G526 Global Mixed-mode Technology Inc. Dual USB High-Side Power Switch Features Description Compliant to USB specifications Low MOSFET on resistance at 5.0V 140mΩ Ω max. The G526 is a dual integrated high-side power switch with independent enable and flag functions, optimized for self-powered and bus-powered Universal Serial Bus (USB) applications. per channel 500mA minimum continuous load current per channel The G526 satisfies the following USB requirements: the switch's low on-resistance meets USB voltage drop requirements; fault current is limited to typically 750mA, well below the UL 25VA safety requirement; and flag outputs are available to indicate fault conditions to the local USB controller. Soft start eliminates the momentary voltage drop on the upstream port that may occur when the switch is enabled in bus-powered applications. 3.0V to 5.5V input 110µA typical on-state supply current 1µA typical off-state supply current Output can be forced higher than input (off-state) 1.25A maximum current limit Thermal shutdown 2.4V typical undervoltage lockout (UVLO) Open-drain fault flag pins 1ms turn-on (soft-start) and fast turnoff with active-high or active-low Available enable Additional features include thermal shutdown to prevent catastrophic switch failure from high-current loads, under-voltage lockout (UVLO) ensuring that the device remains off unless there is a valid input voltage present, and an enable input that is compatible with both 3.3V and 5V logic. Applications USB host and self-powered hubs Bus-powered hubs Hot plug-in power supplies Battery-charger circuits The G526 is available in active-high and active-low enable versions in 8-pin SOIC packages. Ordering Information PART G526-1 G526-2 ENABLE TEMP. RANGE PACKAGE Active High Active Low －40°C to ＋85°C －40°C to ＋85°C 8-Pin SOP 8-Pin SOP Pin Configuration G526 G526 ENA 1 8 8(OUTA) OUTA (ENA)1 FLGA 2 7 IN FLGB 3 6 GND ENB 4 5 OUTB (FLGA)2 GATE CONTROL 7 (IN) (FLGB)3 (ENB)4 GATE CONTROL 5 (OUTB) 8 Pin SOP 6 (GND) TEL: 886-3-5788833 http://www.gmt.com.tw Ver 1.0 Dec 26, 2000 1 G526 Global Mixed-mode Technology Inc. Absolute Maximum Ratings Operating Ratings Supply Voltage (VIN)..…………………..………….+6.0V Fault Flag Voltage (VFLG)..………………………..+6.0V Fault flag current (IFLG)..……….………………….50mA Output Voltage (VOUT)..…….……………..….…..+6.0V Output Current (IOUT)………………...Internally Limited Control Input (VEN).…………………….……-0.3V to 6V Storage Temperature (TS)…………….-65°C to +150°C Lead Temperature (Soldering 5 sec.)……..…..…260°C ESD protection…………………………………..……2KV Supply Voltage (VIN).……………………...+3V to +5.5V Ambient Operating Temperature (TA)…-40°C to +85°C Thermal Resistance SOIC (θJA)………………….……………….160°C/W Electrical Characteristics(VIN=+5V; TA=25°°C; unless noted.) PARAMETER CONDITION Note *, switch off, OUT = open Note *, switch on, OUT = open low to high transition high to low transition, Note * VEN = VOH(min) = 2.4V VEN = VOL(max) = 0.8V Supply Current Enable Input Threshold Enable Input Current MIN 1.0 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 Short Circuit Current Limit Overtemperature shutdown Threshold Error Flag Output Resistance Error Flag Off Current UVLO Threshold VIN = 5V VIN = 3V RL = 10Ω each output RL = 10Ω each output RL = 10Ω each output RL = 10Ω each output each output each output TJ increasing TJ decreasing VIN = 5V, IL=10mA VIN = 3.3V, IL =10mA VFLAG = 5V VIN = increasing VIN = decreasing 0.5 TYP 25 110 2.4 2.2 0.01 0.01 1 100 140 1 0.5 1 1 0.75 135 125 10 15 0.01 2.5 2.3 MAX 2.5 1 1 20 20 10 1.25 1 UNITS µA µA V V µA µA pF mΩ mΩ ms ms µs µs µA A °C °C Ω Ω µA V V General Note: Devices are ESD protected, however, handling precautions recommended. Note *: Off is ≤ 1.0 and on is ≥2.4V for the G526-1. Off is ≥ 2.4V and on is ≤ 1.0V for the G526-2. The enable input has approximately 200mV of hysteresis. See control threshold charts. Pin Description PIN NUMBER PIN NAME 1/4 EN(A/B) 2/3 FLG(A/B) 6 GND 7 IN 8/5 OUT(A/B) PIN FUNCTION Enable (input): Logic-compatible enable input. High input >2.1V typical. Low input <1.9V typical (-1 active high, -2 active low). Do not float. Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent, UVLO, and thermal shutdown. Ground: Supply return. Supply Input: Output MOSFET source. Also supplies IC's internal circuitry. Connect to positive supply. Switch Output: Output MOSFET drain. Typically connect to switched side of load. TEL: 886-3-5788833 http://www.gmt.com.tw Ver 1.0 Dec 26, 2000 2 G526 Global Mixed-mode Technology Inc. Typical Applications VCC 5.0V Upstream VBUS 100mA max. 100k 10k 100k 3.3V USB Controller VBUS D+ 10k IN VIN OUT 1µF 1µF GND D－ GND Ferrite Beads ＋ G526 47µF ENA OUTA ON/OFF VBUS D+ D－ GND VBUS USB Port1 IN OVERCURRENT FLGA OVERCURRENT FLGB GND ON/OFF ENB OUTB 0.1µF D+ ＋ D－ GND 47µF Data USB Port2 Data (Two Pair) Block Diagrams FLGA OUTA ENA GATE CONTROL CHARGE PUMP OSC. THERMAL SHUTDOWN UVLO CHARGE PUMP GATE CONTROL CURRENT LIMIT 1.2V REFERENCE IN CURRENT LIMIT ENB OUTB FLGB G526 GND Functional Description The G526-1 and G526-2 are dual high-side switches with active-high and active-low enable inputs, respectively. Fault conditions turn off or inhibit turn-on one or both of the output transistors, depending upon the type of fault, and activate the open-drain error flag transistors to pull FLG pin to ground. signed to allow the MOSFET drain to be externally forced to a higher voltage than the source (VOUT > VIN) when the output is off. In this situation, the G526 avoids undesirable drain-to-body diode current flow by connecting the body to the most positive voltage. If VOUT >VIN when switch is enabled, current will flow from VOUT to VIN. Input and Output IN (input) is the power supply connection to the logic circuitry and the source of the output MOSFET. OUTx (output) is the drain of the output A or B MOSFET. In a typical circuit, current flows through the switch from IN to OUT toward the load. Thermal Shutdown Thermal shutdown shuts off both output MOSFETs and signals both fault flags if the die temperature exceeds 135°C. 10°C of hystersis prevents the switch from turning on until the die temperature drops to 125°C. Overtemperature detection functions only when at least one switch is enabled. The output MOSFET and driver circuitry are also de- TEL: 886-3-5788833 http://www.gmt.com.tw Ver 1.0 Dec 26, 2000 3 G526 Global Mixed-mode Technology Inc. Undervoltage Lockout UVLO (undervoltage lockout) prevents the output MOSFET from turning on until IN (input voltage) exceeds 2.5V typical. After the switch turns on, if the voltage drops below 2.3V typical, UVLO shuts off the output MOSFET and signals the fault flag. Undervoltage detection functions only when at least one switch is enabled. Fault Flag FLG is an N-channel, open-drain MOSFET output. The fault-flag is active (low) for one or more of the following conditions: undervoltage, current limit, or thermal shutdown. The flag output MOSFET is capable of sinking a 10mA load to typically 100mV above ground. Both flag pins may be "wire-NORed" to a common pullup resistor. 