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| Impala Linear Corporation ILC7526/7536 Final USB Dual Control Switches General Description The ILC7526 contains dual high side power control switches, with independent enable and flag functions, integrated into a single 8-pin SOIC package. With just a few external components, the ILC7526 can be easily configured to meet requirements for either self powered or bus powered USB (Universal Serial Bus) applications. The ILC7526 has active high ENABLE inputs, while the ILC7536 ENABLE inputs are active low. With a maximum RDSON value of 140m per switch, the USB voltage drop requirements can be achieved. Each switch can also supply up to 500mA, with internal circuitry limiting the fault current to 750mA. Fault conditions are also reported to the USB controller via one of the independent flag pins. Internal circuitry provides a soft-start that eliminates momentary upstream voltage drops when the switch is enabled, especially in bus powered applications. Additional features include undervoltage lockout (2.4V), fast turn-off, 2.8V to 5.8V input voltage range, thermal shutdown to prevent switch failure from high current loads, and 3.3V and 5V logic compatible enable inputs. The ILC7526 and ILC7536 are available in both 8-pin SOIC and 8-pin mini-DIP packages. * * * * * * * * * * * * * * * Features 2 independent switches with ENABLE and FLAG 500mA continuous load current per switch (channel) 140m maximum RDSON (switch on-resistance) 1.25A maximum short circuit current limit Thermal shutdown 110A typical on-state supply current 0.75A typical off-state supply current 2.4V typical undervoltage lockout 2.8V to 5.8V input voltage range 1 ms turn-on (soft-start) Fast turn-off Outputs can be forced higher than inputs (off-state) USB specification compliant Active-high or active-low ENABLE versions 8-pin SOIC or 8-pin mini-DIP packages Applications * USB host and self powered hubs * USB bus-powered hubs * USB monitors, printers, cameras and other USB controlled peripherals * Hot plug-in power supplies * Battery charger circuits Ordering Information* (TA = -40C to =85C) ILC7526-IK ILC7526-IN ILC7536-IK ILC7536-IN 100k 100k Active High Enable, SO-8 package Active High, DIP-8 package Active Low, SO-8 package Active Low, DIP-8 package VCC 5.0V 100k VBUS 100k D+ DGND 4.5V to 5.25V Upstream VBUS 100mA max VBUS D+ DGND + ILC7082-3.3 IN 1F OUT GND 1F 3.3V USB Controller VIN ON/OFF OVERCURRENT OVERCURRENT ON/OFF ILC7526 ENA FLGA FLGB ENB OUTA IN 47F 0.1F GND OUTB 47F VBUS D+ DGND + Data Data (Two Pair) to USB Controller Impala Linear Corporation ILC7526/7536 1.5 (408) 574-3939 www.impalalinear.com Dec 2000 1 USB Dual Control Switches Preliminary Figure 2: Pin Configuration ENA FLGA FLGB ENB 1 2 3 4 8 OUTA 7 IN 6 GND 5 OUTB Pin Number 1 2 3 4 5 6 7 8 Pin Name ENA FLGA FLGB ENB OUTB GND IN OUTA Pin Description Enable A (input): Logic-compatible enable input. (7526 active-high, 7536 active-low). Do not float. Fault Flag A (Output): Active-low, open-drain output. Indicates overcurrent, UVLO, or thermal shutdown. Fault Flag B (Output): Active-low, open-drain output. Indicates overcurrent, UVLO, or thermal shutdown. Enable B (Input): Logic-compatible enable input. (7526 active-high, 7536 active-low). Do not float. Switch Output B: Output MOSFET source. Typically connect to switched side of load. Ground: Supply return. Supply Input: Output MOSFET drain. Also supplies IC's internal circuitry. Connect to positive supply. Switch Output A: Output MOSFET source. Typically connect to switched side of load. ILC7526 (OUTA)8 (ENA)1 (FLGA)2 (FLGB)3 (ENB)4 LOGIC CHARGE PUMP (IN)7 LOGIC CHARGE PUMP (OUTB)5 (GND)6 Impala Linear Corporation ILC7526/7536 1.5 (408) 574-3939 www.impalalinear.com Dec 2000 2 USB Dual Control Switches Absolute Maximum Ratings (Note 1, notes on next page) Parameter Input Supply Voltage Fault Flag Voltage Fault Flag Current Output Voltage Output Current ENABLE Input Voltage Storage Temperature Operating Ambient Temperature Package Thermal Resistance SOIC 8-Pin DIP Lead Temperature (soldering 5 sec) Symbol VIN VFLG IFLG VOUT IOUT VEN TSTG TA JA JA Ratings +6 +6 50 +6 Internally Limited -0.3 to +12 -40 to +125 -40 to +85 120 130 260 Preliminary Units V V mA V mA V C C C/W C/W C Electrical Characteristics ILC7526IK Test circuit shown in Fig. 2. BOLDFACE type indicates limits that apply over the full operating temperature range (Note 2). Parameter Supply Current ENABLE Input Threshold ENABLE Input Current ENABLE