CM2593/P 2A Step Down VOLTAGE REGULATOR GENERAL DESCRIPTION FEATURES The CM2593/P is a monolithic integrated circuit that ◆ 3.3V, 5V and adjustable output versions provide all the active functions for a step-down ◆ Adjustable version output voltage range, 1.23V to 37V +4% max over line and load condition switching regulator, capable of driving a 2A load without additional transistor component. Requiring a minimum number of external component, the board space can be saved easily. The external shutdown ◆ SOP-8L packages ◆ Voltage mode non-synchronous PWM control ◆ Thermal-shutdown and current-limit protection ◆ ON/OFF shutdown control input function can be controlled by TTL logic level and ◆ Input voltage range up to 40V then internal ◆ Output load current: 2A compensation makes feedback control have good ◆ 150 kHz fixed frequency internal oscillator line and load regulation without external design. ◆ Low power standby mode Regarding protected function, thermal shutdown is ◆ Built-in switching transistor on chip come into standby mode. The to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. The CM2593/P operates at a switching frequency of 150Khz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included fixed 3.3V, 5V, and an adjustable type. The packages are APPLICATIONS Simple High-efficiency step-down(buck) regulator Efficient pre-regulator for linear regulators On-card switching regulators Battery / Car Charger Positive to negative converter Digital Still and Video Cameras available in a standard 8-lead SOP8. TYPICAL APPLICATIONS Figure 1. Basic Application Circuit with CM2593/P fixed version 2007/01/25 Rev. 1.4 Champion Microelectronic Corporation Page 1 CM2593/P 2A Step Down VOLTAGE REGULATOR PIN CONFIGURATION Sop08 Top View(CM2593) Sop08 Top View(CM2593P) BLOCK DIAGRAM 2007/01/25 Rev. 1.4 Champion Microelectronic Corporation Page 2 CM2593/P 2A Step Down VOLTAGE REGULATOR PIN DESCRIPTION Pin No. Symbol Description 1 VIN Operating voltage input 2 Out Switching output 3 FB Output voltage feedback control 4 SD ON/OFF Shutdown GND Ground Pin 5-8 ORDERING INFORMATION CM2593/P X X Lead Free Output Voltage Blank: Normal G: Lead Free package C: Adjustable SC: 3.3V ZJC: 5V X Package Type S: SOP-O8 package ABSOLUTE MAXIMUM RATINGS Symbol Parameter Rating Unit VCC Supply Voltage +45 V VSD ON/OFF Pin input voltage -0.3 to +25 V VFB Feedback Pin voltage -0.3 to +25 V VOUT Output voltage to Ground -1 V PD Power dissipation Internally limited TST Storage temperature W -65 to +150 o o C TOP Operating temperature -40 to +125 VOP Operating voltage +4.5 to +45 V θJa Thermal Resistance 75 °/W θJc Thermal Resistance 14 °/W 2007/01/25 Rev. 1.4 Champion Microelectronic Corporation C Page 3 CM2593/P 2A Step Down VOLTAGE REGULATOR ELECTRICAL CHARACTERISTICS(All Output Voltage Versions) Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version and VIN=24V for the 12V version. ILOAD = 0.2A Symbol IB B FOSC Fscp Parameter Conditions Min. VFB=1.3V Feedback bias current Typ. -10 (Adjustable version only) 150 173 -40℃<=TJ<=125℃ 110 150 173 30 60 1.15 no outside circuit Max. Duty Cycle(ON) VFB=0V force driver on 100 Min. Duty cycle(OFF) VFB=12V force driver off 0 current limit no outside circuit IL Output = 1 IQ 2.4 ISTBY no outside circuit Output leakage VFB=12 force driver off current VIN=24V Quiescent Current VFB=12 force driver off Standby Quiescent ON/OFF pin=5V Current VIN=24V VIL VIH IH Low (regulator ON) ON/OFF pin logic input threshold voltage High (regulator OFF) ON/OFF pin logic 2.8 5 70 - 3.6 2.0 A uA mA 10 150 200 mA uA 0.6 1.3 - -0.01 ON/OFF pin input current VLOGIC=0.5V (ON) -0.1 Ts Over temperature shutdown threshold Tj increasing 175 Tj decreasing 150 Champion Microelectronic Corporation V % -5 IL 2007/01/25 Rev. 1.4 1.5 -200 VLOGIC=2.5V (OFF) input current Khz 3.3 VFB=0 force driver on Output = 0 nA 1.4 peak current ICL Unit Khz VFB=0V force driver on DC -100 127 Oscillator frequency of short When current limit occurred circuit protect and VFB <0.55V saturation voltage -50 TJ=25℃ oscillator frequency IOUT=1.5A VSAT Max. V uA -1 o C Page 4 CM2593/P 2A Step Down VOLTAGE REGULATOR Symbol Parameter Conditions Typ. Limit 5V < VIN < 40V VFB Output Feedback CM2593/P-ADJ 0.2A < ILOAD < 2A V 1.235 VOUT programmed for 3V η VOUT Efficiency Output voltage CM2593/P-3.3V η VOUT Efficiency Output voltage CM2593/P-5V η Efficiency VIN = 12V, ILOAD=2A 5.5V < VIN < 40V 0.2A < ILOAD < 2A VIN = 12V, ILOAD=2A 8V < VIN < 40V 0.2A < ILOAD < 2A VIN = 12V, ILOAD=2A Unit 1.193/1.18 VMIN 1.267/1.28 VMAX 75 3.3 % 3.168/3.135 3.432/3.465 75 5 V VMIN VMAX % 4.8/4.75 5.2/5.25 80 V VMIN VMAX % Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC. 2007/01/25 Rev. 1.4 Champion Microelectronic Corporation Page 5 CM2593/P 2A Step Down VOLTAGE REGULATOR FUNCTIONAL DESCRIPTION Thermal Considerations Pin Functions +VIN This is the positive input supply for the IC switching The SOP-8 package needs a heat sink under most conditions . The size of the heat-sink depends on the regulator. A suitable input bypass capacitor must be input voltage, the output voltage, the load current and the present at this pin to minimize voltage transients and to ambient supply the switching currents needed by the regulator. temperature rises above ambient temperature for a 2A temperature. The CM2593/P junction load and different input and output voltages. The data Out Internal switch and power output. The voltage at this pin switches between (+VIN – VSAT) and approximately – 0.5V, with a duty cycle of approximately VOUT / VIN. The PC board copper area connected to this pin should be kept a minimum in order to reduce the coupling sensitivity to the circuitry for these curves was taken with the CM2593/P (SOP-8 package) operating as a buck switching regulator in an ambient temperature of 25oC (still air). These temperature increments are all approximate and are affected by many factors. Some of these factors include board size, shape ,thickness ,position ,location, and even board temperature. Other factors are trace width, total printed Ground Circuit ground. circuit copper area, copper thickness , single or Feedback Complete the feedback loop by sensing the regulated the board. Higher ambient temperatures require more double-sided, multi-layer board and amount of solder on output voltage heat sinking. For the best thermal performance ,wide copper traces ON /OFF Allows the switching regulator circuit to be shutdown and generous amounts of printed circuit board copper should be used in the board layout. (One exception is the using logic level signals thus dropping the total input out(switch) pin, which should not have large areas of supply current to approximately 100uA. Pulling this pin copper.) Large areas of copper provide the best transfer below a threshold voltage of approximately 1.3V turns of heat(lower thermal resistance) to the surrounding air, the regulator on, and pulling this pin above 1.3V (up to a and moving air lowers the thermal resistance even maximum of 25V) shuts the regulator down. If this further. 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. 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 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. 2007/01/25 Rev. 1.4 Champion Microelectronic Corporation Page 6 CM2593/P 2A Step Down VOLTAGE REGULATOR APPLICATIONS CIRCUIT 470uF/50V 2 CM2593/P VIN 1 1 2 5A/40V 1 2 3 1 L1 68uF 4 VIN GND OUT GND FB GND SD GND 8 7 6 5 Output Voltage Fixed : R1=NC , R2=0 Output Voltage Adj : Vo=Vref*(1+(R2/R1)) Vfb = 1.235V ; R1=1K~5K 2 2 1 220uF/25V 1 VOUT 2 R2 2 1 R1 APPLICATIONS Demo Board Layout TOP Layer BOT Layer Notice : 1. R1/R2 must be close to Pin3 (VFB ), but keep feedback wiring away from inductor. 