GM2526

GM2526 ETC1 | Alldatasheet

Document overview

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Technical content

Features

Compliant to USB Specifications Two Independent Switches Input from 3V to 5.5V Min. Continuous Load Current 500mA per port Max. ON-Resistance 140mW Max. Short Circuit Current Limit 1.25A Individual Open-Drain Fault Flag Pins ON-State Supply Current 110µA (typ.) OFF-State Supply Current 0.75µA (typ.) Thermal Shutdown Undervoltage Lockout (UVLO) Typically 2.4V 1ms Turn-ON (soft-start) and Fast Turn-OFF Active-High or Active-Low Enable Versions GM2526 V0.1 www.gammamicro.com PRELIMINARY Power Management OUTA IN OUTB ENA/ ENA FLGA FLGB ENB/ ENB GND LOGIC, CHARGE PUMP LOGIC, CHARGE PUMP A A MICROELECTRONICS GM2526 Power Management DUAL USB POWER SWITCH GM2526 H/ L

MARKING INFORMATION & PIN CONFIGURATIONS (TOP VIEW) SOP-8 ENA/ FLGA ENA ENB/ FLGB ENB GND OUTB IN OUTA GM2526 AYWW Ordering Number Package Shipping GM2526HS8T GM2526LS8T GM2526HS8R GM2526LS8R SOP - 8 SOP - 8 SOP - 8 SOP - 8

100 Units / Tube

2,500 Units / Tape & Reel 2,500 Units / Tape & Reel

ORDERING INFORMATION

• For detail Ordering Number identification, please see last page. PIN DESCRIPTION PIN NUMBER PIN SYMBOL FUNCTION EN(A/B) EN(A/B) FLG(A/B) GND IN OUT(A/B) Enable (Input): Logic-compatible enable input. High input > 2.1V typical Low input < 1.9V typical (H active high, L active low). Do not float. Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent, and thermal shutdown, UVLO, OVLO Ground: Supply return. Supply Input: Output MOSFET drain. Also supplies IC's internal circuitry. Connect to positive supply. Switch Output: Output MOSFET source. Typically connect to switched side of load. A= Assembly Location Y= Year WW= Weekly Power Management A A MICROELECTRONICS GM2526 Power Management DUAL USB POWER SWITCH

1.2VReference DRIVER Gate Control UVLO, OVLO OSC. Thermal Shutdown Charge Pump Charge Pump Current Limit FUNCTIONAL CHARACTERISTICS TEST CIRCUIT OUTA IN IOUT CL OUTB ENA/ ENA FLGA FLGB ENB/ ENB GND Ferrite Bead (For Current Limit Response) (1 output shown) 10k 0.1µF GM2526 RL ILOAD Power Management A A MICROELECTRONICS GM2526 Power Management DUAL USB POWER SWITCH

-0.3 to 12 -65 to +150 V V V GM2526 SYMBOL VIN VFLG VOUT IFLG IOUT VEN TS mA mA V Operation Rating PARAMETER VALUE UNIT Supply Voltage Ambient Operating Temperature 3 to 5.5 -40 to 85 V SYMBOL VIN TA Power Management A A MICROELECTRONICS GM2526 Power Management DUAL USB POWER SWITCH