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. Applications Information Supply filtering A 0.1µF to 1µF bypass capacitor from IN to GND, located at the G526, 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. A current sense circuit senses the output current of MOSFET switch. If output current exceeds the current limit threshold, the output MOSFET switch is shut off and a fault flag is pulled low. The reaction to an overcurrent is measured with the following scenarios: Input or output transients must not exceed the absolute maximum supply voltage (VIN max = 6V) even for a short duration. Switch Enable into Heavy Load If a switch is powered-on or enabled into a heavy load or short-circuit, the switch immediately goes into a constant-current mode, reducing output voltage. The fault flag goes low until the load is reduced or thermal shutdown occurs. 4.0V to 5.5V G526 ENA Heavy Load Applied Suddenly to Enabled Switch When a heavy load is applied, a large current may flow from the output capacitor and the switch. The current limit circuit may shut the switch off briefly, then fold back into constant-current mode. In that case, the fault flag falls until the load is reduced. OUTA FLGA IN FLGB GND 0.1µF to 1µF ENB OUTB Figure 1. Supply Bypassing USB Controller G526 1 ENA 2 VBUS FLGA 3 FLGB 4 ENB USB Host OUTA IN 8 7 6 GND OUTB 5 CBULK Capacitive Load 4.7 µF GND Cable Bus Powered Hub Cable Downstream USB Device Figure 2. Soft Start (Single Channel) TEL: 886-3-5788833 http://www.gmt.com.tw Ver 1.0 Dec 26, 2000 4 G526 Global Mixed-mode Technology Inc. USB Controller G526 1 VBUS 2 4.7 µF USB Hub 3 4 ENA OUTA FLGA IN FLGB GND OUTB ENB 8 USB Function 7 6 CBULK USB Function 5 CBULK GND Cable USB Peripheral Figure 3. Inrush Current-Limit Application Transient Overcurrent Filter Enable Input EN must be driven logic high or logic low, or be pulled high or 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. V＋ G526 10k USB Controller Soft Start The G526 presents a high impedance when off, and slowly becomes a low impedance as it turns on. This reduces inrush current and related voltage drop that results from charging a capacitive load, satisfying the USB voltage drop requirements, for bus-powered applications as shown in Figure 2. 1 10k OVERCURRENT 0.1 µF 2 3 4 ENA OUTA FLGA IN FLGB GND ENB OUTB 8 7 6 5 Figure 4. Transient Filter The soft start circuit shown in Figure 3 can be utilized to meet USB transient regulation specifications with large load capacitances (CBULK >10µF). The G526 will provide inrush current limiting for these applications. The inrush current from the connection of a heavy capacitive load may cause the fault flag to fall for a short duration while the switch is in a constant-current mode, for charging the capacitance. In needed, a simple 1ms RC low-pass filter in series with the fault flag circuit will prevent erroneous overcurrent reporting (see Figure 4). TEL: 886-3-5788833 http://www.gmt.com.tw Ver 1.0 Dec 26, 2000 5 G526 Global Mixed-mode Technology Inc. Package Information C E H L D θ 7 ° (4X) A2 A A1 y e B Note: Package body sizes exclude mold flash and gate burrs Dimension L is measured in gage plane Tolerance 0.10mm unless otherwise specified 4. Controlling dimension is millimeter converted inch dimensions are not necessarily exact. SYMBOL A A1 A2 B C D E e H L y θ MIN. DIMENSION IN MM NOM. MAX. MIN. 1.35 0.10 ----0.33 0.19 4.80 3.80 ----5.80 0.40 ----0º 1.60 ----1.45 ----------------1.27 ----------------- 1.75 0.25 ----0.51 0.25 5.00 4.00 ----6.20 1.27 0.10 8º 0.053 0.004 ----0.013 0.007 0.189 0.150 ----0.228 0.016 ----0º DIMENSION IN INCH NOM. 0.063 ----0.057 ----------------0.050 ----------------- MAX. 0.069 0.010 ----0.020 0.010 0.197 0.157 ----0.244 0.050 0.004 8º TEL: 886-3-5788833 http://www.gmt.com.tw Ver 1.0 Dec 26, 2000 6