUT = 2V 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 -40 -20 0 20 40 60 80 100 ENABLE THRESHOLD (V) TEMPERATURE (°C) Enable Threshold vs. Temperature VIN = 3.6V 100 1000 10000 1 10 100 1000 FREQUENCY (KHz) OUTPUT CURRENT (mA) Switching Frequency vs. Output Current VIN = 3.6V VIN = 5V 0.68 0.685 0.69 0.695 0.7 0.705 0.71 0.715 0.72 -40 -20 0 20 40 60 80 100 FEEDBACK VOLTAGE (V) TEMPERATURE (°C) Feedback Voltage vs. Temperature VIN =3.6V VOUT = 1.75V IOUT = 30mA May 22, 2014 6 Revision 1.1

Micrel, Inc. MIC33163/4 Typical Characteristics (Continued) 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 -40 -20 0 20 40 60 80 100 120 Shutdown Current (µA) Temperature (°C) Shutdown Current vs. Temperature VIN = 3.6V May 22, 2014 7 Revision 1.1

Micrel, Inc. MIC33163/4 Functional Characteristics May 22, 2014 8 Revision 1.1

Micrel, Inc. MIC33163/4 Functional Characteristics (Continued) May 22, 2014 9 Revision 1.1

Micrel, Inc. MIC33163/4 Functional Characteristics (Continued) May 22, 2014 10 Revision 1.1

Figure 1. Simplified MIC33163/4 Functional Block Diagram − Adjustable Output Voltage

Micrel, Inc. MIC33163/4 Functional Description PVIN The input supply ( PVIN) provides power to the internal MOSFETs for the switch- mode regulator . The PV IN operating input voltage range of 2.7V to 5.5V so an input capacitor, with a minimum voltage rating of 6.3V, is recommended. Due to the high switching speed, a minimum 2.2µF bypass capacitor placed close to PVIN and the power ground (PGND) pin is required . Refer to the PCB Layout Recommendations section for details. AVIN Analog VIN (AVIN) provides power to the internal control and analog supply circuitry. AVIN must be tied to PVIN. Careful layout should be considered to ensure that any high-frequency switching noise caused by PVIN is reduced before reaching AVIN. A 1µF capacitor as close as to AVIN as possible is recommended. Refer to the PCB Layout Recommendations section for details. EN/Shutdown A logic high signal on the enable pin activates the output voltage of the device. A logic low signal on the enable pin deactivates the output and reduces supply current to 0.1µA. When disabled the MIC33164 switches an internal load of 180Ω on the regulators switch node to discharge the output. The MIC 33163/4 features external soft -start circuitry adjusted by the soft start (SS) pin, which reduces in-rush current and prevents the output voltage from overshooting at start up. Do not leave the EN pin floating. SW The switch (SW) connects to the controller end of integrated inductor. The other end of the inductor is connected to VOUT pin. Due to the high- speed switching on this pin, the switch node should be not be connected. VOUT The output pin (VOUT) connects to the output of integrated inductor. The output capacitor should be connected from this pin to PGND as close to the module as possible. The MIC33163/4 is rated for an output current of up to 1A. A 22µF capacitor is recommended for best performance. Refer to the PCB Layout Recommendations section for details. AGND The analog ground (AGND) is the ground path for the biasing and control circuitry. The current loop for the signal ground should be separate from the power ground (PGND) loop. Refer to the PCB Layout Recommendations section for details. PGND The power ground (PGND) pin is the ground path for the high current in PWM mode. The current loop for the power ground should be as small as possible and separate from the analog ground (AGND) loop as applicable. Refer to the PCB Layout Recommendations section for details. PG The power good (PG) pin is an open drain output which indicates logic high when the output voltage is typically above 90% of its steady state voltage. A pull -up resistor of more than 5kΩ should be connected from PG to VOUT. SS The soft -start (SS) pin is used to control the output voltage ramp-up time. Setting CSS to 1nF sets the start-up time to the recommended minimum of approximately 575µs. The start -up time can be determined by Equation SS SS C)10ln(10250T ×××= Eq. 1 The action of the soft -start capacitor is to control the rise time of the internal reference voltage between 0% and 100% of its nominal steady state value. FB This is the control input for programming the output voltage. A resistor divider network is connected to this pin from the output and is compared to the internal 0.7V reference within the regulation loop. May 22, 2014 12 Revision 1.1

R1 is the top resistor, R2 is the bottom resistor. Table 1. Example Feedback Resistor Values

improves efficiency by reducing DC losses in the device. output current is over 220mA. Figure 3. SW Frequency vs. Output Current are shown in the Functional Characteristic. The limit on the graph is per EN55022 class B standard.

Micrel, Inc. MIC33163/4 Typical Application Circuit Bill of Materials Item Part Number Manufacturer Description Qty. C1608X5R1A475K080AC TDK(7) 4.7µF, 10V, X5R, Size 0603 1 GRM188R60J475KE19D Murata(8) C2 C1608X5R1A105K TDK 1µF, 10V, X5R, Size 0603 1 C3 C1005C0G1H102J050BA TDK 1nF, 50V, 0402 1 C1005C0G1H150J050BA TDK 15pF, 50V, 0402 1 GRM1555C1H150JZ01D Murata C5 C1608X5R1A226M080AC TDK 22µF,10V, X5R, Size 0603 1 R1 CRCW0402301KFKEA Vishay(9) 301kΩ, 1%, 1/16W, Size 0402 1 R2 CRCW0402158K0FKEA Vishay 158kΩ, 1%, 1/16W, Size 0402 1 R3, R4 CRCW0402100KFKEA Vishay 100kΩ, 1%, 1/16W, Size 0402 1 R5 CRCW040249R9FKED Vishay 49.9Ω, 1%, 1/16W, Size 0402 1 MIC33163YGJ Micrel, Inc.(10) 4MHz, 1A, 100% Duty Cycle Buck Regulator with Integrated Inductor and HyperLight Load 1 MIC33164YGJ Notes: 7. TDK: www.tdk.com. 8. Murata: www.murata.com. 9. Vishay: www.vishay.com. May 22, 2014 16 Revision 1.1

Micrel, Inc. MIC33163/4 PCB Layout Recommendations Top Bottom May 22, 2014 17 Revision 1.1

Micrel, Inc. MIC33163/4 Package Information and Recommended Landing Pattern(11) 20-Pin 2.5mm × 3mm QFN (GJ) Note: May 22, 2014 18 Revision 1.1

Micrel, Inc. MIC33163/4 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 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. © 2014 Micrel, Incorporated. May 22, 2014 19 Revision 1.1