Input Capacitance Switch resistance Output Turn-on Delay Output Turn-on Rise Time Output Turn-off Delay Output Turn-off Fall Time Output Leakage Current Continuous Load Current Short Circuit Current Limit Current Limit Threshold Over Temperature Shutdown Threshold Error Flag Output Resistance Error Flag Off Current Under Voltage Lockout Threshold Impala Linear Corporation ILC7526/7536 1.5 Symbol ISS VENTH IEN CEN RDSON TON TOR TOFD TOFF IOL IOUT ISCL ILTH OTTH RFLG IFLG UVLO Conditions Switch off, OUT = Open All switches on, OUT = Open Low to high transition High to low transition (Note 3) VEN = 0V to 5.8V VIN = 5V, IOUT = 500mA each switch VIN = 3.3V, IOUT = 500mA each switch RL = 10 each output RL = 10 each output RL = 10 each output RL = 10 each output Output disabled, each output Each output ENABLE into load, VOUT = 4.0V Ramped load to enabled output VOUT < 4.0V, Note 2 TJ (Junction temperature) increasing TJ (Junction temperature) decreasing VIN = 5V, IL = 10mA VIN = 3.3V, IL = 10mA VFLG = 5V VIN = increasing VIN = decreasing www.impalalinear.com Min Typ 0.75 110 Max Units A A V V A pF 0.8 -1 2.1 1.9 +0.01 1 100 140 0.5 1 1 1 2.4 1 140 180 m m ms ms s s A A A A C C 20 20 10 0.5 0.5 0.75 1.6 135 125 10 15 0.01 2.5 2.3 Dec 2000 25 40 1 1.25 2.2 A V (408) 574-3939 3 USB Dual Control Switches Preliminary Note 1. Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. Operating ranges define those limits between which the functionality of the device is guaranteed. Note 2. Specified min/max limits are production tested or guaranteed through correlation based on statistical control methods. Measurements are taken at constant junction temperature as close to ambient as possible using low duty pulse testing. Note 3. Off is < 0.8V and On is > 2.4V for the ILC7526. Off is > 2.4V for the ILC7536. The enable input has approximately 200mV of hysteresis. 5V 0.1F 10k ILC7526 ENA FLGA FLGB ENB OUTA IN GND OutB CL + IOUT (1 output shown) RL Functional Description The ILC7526 and ILC7536 are dual high-side switches with active-high and active-low enable inputs, respectively. Fault conditions turn-off or inhibit turn-on of one or more of the output transistors, depending upon the type of fault, and also activate the open-drain error flag transistors which sink current to ground. Input and Output IN (input) is the power supply connection to the logic circuitry and the drains of both of the output MOSFET's. OUTx (output) is the source of each MOSFET. In a typical circuit, current flows through the switch from IN to OUT toward the load. If VOUT is greater than VIN when a switch is enabled, current will flow from OUT to IN since the MOSFET is bidirectional when on. The output MOSFET and driver circuitry are also designed to allow the MOSFET source to be externally forced to a higher voltage than the drain (VOUT > VIN) when the output is off. In this situation, the ILC7526 avoids undesirable current flow from OUT to IN. If VIN < 2.5V, UVLO disables both switches. Thermal Shutdown Thermal shutdown shuts off the affected output MOSFET's and signals all fault flags if the die temperature exceeds 135C. 10C of hysteresis prevents the switch from turning on until the die temperature drops to 125C. Overtemperature detection functions only when at least one switch is enabled. Current Limit Induced Thermal Shutdown Internal circuitry increases the output MOSFET on-resistance until the series combination of the MOSFET on-resistance and the load impedance limit current to typically 850mA. The increase in power dissipation, in most cases, will cause the ILC7526 to go into thermal shutdown, disabling affected channels. When this is undesirable, thermal shutdown can be avoided by externally responding to the fault and disabling the current limited channel before the shutdown temperature is reached. The delay between the flag indication of a current limit fault and thermal shutdown will vary with ambient temperature, board layout, and load impedance, but is typically several hundred milliseconds. The USB controller must therefore recognize a fault and disable the appropriate channel within this time. If the fault is not removed or the switch is not disabled within this time, the device will enter into a thermal oscillation of about 2Hz. This does not cause any damage to the device. Impala Linear Corporation ILC7526/7536 1.5 (408) 574-3939 www.impalalinear.com Dec 2000 4 USB Dual Control Switches Preliminary Undervoltage Lockout UVLO (undervoltage lockout) prevents the output