MC34726AFCR2

Freescale Semiconductor Advance Information Document Number: MC34726 Rev. 2.0, 1/2014 The 34726 is a high efficiency, low quiescent current (IQ), synchronous buck regulator, implementing Freescale’s innovative Z-mode architecture. Freescale’s Z-mode architecture greatly improves the ripple performance during light load currents, but still maintains a low quiescent current of 65μA, at no load in “Sleepy” Z-mode. The 34726 accepts an input voltage in the range of 2.7 to 5.5 V, making it ideally suited for single cell Li-Ion based applications. Factory preset output voltages, ranging from 0.8 to 3.3 V, reduce the number of required auxiliary components. The part is able to provide 300 mA of continuous load current across the input and the output voltage ranges. The 34726 switches at 2.0 MHz to allow the use of small, surface mount inductors and capacitors to save precious board space. The 34726 is available in the small, space saving, and low cost, 2x2 UDFN-8 packages. The part is guaranteed for operation over the -25°C to 85°C temperature range. Features • 94% peak efficiency • 2.0 MHz switching frequency • 2.7 to 5.5 V input voltage range • Automatic transition to energy saving light load Z-mode (low ripple) • Fixed output voltage options from 0.8 to 3.3 V • 65 μA quiescent current during sleepy Z-mode • 300 mA maximum continuous output current • Internal 2.0 ms soft start • Thermal and over-current protection • 0.1 μA quiescent current in shutdown (disabled) • Ultra thin 2x2 UDFN package • Pb-free packaging designated by suffix code FC 34726 2.7 ~ 5.5V VIN 34726 POWER MANAGEMENT IC Bottom View FC SUFFIX (PB-FREE) 98ASA10787D 8-PIN UDFN 2X2 ORDERING INFORMATION Device Temperature Range (TA) Package Refer to Table 1, Device Variations -25°C to 85°C 8-UDFN L1 0.8 - 3.3V * 300mA SW CIN FB COUT EN ON OFF GND Figure 1. 34726 Typical Operating Circuit * This document contains certain information on a new product. Specifications and information herein are subject to change without notice. © Freescale Semiconductor, Inc., 2008-2010. All rights reserved. *Programmable See table 1 ARCHIVE INFORMATION ARCHIVE INFORMATION 300 mA High Efficiency Low Quiescent Current Synchronous Buck Regulator With Z-mode DEVICE VARIATIONS DEVICE VARIATIONS Table 1. Device Variations Freescale Part No. VIN Range Output Voltage(1) Maximum Load Current Switch Frequency (MHz)(2) MC34726AFC 2.7 - 5.5 V 1.2 V 300 mA 2.0 MC34726BFC 2.7 - 5.5 V 1.8 V 300 mA 2.0 MC34726CFC 3.6 - 5.5 V 3.3 V 300 mA 2.0 MC34726DFC 2.7 - 5.5 V 1.5 V 300 mA 2.0 MC34726EFC 2.7 - 5.5 V 2.5 V 300 mA (3) 2.0 Notes 1. Output voltages of: 0.8 V, 0.9 V, 1.0 V, 1.1 V, 1.3 V, 1.4 V, 1.85 V, 2.0 V options available on request. Contact Freescale sales. 2. Factory programmable at 2.0 MHz or 4.0 Mhz. Contact Freescale sales for availability of the 4.0 MHz functionality. 3. The minimum input voltage must be higher than 2.8 V for 300 mA of load current. 34726 2 Analog Integrated Circuit Device Data Freescale Semiconductor INTERNAL BLOCK DIAGRAM INTERNAL BLOCK DIAGRAM EN VIN Osc. Internal Regulator – + FB Ref. VIN + – Buck Controller Thermal Shutdown SW (2) Current Limit PWM Ref. – + UVLO Soft Start NC GND (2) Figure 2. 34726 Simplified Internal Block Diagram 34726 Analog Integrated Circuit Device Data Freescale Semiconductor 3 PIN CONNECTIONS PIN CONNECTIONS Transparent Top View VIN 1 8 SW GND 2 7 SW GND 3 6 NC EN 4 5 FB 2x2 UDFN-8 (Non EP) Figure 3. 34726 Pin Connections Table 2. 