MIC2225-GMYMT-TR

MIC2225 2MHz 600mA Synchronous Buck Regulator with 300mA LDO General Description Features The Micrel MIC2225 is a dual output regulator featuring a high efficiency 2MHz PWM synchronous buck (step-down) regulator and a 300mA LDO. The MIC2225 is an ultra-low noise, small size, and high efficiency solution for portable power applications, providing core and I/O supply rails for applications like application processors, camera DSPs and multimedia chipsets. In PWM mode, the MIC2225 operates with a constant 2MHz frequency. The MIC2225 switching regulator operates from 2.7V to 5.5V input and features internal power MOSFETs that can supply up to 600mA output current in PWM mode. The MIC2225 is available in the 10-pin 2mm x 2mm Thin MLF® package with a junction operating range from –40°C to +125°C. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. DC-DC Converter • 2.7 to 5.5V supply voltage • 2MHz PWM mode • Output current to 600mA • >95% efficiency • 100% maximum duty cycle • Fixed output voltage option down to 1V • Ultra-fast transient response • Stable with 2.2µF ceramic output capacitor • Fully integrated MOSFET switches • Micropower shutdown (1mA in shutdown) • Thermal shutdown and current limit protection • Pb-free 10-pin 2mm x 2mm Thin MLF® package • –40°C to +125°C junction temperature range LDO • VIN range 2.7V to 5.5V • 300mA output current • Output voltage down to 0.8V • Thermal shutdown protection • Current limit protection Applications • Cellular phones • PDAs • USB peripherals ___________________________________________________________________________________________________________ Typical Application 1.8V Efficiency @ 25°C 100 90 2.7VIN 80 70 60 50 3.6VIN 5.5VIN 40 30 20 10 0 0 0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A) 0.6 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 2008 M9999-022008-D Micrel, Inc. MIC2225 Ordering Information Part Number Marking Code Voltage* Temperature Range Package MIC2225-4KYMT 4TK 1.2V/2.6V –40° to +125°C 10-Pin 2x2 Thin MLF® Pb-Free ® Pb-Free Lead Finish MIC2225-4MYMT 4TM 1.2V/2.8V –40° to +125°C 10-Pin 2x2 Thin MLF MIC2225-4OYMT 4TO 1.2V/2.9V –40° to +125°C 10-Pin 2x2 Thin MLF® Pb-Free –40° to +125°C 10-Pin 2x2 Thin MLF ® Pb-Free ® Pb-Free MIC2225-4SYMT 4TS 1.2V/3.3V MIC2225-G4YMT GT4 1.8V/1.2V –40° to +125°C 10-Pin 2x2 Thin MLF MIC2225-GFYMT GTF 1.8V/1.5V –40° to +125°C 10-Pin 2x2 Thin MLF® Pb-Free –40° to +125°C 10-Pin 2x2 Thin MLF ® Pb-Free 10-Pin 2x2 Thin MLF ® Pb-Free MIC2225-GJYMT MIC2225-GMYMT GTJ GTM 1.8V/2.5V 1.8V/2.8V –40° to +125°C Note: MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Other voltage options available. Please contact Micrel for details. * Refers to nominal output voltage of DC/DC and LDO respectively. Pin Configuration AGND 1 10 PGND LDO 2 9 SW BIAS 3 8 VIN AVIN 4 7 ENLDO FB 5 6 EN 10-Pin 2mm x 2mm Thin MLF® (MT) February 2008 2 M9999-022008-D Micrel, Inc. MIC2225 Pin Description Pin Number Pin Name 1 AGND 2 LDO LDO Output (Output): Connect to a 2.2µF output capacitor. 3 BIAS Internal circuit bias supply. Must be de-coupled to signal ground with a 0.1µF capacitor and should not be loaded. 