34652_07 FREESCALE | Alldatasheet
Document overview
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Technical content
Features
- Integrated Power MOSFET and Control IC in a Small Outline Package
- Input Voltage Operat ion Range from -15 V to - 80 V
- Programmable Overcurrent Limit with Auto Retry
- Programmable Charging Current Limit Independent of Load Capacitor
- Programmable Start-Up and Retry Delay Timer
- Programmable Overvoltage and Undervoltage Detection
- Active High and Low Power Good Output Signals
- Thermal Shutdown
- Pb-Free Packaging Designated by Suffix Code EF
Figure 1. 34652 Simplified Application Diagram
ORDERING INFORMATION
Range (TA) Package MC34652EF/ R2 - 40°C to 85°C 16 SOICN MCZ34652EF/ R2 SCALE 2:1 EF SUFFIX (PB-Free) 98ASB42566B 16-PIN SOICN 34652 DISABLE VPWR UV OV ICHG ILIM VIN VOUT PG PG TIMER GND -48 V System Power Supply (Backplane) Optional External Components Optional External Components Load Application Dependent
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Figure 2. 34652 Simplified Internal Block Diagram
Figure 3. 16-SOICN Pin Connections Table 1. 16-SOICN Pin Definitions A functional description of each pin can be found in the FUNCTIONAL PIN DESCRIPTION section beginning on page 10.
2 PG Power Good Output
This is an active high power good output signal. This pin is referenced to VIN.
3 PG Power Good Output
This is an active low power good output signal. This pin is referenced to VIN.
6 TIMER Start-Up and Retry
start-up and the retry delay when the device experiences any fault. 7 NC No Connect Not connected. 10 OV Overvoltage Control This pin is used to set the upper limit of the input voltage operation range. 11 UV Undervoltage Control This pin is used to set the lower limit of the input voltage operation range.
12 VPWR Positive Supply
cause a “Power No Good” signal. This pin is referenced to VPWR. 14 ILIM Current Limit Control This pin is used to set the overcurrent limit during normal operation.
15 ICHG Charging Current
inrush current to a known constant value.
Analog Integrated Circuit Device Data
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ELECTRICAL CHARACTERISTICS
Table 2. Maximum Ratings permanent damage to the device.
- Refer to the section titled Power MOSFET Energy Capability on page 23 for a detailed explanation on this parameter.
- Continuous output current capability so long as T J is ≤ 160°C.
- ESD1 testing is performed in accor dance with the Human Body Model (CZAP = 100pF, RZAP = 1500 Ω), ESD2 testing is performed in
accordance with the Machine Model (CZAP = 200 pF, RZAP = 0 Ω).
- The limiting factor is junction temperature, taking into account power dissipation, thermal resistance, and heatsinking.
Analog Integrated Circuit Device Data Freescale Semiconductor 5 34652 Peak Package Reflow Temperature During Reflow (5), (6) TPPRT Note 6 °C Thermal Resistance (7) , (8) Junction-to-Ambient, Single-Layer Board (9) Junction-to-Ambient, Four-Layer Board (10) RθJA RθJMA 103 °C/W Notes 5. Pin soldering temperature limit is for 10 seconds maximum dura tion. Not designed for immersion soldering. Exceeding these limits may cause malfunction or permanent damage to the device. 6. Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow Temperature and Moisture Sensitivity Levels (MSL), MC33xxxD enter 33xxx), and review parametrics. 7. Refer to the section titled Thermal Shutdown on page 16 for more thermal resistance values under various conditions. 8. The VOUT and VIN pins comprise the main heat conduction paths. 9. Per SEMI G38-87 and JEDEC JESD51-2 with th e single-layer board (JESD51-3) horizontal. 10. Per JEDEC JESD51-6 with the board (JESD51-7) horizontal. T here are no thermal vias connecting the package to the two planes in the board. Table 2. Maximum Ratings (continued) permanent damage to the device.
