EP5368QI

EP5368QI ENPIRION | Alldatasheet

Document overview

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Technical content

600mA Synchronous Buck Regulator With Integrated Inductor 3mm x 3mm x 1.1mm Package April 2008 RoHS Compliant Halogen Free Featuring Integrated Inductor Technology Product Highlights

• Integrated Inductor
• 3mm x 3mm x 1.1mm QFN package
• Only two low cost MLCC caps required
• 4 MHz switching frequency
• High efficiency, up to 94%
• Up to 700mA continuous output current
• Wide 2.4V to 5.5V input range
• VOUT Range 0.603V to VIN – 0.4V
• 100% duty cycle capable
• Less than 1 µA standby current
• Low VOUT ripple for RF compatibility
• Short circuit and over current protection
• UVLO and thermal protection
• Stable over entire operating range
• RoHS compliant; MSL 3 260°C reflow Typical Application Circuit VIN VSense Vin VS1 VS2 VS0 EP5368QI 22µF 0805 4.7µF 0603 VOUT Vout GND ENABLE VFB Voltage Select

Figure 1. Typical application circuit. providing the smallest possible solution size. capacitors to make a complete solution. ensures compatibility with RF systems. over the commercial temperature range. space constrained por table applications.

Applications

• Noise sensitive RF applications
• Area constrained applications
• Smart phones and PDAs
• Portable gaming devices
• Personal Media Players
• Advanced Mobile Processors, DSP, IO, Memory, Video, Multimedia Engines

Figure 2. EP5368QI Package Pin-out. PGND: (Pin 2): Power ground. external divider should be connected to AGND. OUT (Pin 7,8): Regulated output voltage. select. VS2=pin10 VS1=pin11, VS0=pin12. ≤ 0.4V. Logic hi gh is defined as V HIGH ≥ 1.4V. voltage select for more detail). to the IC. VIN can range from 2.4V to 5.5V.

Figure 3. Functional block diagram.

©Enpirion 2008 all rights reserved, E&OE 4 www.enpirion.com Absolute Maximum Ratings CAUTION: Absolute Maximum ratings are stre ss ratings only. Functional operation beyond recommended operating conditions is not implied. Stress beyond absolute maximum ratings may cause permanent damage to the device. Exposure to absolute maximum rated conditions for extended periods may affect device reliability. PARAMETER SYMBOL MIN MAX UNITS Input Supply Voltage V IN -0.3 7.0 V Voltages on: ENABLE, VSENSE, VS0-VS2 -0.3 V IN + 0.3 V Voltage on: VFB -0.3 2.7 V Storage Temperature Range T STG -65 150 °C Reflow Temp, 10 Sec, MSL3 JEDEC J-STD-020C 260 °C ESD Rating (based on Human Body Model) 2000 V Recommended Operating Conditions PARAMETER SYMBOL MIN MAX UNITS Input Voltage Range V IN 2.4 5.5 V Operating Ambient Temperature T A -40 +85 °C Operating Junction Temperature T J -40 +125 °C Thermal Characteristics PARAMETER SYMBOL TYP UNITS Thermal Resistance: Junction to Ambient (0 LFM) θJA 100 °C/W Thermal Overload Trip Point T J-TP +150 °C Thermal Overload Trip Point Hysteresis 15 °C

Electrical Characteristics

NOTE: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = 25°C, VIN = 3.6V. CIN = 4.7µF 0603 MLCC, COUT = 22uF 0805 MLCC. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Operating Input Voltage V IN 2.4 5.5 V Output Voltage (presets) (VS pins must not be left floating) V o VS2 VS1 VS0 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 V out 3.3 2.5 1.8 1.5 1.25 1.2 0.8 ext. V Output Voltage (external divider) Vo 0.6 VIN-0.4 V Dynamic Voltage Slew Rate Vslew 1.5 mV/µS Continuous Output Current IOUT VIN = 5V, 0.603V <VOUT < 3.3V TA = -40°C to +85°C 600 mA Continuous Output Current I OUT VIN = 5V, 0.603V <VOUT < 3.3V TA = -10°C to +85°C; (Application Circuit Figure 5.) 700 mA Shut-Down Current I SD Enable = Low 0.75 µA

