EP5388QI

EP5388QI ENPIRION | Alldatasheet

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Technical content

www.enpirion.com EP5388QI 800mA Synchronous Buck Regulator With Integrated Inductor 3mm x 3mm x 1.1mm Package July 2008 RoHS Compliant Halogen Free Product Overview The EP5388QI is a synchronous buck converter with integrated Inductor, PWM controller, MOSFETS, and Compensation providing the smallest po ssible solution size. The EP5388QI requires only two small MLCC capacitors to make a complete solution. Integration of the induc tor greatly simplifies design, contains noise, reduces part count, and reduces solution footprint. Low output ripple ensures compatibility with RF systems. The EP5388QI operates at a switching frequency of 4 MHz, enabling this unprecedented level of integration and small external components. Type III voltage mode control is used to provide high noise immunity and wide control loop bandwidth. The small footprint makes this part ideal for space constrained por table applications. Shutdown current of <1uA extends battery life Output voltage level is programmed via a 3-pin VID selector providin g seven pre-programmed output voltages along with an option for external resistor divider.

Applications

• Noise Sensitive RF Applications
• Area Constrained Applications
• Wireless Data Applications
• Portable Gaming Devices
• Personal Media Players
• Advanced Mobile Processors, DSP, IO, Memory, Video, Multimedia Engines

Ordering Information

Part Number Temp Rating (°C) Package EP5388QI-T -40 to +85 16-pin QFN T&R EP5388QI-E EP5388QI Evaluation Board Product Highlights Featuring Integrated Inductor Technology

• 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 800mA continuous output current
• Wide 2.4V to 5.5V input range
• VOUT range 0.6V to VIN – 0.5V
• 3-Pin VID output voltage programming
• 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
• RoHS compliant; MSL 3 260°C reflow Typical Application Circuit VIN VSense Vin VS1 VS2 VS0 EP5388QI 47uF 1206 4.7µF 0603 VOUT Vout GND ENABLE VFB Voltage Select

Figure 1. Typical application circuit.

Figure 2. EP5388QI Package Pin-out. in part malfunction or damage.

4 VFB

“ground” side of the external divider should be connected to AGND. 5 VSENSE Sense pin for preset output vo ltages. Connect at the output capacitor.

12 VS2,VS1,VS0

13 ENABLE Output enable. Enable = logic high, disable = logic low.

Figure 3. EP5388QI Functional block diagram. extended periods may affect device reliability.

©Enpirion 2008 all rights reserved, E&OE 4 www.enpirion.com Recommended Operating Conditions PARAMETER SYMBOL MIN MAX UNITS Input Voltage Range V IN 2.4 5.5 V Output Voltage Range V OUT 0.603 V IN – 0.5 V Output Current I OUT 0 800 mA 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 Shutdown Trip Point T J-TP +150 °C Thermal Shutdown Trip Point Hysteresis 15 °C * Based on a 2 oz. copper board and proper thermal design in line with JEDEC EIJ-JESD51 standards.

