GM7109 GM7109V1.00. Features. Description. Application. Typical Application Circuits. 150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS
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- Bartholomew Byrd
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1 GM709 Description GM709 series is designed to provide all the active function for a step-down (buck) switching regulator, and drives a maximum load current as high as A line and load regulations. GM709 is available in fixed output voltages of., 5, and a versatile Adjustable output version. These regulators are simple to use and require minimum number of external components. The features include internal frequency compensation and a fixed-frequency oscillator. The GM709 is high-efficiency replacements for popular three-terminal linear regulators, and is requiring a smaller heat sink or even no need heat sink. GM709 performs well with standard inductors from most of manufacturers, and simplifying the design of switch-mode power supplies. External shutdown is included with 80 µa (typical) standby current. The output switch has cycle-by-cycle current limiting as well as thermal shutdown for full protection under fault conditions. GM709 operates at a switching frequency of 50 khz which allowing smaller size filter components than what would be needed with lower frequency switching regulators. GM709 series are available in a standard 8-lead SO package or 8 lead SO package with heat sink. Features Standard SOP8 & PSOP8 package., 5, and Adjustable output versions Adjustable version output voltage range. to 7 OUT accuracy is to ±% under specified input voltage the output load conditions Input voltage range up to 0 Requires only external components with High efficiency TTL shutdown capability, low power standby mode Built-in thermal shutdown, current limit protection Uses standard inductors 50 khz fixed frequency internal oscillator Application Pre-regulator for linear regulators High-efficiency step-down buck regulator On-card/board switching regulators Positive to negative converter (buck-boost) LCD Monitors Typical Application Circuits Unregulated DC Input C IN 680µF GM FB Output SD 5, 6, 7, 8 L 68µH D N58 5 regulated output, C OUT 0µF
2 Marking Information and Pin Configurations (Top iew) SO8 & PSO8 GM709 GM709 AYWW OUT SD FB : 0=., 050=5.0, 00A=ADJ A: Assembly / Testing factory code Y: Year WW: Week Ordering Information Ordering Number Output oltage Package Shipping GM709-AS8T Adj SOP8 00 Units / Tube GM709-AS8R Adj SOP8 500 Units / Reel GM709-APS8T Adj PSOP8 00 Units / Tube GM709-APS8R Adj PSOP8 500 Units / Reel GM709-.S8T. SOP8 00 Units / Tube GM709-.S8R. SOP8 500 Units / Reel GM709-.PS8T. PSOP8 00 Units / Tube GM709-.PS8R. PSOP8 500 Units / Reel GM S8T 5.0 SOP8 00 Units / Tube GM S8R 5.0 SOP8 500 Units / Reel GM PS8T 5.0 PSOP8 00 Units / Tube GM PS8R 5.0 PSOP8 500 Units / Reel
3 GM709 Absolute Maximum Ratings (Note ) Rating alue Unit Maximum Supply oltage 5 SD Pin Input oltage / Feed Back Pin oltage Output oltage to Ground (Steady State) Power Dissipation Internally Limited - Thermal Resistance Junction to Ambient (θ JA ) ** square inch of FR-, double sided, oz. minimum copper weight, is recommended 6 /W Storage Temperature Range - 65 to 50 Maximum Junction Temperature + 50 Operating Temperature Range - 0 to 5 Minimum EDS Rating (Note ) k Lead Temperature (Soldering, 0 sec) + 60 Block Diagram SD Source Bias.5 Reference.5 Reference Start UP COMP 0m 0.5 Limit GM COMP A Switch R AMP R =.5K COMP Latch Reset Driver For., R =.K For 5.0, R = 7.6K For Adj, R = 0 and R = OPEN Freq. Shift 50KHz OSC Thermal Limit OUTPUT
4 GM709 Electrical Characteristics: GM709-ADJ (Specifications with standard type face are for T = 5, and those with bold face type apply over full Operating Temperature rage) Parameter Condition Symbol Min Typ Max Unit Output oltage.5 < < 0, 0.A < I LOAD < A OUT Efficiency IN =, ILOAD=.0A, OUT = η 88 % Electrical Characteristics: GM709-. (Specifications with standard type face are for T = 5, and those with bold face type apply over full Operating Temperature rage) Parameter Condition Symbol Min Typ Max Unit Output oltage.75 < < 0, 0.A < I LOAD < A OUT Efficiency IN =, ILOAD=.0A η 7 % Electrical Characteristics: GM (Specifications with standard type face are for T = 5, and those with bold face type apply over full Operating Temperature rage) Parameter Condition Symbol Min Typ Max Unit Output oltage 7 < < 0, 0.A < I LOAD < A OUT Efficiency IN =, ILOAD=.0A η 80 %