34726 Pin Definitions A functional description of each pin can be found in the Functional Pin Description section beginning on page 10. Pin Number Pin Name Pin Function Formal Name Definition 1 VIN Input Supply Voltage Input 2 GND Ground Ground Ground 3 GND Ground Ground Low noise ground 4 EN Input Enable Active high enable input 5 FB Input Feedback Input Feedback of the output voltage 6 NC N/A No Connection Internally not connected. Connect to GND externally 7 SW Output Switching Node This terminal connects to the output inductor 8 SW Output Switching Node This terminal connects to the output inductor Power input 34726 4 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS Table 3. Maximum Ratings All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or permanent damage to the device. Ratings Symbol Value Unit All pins voltages VIN, VEN, VFB, VSW -0.3 to 6.0 V ESD Voltage(1) VESD ELECTRICAL RATINGS V Human Body Model (HBM) ±2000 Machine Model (MM) ±200 THERMAL RATINGS Operating Ambient Temperature Range TA -25 to +85 °C Storage Temperature Range TSTG -25 to +150 °C Maximum Lead Temperature(2),(3) TPPRT Note 3 °C Junction Temperature °C TJ Operating Junction Temperature 125 Maximum Junction Temperature +150 Thermal Resistance(4) °C/W Junction-to-Case RθJC 104 Junction-to-Ambient RθJA 122 Power Dissipation Continuous (Derate 3.0 mW/°C and over TA = 70°C) W PD 0.5 Notes 1. ESD testing is performed in accordance with the Human Body Model (HBM) (CZAP = 100 pF, RZAP = 1500 Ω), and the Machine Model (MM) (CZAP = 200 pF, RZAP = 0 Ω). 2. 3. 4. Pin soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may cause malfunction or permanent damage to the device. Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow Temperature and Moisture Sensitivity Levels (MSL). Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes and enter the core ID to view all orderable parts. (i.e. MC33xxxD enter 33xxx), and review parametrics. Device mounted on the Freescale EVB test board per JEDEC DESD51-2. 34726 Analog Integrated Circuit Device Data Freescale Semiconductor 5 ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 4. Static Electrical Characteristics Characteristics noted under conditions; 2.7 V ≤ VIN ≤ 5.5 V, 0.8 V ≤ VOUT ≤ 3.3 V, -25oC ≤ TA ≤ 85oC, CIN = COUT = 4.7 μF, L1 = 4.7 μH (See Figure 1), unless otherwise noted. The typical specifications are measured at the following conditions; TA = +25oC, VIN = 3.6 V, fSW = 2.0 MHz with the typical operating circuit (See Figure 1), unless otherwise noted. Characteristic Symbol Min Typ Max Unit VIN 2.7 - 5.5 V Output Voltage (Factory preset) VOUT 0.8 - 3.3 V Output Current IOUT 300 - - mA Supply Voltage Total Supply Current (5) Quiescent Current (Switching) 1.0 - 65 85 - 450 - μA mA ΔVOUT Overload and temperature UVLO Threshold(6) 0.1 IPK Current rising at high side Output Voltage Accuracy (% of output voltage) IQ Sleepy Z-mode and ILOAD = 0 mA Current Limit μA IDIS Regulator disabled VOUT -3% - 3% VUVLO V VIN: 2.7 -5.5 V VIN rising - - 2.7 VIN falling 2.5 - - Regulator operating 1.6 - - Regulator shutdown - - 0.4 - 250 - - 350 - - 0.5 - Enable Voltage High Side Power MOSFET On Resistance VEN RDS(ON)H VIN = 3.6 V, VOUT = 1.8 V, TA = 40°C, ILOAD = 150 mA Low Side Power MOSFET On Resistance % ΔVOUT/ΔVIN VIN = 2.7 to 5.5 V Start-up Overshoot (% of output voltage) mΩ ΔVOUT/ΔIOUT 1.0 mA < ILOAD < 300 mA and VOUT = 1.8 V Line Regulation mΩ RDS(ON)L VIN = 3.6 V, VOUT = 1.8 V, TA = 40°C, ILOAD = 150 mA Load Regulation V % - 0.5 - - 3% - VSTO ILOAD = 0 mA, VOUT = 1.8 V and COUT = 4.7 μF VOUT Thermal Shutdown Threshold (Junction Temperature) TSTDN - 140 - °C Thermal Shutdown Hysteresis (Junction Temperature) THYSTR - 10 - °C Notes 5. Maximum IDIS measured at VIN = 3.6 V and TA = 25°C. 6. For a product with a VOUT of 3.3 V and a VIN minimum less than 3.6 V, the VOUT value will track (drop below 3.3 V) VIN down to a value of 2.5 V, where the UVLO shutdown mechanism will activate. 34726 6 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS Table 5. Dynamic Electrical Characteristics Characteristics noted under conditions; 2.7 V ≤ VIN ≤5.5 V, 0.8 V ≤ VOUT ≤3.3 V, -20oC ≤ TA ≤ 85oC, CIN = COUT = 4.7 μF, L1 = 4.7 μH (See Figure 1), unless otherwise noted. The typical specifications are measured at the following conditions; TA = +25oC, VIN = 3.6 V, fSW = 2.0 MHz with the typical operating circuit (See Figure 1), unless otherwise noted. Characteristic Switching Frequency Symbol Min Typ Max Unit (7) fSW 1.8 2.0 2.2 MHz (8) DMAX Maximum Duty Cycle Measured from SW pin Internal Soft-start Timer % 95 - 100 - 2.0 - tS VOUT Rise Time ms Notes 7. fSW can be factory programmed to ±20% of nominal 2.0 MHz. 8. The maximum duty limits the range of output voltages achievable for a given input voltage. 