Global Mixed-mode Technology Inc. G528/G528A USB High-Side Power Switch Advance Information Features General Description The G528/G528A is an integrated high-side power switch optimized for self-powered and bus-powered Universal Serial Bus (USB) applications. Typical 110mΩ, Low MOSFET on resistance, at 5.0V 3.0V to 5.5V operating range 100 µA typical on-state supply current 1µA 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 active-low version (G528), or available with active-high version (G528A) UL Approved_#E232223 The G528/G528A satisfies the USB standards. The switch's low on-resistance meets USB voltage drop requirements. When the output load exceeds current-limit threshold, G528/G528A switches into constant-current mode and limit the output current to a safe level, which is typically 1.4A. 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 Ordering Information ORDER NUMBER ORDER NUMBER (Pb free) ENABLE TEMP. RANGE PACKAGE G528P1U G528AP1U G528P1Uf G528AP1Uf Active Low Active High -40°C to +85°C -40°C to +85°C SOP-8 SOP-8 Note: P1: SOP-8L U: Tape & Reel Pin Configuration G528/G528A GND 1 8 OUT IN 2 7 OUT IN 3 6 OUT EN 4 (EN) 5 FLG SOP-8 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 May 17, 2005 1 Global Mixed-mode Technology Inc. G528/G528A 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 (V EN )………………..…………-0.3V to 6V Storage Temperature (TS)….………...-65°C to +150°C Reflow Temperature (soldering, 10sec)……..….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 MIN TYP MAX UNIT **switch off, OUT = open **switch on, OUT = open ----- 1 100 5 160 µA µA low to high transition high to low transition ** V EN = VOH(min) = 2.5V V EN = VOL(max) = 1.0V --0.8 ----- 2.5 --- V V ----- 0.01 0.01 1 1 µA µA --- 1 --- pF VIN = 5V, IOUT = 500mA VIN = 3.3V, IOUT = 500mA RL = 10Ω RL = 10Ω, CL=100µF --------- 110 130 0.03 0.5 140 180 ----- mΩ mΩ RL = 10Ω RL = 10Ω --- 1 20 µs --- 1 20 µs --- 1 10 µA Short Circuit Current Limit Circuit Limit Threshold Enable into load Ramped load applied to enabled output 1.0 2.0 1.4 2.7 2.0 3.5 A A Overtemperature Shutdown Threshold TJ increasing TJ decreasing VIN = 5V, IL=10mA VIN = 3.3V, IL =10mA --------- 135 125 10 15 ----25 40 °C °C Ω Ω VFLAG = 5V VIN = increasing ----- 0.01 2.5 1 --- µA V VIN = decreasing --- 2.3 --- V IN Supply Current EN Enable Threshold EN Input Current CONDITION EN Input Capacitance Switch Resistance OUT Turn-On Delay OUT Turn-On Rise Time OUT Turn-Off Delay OUT Turn-Off Fall Time OUT Leakage Current FLG Output Resistance FLG Off Current UVLO Threshold ms ms * Devices are ESD protected, however, handling precautions are recommended. ** For the G528/G528A, off is ≥ 2.5V and on is ≤ 0.8V. The enable input, EN has approximately 200mV of hysteresis. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 May 17, 2005 2 Global Mixed-mode Technology Inc. G528/G528A Typical Performance Characteristics (VIN= 5V, TA=25°C, G528A, 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 May 17, 2005 3 Global Mixed-mode Technology Inc. G528/G528A Typical Performance Characteristics (VIN= 5V, TA=25°C, G528A, 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 May 17, 2005 4 G528/G528A Global Mixed-mode Technology Inc. Pin Description PIN NAME G528 G528A 1 1 GND 2,3 2,3 IN PIN FUNCTION Ground. Input Supply: Output MOSFET source, which also supplies IC's internal circuitry. Connect to positive supply. EN Active-low switch enable input. A logic low turns on the switch. 4 EN Active-High switch enable input. A logic High turns on the switch. 