EC9288 E-CMOS | Alldatasheet

Document overview

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Technical content

Features

  • 92%EffiicencySynchronousBoostConverter With 1000-mA Output Current From 1.8V Input
  • Stable with Low ESR Output Capacitors
  • Fixed 1.2MHz Oscillator Frequency
  • Low EMI Converter (Integrated Anti-Ringing Function)
  • Low Battery Output
  • Integrated Power Save Mode Operation to Improve Light Load Efficiency
  • On load startup
  • Automatic restart after protection
  • Load Disconnected During Shutdown
  • Output Current-Limit Protection
  • Over Temperature Protection
  • Under Voltage Protection
  • Enable/Shutdown Function
  • Available in SOP-8(Exposed Pad) Packages
  • Lead Free and Green Devices Available( RoHS Compliant)

Applications

  • Power Bank
  • Tablet
  • Portable Equiment Pin Configurations

5V 6A 1.2MHz Synchronous Boost Converter EC9288 Pin Description

Ordering Information

Part Number Package Marking Marking Information EC9288NNMHR SOP-8 Exposed Pad 9288 LLLL YYWW 1. LLLL：Lot No 2. YYWW：Date Code NO. NAME FUNCTION 1 VBAT Converter Supply Voltage. 2 PSI Power Saving Input. Force VPSI exceed 1V enter PFM. Left VPSI below 0.4V enter PWM mode 3 EN Device Enable Control Input. Force VEN exceed 1V enable the device. Left VEN below 0.4V to shutdown. 4 GND Signal Ground. Connect this pin to PGND. 5 FB Converter Feedback Input.

6 VOUT Converter Output and IC Supply Voltage

7 SW Converter Switch Pin. Connect inductor here. 8 PGND Power Ground. Connect these pins to GND. EC9288NN XX X R=Tape & Reel Package Type MH=SOP 8(Exposed Pad)

5V 6A 1.2MHz Synchronous Boost Converter EC9288 Functional Block Diagram Figure 2 Function Block Diagram of EC9288

5V 6A 1.2MHz Synchronous Boost Converter EC9288 Symbol Parameter Rating Unit VOUT Output and IC Supply Voltage (VOUT to GND) -0.3 ~ 7 V VBAT Converter Supply Voltage (VBAT to GND) -0.3 ~ 7 V VSW SW to GND Voltage >30ns -0.3 ~ 7 V <30ns -0.3 ~ 9 V EN and FB to GND Voltage -0.3 ~ 7 V PGND to GND -0.3 ~+0.3 V TJ Maximum Junction Temperature 150 ℃ C TSTG Storage Temperature -65 ~ 150 ℃ C TSDR Maximum Lead Soldering Temperature (10 Seconds) 260 ℃ Absolute Maximum Ratings Note1: Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Thermal Characteristics θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. Recommended Operating Conditions(Note 3) Symbol Parameter Rating Unit VOUT Output and IC Supply Voltage (VOUT to GND) 2.7 ~5.5 V VBAT Converter Supply Voltage (VBAT to GND) 1.8 ~ VOUT V VSW SW to GND Voltage >30ns -0.3 ~ VOUT +0.3 V <30ns -3 ~ VOUT +3 V LBI, SYNC, EN, LBO and FB to GND Voltage 0 ~ VOUT V TJ Junction Temperature -40 ~ 125 ℃ C TA Ambient Temperature -40 ~ 85 ℃ Note 3 : Refer to the typical application circuit Symbol Parameter Typical Value Unit θJA Junction-to-Ambient Resistance in free air (Note 2) 50 θJC Junction-to-Case Resistance 20

5V 6A 1.2MHz Synchronous Boost Converter EC9288

Electrical Characteristics

Unless otherwise specified, these specifications apply over VBAT=3.3V, VOUT=5V and TA= 25 ℃ Symbol Parameter Test Conditions Min Typ Max Unit VBAT Converter Supply Voltage Range 1.8 - 5.5 V VOUT Converter Output and IC Supply Voltage 3.0 - 5.5 V IDD1 No Switching Quiescent Current Measured from VOUT, VFB=0.6V, VOUT=3.3V - 40 60 uA IVBAT VBAT Quiescent Current Measured from VBAT, VBAT=3.3V, EN=H - 0.5 1 uA IVBAT-SD VBAT Quiescent Current VEN=GND, VBAT=3.3V (Isolate VBAT & VOUT) - 0.1 1 uA VUVLO VBAT Under Voltage Lockout Threshold 1.6 1.7 1.8 V VREF Regulated Feedback Voltage 490 500 510 mV IFB FB Input Leakage Current -100 - 100 nA Over Temperature Protection(note 4) Hysteresis(note 4) TJ Falling - 30 - O C FOSC Switching Frequency FB=GND 900 1200 1500 KHz RN-FET N-FET Switch On Resistance VOUT=5V - 55 - mΩ RP-FET P-FET Switch On Resistance VOUT=5V - 55 - mΩ N-FET Current Limit VOUT=5V 6 - - A Dead-time (note 4) VOUT=3.3V~5V - 10 - ns DMAX SW Maximum Duty Cycle 85 95 - % PFM Current Limit - 700 - mA EN EN Input Low Threshold - - 0.4 V EN Input High Threshold 1 - - V Internal Pull Low - 500 - kΩ PSI PSI Input Low Threshold - - 0.4 V PSI Input High Threshold 1 - - V IEN EN Input Leakage Current VEN=1.5V - 3 5 uA IPSI PSI Input Leakage Current VPSI=1.5V - 0.4 1 uA VZC P-FET Zero Current Detect - +100 - mA VFB Under Voltage Protection 70 75 80 %VREF UVP Debounce (Option) - 2 - us TOTP Over Temperature Protection (note 4) (note 4) TJ Rising - 150 - ℃ Over Temperature Protection (note 4) Hysteresis(note 4) TJ Falling - 30 - ℃ Note 4: Guaranteed by design, not production tested.