34726 Analog Integrated Circuit Device Data Freescale Semiconductor 7 ELECTRICAL CHARACTERISTICS ELECTRICAL PERFORMANCE CURVES ELECTRICAL PERFORMANCE CURVES VEN (10 V/DIV) 100 Efficiency (%) Time: 500 μs/DIV 80 60 40 20 VIN=2.7V VIN=3.6V VIN=5.5V 0 0.1 1 IL (200 mA/DIV) 10 ILOAD (mA) 100 1000 Figure 4. Efficiency vs. Load Current VIN = 3.6 V, VOUT = 1.8 V, TA=25oC 1.00 Line Regulation (%) VOUT (200 mV/DIV) 0.75 Figure 7. Start-up Response ILOAD = 0 mA, VOUT=1.2 V Time: 100 μs/DIV ILOAD=0mA ILOAD=100mA ILOAD=300mA VOUT (1.0 V/DIV) VSW (2.0 V/DIV) 0.50 0.25 0.00 -0.25 2.5 3.0 3.5 4.0 4.5 5.0 IL (200 mA/DIV) 5.5 VIN (V) Figure 5. Line Regulation VIN is 2.7 V to 5.5 V and VOUT is 1.8 V, TA=25oC Time: 5.0 μs/DIV 0.75 Load Regulation (%) Figure 8. Sleepy Z-ModeTM Switching Waveforms VIN = 3.6 V, VOUT = 1.8 V and ILOAD = 1.0 mA 0.50 VOUT (1.0 V/DIV) VSW (2.0 V/DIV) 0.25 0.00 -0.25 0 VIN=2.7V VIN=3.6V VIN=5.5V 50 100 150 200 250 300 IL (200 mA/DIV) ILOAD (mA) Figure 6. Load Regulation 1.0 mA < ILOAD < 300 mA, VOUT = 1.8 V Figure 9. Z-ModeTM Switching Waveforms VIN = 3.6 V, VOUT = 1.8 V and ILOAD = 10 mA 34726 8 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS ELECTRICAL PERFORMANCE CURVES Time: 500 ns/DIV VOUT (1.0 V/DIV) Time: 200 μs/DIV VSW (2.0 V/DIV) VOUT (AC Coupled, 200 mV/DIV) VSW (2.0 V/DIV) ILOAD (200 mA/DIV) IL (200 mA/DIV) Figure 10. CCM Switching Waveforms VIN = 3.6 V, VOUT = 1.8 V and ILOAD = 150 mA Time: 200 μs/DIV Figure 12. Load Transient in Z-ModeTM VIN = 3.6 V, ILOAD =10 to 300 mA VOUT (AC Coupled, 500 mV/DIV) Time: 200 μs/DIV VSW (2.0 V/DIV) ILOAD (100 mA/DIV) Figure 11. Load Transient in Sleepy Z-ModeTM VIN = 3.6 V, ILOAD =1.0 to 150 mA VOUT (AC Coupled, 50 mV/DIV) VSW (2.0 V/DIV) ILOAD (100 mA/DIV) Figure 13. Load Transient in CCM VIN = 3.6 V, ILOAD = 150 to 300 mA 34726 Analog Integrated Circuit Device Data Freescale Semiconductor 9 FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION The 34726 is a high efficiency, synchronous, buck regulator, utilizing a voltage mode control architecture with feed forward. It is capable of providing a 300 mA load current for output voltages of 0.8 to 3.3 V, from a single input voltage rail between 2.7 and 5.5 V. In a buck converter, most of the losses at high output loads are due to conduction losses in the power train, but at light output loads, the conduction losses are reduced and most of the losses become switching losses. Using Freescale’s Zmode architecture, the 34726, at light output loads, will smoothly transition into a lower switching frequency, thus improving its efficiency. FUNCTIONAL PIN DESCRIPTION SUPPLY VOLTAGE INPUT (VIN) 2.7 to 5.5 V DC power input. Bypass with a 4.7 μF ceramic capacitor as close as possible to the VIN and GND pins. FEEDBACK INPUT (FB) Feedback of the output voltage. SWITCHING NODE (SW) GROUND (GND) Ground. This terminal connects to the output inductor. The node internally connects the drain of both high side MOSFET and low side MOSFET. ENABLE (EN) Active high enable input. EN is over-voltage protected to 6.0 V, independent of the supply voltage. Drive with a logic high signal (or connect to VIN) for normal operation. Drive with a logic low signal, or connect to GND will disable the 34726. NO CONNECTION (NC) Internally not connected. Connect to GND externally. 34726 10 Analog Integrated Circuit Device Data Freescale Semiconductor FUNCTIONAL DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION MC34726 - Functional Block Diagram Integrated Supply Internal Regulator & Reference Oscillator Power MOSFET Control Thermal Shutdown Soft Start Undervoltage Lockout Current Limit Power MOSFET Driver Integrated Supply Oscillator Control MOSFET Figure 14. 