Analog Integrated Circuit Device Data
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STATIC ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 3. Static Electrical Characteristics
- The supply current depends on operation mode and can be calculated as follows:
- Start-Up Mode: IIN = 539 µA + 548 µ * ICHG(A) + 216 µ * ILIM(A) + VPWR(V) / 460(kΩ)
- Normal Mode: IIN = 539 µA + 240 µ * ILIM(A) + 288 µ * ILOAD(A) + VPWR(V) / 460(kΩ)
- Overcurrent Mode: IIN = 539 µA + 612 µ * ILIM(A) + VPWR(V) / 460(kΩ)
- Disable Mode: IIN = 539 µA + 240 µ * ILIM(A) + IDIS(µA) + VPWR(V) / 460(kΩ)
Analog Integrated Circuit Device Data Freescale Semiconductor 7 34652 STATIC ELECTRICAL CHARACTERISTICS DISABLE INPUT CONTROL PIN (DISABLE) (12) DISABLE Input Voltage Inactive State Active State, Positive Signal Active State, Negative Signal VDISL VDISHP VDISHN VPWR - 1.2 VPWR + 2.0 VPWR + 1.2 VPWR - 2.0 V DISABLE Input Current VDIS = VPWR + 3.3 V VDIS = VPWR - 3.3 V VDIS = VIN IDIS -20 - 50 - 60 -150 180 -180 - 250 µA CURRENT LIMIT CONTROL PINS (ILIM, ICHG) Overcurrent Limit in Steady State Default Maximum with External Resistor Minimum with External Resistor ILIM 1.0 2.25 0.35 A Current Limit During Start-Up Default Maximum with External Resistor Minimum with External Resistor ICHG 0.1 0.5 0.05 A Short Circuit Current Limit ISHORT — 5.0 — A ILIM Current Limit Hysteresis ILIMHY — 12 — % ILIM Current Limit Accuracy ILIMCLA -20 — 20 % ICHG Current Limit Accuracy ICHGCLA - 35 — 35 % ILIM Pin Voltage VILIM — 3.1 — V ILIM to RILIM Setting Constant ILIMCNS — 129 — A * kΩ ICHG Reference Current ICHGOUT — - 8.0 — µA ICHG to RICHG Setting Constant ICHGCNS — 335 — kΩ/A POWER GOOD OUTPUT PINS (PG, PG) (13) Power Good Output Low Voltage IPG or IPG = 1.6 mA VPGL — — 0.5 V Power Good Leakage Current IPGLG — — 10 µA Power Good Current Limit VPG or VPG = 3.0 V IPGCL — — 7.0 mA Notes 12. Referenced to VPWR. 13. Referenced to VIN. Table 3. Static Electrical Characteristics (continued)
Analog Integrated Circuit Device Data
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STATIC ELECTRICAL CHARACTERISTICS START-UP AND RETRY DELAY TIMER (TIMER) TIMER Pin Voltage VTIMER — 1.3 — V OUTPUT VOLTAGE PIN (VOUT) VOUT Leakage Current IOUTLG — — 50 µA POWER MOSFET ON Resistance @ 25°C RDS(ON) — 144 — mΩ THERMAL SHUTDOWN Thermal Shutdown Temperature TSD — 160 — °C Thermal Shutdown Temperature Hysteresis TSDHY — 25 — °C
Analog Integrated Circuit Device Data Freescale Semiconductor 9 34652 DYNAMIC ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS Table 4. Dynamic Electrical Characteristics
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current to the filter capacitor if a hot swap device is absent. Figure 4. Circuit Board Insertion Without a Figure 5. Circuit Board Insertion With the Hot Swap and central office switching. pins except the DISABLE pin are referenced to this input.
- Power is turned off.
- The device is disabled for more than 1.0 ms.
- The device exceeded its thermal shutdown threshold for more than 12 µs.
- The device is in overvoltage or undervoltage mode for more than 1.0 ms.
- Load current exceeded the overcurrent limit for more than 3.0 ms. This pin is referenced to VIN.
