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Global Mixed-mode Technology Inc.
G525A
USB High-Side Power Switch Advance Information
Features
Typical 110m, Low MOSFET on resistance, at 5.0V 1A minimum continuous load current 3.0V to 5.5V operating range 100 A typical on-state supply current 1 A 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
General Description
The G525A is an integrated high-side power switch optimized for self-powered and bus-powered Universal Serial Bus (USB) applications. 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. The G525A is a UL recognized component and is available in active-high and active-low versions in 8-pin SOP packages.
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
PART
G525A1 G525A2
ENABLE
Active High Active Low
TEMP. RANGE
-40C to 85C -40C to 85C
PACKAGE
8-Pin SOP 8-Pin SOP
Pin Configuration
G525A
EN FLG GND NC 1 2 3 4 8 7 6 5 OUT IN OUT NC 3 (GND) (EN)1 (FLG)2 Gate Control 7 (IN)
G525A
6,8 (OUT)
8 Pin SOP
8 Pin Function Block
R
UL Recognized Component
Ver: 1.2 Nov 11, 2002
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 (VEN).................................-0.3V to 6V Storage Temperature (TS).................-65C to +150C Lead Temperature (Soldering 5 sec.)...............260C ESD protection*..............................................2kV
G525A
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 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 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 1.0 2.0
CONDITION
**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
MIN
TYP
1 100
MAX
5 160 2.5 1 1 140 180
UNITS
A A V V A A pF m m ms ms s s A A A C C A V V
0.8 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
20 20 10 2.0 3.5
25 40 1
* 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
1 2 3 4,5 7 6,8
PIN NAME
EN FLG GND NC IN 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.
Ver: 1.2 Nov 11, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN= 5V, TA=25C, G525A1, unless otherwise noted.)
G525A
Iout Ramp Chart
Flag Delay After OC
Output Turn-On Delay
Output Turn-Off Delay
Power Up (UVLO)
Power Down (UVLO)
Ver: 1.2 Nov 11, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN= 5V,TA=25C, G525A1, unless otherwise noted.)
G525A
Turn-On Characteristics
Turn-On Characteristics
Turn-On Characteristics
Turn-On Characteristics
Short Circuit Response (Short Applied to Output)
Ver: 1.2 Nov 11, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Applications
VCC 5.0V Upstream VBUS 100mA max. VBUS D+ D GND 1F 10k 100k
G525A
Ferrite Beads 150 F
G912
IN OUT GND 1 F
3.3V USB Controller VIN ON/OFF GND
OVERCURRENT
G525A
EN OUT FLG IN GND OUT NC NC
VBUS D+ D GND USB Port
0.1 F 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 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.
Ver: 1.2 Nov 11, 2002
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. Thermal Shutdown Thermal shutdown protects G525A from excessive power dissipation. If the die temperature exceeds 135C, the MOSFETS switch is shut off and a fault flag is activated. 10C of hystersis prevents the switch
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
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 and signals the fault flag. 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 and a fault flag is pulled low. The reaction to an overcurrent is measured with the following scenarios: 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. 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.
G525A
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.
Applications Information
Supply filtering A 0.1F to 1F 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. Input transients must not exceed the absolute maximum supply voltage (VIN max = 6V) even for a short duration. Figure 1. Supply Bypassing
3.0V to 5.5V
G525A
1 2 3 4 EN FLG GND NC OUT IN OUT NC 8 7 0.1 F to 1 F 6 5
USB Controller VBUS 1 2 USB Host 4.7 F
G525A
EN FLG 3 GND 4 NC
8 OUT 7 IN 6 OUT NC 5 0.1 F
CBULK
Capacitive Load
GND Cable Bus Powered Hub Cable Downstream USB Device
Figure 2. Soft Start
Ver: 1.2 Nov 11, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
G525A
USB Controller
VBUS
USB Hub
EN 4.7 2 FLG F 3 GND 4 NC
1
G525A
8 OUT 7 IN OUT 6 NC 5 CBULK
USB Function
GND USB Peripheral Cable
Figure 3. Inrush Current-Limit Application
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. 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. The soft start circuit shown in Figure 3 can be utilized to meet USB transient regulation specifications with large load capacitances (CBULK >10F). The G525A will provide inrush current limiting for these applications.
Transient Overcurrent Filter
V
10k OVERCURRENT To USB 10k 0.1 F
G525A
1 EN 2 FLG OUT IN OUT NC 8 7 6 5
3 GND 4 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).
Ver: 1.2 Nov 11, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Package Information
C
G525A
E
H
L D 7 (4X)
A2 y B A1
A
e
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
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 Nov 11, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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