G525A Global Mixed-mode Technology Inc. USB High-Side Power Switch Advance Information Features General Description Typical 110mΩ Ω , Low MOSFET on resistance, at The G525A is an integrated high-side power switch optimized for self-powered and bus-powered Universal Serial Bus (USB) applications. 5.0V 1A minimum continuous load current 3.0V to 5.5V operating range 100 µA typical on-state supply current 1 µA typical standby supply current Output can be forced higher than input when operating in off state. 1.4A Typical current limit Thermal shutdown protection 2.4V typical under-voltage lockout (UVLO) Open-drain fault flag pin Slow turn-on (soft-start) and fast turnoff Logic level enable pin, available with activehigh or active-low version UL Approved_#E232223 The G525A satisfies the USB standards. The switch's low on-resistance meets USB voltage drop requirements. When the output load exceeds current-limit threshold, G525A switches into constant mode and limit the output current to a safe level, which is typically 1.4A, well below the UL 25VA safety requirements. An open-drain flag output is also 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. Besides, a thermal shutdown circuit is included to prevent catastrophic switch failure caused by increasing power dissipation when continuous heavy loads or short circuit occurs. A under-voltage lockout (UVLO) circuit ensures 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 High-side power protection switch USB power management USB host and self-powered hubs USB Bus-powered hubs Hot plug-in power supplies Battery-charger circuits The G525A is a UL recognized component and is available in active-high and active-low versions in 8-pin SOP packages. Ordering Information PART G525A1 G525A2 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 G525A G525A EN 1 8 OUT FLG 2 7 IN 6,8 (OUT) (EN)1 (FLG)2 GND 3 6 OUT NC 4 5 NC Gate Control 7 (IN) 3 (GND) 8 Pin Function Block 8 Pin SOP R UL Recognized Component TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Nov 11, 2002 1 G525A 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 Enable 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 Operating Temperature (TA)…………….-40°C to +85°C Thermal Resistance SOIC (θJA)……………………………………160°C/W Electrical Characteristics (VIN=+5V; TA=25°C.) PARAMETER CONDITION MIN **switch off, OUT = open **switch on, OUT = open low to high transition high to low transition ** VEN = VOH(min) = 2.5V VEN = VOL(max) = 1.0V IN Supply Current EN Enable Threshold EN Input Current VIN = 5V , IOUT = 500mA VIN = 3.3V , IOUT = 500mA RL = 10Ω RL = 10Ω, CL=100µF RL = 10Ω RL = 10Ω OUT Turn-On Delay OUT Turn-On Rise Time OUT Turn-Off Delay OUT Turn-Off Fall Time OUT Leakage Current Short Circuit Current Limit Circuit Limit Threshold Overtemperature Shutdown Threshold Enable into load Ramped load applied to enabled output TJ increasing TJ decreasing VIN = 5V, IL=10mA VIN = 3.3V, IL =10mA VFLAG = 5V VIN = increasing VIN = decreasing FLG Output Resistance FLG Off Current UVLO Threshold MAX UNITS 1 100 5 160 2.5 0.01 0.01 1 110 130 0.03 0.5 1 1 1 1.4 2.7 135 125 10 15 0.01 2.5 2.3 1 1 µA µA V V µA µA pF mΩ mΩ ms ms µs µs µA A A °C °C Ω Ω 0.8 EN Input Capacitance Switch Resistance TYP 1.0 2.0 140 180 20 20 10 2.0 3.5 25 40 1 µA V V * Devices are ESD protected, however, handling precautions are recommended. ** For the G525A1, off is ≤ 1.0 and on is ≥2.5V. For the G525A2, off is ≥ 2.5V and on is ≤ 1.0V. The enable input, CTRL, has approximately 200mV of hysteresis. Pin Description PIN NUMBER PIN NAME 1 EN 2 FLG 3 4,5 GND NC 7 IN 6,8 OUT PIN FUNCTION Enable (input): Logic level enable input. High input >2.4V typical. Low input <2.2V typical (1 for active high, 2 for active low). Make sure EN never floating. Open-Drain Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent, thermal shutdown and UVLO. Ground. Not internally connected. Input Supply: Output MOSFET source, which 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: 1.2 Nov 11, 2002 2 Global Mixed-mode Technology Inc. G525A TYPICAL PERFORMANCE CHARACTERISTICS (VIN= 5V, TA=25°° C, G525A1, unless otherwise noted.) Flag Delay After OC Iout Ramp Chart Output Turn-On Delay Output Turn-Off Delay Power Up (UVLO) Power Down (UVLO) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Nov 11, 2002 3 Global Mixed-mode Technology Inc. G525A TYPICAL PERFORMANCE CHARACTERISTICS (VIN= 5V,TA=25°° C, G525A1, unless otherwise noted.) Turn-On Characteristics Turn-On Characteristics Turn-On Characteristics Turn-On Characteristics Short Circuit Response (Short Applied to Output) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Nov 11, 2002 4 G525A Global Mixed-mode Technology Inc. Typical Applications VCC 5.0V 10k Upstream VBUS 100mA max. VBUS D+ G912 IN 1µF D－ 100k VIN OUT 1 µF GND Ferrite Beads