Electrical Characteristics

NOTE: VIN = 3.6V, CIN = 4.7µF 0603 MLCC, COUT = 47uF 1206 MLCC. TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = 25°C. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Under-Voltage Lockout V UVLO V IN going low to high 2.2 2.3 V UVLO Hysteresis 0.145 V VOUT Initial Accuracy ∆VOUT_Initl T A = 25C, 2.4V ≤ VIN ≤ 5.5V -2 +2 % Line Regulation ∆VOUT_linel 2.4V ≤ VIN ≤ 5.5V 0.06 %/V Load Regulation ∆VOUT_load 0A ≤ ILOAD ≤ 800mA 0.0003 %/mA Temperature Variation ∆VOUT_templ -40°C ≤ TA ≤ +85°C 0.008 %/°C Overall VOUT Accuracy (Line, Load, and Temperature combined) ∆VOUT_All 2.4V ≤ VIN ≤ 5.5V -40°C ≤ TA ≤ +85°C 0A ≤ ILOAD ≤ 800mA -3 +3 % Dynamic Voltage Slew Rate† Vslew 1.125 1.5 1.875 V/mS Continuous Output Current IOUT -20°C ≤ TA ≤ +85°C -40°C ≤ TA ≤ +85°C 800 750 mA Shut-Down Current I SD Enable = Low 0.75 µA PFET OCP Threshold I LIM 1000 mA Feedback Pin Voltage V FB 2.4V ≤ VIN ≤ 5.5V -20°C ≤ TA ≤ +85°C 0A ≤ ILOAD ≤ 800mA 0.585 0.603 0.621 V Feedback Pin Input Current IFB 10 nA VS2-VS0 Threshold V SX_TH Pin = Low Pin = High 0.0 1.4 0.4 VIN V VS2-VS0 Pin Input Current IVSX 1 nA Enable Pin Voltage Thresholds VEN_TH Pin = Low Pin = High 0.0 1.4 0.2 VIN V Enable Pin Input Current I EN ENABLE = Vin = 3.6V 2 µA Operating Frequency F OSC 4 MHz PFET On Resistance R DS(ON) 340 mΩ NFET On Resistance R DS(ON) 270 mΩ Dropout Resistance RDROPOUT 450 mΩ

©Enpirion 2008 all rights reserved, E&OE 5 www.enpirion.com PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Soft-Start Operation Soft-Start Slew Rate† V ss 1.125 1.5 1.875 V/mS Time to 90% Vout T ss Vout = 3.3V 2 mS † Parameter guaranteed by design. Typical Performance Characteristics Typical performance characteristics are measured using the application circuit in Figure 1. All measurements made at 25ºC. Load Current (A) Efficiency (%) top to bottom. top to bottom. Load Current (A) Efficiency (%) top to bottom. Load Current (A) Efficiency (%)

©Enpirion 2008 all rights reserved, E&OE 6 www.enpirion.com

©Enpirion 2008 all rights reserved, E&OE 7 www.enpirion.com Enable in light blue; VOUT in Dark blue. Enable in light blue; V OUT in Dark blue. Detailed Description Functional Overview The EP5388QI 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 the design/layout issues normally associated wit h switch-mode DCDC converters. All of this enables much easier and faster incorporation into various applications to meet demanding requirements.

©Enpirion 2008 all rights reserved, E&OE 8 www.enpirion.com 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 0.603V to V IN-0.5V 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 between any two of the seven preset VID voltage levels. Protection features in clude under-voltage lock- out (UVLO), over-current protection (OCP), short circuit protection, and thermal overload protection. Integrated Inductor Enpirion has introduced the world’s first product family featuring integrated inductors. The EP5388QI 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 EP5388QI utilizes an internal type III compensation network and is designed to provide a high degree of stability over a wide range of operating conditions. 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. Over Current/Short Circuit Protection When an over current condition occurs, V OUT is pulled low. This condition is maintained for a period of approximately 1.2 ms and then a normal soft start cycle is initiated. If the over current condition still persists, this cycle will repeat. 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. Transitioning fr om low to high will cause the converter to go through a soft start cycle. Transitioning from high to a low will cause the device to discharge the output and then shutdown. In shutdown mode, the device quiescent current will be less than 1 uA. NOTE: This pin must not be left floating.

identical to the soft-start slew rate of 1.5V/mS. settings and the external divider is not allowed.

1. Note that in this configuration, V

on other output capacitor usage. Figure 5. Applications circuit for COUT = 1 x 10uF 0805. *Optimized PCB layout file is downloadable from the Enpirion website to assure first pass design success. Refer to figure 6 for the following layout recommendations. physical area of these AC current loops. current loop to the output current loop.

vias should connect to the ground island and continue down to the PCB system ground plane. described in recommendation 4. AGND must NOT be connected to the surface layer ground pour. control lines under the converter package. Figure 6. PCB layout recommendation.

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

©Enpirion 2008 all rights reserved, E&OE 13 www.enpirion.com Package Dimensions

©Enpirion 2008 all rights reserved, E&OE 14 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.