MOSFET from turning on until VIN exceeds approximately 2.5V. In the undervoltage state, the FLAG will be low. After the switch turns on, if the voltage drops below approximately 2.3V, UVLO shuts off the output MOSFET and signals fault flag. Undervoltage detection functions only when at least one switch is enabled. Current Sensing and Limiting The current-limit threshold is preset internally. The preset level prevents damage to the output MOSFET and external load but allows a minimum current of 0.5A through the output MOSFET of each channel. The current-limit circuit senses a portion of the output FET switch current. The reaction to an overcurrent condition varies with three scenarios: Switch Enabled into Short Circuit If a switch is powered on or enabled into a heavy load or short circuit, the switch immediately goes into a constantcurrent mode, reducing the output voltage. The fault flag goes low until the load is reduced. Short Circuit Applied to Output When a heavy load is applied, a large transient current may flow until the current limit circuitry will respond. Once this occurs, the device limits current to less than the short-circuit current limit specification. Current-Limit Response The ILC7526 current-limit profile exhibits a small foldback effect of approximately 500mA. Once this current-limit threshold is exceeded the device enters constant-current mode. This constant current is specified as the short circuit current limit in the "Electrical Characteristics" table. it is important to note that the device will deliver load current up to the current-limit threshold which is typically 1.6A Fault Flag FLG is an N-channel, open-drain MOSFET output. The faultflag is active (low) for one or more of the following conditions: undervoltage (while 2V < VIN < 2.7), current limit, or thermal shutdown. The flag output MOSFET is capable of sinking a 10mA load to typically 100mV above ground. Multiple FLG pins may be wired "NORed" to a common pull-up resistor. APPLICATIONS INFORMATION Supply Filtering A 0.1F to 1F bypass capacitor from IN to GND, located at the device, is strongly recommended to control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. Input or output transients must not exceed the absolute maximum output supply voltage (VIN MAX = 6V) even for a short duration. 3.0V to 5.5V ILC7526 ENA FLGA FLGB ENB OUTA IN GND OutB 0.1F to 1F Enable Input EN must be driven logic high or logic low for a clearly defined input. Floating the input may cause unpredictable operation. EN should not be allowed to go negative with respect to GND. Soft-Start The ILC7526 presents a high impedance when off, and slowly becomes a low impedance as it turns on. This reduces in rush current and related voltage drop that results from charging a capacitive load, satisfying the USB voltage drop requirements for bus-powered applications. Impala Linear Corporation ILC75267536 1.5 (408) 574-3939 www.impalalinear.com Dec 2000 5 USB Dual Control Switches Package Dimensions All dimensions in inches 8-Pin SOIC 0.197 0.190 Preliminary Pin 1 identifier 0.155 0.150 0.244 0.228 0.069 0.053 0.060 0.040 0.019 0.013 0.012 0.009 0.8 0.011 0.004 0.050 0.016 8-Pin DIP 0.019 0.013 0.260 0.240 0.260 0.240 0.260 0.240 0.260 0.240 0.260 0.240 0.260 0.240 0.260 0.240 0.260 0.240 Devices sold by Impala Linear Corporation are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Impala Linear Corporation makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Impala Linear Corporation makes no warranty of merchantability or fitness for any purpose. Impala Linear Corporation reserves the right to discontinue production and change specifications and prices at any time and without notice. This product is intended for use in normal commercial applications. Applications requiring an extended temperature range, unusual environmental requirements, or high reliability applications, such as military and aerospace, are specifically not recommended without additional processing by Impala Linear Corporation. Impala Linear Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in an Impala Linear Corporation product. No other circuits, patents, licenses are implied. Life Support Policy Impala Linear Corporation's products are not authorized for use as critical components in life support devices or systems. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. Impala Linear Corporation ILC7526/7536 1.5 (408) 574-3939 www.impalalinear.com Dec 2000 6 |
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