4 AVIN Analog Supply Voltage (Input): Supply voltage for the analog control circuitry and LDO input power. Requires bypass capacitor to GND. It must be tied to VIN. 5 FB Feedback. Input to the error amplifier. For the Adjustable option, connect to the external resistor divider network to set the output voltage. For fixed output voltage options, connect to VOUT and an internal resistor network sets the output voltage. 6 EN Enable (Input). Logic low will shut down the switching regulator reducing the quiescent current to less than 5µA. 7 ENLDO 8 VIN 9 SW 10 PGND February 2008 Pin Function Analog (signal) Ground. Enable LDO (Input): Logic low will shut down the LDO, reducing the quiescent current to less than 5µA. Supply Voltage (Input): Supply voltage for the internal switches and drivers. Switch (Output): Internal power MOSFET output switches. Power Ground. 3 M9999-022008-D Micrel, Inc. MIC2225 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) .......................................................+6V Output Switch Voltage (VSW) ..........................................+6V Output Switch Current (ISW)..............................................1A Logic Input Voltage (VEN,VLOWQ)........................ –0.3V to VIN Storage Temperature (Ts) .........................–60°C to +150°C ESD Rating(3) .................................................................. 2kV Supply Voltage (VIN)..................................... +2.7V to +5.5V Logic Input Voltage (VEN,VLOWQ)........................ –0.3V to VIN Junction Temperature (TJ) ........................ –40°C to +125°C Junction Thermal Resistance Thin MLF-10L (θJA) ............................................90°C/W Electrical Characteristics DC/DC(4) VEN = VIN = 3.6V, L = 2.2µH; COUTDC/DC = 2.2µF, CLDO = 2.2µF; IOUTDC/DC = 100mA; CBIAS = 0.1µF VENLDO = 0V; TJ = 25°C, bold values indicate –40°C < TJ < +125°C; unless noted. Parameter Condition Min Typ Max UVLO Threshold Rising input voltage during turn-on 2.45 2.55 2.65 UVLO Hysteresis 70 Units V mV Switcher Ground Pin Current ENLDO = 0V, VFB = GND ; IL=0mA 850 1100 µA LDO Ground Pin Current EN = 0V 67 110 µA Ground Pin Current in Shutdown EN +ENLDO = 0V 0.2 5 µA Over-temperature Shutdown 160 °C Over-temperature Shutdown Hysteresis 23 °C Enable Input Voltage Logic Low Logic High Enable Input Current 0.2 V V 1.0 VIL < 0.2V 0.1 1 µA VIH > 1.0V 0.1 1 µA Turn-on Time ILOAD = 5mA 50 Fixed Output Voltages Nominal VOUT tolerance Io=50mA Current Limit in PWM Mode VFB = 0.9*VNOM Output Voltage Line Regulation VIN = 2.7V to 5.5V, ILOAD= 100mA Output Voltage Load Regulation 20mA < ILOAD < 300mA Maximum Duty Cycle VFB ≤ 0.4V PWM Switch ON-Resistance ISW = 150mA; VFB = 0.7VFB_NOM ISW = -150mA; VFB = 1.1VFB_NOM 0.675 +2 +3 % % 0.12 1 % % 0.2 1.5 % 0.95 A 100 % Ω Ω 0.4 0.4 Oscillator Frequency February 2008 –2 –3 µs 1.8 4 2 2.2 MHz M9999-022008-D Micrel, Inc. MIC2225 Electrical Characteristics LDO(4) COUTLDO = 2.2µF, IOUTLDO = 100µA; TJ = 25°C, bold values indicate –40°C < TJ < +125°C; unless noted. Parameter Input Voltage Output Voltage Accuracy Line Regulation Turn-on Time Load Regulation Dropout Voltage, Note 5 Ripple Rejection Current Limit Output Voltage Noise