EC2960 E-CMOS | Alldatasheet

Document overview

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Technical content

Features

  • Provide Bi-direction Output Currents
  • Sourcing and Sinking Current up to 1.5A/2A Built-in Soft-Start
  • Power-On-Reset Monitoring on VCNTL and VIN pins
  • Fast Transient Response
  • Stable with Ceramic Output Capacitors ±20mV High System Output Accuracy over Load and Temperature Ranges
  • Adjustable Output Voltage by External Resistors
  • Current-Limit Protection
  • On-Chip Thermal Shutdown
  • Shutdown for Standby or Suspend Mode
  • SimpleSOP-8 with Exposed Pad(SOP8-EP) Packages
  • Lead Free and Green Devices Available(RoHS Compliant)

Applications

  • DDRII/III SDRAM Termination Voltage
  • Motherboard and VGA Card Power Supplies
  • Setop Box
  • SSTL-2/3 Termination Voltage Type Application Circuit

Figure 1. Type Application Circuit of EC2960/EC2960A

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960 Pin Assignments Figure 2 Pin Configuration of EC2960/EC2960A (Top View) Pin Description Pin Number Pin Name Description

1 VIN

Main Power Input Pin. Connect this pin to a voltage source and an input capacitor. The EC2960/EC2960A sources current to VOUT pin by controlling the upper pass MOSFET, providing a current path from VIN to VOUT.

2 GND

Power and Signal Ground. Connect this pin to system ground plane with shortest traces. The EC2960/EC2960A sinks current from VOUT pin by controlling the lower pass MOSFET, providing a current path from VOUT to GND. This pin is also the ground path for internal control circuitry.

3 VREF

Reference Voltage Input and Active-high Enable Control Pin. Apply a voltage to this pin as a reference voltage for the EC2960/EC2960A. Connect this pin to a resistor diver, between VIN and GND, and a capacitor for filtering noise purpose. Applying and holding the voltage below the enable voltage threshold on this pin by an open-drain transistor shuts down the output. During shutdown, the VOUT pin has high input impedance.

4 VOUT

I Output Pin of The Regulator. Connect this pin to load and output capacitors (>8μF MLCC is necessary) required for stability and improving transient response. The output voltage is regulated to track the reference voltage and capable of sourcing or sinking current up to 1.5A/2A. 5,7,8 NC No Internal Connection.

6 VCNTL

Power Input Pin for Internal Control Circuitry. Connect this pin to a voltage source, providing a bias for the internal control circuitry. A decoupling capacitor is connected near this pin. Exposed Pin GND Chip Substrate Connection of The Chip. Connect this pad to system ground plane for good thermal conductivity.

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960

Ordering Information

Part Number Package Marking Marking Information EC2960NNMHR SOP-8 (Exposed PAD) EC2960 LLLLL YYWWT 1. LLLLL：last five number of lot No 2. YYWW：date code 3. T：Internal tracking code EC2960ANMHR SOP-8 (Exposed PAD) 2960A LLLLL YYWWT 1. LLLLL：last five number of lot No 2. YYWW：date code 3. T：Internal tracking code Package Types Figure 3. Package Types of EC2960/EC2960A

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960 Absolute Maximum Ratings Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any oth er conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Recommended Operating Conditions Parameter Symbol Value Unit VCNTL Supply Voltage(VCNTL to GND) VCNTL -0.3 to 7 V VIN Supply voltage(VIN to GND) VIN -0.3 to 7 V VREF Input Voltage(VREF to GND) VREF -0.3 to 7 V VOUT Output Voltage(VOUT to GND) VOUT -0.3 to Vin+0.3 V Power Dissipation PD Internally Limited mW Operating Junction Temperature TJ 150 ℃ Storage Temperature TSTG -65 to 150 ℃ Lead Temperature (Soldering, 10 sec) TLEAD 260 ℃ ESD (HBM) 2000 V MSL Level3 Thermal Resistance-Junction to Ambient RθJA 55 ℃ / W Thermal Resistance-Junction to Case RθJC 20 ℃ / W Parameter Symbol Min. Max. Unit VCNTL Supply Voltage VCNTL 3 5.5 V VIN Supply Voltage VIN 1.2 5.5 V VREF Input Voltage VREF 0.6 VCNTL-2.2 V VOUT Output Voltage VOUT VREF±0.02 V VOUT Output Current(EC2960) IOUT -1.5 1.5 A VOUT Output Current(EC2960A) -2 2 Capacitance of Input Capacitor CIN 10 100 uF Equivalent Series Resistor(ESR) of Input Capacitor 0 200 mΩ Capacitance of Output Multi-layer Ceramic Capacitor(MLCC) COUT 8 47 uF Total Output Capacitance 10 330 uF Operating Junction Temperature TJ -40 125 ℃ Operating Ambient Temperature TA -40 85 ℃