34726 Functional Internal Block Diagram INTEGRATED SUPPLY INTERNAL REGULATOR AND REFERENCE The internal regulator and reference block steps down the high input voltage to lower voltage to power all the internal blocks, and provides the reference voltage for the other internal blocks. OSCILLATOR The oscillator block provides 2.0 MHz clock signal to the controller. CONTROLLER THERMAL SHUTDOWN The thermal shutdown block monitors the die temperature. Once the die temperature reaches its threshold, this block turns off the device to prevent the further die temperature rise. SOFT-START The soft-start block controls the output voltage ramp after the device is enabled, to limit the in-rush current. The start-up time is internally set to approximately 2.0 ms, and is independent of input voltage, output voltage, or load current. The soft-start sequence also occurs upon recovery from any fault condition. UVLO The UVLO block monitors the input voltage. Once the input voltage is lower than the falling threshold voltage, this block turns off the device, to avoid unpredictable circuit behavior. CURRENT LIMIT The current limit block monitors the inductor current. When the peak inductor current reaches its current limit, this block turns off the high side MOSFET, to prevent the device and external components from damage. POWER-MOSFET DRIVER The power-MOSFET-driver block controls the phase of the diver signals and enhances the drive capability of these. POWER-MOSFET The power-MOSFET block contains two power MOSFETs. One is a PMOS that passes the current from the input to the output, and the other one is an NMOS that provides the inductor current loop when PMOS is turned off. 34726 Analog Integrated Circuit Device Data Freescale Semiconductor 11 FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES Z-MODE OPERATION The 34726 operates as a typical fixed frequency, PWM regulator, at moderate to heavy load currents. As the load is decreased, such that operation transitions from continuous conduction mode (CCM) to discontinuous conduction mode (DCM), the duty cycle is reduced until it approaches 85% of the full load duty cycle. At this point the 34726 transitions into Z-mode operation, where the Z-mode Factor is 0.85. In Zmode, the regulator skips pulses whenever the duty cycle is below 85% of the CCM duty cycle. As the load decreases, this pulse skipping reduces the switching frequency and the switching losses thus improving efficiency. For example, if a light load demanded a 30% duty cycle at 2.0 MHz, with Zmode this same load will require only (0.3/0.85)2 x 2.0 MHz = 0.249 MHz switching frequency, hence switching losses will be reduced by almost ten fold. Figure 15 illustrates the transition to and the exit from Zmode. VZERR VRAMP PWM PWM_Ref. Z Factor SW On Time Figure 15. Z-mode Operation SLEEPY Z-MODE OPERATION To improve low current efficiency, the 34726 transitions into the Sleepy Z-mode at load currents of approximately 1.0 mA and lower. This is accomplished by powering down internal circuit blocks to lower the device’s quiescent current. Additionally, the oscillator frequency drops to 250 kHz and the low side switch is turned off to emulate the operation of an asynchronous buck converter. DETAILED FUNCTIONAL DEVICE OPERATION OVER-CURRENT PROTECTION SHORT-CIRCUIT PROTECTION The 34726 implements two layers of protection during overload conditions. The first is a current limit feature to prevent the device and external components from damage. When the peak inductor current reaches the over-current limit, nominally 450 mA, the high side MOSFET turns off to provide cycle by cycle protection. If the over-current condition persists and the die temperature surpasses the overtemperature protection (OTP) threshold, this second layer of protection shuts down the device. When a short-circuit condition occurs on the output, typical regulators will tend to operate at maximum duty cycle. This condition can saturate the inductor and produce severe peak currents, resulting in damage to the device. The 34726 avoids this scenario by detecting output voltages below 0.5 V. Upon detection, the part re-starts continuously until the short circuit condition is removed, or the part surpasses its OTP threshold. 