©Enpirion 2008 all rights reserved, E&OE 5 www.enpirion.com PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Feedback Pin Voltage V FB 0.603 V Feedback Pin Input Current I FB 100 nA VS0-VS1, Enable Voltage Threshold VTH Pin = Low Pin = High 0.0 1.4 0.4 VIN VS0-VS2 Pin Input Current I VSX 1 nA Operating Frequency F OSC 4 MHz PFET On Resistance R DS(ON) 340 mΩ NFET On Resistance R DS(ON) 270 mΩ VOUT Accuracy V OUT TA = 25°C 2.4V ≤ VIN ≤ 5.5V -40°C ≤ TA ≤ +85°CV (all causes) -2% -3% +2% +3% Line Regulation 2.4V ≤ VIN ≤ 5.5V 0.0566 %/V Load Regulation 0A ≤ ILOAD ≤ 700mA 0.0003 %/ mA Soft-Start Operation Soft-Start Slew Rate Vss 1.5 mV/µS Time to 90% Vout T ss Vout = 3.3V 2.2 mS Typical Performance Characteristics 100 Load Current (A) Efficiency (%) 100 Load Current (A) Efficiency (%) 100 Load Current (A) Efficiency (%)

©Enpirion 2008 all rights reserved, E&OE 6 www.enpirion.com Startup, VIN = 3.6V, VOUT = 1.5V, Load = 500mA Shutdown, VIN = 3.6V, VOUT = 1.5V, Load = 500mA Voltage Ripple, VIN = 3.3V, VOUT = 1.8V, Load = 0mA Voltage Ripple, VIN = 3.3V, VOUT = 1.8V, Load = 600mA C OUT = 1x 22uF 0805, 2.0mV/Div. C OUT = 1x 22uF 0805, 2.0mV/Div. Voltage Ripple, VIN = 3.3V, VOUT = 1.8V, Load = 0mA Voltage Ripple, VIN = 3.3V, VOUT = 1.8V, Load = 600mA C OUT = 2x 10uF 0805, 2.0mV/Div. C OUT = 2x 10uF 0805, 2.0mV/Div. Detailed Description

©Enpirion 2008 all rights reserved, E&OE 7 www.enpirion.com Functional Overview The EP5368QI is a complete DCDC converter solution requiring only two low cost MLCC capacitors. MOSFET switches, PWM controller, Gate-drive, compensation, and inductor are integrated into the tiny 3mm x 3mm x 1.1mm package to provide the smallest footprint possible wh ile maintaining high efficiency, low ripple, and high performance. The converter uses voltage mode control to provide the simplest implementation and high noise immunity. The device operates at a 4MHz switching frequen cy. The high switching frequency allows for a wide control loop bandwidth providing ex cellent transient performance. The high switching frequency further enables the use of very small components making possible this unprecedented level of integration. Enpirion’s proprietary power MOSFET technology provides very low switching loss at frequencies of 4 MHz and higher, allowing for the use of very small internal components, and high performance. Integration of the magnetics virtually eliminates t he design/layout issues normally associated wit h switch-mode DCDC converters. All of this enables much easier and faster incorporation into various applications to m eet demanding EMI requirements. Output voltage is chosen from seven preset values via a three pi n VID voltage select scheme. An external divider option enables the selection of any voltage in V IN to 0.6V range. This reduces the number of components that must be qualified and reduces inventory burden. The VID pins can be toggled on the fly to implement glitch free dynamic voltage scaling. Protection features in clude under-voltage lock- out (UVLO), over-current protection (OCP), short circuit protection, and thermal overload protection. Integrated Inductor Enpirion has introduc ed the world’s first product family featuring integrated inductors. The EP5368QI utilizes a proprietary low loss integrated inductor. T he use of an internal inductor localizes the noises associated with the output loop currents. The inherent shielding and compact construction of the integrated inductor reduces the radiated noise that couples into the traces of the circuit board. Further, the package layo ut is optimized to reduce the electrical path length for the AC ripple currents that are a major source of radiated emissions from DCDC converters. The integrated inductor significantly reduces parasitic effects that can harm loop stability, and makes layout very simple. Stable Over Wide Range of Operating Conditions The EP5368QI utilizes an internal type III compensation network and is designed to provide a high degree of stability over a wide range of operating conditi ons. The device operates over the entire input and output voltage range with no exte rnal modifications required. The very high switching frequency allows for a very wide control loop bandwidth. Soft Start Internal soft start circuits limit in-rush current when the device starts up from a power down condition or when the “ENABLE” pin is asserted “high”. Digital control circuitry limits the V OUT ramp rate to levels that are safe for the Power MOSFETS and the integrated inductor. The soft start ramp rate is nominally 1.5V/mS.