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960

Electrical Characteristics

Refer to the typical application circuit. These specifications apply over VCNTL=5V, VIN=1.8V or 1.5V, VREF=0.5VIN, CIN=10μF, COUT=10μF (MLCC) and TA=-40~85℃, unless otherwise specified. Typical values are at TA=25℃. Parameters Symbol Test Condition Min. Typ. Max. Unit SUPPLY CURRENT VCNTL Supply Current ICNTL IOUT=0A 1 2 uA VREF=0V(Shutdown) 5 uA VIN Supply Current at Shutdown IFB VREF=GND(Shutdown) 5 uA POWER-ON-RESET(POR) Rising VCNTL POR Threshold VCNTL Rising 2.5 2.75 2.9 V VCNTL POR Hysteresis 0.35 V Rising VIN POR Threshold VIN Rising 0.7 0.9 1.05 V VIN POR Hysteresis 0.3 V OUTPUT VOLTAGE VOUT Output Voltage VOUT IOUT=0A,VREF=0.7~2.8V VREF V System Accuracy Over temperature and load current ranges -20 20 mV VOUT Offset Voltage(VOUT-VREF) VOS IOUT=10mA -7 -1 mV IOUT=-10mA 8 12 Load Regulation IOUT=10mA~1.5A -13 -8 mV IOUT=-10mA~-1.5A 4 8

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960 Electrical Characteristics(Cont.) Refer to the typical application circuit. These specifications apply over VCNTL=5V, VIN=1.8V or 1.5V, VREF=0.5VIN, CIN=10μF, COUT=10μF (MLCC) and TA=-40~85℃, unless otherwise specified. Typical values are at TA=25℃. Parameters Symbol Test Condition Min. Typ. Max. Unit PROTECTIONS Current-Limit(EC2960/EC2960A) ILIM Sourcing Current(VIN =1.8V) TJ=25℃ 1.8 2 3 A 2.2 3 4 TJ=125℃ 1.6 Sinking Current(VIN =1.8V) TJ=25℃ -2 -2.2 -3 -3 -2.8 4 TJ=125℃ -1.6 Sourcing Current(VIN =1.5V) TJ=25℃ 1.6 1.8 2.0 A -2 -2.2 3 TJ=125℃ 1.1 1.4 Sinking Current(VIN =1.5V) TJ=25℃ -1.6 -1.8 -2.6 -2 -2.2 -3.6 TJ=125℃ -1.1 Thermal Shutdown Temperature TSD TJ rising 150 Thermal Shutdown Hysteresis 40 VREF Enable Voltage Threshold 0.15 0.3 0.4 V VREF Bias Current IVREF -100 100 nA Soft-Start Interval TSS 0.1 0.2 0.4 ms

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960 Typical Operating Characteristics VOUT Offset Voltage vs. Sourcing Current-Limit vs. Junction Temperature Junction Temperature Sinking Current-Limit vs. VCNTL Power Supply Junction Temperature Rejection Ratio (PSRR)

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960 Typical Operating Characteristics(Cont.) Sourcing Current-Limit vs. Sinking Current-Limit vs. Junction Temperature Junction Temperature Transient test(Source) (Vin=1.35V,Vcntl=3.3V,Vref=1/2Vin,Load：0A->2A->0A)

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960 Transient test(Sink) (Vin=1.35V,Vcntl=3.3V,Vref=1/2Vin,Load：0A->2A->0A) Short Circuit Protection