2. Inductor/diode must be close to Pin2 (Vout ), heavy lines must be keep short and thick . 3. Please to refer to Circuit and Demo Board Layout (the Fig. as above) 2007/01/25 Rev. 1.4 Champion Microelectronic Corporation Page 7 CM2593/P 2A Step Down VOLTAGE REGULATOR DIFFERENT HEATSINK AREA Thermal Resistance vs. Different Cooper Area Layout Design Dog-Bone Layout Minimum Footprint , θJA = 75℃/W 2 Copper Area = 30mm , θJA = 54℃/W 2 Copper Area = 10mm , θJA = 64℃/W 2 Copper Area = 50mm , θJA = 51℃/W 2 Copper Area = 70mm , θJA = 49℃/W 2007/01/25 Rev. 1.4 Champion Microelectronic Corporation Page 8 CM2593/P 2A Step Down VOLTAGE REGULATOR Typical Performance Characteristics (Test Figure 1 above unless otherwise specified) T y p ic a l P e rfo rm a n c e C h a ra c te ris tic s N o rm a lize d O u tp u t V o lta g e Switch Saturation Voltage Efficiency 1.7 1 : -40 oC 2 : 25 o C 3 : 125oC OUTPUT VOLTAGE CHANGE V IN = 20 V , I L O A D = 2 A o N orm alized at TJ = 25 C 2A Load 95 EFFICIENCY (%) 5.0 5 5.0 0 SATURATION VOLTAGE (V) 5 .10 90 5V 85 80 4 .95 1.6 1.5 1.4 1 1.3 2 3.3V 75 3 1.2 4.9 0 -5 0 -25 0 25 50 75 100 70 125 2.0 8 10 15 20 25 30 4 3 5 40 35 SWITCH CURRENT(A) JU N C T IO N T E M P E R A T U R E( o C ) JUNCTION TEMPERATURE(oC) Switch Current Limit Shutdown Quiescent Current Operating Quiescent Current 8.0 200.0 20V 30V 4.0 2.0 130.0 20.0 15.0 CURRENT (uA) VIN =10V SUPPLY CURRENT (mA) 6.0 Switch ON 10.0 Switch OFF 5.0 100.0 1 2 80.0 0 1 2 3 4 5 6 10 0.0 -50 7 Output current Io (A) -25 0 25 50 75 =5 VON/OFF V 1 : -40 oC 2 : 25 oC 3 : 125 oC 3 40.0 0.0 0.0 100 20 30 40 SUPPLY VOLOTAGE (V) 125 JUNCTION TEMPERATURE(oC) ON/OFF Threshold Voltage Minimum Operating Supply Voltage O N /O F F P in C u r r e n t ( S in k in g ) 5.0 THRESHOLD VOLTAGE (V) 5.0 SUPPLY VOLTAGE (V) Output voltage Vo(V) 25.0 4.0 3.0 2.0 1.0 VOUT =1.23V ILOAD =120mA V IN = 4 0 V o - 4 0o C ≤ T J ≤ 1 2 5 C 4.0 3.0 2.0 1.0 1 .4 0.0 0.0 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE ( 2007/01/25 Rev. 1.4 o C) -50 -25 0 25 50 75 100 JUNCTION TEMPERATURE ( o Champion Microelectronic Corporation 125 5 10 15 20 22 23 O N /O F F P IN V O L T A G E (V ) C) Page 9 24 25 CM2593/P 2A Step Down VOLTAGE REGULATOR Switch Frequency Feedback Pin Bias Current 200 100 10 40.0 30.0 20.0 Adjustable Version Only 10.0 50 Output voltage Vo(V) BIAS CURRENT (nA) 150 FREQUENCY (kHz) Thermal protection 50.0 0 25 50 75 4 2 50 -50 -25 -50 -25 6 0 0.0 0.0 8 0 25 50 75 75 100 125 JUNCTION TEMPERATURE( C) 100 125 JUNCTION TEMPERATURE( o C) JUNCTION TEMPERATURE ( C) Light Load operation Heavy Load operation Load step ILoad 1A/DIV Iout Iout Vout ripple 20mV/div Vout 50mV/DIV 0.5ms Vin=12V Vout=5V Iload=0A 0.2ms/div 2007/01/25 Rev. 1.4 175 o o Vout ripple 0mV/div 150 100 125 Vin=12V Vout=5V Iload=2A 5us/div Champion Microelectronic Corporation Vin=12V Vout=5V ILOAD=0ATO2A Page 10 200 CM2593/P 2A Step Down VOLTAGE REGULATOR PACKAGE DIMENSION 8-PIN SOP (S08) PIN 1 ID θ θ 8-Pin SOP w/ Power Pad (PS08) θ θ 2007/01/25 Rev. 1.4 Champion Microelectronic Corporation Page 11 CM2593/P 2A Step Down VOLTAGE REGULATOR IMPORTNT NOTICE Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer’s applications, the customer should provide adequate design and operating safeguards. HsinChu Headquarter Sales & Marketing 5F, No. 11, Park Avenue II, Science-Based Industrial Park, HsinChu City, Taiwan 300 7F-6, No.32, Sec. 1, Chenggong Rd., Nangang District, Taipei City 115, Taiwan R.O.C. T E L : +886-3-567 9979 F A X : +886-3-567 9909 http://www.champion-micro.com T E L : +886-2-2788 0558 F A X : +886-2-2788 2985 2007/01/25 Rev. 1.4 Champion Microelectronic Corporation Page 12