G525A 3.3V USB Controller EN OUT FLG IN GND OUT NC NC ON/OFF OVERCURRENT GND GND ＋ VBUS D+ USB Port D－ 150 µF GND 0.1 µF Data Data Single-Port Self-Powered USB Hub Application Function Block Diagrams IN EN Clock Gate Control BandGap Reference Overcurrent Limiting CMP Current Sense OUT FLG UVLO GND Thermal Sense Functional Description The output MOSFET and driving circuit are also designed to allow the MOSFET drain to be externally forced to a higher voltage than the source (VOUT > VIN) when the switch is off. In this situation, the G525A 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. The G525A1 and G525A2 are high-side 1-channel switches with active-high and active-low enable inputs, respectively. Fault conditions turn off or inhibit turn-on of the output transistors and activate the open-drain error flag transistors to pull FLG pin to ground. Input and Output IN (input) is the power supply connection to the logic circuitry and the source of the output MOSFET. OUT (output) is the drain of the output MOSFET. In a typical application, current flows through the switch from IN to OUT toward the load. Both OUT pins must be connected together to the load. Thermal Shutdown Thermal shutdown protects G525A from excessive power dissipation. If the die temperature exceeds 135°C, the MOSFETS switch is shut off and a fault flag is activated. 10°C of hystersis prevents the switch TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Nov 11, 2002 5 G525A Global Mixed-mode Technology Inc. Fault Flag FLG is a 2-channel, open-drain MOSFET output. The fault-flag is active (low) for one or more of the following conditions: current limiting, undervoltage, or thermal shutdown. The flag output MOSFET is capable of sinking a 10mA load to typically 100mV above ground. from turning on until the die temperature drops to 125°C. Thermal shutdown circuit functions only when the switch is enabled. Undervoltage Lockout UVLO (undervoltage lockout) prevents the output MOSFET from turning on until IN (input voltage) exceeds 2.5V typically. After the switch turns on, if the voltage drops below 2.3V typically, UVLO shuts off the output MOSFET and signals the fault flag. UVLO detection functions only when the switch is enabled. Applications Information Supply filtering A 0.1µF to 1µF bypass capacitor from IN to GND, located near the G525A, 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. 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. Input transients must not exceed the absolute maximum supply voltage (VIN max = 6V) even for a short duration. 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: Figure 1. Supply Bypassing Switch Enabled into Heavy Load If the switch is powered on or enabled into a heavy load or short-circuit, the switch immediately goes into a constant-current mode, reducing the output voltage. The fault flag goes low until the load is reduced or thermal shutdown occurs. See the "Enable into Short Circuit" graph. 3.0V to 5.5V G525A Heavy Load Applied to Enabled Switch When a heavy load is applied, a large current may flow from 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. See the “Short Applied to Output” graph and the "Ramped Load to Enable Device" graph. OUT 8 FLG IN 7 3 GND OUT 6 4 NC NC 5 1 EN 2 0.1 µF to 1 µF USB Controller 1 VBUS EN FLG 3 GND 4 NC 2 USB Host 4.7 µF G525A 8 OUT 7 IN 6 OUT NC 5 CBULK Capacitive Load 0.1 µF GND Cable Bus Powered Hub Cable Downstream USB Device Figure 2. Soft Start TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Nov 11, 2002 6 G525A Global Mixed-mode Technology Inc. 1 G525A 8 OUT 7 IN OUT 6 NC 5 EN 4.7 2 FLG µF 3 GND 4 NC VBUS USB Hub USB Controller USB Function CBULK GND USB Peripheral Cable Figure 3. Inrush Current-Limit Application Transient Overcurrent Filter EN, the enable Input EN, with 0.2V hysteresis, 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. V＋ G525A 10k Soft Start The G525A is 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. OVERCURRENT To USB 1 EN 10k 0.1 µF OUT 8 FLG IN 7 3 GND OUT 6 NC 5 2 4 The soft start circuit shown in Figure 3 can be utilized to meet USB transient regulation specifications with large load capacitances (CBULK >10µF). The G525A will provide inrush current limiting for these applications. NC Figure 4. Transient Filter 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. If 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: 1.2 Nov 11, 2002 7 G525A Global Mixed-mode Technology Inc. Package Information C E H L D θ 7 ° (4X) A2 y e A A1 B Note: 1. Package body sizes exclude mold flash and gate burrs 2. Dimension L is measured in gage plane 3. 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 Taping Specification Feed Direction Typical SOP Package Orientation GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Nov 11, 2002 8