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960 Function Description Power­On­Reset A Power-On-Reset (POR) circuit monitors both input voltages at VCNTL and VIN pins to prevent wrong logic ontrols. The POR function initiates a soft-start process fter both of the supply voltages exceed their rising POR oltage thresholds during powering on. Output Voltage Regulation The output voltage on VOUT pin is regulated to track the eference voltage applied on VREF pin. Two internal Nchannel ower MOSFETs controlled by high bandwidth ror amplifiers regulate the output voltage by sourcing urrent from VIN pin or sinking current to GND pin. An nternal output voltage sense pad is bonded to the VOUT in with a bonding wire for perfect load regulation.For preventing the two power MOSFETs from shootthrough, small voltage offset between the positive inputs f the two error amplifiers is designed. It results in igher output voltage while the regulator sinks light or eavy load current. The EC2960/EC2960A provides very fast load transient response t small output capacitance to save total cost. Current­Limit The EC2960/EC2960A monitors the output current, both sourcing nd sinking current, and limits the maximum output current o prevent damages during current overload or shortcircuit shorted from VOUT to GND or VIN) conditions. Enable during continuous thermal overload conditions,increasing lifetime of the EC2960/EC2960A. The VREF pin is a multi-function input pin which is the reference voltage input pin and the enable control input pin. Applying and holding the voltage (VREF) on VREF be- low 0.3V (typical) shuts down the output of the regulator. In the typical application, an NPN transistor or N-channel MOSFET is used to pull down the VREF while applying a “high” signal to turn on the transistor. When shutdown function is active, both of the internal power MOSFETs are turned off and the impedance of the VOUT pin is larger than 10MΩ. Internal and External Soft­ Start The EC2960/EC2960A is designed with an internal soft-start function to control the rise rate of the output voltage to prevent inrush current during start-up. When release the pull-low transistor connected with VREF pin, the current via the resistor divider charges the external soft-start capacitor (C4) and the VREF starts to rise up.The IC starts a soft-start process when the VREF reaches the enable voltage threshold. The output voltage is regulated to follow the lower voltage, which is either the internal soft-start voltage ramp or the VREF voltage, to rise up. The external soft-start interval is programmable by the resistor-divider and the soft-start capacitor (C4). Thermal Shutdown The thermal shutdown circuit limits the junction temperature of the EC2960/EC2960A. When the junction temperature exceeds 150℃, a thermal sensor turns off the both pass transistors, allowing the device to cool down. The thermal sensor allows the regulator to regulate again after the junction temperature cools by 40℃, resulting in a pulsed output during continuous thermal overload conditions. The thermal limit is designed with a 40℃ hysteresis to lower the average TJ

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960

Application Information

The input sequence of powers applied for VIN and VCNTL is not necessary to be concerned. Reference Voltage A reference voltage is applied at the VREF pin by a resistor divider between VIN and GND pins. An external bypass capacitor is also connected to VREF. The capacitor and the resistor divider form a low-pass filter to reduce the inherent reference noise from VIN. The capacitor is a 0.1uF or greater ceramic capacitor and connected as close to VREF as possible. More capacitance and large resistor divider will increase the soft-start interval. Do not place any additional loading on this reference input pin. Input Capacitor The EC2960/EC2960A requires proper input capacitors to supply current surge during stepping load transients to prevent the input rail from dropping. Because the parasitic inductors from the voltage sources or other bulk capacitors to the VIN pin limit the slew rate of the input current, more parasitic inductance needs more input capacitance. For the EC2960, the total capacitance of input capacitors value including MLCC and aluminum electrolytic capacitors should be larger than 10uF. For VCNTL pin, a capacitor of 0.47uF (MLCC) or above is recommended for noise decoupling. Output Capacitor The EC2960/EC2960A needs a proper output capacitor to maintain circuit stability and improve transient response. In order to insure the circuit stability, a 10uF X5R or X7R MLCC output capacitor is sufficient at all operating temperatures and it must be placed near the VOUT. The maximum distance from output capacitor to VOUT must within 10mm. Total output capacitors value including MLCC and aluminum electrolytic capacitors should be larger than 10uF Table 1 provides the suitable output capacitors for EC2960 Operation Region and Power Dissipation The EC2960/EC2960A maximum power dissipation depends on the thermal resistance and temperature difference between the die junction and ambient air. The power dissipation PD across the device is: Where (TJ-TA) is the temperature difference between the junction and ambient air. θJA is the thermal resistance between junction and ambient air. Assuming the TA=25℃ and maximum TJ=150℃ (typical thermal limit threshold), the maximum power dissipation is calculated as:

Source and Shink 1.5A/2A Fast Transient Response Line Regulator EC2960

Package Information

SOP-8(Exposed PAD) Package Outline Dimensions