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EC9409
2A 150KHz PWM Buck DC/DC Converter
Description
The EC9409 is a of easy to use adjustable step-down (buck) switch-mode voltage regulator. The device is available in an adjustable output version. It is capable of driving a 2A load with excellent line and load regulation. Requiring a minimum number of external omponents, these regulators are simple to use and include internal frequency compensation, and a fixed-frequency oscillator. The output voltage is guaranteed to 3% tolerance under specified input voltage and output load conditions. The oscillator frequency is guaranteed to 15%. External shutdown is included, featuring typically 50 A standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.
Features
3,3V,5.0V and Adjustable output versions Output adjustable from 1.23v to 43V Fixed 150KHz frequency internal oscillator Guaranteed 2A output load current Input voltage range up to 45V Low power standby mode, IQ typically 50 A TTL shutdown capability Excellent line and load regulation High efficiency Thermal shutdown and current limit protection Available in advantaged SOP8 and DIP8 package
Applications
Simple High-efficiency step-down regulator On-card switching regulators Positive to negative converter LCD monitor and LCD TV DVD recorder and PDP TV Battery charger Step-down to 3.3V for microprocessors
Block Diagram
E-CMOS Corp. (www.ecmos.com.tw)
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2007/05/02
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EC9409
2A 150KHz PWM Buck DC/DC Converter
Pin Assignment (Top-View)
SOP8/DIP8
Pin Descriptions
Pin
1 2 3 4 5~8
Name
Vin Output Feedback ON/OFF Gnd
Description Input supply voltage Switching output Output voltage feedback ON/OFF shutdown Active is "Low" or floating Ground
Ordering/ Marking Information
EC9409 -XXX - X F
Circuit Type F: Lead-Free Package: N = SOP8 P = DIP8
Output Voltage: ADJ = Adjustable 5.0 = 5.0V 3.3 = 3.3V
Package type
Part Number
Marking
Marking Information
F is Lead free package. XXX is the Output Voltage of production. oooooooo is Lot number
SOP8
EC9409-XXX-NF
EC9409-F XXX oooooooo
DIP8
EC9409-XXX-PF
E-CMOS Corp. (www.ecmos.com.tw)
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2007/05/02
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EC9409
2A 150KHz PWM Buck DC/DC Converter
Absolute Maximum Ratings
Note: 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 other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Parameter
Supply Voltage Vin Feedback VFB pin voltage ON/OFF Pin voltage Output pin voltage Output Voltage to Ground (Steady State) Power Dissipation Operating Temperature Range Storage Temperature Lead Temperature (Soldering, 10 sec) ESD(HM)
Symbol
VIN VFB VON/OFF VOUT PD Topr Tstg TLead VESD
Value
-0.3 ~ 45 -0.3 ~ VIN +0.3 -0.3~ VIN +0.3 -0.3 ~ VIN +0.3 -1 Internally limited -40~+125 -65~+150 200 2000
Unit
V V V V V W
o o o
C C C
V
Electrical Characteristics
Unless otherwise specified, Vin = 12V. Iload = 0.5A, Ta = 25.
Symbol
Ib IQ ISTBY FOSC VSAT ICL IL IL VIL VIH IH IL JC
Parameter
Feedback bias current Quiescent current Standby quiescent current Oscillator frequency Saturation voltage Current Limit Output leakage current Output leakage current ON/OFF pin logic input Threshold voltage
Conditions
VFB=1.3V VFB=12V force driver off ON/OFF=5V, VIN=36V IOUT=2A Peak Current (VFB=0V) Output=0V (VFB=12V) Output=-1V (VIN=32V) Low (Regulator ON) High (Regulator OFF) VLOGIC=2.5V(Regulator OFF) VLOGIC=0.5V(Regulator ON)
Min.
127 2.0 -
Typ.
10 5 50 150 1.10 3.8 2 1.3 1.3 5 0.02 10
Max.
50/100 10 100 173 1.3 50 30 0.6 15 5 -
Unit
nA mA uA KHz V A uA mA V V uA uA
o
ON/OFF pin input current Thermal Resistance Junction to Case Thermal Resistance Junction
SOP8/DIP8 SOP8/DIP8
C /W
JA
to Ambient (Note1)
-
40
-
o
C /W
E-CMOS Corp. (www.ecmos.com.tw)
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2007/05/02
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EC9409
2A 150KHz PWM Buck DC/DC Converter
Electrical Characteristics (Continued)
Unless otherwise specified, Vin = 12V. Iload = 0.5A, Ta = 25.