Analog Integrated Circuit Device Data Freescale Semiconductor 11 34652 FUNCTIONAL DESCRIPTION FUNCTIONAL PIN DESCRIPTION POWER GOOD OUTPUT (ACTIVE LOW) (PG) The PG pin is the active low power good output signal that is used to enable or disable a load. This signal goes active after a successful power-up sequence and stays active as long as the device is in normal operation and is not experiencing any faults. The signal is deactivated under the following conditions:
- Power is turned off.
- The device is disabled for more than 1.0 ms.
- The device exceeded its thermal shutdown threshold for more than 12 µs.
- The device is in overvoltage or undervoltage mode for more than 1.0 ms.
- Load current exceeded the overcurrent limit for more than 3.0 ms. This pin is referenced to VIN. OUTPUT VOLTAGE (VOUT) The VOUT pin is the drain of the internal Power MOSFET and supplies a current-limited voltage to the load. The load connects between the VOUT and VPWR pins. START-UP AND RETRY DELAY TIMER (TIMER) This input is used to control the time-base used to generate the timing sequences at start-up and the retry delay when the device experiences any fault. The TIMER pin can be left unconnected for a default timer value of 200 ms or the user can connect a resistor between this pin and the VIN pin to set the timer value externally. The timer value can vary between 100 ms and 1000 ms. OVERVOLTAGE CONTROL (OV) The OV pin is used to set the upper limit of the input voltage operation range. If the OV pin voltage goes above the overvoltage threshold value, the device turns off the internal Power MOSFET and deactivates the two power good outputs, PG and PG. The Power MOSFET stays off until the OV drops below the threshold value. The overvoltage detection circuit has a 1.0 ms filter timer. The OV pin can be left unconnected for the typical default threshold value of 78 V or the user can set the threshold value externally with a simple voltage divider using resistors between the VPWR and VIN pins. UNDERVOLTAGE CONTROL (UV) The UV pin is used to set the lower limit of the input voltage operation range. If the UV pin voltage goes below the undervoltage threshold value, the device turns off the internal Power MOSFET and deactivates the two power good outputs, PG and PG. The Power MOSFET stays off until the UV rises above the threshold value. The undervoltage detection circuit has a 1.0 ms filter timer. The UV pin can be left unconnected for the typical default threshold value of 37 V or the user can set the threshold value externally with a simple voltage divider using resistors between the VPWR and VIN pins. POSITIVE SUPPLY VOLTAGE INPUT (VPWR) The VPWR pin is the most-positive power supply input. The load connects between the VPWR and VOUT pins. DISABLE INPUT CONTROL (DISABLE) The DISABLE pin is used to easily disconnect or connect the load from the main power line by disabling or enabling the 34652. It can also be used to reset the fault conditions that cause a “Power No Good” signal. If left open or connected to VPWR, the DISABLE pin is inactive and the device is enabled. If a positive voltage (above VPWR) or a negative voltage (below VPWR) is applied to DISABLE, it is active and the device is disabled. The disable function has a 1.0 ms filter timer. This pin is referenced to VPWR. CURRENT LIMIT CONTROL (ILIM) The ILIM pin is used to set the overcurrent limit during normal operation. This pin can be left unconnected for a default overcurrent limit value of 1.0 A or the user can connect an external resistor between the ILIM and VIN pins to set the overcurrent limit value. This value can vary between 0.35 A and 2.25 A. The overcurrent detection circuit has a 100 µs filter timer. CHARGING CURRENT LIMIT CONTROL (ICHG) The ICHG pin is used to set the current limit that is used to charge the load’s input capacitor, hence limiting the inrush current to a known constant value. This pin can be left unconnected for a default charging current limit value of 0.1 A and a default ICHG rise time of 1.0 ms. Or the user can connect an external resistor between the ICHG and VIN pins to set the current limit value between 0.05 A and 0.5 A and an
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MOSFET will stay off until the start of the charging process. Current Limit, and the Overvoltage Threshold, respectively. continuously throughout the operation. the device must be disabled to reset the retry counter. Figure 6. Start-Up Sequence
- Input voltage is below the overvoltage turn-off threshold. This threshold is either a default or user-programmable value.
