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| Global Mixed-mode Technology Inc. G528/G528A USB High-Side Power Switch Advance Information Features Typical 110m, Low MOSFET on resistance, at 5.0V 3.0V to 5.5V operating range 100 A typical on-state supply current 1A 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 General Description The G528/G528A is an integrated high-side power switch optimized for self-powered and bus-powered Universal Serial Bus (USB) applications. 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 G528P1U G528AP1U Note: P1: SOP-8L U: Tape & Reel ORDER NUMBER (Pb free) G528P1UF G528AP1Uf ENABLE Active Low Active High TEMP. RANGE -40C to +85C -40C to +85C PACKAGE SOP-8 SOP-8 Pin Configuration G528/G528A GND IN IN 1 2 3 8 7 6 5 OUT OUT OUT FLG EN 4 (EN) SOP-8 Ver: 1.2 May 17, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. Absolute Maximum 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)................-65C to +150C Reflow Temperature (soldering, 10sec)............260C ESD protection*..............................................2kV G528/G528A Operating Ratings Supply Voltage (VIN).............................+3V to +5.5V Operating Temperature (TA)................-40C to +85C Thermal Resistance SOIC (JA)..........................................160C/W Electrical Characteristics (VIN=+5V; TA=25C.) PARAMETER IN Supply Current EN Enable Threshold EN Input Current EN Input Capacitance CONDITION **switch off, OUT = open **switch on, OUT = open low to high transition high to low transition ** V EN = VOH(min) = 2.5V V EN = VOL(max) = 1.0V VIN = 5V, IOUT = 500mA VIN = 3.3V, IOUT = 500mA RL = 10 RL = 10, CL=100F RL = 10 RL = 10 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 MIN ------0.8 --------------------1.0 2.0 --------------- TYP 1 100 ----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 MAX 5 160 2.5 --1 1 --140 180 ----20 20 10 2.0 3.5 ----25 40 1 ----- UNIT A A V V A A pF m m ms ms s s A A A C C A V V Switch Resistance 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 FLG Output Resistance FLG Off Current UVLO Threshold * 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. Ver: 1.2 May 17, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 2 Global Mixed-mode Technology Inc. Typical Performance Characteristics (VIN= 5V, TA=25C, G528A, unless otherwise noted.) G528/G528A IOUT Ramp Chart Flag Delay After OC Output Turn-On Delay Output Turn-Off Delay Power Up (UVLO) Power Down (UVLO) Ver: 1.2 May 17, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 3 Global Mixed-mode Technology Inc. Typical Performance Characteristics (VIN= 5V, TA=25C, G528A, unless otherwise noted.) G528/G528A Turn-On Characteristics Turn-On Characteristics Turn-On Characteristics Turn-On Characteristics Short Circuit Response (Short Applied to Output) Ver: 1.2 May 17, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 4 Global Mixed-mode Technology Inc. Pin Description PIN G528 1 2,3 4 4 5 6,7,8 5 6,7,8 G528A 1 2,3 G528/G528A NAME GND IN EN PIN FUNCTION Ground. Input Supply: Output MOSFET source, which also supplies IC's internal circuitry. Connect to positive supply. Active-low switch enable input. A logic low turns on the switch. Active-High switch enable input. A logic High turns on the switch. 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. EN FLG OUT Typical Applications VCC 5.0V Upstream VBUS 100mA max. VBUS D+ D GND 1F 10K G911 IN OUT IN OUT GND 1F 100K G528 EN OUT EN FLG IN GND 150F Ferrite Beads 3.3 V USB Controller VIN ON/OFF OC GND VBUS D+ DGND USB Port 0.1F 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 Ver: 1.2 May 17, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 5 Global Mixed-mode Technology Inc. Functional Description 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. 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. Thermal Shutdown Thermal shutdown protects G528/G528A from excessive power dissipation. If the die temperature exceeds 135C, the MOSFETS switch is shut off. 10C of hystersis prevents the switch from turning on until the die temperature drops to 125C. 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. UVLO detection functions only when the 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. 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: G528/G528A 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. 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. 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. Applications Information Supply filtering A 0.1F to 1F 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. Input transients must not exceed the absolute maximum supply voltage (VIN max = 6V) even for a short duration. 3.0V to 5.5V G528 IN 0.1 F to 1 F off on OUT EN GND Figure 1. Supply Bypassing Ver: 1.2 May 17, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 6 Global Mixed-mode Technology Inc. G528/G528A USB Controller G528 G528 VBUS EN FLG IN 0.1 F 4.7 F GND OUT USB Host CBULK Capacitive Load GND Cable Bus Powered Hub Cable Downstream USB Device Figure 2. Soft Start G528 IN VBUS 4.7 F USB Hub 0.1 F OUT USB Controller EN GND USB Function CBULK GND USB Peripheral Cable Figure 3. Inrush Current-Limit Application 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. results from charging a capacitive load, satisfying the USB voltage drop requirements, for bus-powered applications as shown in Figure 2. The soft start circuit shown in Figure 3 can be utilized to meet USB transient regulation specifications with large load capacitances (CBULK >10F). 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 Ver: 1.2 May 17, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 7 Global Mixed-mode Technology Inc. Package Information G528/G528A C E H L D 7 (4X) A2 A1 e B A y 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 MIN. 1.35 0.10 ---0.33 0.19 4.80 3.80 ----5.80 0.40 ----0 DIMENSION IN MM NOM. 1.60 --1.45 --------1.27 ------------ MAX. 1.75 0.25 --0.51 0.25 5.00 4.00 ---6.20 1.27 0.10 8 MIN. 0.053 0.004 --0.013 0.007 0.189 0.150 --0.228 0.016 --0 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 8 Taping Specification PACKAGE SOP-8 Q'TY/REEL 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. Ver: 1.2 May 17, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 8 |
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