5V 6A 1.2MHz Synchronous Boost Converter EC9288 Typical Operating Characteristics

5V 6A 1.2MHz Synchronous Boost Converter EC9288 Typical Operating Characteristics(Cont.)

5V 6A 1.2MHz Synchronous Boost Converter EC9288 Typical Operating Characteristics(Cont.)

5V 6A 1.2MHz Synchronous Boost Converter EC9288 Typical Operating Characteristics(Cont.)

5V 6A 1.2MHz Synchronous Boost Converter EC9288 Typical Application Circuit Function Description Main Control Loop The EC9288 is a constant frequency, synchronous rectifier, and current-mode switching regulator. In normal operation, the internal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and turned off when an internal c omparator (ICMP) re sets the latch. The peak inductor current wh ich ICMP resets the RS latch is controlled by the voltage on the COMP node, which is the output of the error amplifie r (EAMP). An external resistive divider connected between V OUT and ground al lows the EAMP to receive an output feedback voltage V FB at FB pin. When the load current increases, it causes a slightly decrease in V FB relative to the 0.5V refe rence, which in turn causes the COMP voltage to increase unt il the average inductor current matches the new load current. Start-up A start-up oscillator circuit is integrated in the EC9288. When the device enables, the c ircuit pumps the output voltage high. Once the output voltage reaches 1.6V (typ), the main DC-DC circuitry turns on and boosts th e output voltage to the final regulation voltage. Automatic PFM/PWM mode Switch The EC9288 is a fixed frequency PWM peak current modulation control step-up converter. At light loads, the EC9288 will automatically enter in pulse frequency modulation operation to reduce the dominant switching losses. In PFM operation, the inductor current may reach zero or reverse on each pulse. A zero current comparator turns off the P-channel synchronous MOSFET, forcing DCM(Discontinuous Current Mode) operation at light load. These controls get very low quiescent current, help to maintain high efficiency over the complete load range. Synchronous Rectification The internal synchronous rectifier eliminates the need for an external Schottky diode, thus reducing cost and board space. During the cycle off-time, the P-FET turns on and shunts the FET body diode. As a result, the synchronous rectifier significantly improves efficiency without the addition of an external component. Conversion efficiency can be as high as 92%.

5V 6A 1.2MHz Synchronous Boost Converter EC9288 Load Disconnect Driving EN to ground places the EC9288 in shutdown mode. When in shutdown, the internal power MOSFET turns off, all internal circuitry shut s down and the quiescent supply current reduces to 1uA maximum. A special circuit is applied to disconnect the load from the input during shutdown the converter. In conventional synchronous rectifier circu its, the back-gate diode of the high side P-FET is forwar d biased in shutdown and allows current flowing from the batte ry to the output. However, this device uses a special circuit, which takes the cathode of the back-gate diode of the hig h-side P- FET and disconnects it from the source when the regulator is shutdown. The benefit of this feature for the s ystem design engineer is that the battery is not depleted durin g shutdown of the converter. No additional components must be added to the design to make sure that the battery is disc onnected from the output of the converter. Current-Limit Protection TheEC9288 monitors the inductor current, flowing through the N-FET, and limits the current peak at current limit level to prevent loads and the EC9288 from damages during overload conditions. Over-Temperature Protection (OTP) The over-temperature circuit limits the junction temperature of the EC9288. When the junction temperature exceeds 150℃, a thermal sensor turn s off the both N -FET and P - FET, allowing the devices to cool. The thermal sensor allows the converters to start a soft-start process and regulate the output voltage again after the junction temperature cools by 30℃. The OTP is designed with a 30 ℃ hysteresis to lower the average Junction Temperature (T J) during continuous thermal overload conditions, increasing the lifetime of the device.

5V 6A 1.2MHz Synchronous Boost Converter EC9288

Package Information

SOP 8L (Exposed Pad) Package Outline Dimensions