Vfb: Output Voltage ADJ : Efficiency Vout: Output Voltage : Efficiency Vout: Output Voltage : Efficiency
11VVIN45V, 0.2AILOAD 2A Vout for 9V VIN=12V,VOUT=9V,ILOAD=2A 7VVIN 45V, 0.2AILOAD 2A VIN=12V, ILOAD=2A 4.75VVIN 45V, 0.2AILOAD 2A VIN=12V, ILOAD=2A
1.193/ 1.180 4.800/ 4.750 3.168/ 3.135 -
1.23 89 5.0 85 3.3 76
1.267/ 1.280 5.200/ 5.250 3.432/ 3.465 -
V
% V % V %
5.0V
3.3V
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25 oC. Note1: Thermal resistance with copper area of approximately 3 in2.
E-CMOS Corp. (www.ecmos.com.tw)
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EC9409
2A 150KHz PWM Buck DC/DC Converter
Typical Performance Characteristics
Output Voltage vs. Temperature
Switching Frequency vs. Temperature
Output Saturation Characteristics
Quiescent Current vs. Temperature
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EC9409
2A 150KHz PWM Buck DC/DC Converter
Typical Performance Characteristics (Continued)
ON/OFF Pin Voltage
ON/OFF Pin Sink Current
Output Saturation Characteristics
E-CMOS Corp. (www.ecmos.com.tw)
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2007/05/02
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EC9409
2A 150KHz PWM Buck DC/DC Converter
Typical Application Circuit
Typical Application of EC9409 for 5.0V, 3.3V
EC9409 Series Buck Regulator Design Procedure for 5.0V Input Voltage
8V ~ 18V 8V ~ 45V
Inductor (L1)
33uh 47uh
Output Capacitor (Cout) Through Hole Electrolytic
330uf/25V 470uf/25V
Surface Mount Tantalum
220uf/10V 330uf/10V
EC9409 Series Buck Regulator Design Procedure for 3.3V Input Voltage
6V ~ 18V 6V ~ 45V
Inductor (L1)
47uh 68uh
Output Capacitor (Cout) Through Hole Electrolytic
470uf/25V 560uf/25V
Surface Mount Tantalum
330uf/6.3V 330uf/6.3V
E-CMOS Corp. (www.ecmos.com.tw)
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2007/05/02
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EC9409
2A 150KHz PWM Buck DC/DC Converter
Typical Application Circuit (Continued)
Typical Application of EC9409 for ADJ
EC9409 Vout R1, R2, Cf Select Table
Vout
3.3V 5V 9V 12V
R1
1.6K 3.6K 6.8K 1.5K
R2
2.7K 11K 43K 13K
Cf (Operational)
33nf 10nf 1.5nf 1nf
EC9409 Typical Application Buck Regulator Design Procedure
Output Voltage
3.3V
Input Voltage
Inductor (L1)
47uh 68uh 33uh 47uh 47uh 47uh 47uh 47uh
Output Capacitor (Cout) Through Hole Electrolytic
6V ~ 18V 6V ~36V
470uf/25V 560uf/25V 330uf/25V 470uf/25V 330uf/25V 470uf/25V 220uf/25V 330uf/25V
5V
8V ~ 18V 8V ~36V
9V
12V ~18V 12V ~36V
12V
15V ~ 18V 15V ~36V
E-CMOS Corp. (www.ecmos.com.tw)
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2007/05/02
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EC9409
2A 150KHz PWM Buck DC/DC Converter
Function Description
+VIN
This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator
Ground
Circuit ground.
Output
Internal switch. The voltage at this pin switches between (+VIN - VSAT) and approximately - 0.5V, with a duty cycle of approximately VOUT / VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept a minimum.
Feedback
Senses the regulated output voltage to complete the feedback loop.
ON/OFF
Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 50uA.Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 32V) shuts the regulator down. If this shutdown feature is not needed, the ON /OFF pin can be wired to the ground pin or it can be left open, in either case the regulator will be in the ON condition.
Thermal Considerations
The EC9409 is available in SOP8/DIP8 package. The SOP8 package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The EC9409 junction temperature rises above ambient temperature for a 2A load and different input and output voltages. The data for these curves was taken with the EC9409 (SOP8/DIP8 package) operating
o as a buck switching regulator in an ambient temperature of 25 C (still air).These temperature rise numbers are all approximate and
there are many factors that can affect these temperatures. Higher ambient temperatures require more heat sinking. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (Once exception to this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board. multi-layer board and the
E-CMOS Corp. (www.ecmos.com.tw)
Page 9 of 11
2007/05/02
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EC9409
2A 150KHz PWM Buck DC/DC Converter
OUTLINE DRAWING FOR SOP8
E-CMOS Corp. (www.ecmos.com.tw)
Page 10 of 11
2007/05/02
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EC9409
2A 150KHz PWM Buck DC/DC Converter
OUTLINE DRAWING FOR DIP8
E-CMOS Corp. (www.ecmos.com.tw)
Page 11 of 11
2007/05/02

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