©Enpirion 2008 all rights reserved, E&OE 8 www.enpirion.com Over Current/Short Circuit Protection The current limit function is achieved by sensing the current flowing through a sense P- MOSFET which is compared to a reference current. When this leve l is exceeded the P- FET is turned off and the N-FET is turned on, pulling V OUT low. This condition is maintained for a period of 1mS and then a normal soft start is initiated. If the ov er current condition still persists, this cycle will repeat in a “hiccup” mode. Under Voltage Lockout During initial power up an under voltage lockout circuit will hold-off the switching circuitry until the in put voltage reaches a sufficient level to insure proper operation. If the voltage drops below the UVLO threshold the lockout circuitry will again disable the switching. Hysteresis is included to prevent chattering between states. Enable The ENABLE pin provides a means to shut down the converter or enable normal operation. A logic low wil l disable the converter and cause it to shut down. A logic high will enable the converter into normal operation. In shutdown mode, the devic e quiescent current will be less than 1 uA. NOTE: This pin must not be left floating. Thermal Shutdown When excessive power is dissipated in the chip, the junction temperature rises. Once the junction temperature exceeds the thermal shutdown temperature t he thermal shutdown circuit turns off the co nverter output voltage thus allowing the device to cool. When the junction temperature decreases by 15C °, the device will go through the normal startup process.

Application Information

To provide the highest degree of flexibility in choosing output voltage, the EP5368QI uses a 3 pin VID, or Voltage ID , output voltage select arrangement. This allows the designer to choose one of seven preset voltages, or to use an external voltage divider. Internally, the output of the VID multiplexer sets the value for the voltage reference DAC, which in turn is connected to the non-inverting input of the error amplifier. This a llows the use of a single feedback divider with constant loop gain and optimum compensation, independent of the output voltage selected. Table 1 shows the vari ous VS0-VS2 pin logic states and the associ ated output voltage levels. A logic “1” indicates a connection to V IN or to a “high” logic voltage level. A logic “0” indicates a connection to ground or to a “low” logic voltage level. These pins can be either hardwired to V IN or GND or alternatively can be driven by standard logic levels. Logic low is defined as V LOW ≤ 0.4V. Logic high is defined as VHIGH ≥ 1.4V. Any level between these two values is indeterminate. These pins must not be left floating. VS2 VS1 VS0 V OUT 0 0 0 3.3V 0 0 1 2.5V 0 1 0 1.8V 0 1 1 1.5V 1 0 0 1.25V 1 0 1 1.2V 1 1 0 0.8V 1 1 1 User Selectable Table 1. VID voltage select settings.

©Enpirion 2008 all rights reserved, E&OE 10 www.enpirion.com For 700mA operation, use the following component values: R a = 249KΩ. Ca = 15pF 0402 MLCC capacitor. Then R b is given as: Ω−= 603.0 10501.1 5 OUT b V x R VOUT can be programmed ov er the range of 0.603V to VIN-0.4V. Stability cannot be assur ed if these guidelines are not followed. Recommended PCB Footprint

©Enpirion 2008 all rights reserved, E&OE 11 www.enpirion.com Package Dimensions

©Enpirion 2008 all rights reserved, E&OE 12 www.enpirion.com Contact Information Enpirion, Inc.

685 US Route 202/206 Suite 305

Bridgewater, NJ 08807 Phone: +1 908-575-7550 Fax: +1 908-575-0775 Enpirion reserves the right to make changes in circuit design and/or specifications at any time without notice. Information furnished by Enpirion is believed to be accurate and reliable. Enpirion assumes no responsibility for its use or for infringement of patents or other third party rights, which may result from its use. Enpirion products are not authorized for use in nuclear control systems, as critical components in life support systems or equipment used in hazardous environment without the express written authority from Enpirion.