34726 12 Analog Integrated Circuit Device Data Freescale Semiconductor FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES OVER-TEMPERATURE PROTECTION To limit its operating temperature, the 34726 shuts down if the junction temperature of the switching MOSFET surpasses 140°C. If the junction temperature subsequently drops to 130°C, the 34726 restarts. SOFT-START OPERATION To limit the in-rush current, an internal timer controls the output voltage ramp after the part is enabled. The start-up time is internally set to approximately 2.0 ms and is independent of input voltage, output voltage, or load current. The soft-start sequence also occurs upon recovery from any fault condition. UNDER-VOLTAGE LOCK-OUT The UVLO threshold is set to 2.7 V for rising VIN, and to 2.5 V for falling VIN. For a VOUT of 3.3 V or 2.5 V, the VOUT value will track VIN below 3.6 V or 2.8 V until the 2.5 V falling VIN threshold is reached. If the UVLO falling threshold is met, the part shuts down and will power-up again with soft-start, when the UVLO rising threshold is surpassed. 34726 Analog Integrated Circuit Device Data Freescale Semiconductor 13 TYPICAL APPLICATIONS APPLICATION INFORMATION TYPICAL APPLICATIONS APPLICATION INFORMATION INPUT CAPACITOR The input capacitor is used to minimize the input voltage transient that may cause instability when the load transient current is high. Typically a 4.7 μF X5R ceramic capacitor is sufficient for most applications. Depending on the load transient current, a larger capacitance may be required. INDUCTOR SELECTION A 4.7 μH low DC resistance inductor is typically used for the 34726 to guarantee the system stable operation. OUTPUT CAPACITOR For stable operation and low output voltage ripple, an X5R ceramic capacitor of 4.7 μF minimum value is needed. TYPICAL APPLICATIONS 1.2 V OUTPUT DC/DC CONVERTOR Figure 16 shows a typical application using 34726A. CIN and COUT are typically 4.7 μF/X5R ceramic capacitors. L1 is typically a 4.7 μH low DC resistance inductor. The FB connects to the output directly for monitoring the output voltage. Normally, the EN pin connects to the input supply directly to enable the regulator. 34726A 2.7 ~ 5.5 V VIN L1 SW CIN 4.7 μF FB EN ON OFF 4.7 μH 1.2 V 300 mA COUT 4.7 μF GND Figure 16. 1.2 V/300 mA DC/DC Convertor 34726 14 Analog Integrated Circuit Device Data Freescale Semiconductor TYPICAL APPLICATIONS PACKAGE DIMENSIONS PACKAGE DIMENSIONS For the most current package revision, visit www.freescale.com and perform a keyword search using the “98A” listed below. FC SUFFIX 12-PIN 98ASA10787D REVISION A 34726 Analog Integrated Circuit Device Data Freescale Semiconductor 15 TYPICAL APPLICATIONS PACKAGE DIMENSIONS FC SUFFIX 12-PIN 98ASA10787D REVISION A 34726 16 Analog Integrated Circuit Device Data Freescale Semiconductor TYPICAL APPLICATIONS PACKAGE DIMENSIONS FC SUFFIX 12-PIN 98ASA10787D REVISION A 34726 Analog Integrated Circuit Device Data Freescale Semiconductor 17 REVISION HISTORY REVISION HISTORY REVISION DATE DESCRIPTION OF CHANGES 1.0 5/2008 • Initial Release 2.0 9/2009 • • Minor adjustments to the Ordering information and Device Variations Updated to match the current Freescale format and style. 1/2014 • Added archive information 34726 18 Analog Integrated Circuit Device Data Freescale Semiconductor How to Reach Us: Home Page: www.freescale.com Web Support: http://www.freescale.com/support USA/Europe or Locations Not Listed: Freescale Semiconductor, Inc. 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Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc. 2010. All rights reserved. MC34726 Rev. 2.0 1/2014