5 GM709 Electrical Characteristics: All Output oltage ersions (Specifications with standard type face are for T J = 5, and those with bold face type apply over full Operating Temperature rage. Unless otherwise specified, = ) Parameter Condition Symbol Min Typ Max Unit Feedback Bias Oscillator Frequency Saturation oltage Max Duty Cycle (ON) Min Duty Cycle (OFF) FB =. (Adjustable ersion Only) I b - 0 (Note 6) f o I OUT = A (Notes 7, 8) SAT -.6 (Note 8) DC 00 - % (Note 9) DC 0 % Limit Peak (Notes 7, 8) l CL. A Output Leakage Quiescent Standby Quiescent SD Pin Logic lnput Level SD Pin lnput Output =0 (Notes 7, 9, 0) µa Output = -0.9 (Note 0) l L..5 na khz - - ma (Note 9) l Q ma SD Pin = 5 (OFF), Note 0 l STBY µa Low (ON) IH High (OFF) IL.0. - LOGlC =.5 (OFF) I H 5 5 µa LOGlC = 0.5 (ON) I L µa Note : Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note : The human body model is a 00pF capacitor discharged through a.5kωresistor into each pin. Note : Typical numbers are at 5 C and represent the most likely norm. Note : All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 00% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). Note 5: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the GM709 is used as shown in the Figure test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. Note 6: The switching frequency is reduced when the second stage current limit is activated. Note 7: No diode, inductor or capacitor connected to output pin. Note 8: Feedback pin removed from output and connected to 0 to force the output transistor switch ON. Note 9: Feedback pin removed from output and connected to for the., 5, and the ADJ. version. 5
6 GM709 Test Circuit and Layout Guidelines Careful layout is important with any switching regulators. Rapidly switching currents associated with wiring inductance generate voltage transients which can cause problems. To minimize inductance and ground loops, the lengths of the leads indicated by heavy lines in Figure & below should be kept as short as possible. Single point grounding (as indicated or ground plane construction should be used for best results. When using the Adjustable version, place the programming resistors as close as possible to GM709, to keep the sensitive feedback wiring short. Unregulatedd DC Input C IN 00µF GM709-x.x 5 ~ 8 SD FB OUT D L 00µH C OUT 680µF OUT L O A D Figure Fixed Ouput otlage ersions C IN = 70µF, Aluminum Electrolytic C OUT = 0µF, 5, Aluminum Electrolytic D = Schottky, 5A/0 L = 68µH GM709-A FB L 00µH OUT Unregulatedd DC Input C IN 00µF 5 ~ 8 SD OUT D C OUT 680µF R R L O A D Figure Adjustable Ouput otlage ersions C IN = 70µF, Aluminum Electrolytic C OUT = 0µF, 5, Aluminum Electrolytic D = Schottky, 5A/0 L = 68µH OUT = REF ( + R/R) 6
7 GM709 Typical Performance Characteristics SATURATlON OLTAGE () INPUT - OUTPUT DIFFERENTIAL Figure. Switch Saturation oltage T J = - 0 C 5 C 5 C ln = SWlTCH CURRENT (A) Figure 5. Dropout oltage I LOAD = A L = µh R IND = 0.0 OUT = REG = 50m I LOAD = A JUNCTION TEMPERATURE ( C) SWlTCH CURRENT LlMlT (A) Figure. Switch Limit ln = OUT = JUNCTlON TEMPERATURE ( C) Figure 6. Operating Quiescent SWlTCH CURRENT (ma) Switch ON.5 < < 0 I SWITCH = 0 Switch OFF JUNCTION TEMPERATURE ( C) 5 CURRENT (µa) CURRENT(µA) Figure 7. Shutdown Quiescent Figure 9. SD Pin (Sinking) T J = 5 C ON/OFF = 5 T J = -0 C and 5 C SUPPLY OLTAGE () = 0 T J = -0 C and 5 C SD PlN OLTAGE() Figure 8. Minimum Operating Supply oltage FREQUENCY (khz) SUPPLY OLTAGE () 5 OUT =. I LOAD = 0mA JUNCTION TEMPERATURE ( C) Figure 0. Switching Frequency JUNCTION TEMPERATURE ( C) 7
8 GM709 Package Outline Dimensions SO ( ) ( ) ( ) D ( ) (.70) TYP ( ) SEATING PLAN ( ) ( ) ( ) 8.0 MAX Package Outline Dimensions PSO ( ) (.86) ( ) ( ) ( ) D ( ) (.70) TYP ( ) 8 SEATING PLAN ( ) ( ) ( ) 8.0 MAX
9 Ordering Number GM709 GM 709 A S8 R APM Gamma Circuit Type Output oltage Package Type Shipping Type Micro A: Adj. =. 5.0 =5.0 S8: SO 8 PS8: Power SO 8 R: Taping & Reel T: Tube
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