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Global Mixed-mode Technology Inc.
G526
Dual USB High-Side Power Switch
Features
Compliant to USB specifications Low MOSFET on resistance at 5.0V 140m max. per channel 500mA minimum continuous load current per channel 3.0V to 5.5V input 110A typical on-state supply current 1A 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 Available with active-high or active-low enable
Description
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. 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. 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. The G526 is available in active-high and active-low enable versions in 8-pin SOIC packages.
Applications
USB host and self-powered hubs Bus-powered hubs Hot plug-in power supplies Battery-charger circuits
Ordering Information
PART
G526-1 G526-2
ENABLE
Active High Active Low
TEMP. RANGE
40C to 85C 40C to 85C
PACKAGE
8-Pin SOP 8-Pin SOP
Pin Configuration
G526
ENA FLGA FLGB ENB 1 2 3 4 8 Pin SOP 8 7 6 5 OUTA (ENA)1 IN GND OUTB (FLGA)2 (FLGB)3 (ENB)4
G526
8(OUTA)
GATE CONTROL
7 (IN)
GATE CONTROL
5 (OUTB) 6 (GND)
Ver 1.0 Dec 26, 2000
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 Control Input (VEN)................................-0.3V to 6V Storage Temperature (TS)................-65C to +150C Lead Temperature (Soldering 5 sec.)................260C ESD protection...............................................2KV
G526
Operating Ratings
Supply Voltage (VIN)............................+3V to +5.5V Ambient Operating Temperature (TA)...-40C to +85C Thermal Resistance SOIC (JA).........................................160C/W
Electrical Characteristics(VIN=+5V; TA=25C; unless noted.)
PARAMETER
Supply Current Enable Input Threshold Enable Input Current 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 = 10 each output RL = 10 each output RL = 10 each output RL = 10 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
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
MIN
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
UNITS
A A V V A A pF m m ms ms s s A A C C A V V
2.5 1 1
1.0
0.5
20 20 10 1.25
1
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
1/4 2/3 6 7 8/5
PIN NAME
EN(A/B) FLG(A/B) GND IN 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.
Ver 1.0 Dec 26, 2000
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Typical Applications
VCC 5.0V 10k Upstream VBUS 100mA max. VBUS D+ D GND 1F GND IN OUT 1F 10k 3.3V USB Controller VIN ON/OFF 100k 100k G526 ENA OUTA FLGA IN 0.1F VBUS 47F D+ D GND FLGB GND ENB OUTB 47F Ferrite Beads VBUS D+ D GND
G526
USB Port1
OVERCURRENT OVERCURRENT ON/OFF
USB Port2
Data
Data (Two Pair)
Block Diagrams
FLGA OUTA ENA
CHARGE PUMP GATE CONTROL CURRENT LIMIT
OSC.
THERMAL SHUTDOWN
UVLO
1.2V REFERENCE
IN
CHARGE PUMP
GATE CONTROL
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. 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. The output MOSFET and driver circuitry are also de-
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. Thermal Shutdown Thermal shutdown shuts off both output MOSFETs and signals both fault flags if the die temperature exceeds 135C. 10C of hystersis prevents the switch from turning on until the die temperature drops to 125C. Overtemperature detection functions only when at least one switch is enabled.
Ver 1.0 Dec 26, 2000
TEL: 886-3-5788833 http://www.gmt.com.tw
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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. 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 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. 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.
G526
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.
Applications Information
Supply filtering A 0.1F to 1F 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. Input or output transients must not exceed the absolute maximum supply voltage (VIN max = 6V) even for a short duration.
4.0V to 5.5V
G526
ENA FLGA FLGB ENB OUTA IN 0.1F to 1F GND OUTB
Figure 1. Supply Bypassing
USB Controller
G526
VBUS USB Host
4.7 F 1 ENA 2 3
OUTA IN FLGA
8 7 6 CBULK Capacitive Load
FLGB 4 ENB
GND OUTB 5
GND Cable Bus Powered Hub Cable Downstream USB Device
Figure 2. Soft Start (Single Channel)
Ver 1.0 Dec 26, 2000
TEL: 886-3-5788833 http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
USB Controller
G526
USB Function
G526 VBUS
4.7 F 1 2 3 4 ENA FLGA FLGB ENB OUTA IN GND OUTB 8 7 6 5 CBULK USB Function CBULK
USB Hub GND Cable
USB Peripheral
Figure 3. Inrush Current-Limit Application
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. 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. The soft start circuit shown in Figure 3 can be utilized to meet USB transient regulation specifications with large load capacitances (CBULK >10F). The G526 will provide inrush current limiting for these applications.
Transient Overcurrent Filter
V
10k USB Controller 10k OVERCURRENT 0.1 F 1 2 3 4
G526
ENA FLGA FLGB ENB OUTA IN GND OUTB 8 7 6 5
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. In needed, a simple 1ms RC low-pass filter in series with the fault flag circuit will prevent erroneous overcurrent reporting (see Figure 4).
Ver 1.0 Dec 26, 2000
TEL: 886-3-5788833 http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
Package Information
C
G526
E
H
L D 7 (4X)
A2 A1 e B
A
y
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
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
Ver 1.0 Dec 26, 2000
TEL: 886-3-5788833 http://www.gmt.com.tw
6

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