- Input voltage is above the undervoltage turn-off threshold. This threshold is either a default or user-programmable value.
- Die temperature is less than thermal shutdown temperature.
- Device is enabled. If the start-up conditions are satisfied for a time equal to the length of the start-up timer and the retry counter is less than or equal to 10, the device starts to turn on the Power MOSFET gradually to control the inrush current that charges up the load capacitor to eventually switch on the load (Point B in Figure 6). Charging Process When charging a capacitor from a fixed voltage source, a definite amount of energy will be dissipated in the control circuit, no matter what the control algorithm is. This energy is equal to the energy transferred to the capacitor — ½ CV 2. With this in mind, the Power MOSFET in the 34652 cannot absorb this pulse of energy instantaneously, so the pulse must be dissipated over time. To limit the peak power dissipation in the Power MOSFET and to spread out the
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Figure 10. Overcurrent Mode for Less Than 3.0 ms pattern outlined in the Overcurrent Mode paragraph above. Figure 11. Disabling and Enabling the 34652 Charging Process section, pages 12–13). Figure 12. Start-Up Timer Versus Disable
34652 STATE MACHINE DIAGRAM
different modes of operation. Figure 13. State Diagram Figure 14. Undervoltage Fault Followed by a
- Thermal Shutdown < 160°C Filter = tTIMER
- VPWR > VUV(OFF)
- VPWR < VOV(OFF) N = N + 1
- DISABLE = 0
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Charging Process, pages 12–13). Figure 15. Start-Up Timer Protection Against Figure 16. Overvoltage Fault Power MOSFET and circuitry from excessive temperatures. below 135°C, a new start-up sequence will not be initiated. Thermal design is critical to proper operation of the 34652.
- The ambient operating temperature (T A).
- The type of PC board—whether it is single layer or multi- layer, has heat sinks or not, etc.—all of which affects the value of the junction-to-ambient thermal resistance (RθJA).
- The value of the desired load current (I LOAD). When choosing an overcurrent limit, certain guidelines need to be followed to make sure that if the load current is running close to the overcurrent limit the 34652 does not go into thermal shutdown. It is good practice to set the parameters so that the resulting maximum junction temperature is below the thermal shutdown temperature by a safe margin. Equation 1, on the following page can be used to calculate the maximum allowable overcurrent limit based on the maximum desired junction temperature or vice versa.
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Figure 18. Typical Application Diagram with Default Figure 19. Typical Application Diagram with External
should be 1% or better to get an accurate reading. Note Accuracy requirements are application dependent. same argument applies to the UV pin. pins and VPWR pin is 500 kΩ. and the closest 1% standard resistor value is 8.66 kΩ. and the closest 1% standard resistor value is 7.15 kΩ. points of the UV and OV thresholds independently. any external components to determine the value of the timer. used when initiating a start-up sequence. Note Accuracy requirements are application dependent. Table 6. RTIMER Values for Some Desired t TIMER Values
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Figure 20. External Resistor (RTIMER) Value Versus active high and active low power good output signals. operation. The signal goes active after a typical 20 ms delay.
- Power is turned off.
- The device is disabled for more than 1.0 ms.
- The device exceeded its thermal shutdown threshold for more than 12 µs.
- The device is in overvoltage or undervoltage mode for more than 1.0 ms.
- Load current exceeded the overcurrent limit for more than 3.0 ms. When the power good output signal becomes inactive, it disables the load, protecting it from any faults or damage. These loads are usually DC/ DC converters, depicted in Figure 19, page 18. An LED can also be connected to PG to indicate that the power is good. The PG and PG pins are referenced to VIN and require a pull-up resistor connected to VPWR (Figures 18 and 19, page 18). DISABLING AND ENABLING THE 34652 The Disable control input (DISABLE) provides two functions:
- External enable/disable control.