Condition Min Variation from nominal VOUT Variation from nominal VOUT; –40°C to +125°C VIN = VOUT +1V to 5.5V; IOUT = 100µA ILOAD = 300mA IOUT = 100µA to 300mA @ VIN = VOUT + 1 IOUT = 300mA @ VIN = 2.7V f = 1kHz; COUT = 2.2µF f = 20kHz; COUT = 2.2µF VOUT = 0V COUT = 2.2µF, 10Hz to 100kHz Typ 2.7 –2.0 –3.0 0.2 30 0.70 210 43 17 400 470 Max Units 5.5 +2.0 +3.0 V % % % µs % mV dB dB mA µVRMS Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Specification for packaged product only. 5. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value that is initially measured at a 1V differential. For outputs below 2.7V, the dropout voltage is the input-to-output voltage differential with a minimum input voltage of 2.7V. February 2008 5 M9999-022008-D Micrel, Inc. MIC2225 Typical Characteristics (DC-DC) 1.2V Efficiency @ –40°C 100 90 2.7VIN 3.6VIN 80 1.2V Efficiency @ 25°C 100 90 70 60 5.5VIN 50 40 50 40 30 30 20 10 20 10 150 0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A) 0.6 Quiescent Current vs. Input Voltage 0 0 1200 125 1000 100 800 75 600 50 VOUT = 1.2V LOAD = 0 ENLDO = 0V EN = VIN 25 0 2.5 100 90 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5 Turn-On Time vs. Input Voltage 3.6VIN 5.5VIN 0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A) 0.6 Quiescent Current vs. Load Current VOUT = 1.19V VLDO = 2.8V ENLDO = 5V 20 10 3 3.5 4 4.5 5 INPUT VOLTAGE (V) February 2008 5.5 5.5VIN 0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A) 0.6 Enable Threshold vs. Input Voltage 1.0 0.8 0.6 VOUT = 1.2V EN = VIN ENLDO = 0V 30 40 50 60 LOAD CURRENT (mA) Peak Current Limit vs. Input Voltage 0.4 VOUT = 1.19V ENLDO = 5V 0.2 0 2.5 2.9 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5 Frequency vs. Input Voltage 2.7 2.5 2.3 2.1 0.3 0.2 0.1 0 2.5 3.6VIN 1.2 0.5 0.4 40 30 10 0 0 1.4 0.7 0.6 60 50 2.7VIN 40 30 20 200 0 90 80 70 60 50 400 1.0 0.9 0.8 80 70 0 2.5 100 2.7VIN 80 70 60 0 0 1.2V Efficiency @ 70°C 1.9 VOUT = 1.2V EN = ENLDO = VIN 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 6 5.5 VOUT = 1.2V LOAD = 0 ENLDO = VIN 1.7 1.5 2.5 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5 M9999-022008-D Micrel, Inc. MIC2225 Typical Characteristics (LDO) PSRR 70 90 60 80 100mA 78 76 74 72 70 60 40 300mA 30 40 30 20 VIN = 1.7V 10 VOUT = 2.8V COUT = 2.2µF 0 100 1K 10K FREQUENCY (Hz) 100 10 100K 0 0 3.00 2.95 ENLDO = VIN 1 2 3 4 INPUT VOLTAGE (V) 5 Output Voltage vs. Load Current 2.80 2.75 2.75 2.70 1mA 2.65 25 VIN = 3.6V ENLDO = VIN 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Output Voltage vs. Temperature 2.86 2.60 2.55 VIN = 3.6V ENLDO = VIN 2.50 0.025 0.075 0.125 0.175 0.225 0.275 LOAD CURRENT (A) 0.20 0.18 2.84 2.82 Dropout Voltage vs. Load Current 2.70 2.65 2.60 50 40 30 2.76 0.12 0.10 2.74 2.72 0.08 0.06 20 VIN = 3.6V ENLDO = VIN Load = 10mA 2.70 2.68 2.66 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 2.0 1.8 Peak Current Limit vs. Input Voltage 50 45 1.6 40 1.4 1.2 35 30 1.0 0.8 25 20 0.6 15 0.4 0.2 10 5 0 2.5 EN = ENLDO = VIN 3 3.5 4 4.5 5 INPUT VOLTAGE (V) February 2008 5.5 0 2.5 Dropout Voltage vs. Temperature ENLDO = VIN 50mA 0.04 0.02 0 0 VIN = 3.6V ENLDO = VIN Load = 1mA 2.55 2.50 