5 5 FLG 6,7,8 6,7,8 OUT 4 Open-Drain Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent, thermal shutdown and UVLO. Switch Output: Output MOSFET drain. Typically connect to switched side of load. Typical Applications VCC 5.0V 10K Upstream VBUS 100mA max. G911 VBUS D+ IN IN OUT OUT 1µF D － GND GND VIN 1µF Ferrite Beads 100K G528 3.3 V USB Controller EN EN OUT ON/OFF OC GND FLG 0.1µF VBUS D+ D- ＋150µF IN GND USB Port GND 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 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 May 17, 2005 5 G528/G528A Global Mixed-mode Technology Inc. Functional Description 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. See the "Enable into Short Circuit" graph. The G528/G528A is high-side 1-channel switch with active-low enable input. Fault conditions turn off or inhibit turn-on of the output transistors. 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. All OUT pins must be connected together to the load. 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. See the “Short Applied to Output” graph and the "Ramped Load to Enable Device" graph. 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 G528/G528A 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. Fault Flag FLG is a 2-channel, open-drain MOSFET output. Thefault-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. Thermal Shutdown Thermal shutdown protects G528/G528A from excessive power dissipation. If the die temperature exceeds 135°C, the MOSFETS switch is shut off. 10°C of hystersis prevents the switch from turning on until the die temperature drops to 125°C. Thermal shutdown circuit functions only when the switch is enabled. Applications Information Supply filtering A 0.1µF to 1µF bypass capacitor from IN to GND as shown in Figure 1, located near the G528/G528A, 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. 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. UVLO detection functions only when the switch is enabled. Input transients must not exceed the absolute maximum supply voltage (VIN max = 6V) even for a short duration. 3.0V to 5.5V G528 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. IN OUT 0.1 µF to 1 µF off on 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. The reaction to an overcurrent is measured with the following scenarios: EN GND Figure 1. Supply Bypassing TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 May 17, 2005 6 G528/G528A Global Mixed-mode Technology Inc. USB Controller G528 G528 VBUS EN FLG IN USB Host 0.1 µF 4.7 µF OUT GND Capacitive Load CBULK GND Bus Powered Hub Cable Cable Downstream USB Device Figure 2. Soft Start USB Controller G528 IN OUT VBUS 4.7 µF 0.1 µF USB Hub USB Function EN GND CBULK GND USB Peripheral Cable Figure 3. Inrush Current-Limit Application results from charging a capacitive load, satisfying the USB voltage drop requirements, for bus-powered applications as shown in Figure 2. EN , the active-low 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. The soft start circuit shown in Figure 3 can be utilized to meet USB transient regulation specifications with large load capacitances (CBULK >10µF). The G528/G528A will provide inrush current limiting for these applications. Soft Start The G528/G528A is high impedance when off and slowly becomes a low impedance as it turns on. This reduces inrush current and related voltage drop that TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 May 17, 2005 7 G528/G528A Global Mixed-mode Technology Inc. Package Information C E H L D θ 7 ° (4X) A2 A A1 y e 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. MIN. DIMENSION IN MM NOM. MAX. MIN. DIMENSION IN INCH NOM. MAX. A 1.35 1.60 1.75 0.053 0.063 0.069 A1 A2 0.10 ---- --1.45 0.25 --- 0.004 --- --0.057 0.010 --- B C 0.33 0.19 ----- 0.51 0.25 0.013 0.007 ----- 0.020 0.010 D E 4.80 3.80 ----- 5.00 4.00 0.189 0.150 ----- 0.197 0.157 e H L y θ ----5.80 0.40 ----- 1.27 --------- ---6.20 1.27 0.10 --0.228 0.016 --- 0.050 ------- --0.244 0.050 0.004 0º ---- 8º 0º --- 8º SYMBOL Taping Specification PACKAGE Q’TY/REEL SOP-8 2,500 ea 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 May 17, 2005 8