- Manual resetting of the device and the retry counter after a fault has occurred. Using the DISABLE pin, a user can enable /disable the 34652 device, which facilitates easy access to connect the load to or disconnect it from the main power rail. When power is first applied, the DISABLE pin must be inactive in order for the 34652 to initiate a start-up sequence. If the DISABLE pin is active, the device makes no further steps until the pin is inactive. If the DISABLE pin is activated at any point during the start-up and thereafter during normal operation, then the retry counter resets, the Power MOSFET turns off, and the power good output signals deactivate. The DISABLE circuit is equipped with a 1.0 ms filter to filter out any glitches or transients on the DISABLE input and prevent the Power MOSFET from turning off prematurely. The DISABLE pin is referenced to VPWR . If left open or connected to VPWR, meaning the voltage at the DISABLE pin is between VPWR + 1.2 V and VPWR - 1.2 V, it is inactive and the device is enabled. If a positive voltage (1.8 V above VPWR) or a negative voltage (1.8 V below VPWR) is applied to DISABLE, it is active and the device is disabled. CHARGING CURRENT LIMIT When the device passes the UVLO threshold, it checks if there is any external resistor or external capacitor connected to the ICHG pin. If there is, then it determines the value of the charging current limit value and the charging current limit rise time accordingly. If there is not, it uses the default charging current limit value of 100 mA and rise time of 1.0 ms. Note Users are allowed to connect an external capacitor to the ICHG pin only if an external resistor is also connected. During the external components’ check, a capacitor produces an impulse of current and an external resistor will be detected, even it the external resistor is absent. When the Power MOSFET is turned on, the current limit is set gradually from 0 A to ICHG. This current charges up the load capacitor relatively slowly. When the load capacitor is fully charged, the Power MOSFET reaches its full enhancement, which triggers the current limit to change from I CHG to ILIM and the load current to decrease. The power good output signals activate after a 20 ms delay, which in turn enables the load. The 34652 is now in normal operation mode and the retry counter resets. 100 150 200 250 300 350 400 450 500 550 0 200 400 600 800 1000 1200 ttimer (ms ) Rtimer (kohm)rRTIMER (kΩ) tTIMER (ms)
Note Accuracy requirements are application dependent. Table 7. RICHG Values for Some Desired ICHG Values Figure 21. External Resistor (RICHG ) Value Versus plot of CICHG versus t ICHGR. Table 8. CICHG Values for Some Desired t ICHGR Values
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Figure 22. Charging Current External Capacitor (CICHG) there is not, it uses the default overcurrent limit value of 1.0 A. resistor value to the actual value be chosen. Note Accuracy requirements are application dependent. Figure 23. External Resistor (RILIM) Value Versus Table 9. RILIM Values for Some Desired ILIM Values
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Important For the most current revision of the package, visit www.freescale.com and perform a keyword search on the “98A” drawing number below: EF SUFFIX (Pb-Free) 16-PIN SOIC NARROW BODY PLASTIC PACKAGE 98ASB42566B ISSUE M
Analog Integrated Circuit Device Data Freescale Semiconductor 25 34652
REVISION HISTORY
REVISION DATE DESCRIPTION OF CHANGES 6.0 2/2006 • Changed Document Order No. 7.0 6/2006 • Changed Max on DISABLE Input Current
- Changed Overcurrent Limit in Steady State and in the text on page 11 and page 22
- Updated PACKAGE DIMENSIONS on page 24 8.0 2/2007 • Updated to the current Freescale format and style
- Added Part Number MCZ34652 in the Ordering Information
- Removed Peak Package Reflow Temperature During Reflow (solder reflow) parameter from Maximum Ratings on page 5.
- Added Note Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow Temperature and Moisture Sensitivity Levels (MSL), Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes and enter the core ID to view all orderable parts. (i.e. MC33xxxD enter 33xxx), and review parametrics. on page 5
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