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 0.16 0.14 2.8 2.78 Output Voltage vs. Temperature 3.00 2.85 2.80 100mA VIN = 3.6V 62 ENLDO = VIN 60 0.025 0.075 0.125 0.175 0.225 0.275 LOAD CURRENT (A) 2.95 2.90 2.85 2.90 50mA 50 68 66 64 0mA 20 Quiescent Current vs. Temperature 125 100mA 50 10mA Quiescent Current vs. Load Current 80 60mA 70 50 75 Quiescent Current vs. Input Voltage VIN = 3.6V ENLDO = VIN 0.05 0.1 0.15 0.2 0.25 0.3 LOAD CURRENT (A) Turn-On Time vs. Input Voltage 25mA 10mA 10 1mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 1.4 Enable Threshold vs. Input Voltage 1.2 1.0 0.8 0.6 0.4 0.2 ENLDO = VIN 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 7 5.5 0 2.5 3 LDO = 2.8V 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) M9999-022008-D Micrel, Inc. MIC2225 Typical Characteristics (LDO) continued 3.0 Output Noise Spectral Density VIN = 3.6V VOUT = 3.3V COUT = 2.2µF CBYP = 0.1µF 2.5 2.0 Noise(10Hz–100kHz) = 169µVRMS 1.5 1.0 0.5 0 10 100 1K 10K 100K FREQUENCY (Hz) February 2008 1M 8 M9999-022008-D Micrel, Inc. MIC2225 Functional Characteristics February 2008 9 M9999-022008-D Micrel, Inc. MIC2225 Functional Diagram VIN AVIN P-Channel Current Limit 6 BIAS HSD PWM Control SW VOUT1 Anti-Shoot Through COUT1 LSD N-Channel Current Limit EN ENLDO Enable and Control Logic Bias, UVLO, Thermal Shutdown Soft Start FB EA 1.0V LDO LDO Block LDO Current Limit EA VOUT2 COUT2 1.0V SGND PGND MIC2225 Block Diagram February 2008 10 M9999-022008-D Micrel, Inc. MIC2225 Functional Description BIAS The BIAS pin supplies the power to the internal power to the control and reference circuitry. The bias is powered from AVIN through an internal 6Ω resistor. A small 0.1µF capacitor is recommended for bypassing. VIN VIN provides power to the MOSFETs for the switch mode regulator section, along with the current limiting sensing. Due to the high switching speeds, it is recommended that an 1µF capacitor be placed close to VIN and the power ground (PGND) pin for bypassing. Please refer to layout recommendations. FB The feedback pin (FB) provides the control path to control the output. For fixed output, the controller output is directly connected to the feedback (FB) pin. AVIN Analog VIN (AVIN) provides power to the LDO section and the bias through an internal 6Ω resistor. AVIN and VIN must be tied together. Careful layout should be considered to ensure high frequency switching noise caused by VIN is reduced before reaching AVIN. SW The switch (SW) pin connects directly to the inductor and provides the switching current necessary to operate in PWM mode. Due to the high speed switching on this pin, the switch node should be routed away from sensitive nodes. LDO The LDO pin is the output of the linear regulator and needs to be connected to a 2.2µF output capacitor. PGND Power ground (PGND) is the ground path for the high current PWM mode. The current loop for the power ground should be as small as possible and separate from the Analog ground (AGND) loop. Refer to the layout considerations for more details. EN The enable pin provides a logic level control of the output. In the off state, the supply current of the device is greatly reduced (typically