ELECTRICAL CHARACTERISTICS

V = 5V, T = 25°C (unless otherwise noted) IN A TEST CONDITIONS MIN TYP MAX UNIT CHARACTERISTICS TEST CONDITIONS Supply Current Enable Input Threshold Switch Resistance Overtemperature Shutdown Threshold Error Flag Output Resistance UVLO Threshold Enable Input Current Output Turn- ON Delay Output Turn- OFF Delay Enable Input Capacitance Output Turn- ON Rise Time Output Turn- OFF Fall Time Output Leakage Current Continuous Load Current Error Flag Off Current Short-Circuit Current Limit Current-Limit Threshold Switch off, OUT= open (Note 3) Low-to-high transition V = 5V , I = 500mA, each switch IN OUT T increasing J V =5V, I =10mA IN L V = increasing IN All switch on, OUT= open (Note 3) High-to-low transition (Note 3) V = 0V to 5.5V EN R = 10W each output L R = 10W each output L R = 10W each output L R = 10W each output L each output (output disabled) each output (enable into load)= 4.0V each output V =5V FLG 0.8 -1.0 0.5 0.5 0.75 2.1 100 135 2.5 110 1.9 140 125 2.3 ±0.01 0.5 0.75 0.01 2.4 140 160 180 1.0 1.25 2.2 µA V mW W pF µA ms µs V = 2.7V, I = 500mA, each switch IN OUT ms µs µA A µA A A 1.6 ramped load applied to enabled output, V 4.0V OUT T decreasing J V =3.3V, I =10mA IN L V =decreasing IN V Note 1: Exceeding the absolute maximum rating may damage the device. Note 2: The device is not guaranteed to function outside its operating rating. The enable input has approximately 200mV of hysteresis. Power Management A A MICROELECTRONICS GM2526 Power Management DUAL USB POWER SWITCH

The GM2526-H (active-high) and GM2526-L (active-low) are dual high-side switches. Fault conditions turn off (or inhibit turn-on) of one or more of the output transistors, depending upon the type of fault, activate the open- drain error flag transistors, and sinking current to ground. Input and Output IN (input) is the power supply connection to the logic circuitry and the drain of the output MOSFET. OUTx (out- put) is the source of its respective MOSFET. In a typical application, current flows through the switch from IN to OUT toward the load. If V is greater than V when a switch is enabled, current will flow from OUT to IN OUT IN since the MOSFET is bidirectional when active. The output MOSFET and driver circuitry are also designed to al- low the MOSFET source to be externally forced to a higher voltage than the drain (V > V ) when the output OUT IN is off. In this situation, the GM2526 avoids undesirable current flow from OUT to IN. If V falls below 2.5V, IN and UVLO disables both switches. Thermal Shutdown Thermal shutdown shuts off the affected output MOSFETs and signals all fault flags if the die temperature ex- ceeds 135°C. Hysteresis of 10°C pre-vents the switch from turning on until the die temperature drops to 125°C. Note: over-temperature detection functions only when at least one switch is enabled. Current Limit Induced Thermal Shutdown GM2526 raises the output MOSFET on-resistance until series combination of the MOSFET on-resistance and load impedance limit current to 850mA (typ.). Normally the increased power dissipation will activate thermal shutdown, and disabling affected channels of GM2526. If you prefer to avoid this, you can respond to the fault and disable the current limited channel externally before GM2526 reaches shutdown temperature. The time be- tween the flag indicates a current limit fault and thermal shutdown depends on ambient temperature, board lay- out, and load impedance. But, you will have typically a few hundred milliseconds. If you do not want GM2526 to go into thermal shutdown, the USB controller recognize a fault and disable the appropriate channel within this time. If the fault is not removed or the switch is not disabled within this time, then GM2526 will experience ther- mal oscillation of about 2Hz. This does not damage GM2526. Undervoltage Lockout UVLO prevents the output MOSFET from turning on until V exceeds approximately 2.5V. Until turn-on, the IN FLAG will be low. After the switch turns on, UVLO signals the fault flag and shuts off the output MOSFET if the voltage drops below approximately 2.3V. Undervoltage detect functions only when at least one switch is en- abled. Current Sensing and Limiting The current-limit threshold is preset internally. The preset level prevents damage to the output MOSFET and ex- ternal load, but allows a minimum current of 0.5A through each channel's output MOSFET. The current-limit cir- cuit senses a portion of the output MOSFET switch current. The current sense resistor shown in the block dia- gram is virtual and has no voltage drop. The reaction to an overcurrent condition varies according to the circum- stances: (a) If a switch is powered on or enabled into a heavy load or short-circuit, the switch immediately goes into a constant-current mode, and reducing the output voltage. The fault flag goes low until the load is reduced. (b) When a heavy load is applied, a large transient current may flow until the current limit circuitry responds. At which point the device limits current to less than the short-circuit current limit specification. (C) GM2526 current- limit profile exhibits a small (~500mA) foldback effect. Once past the current-limit threshold, GM2526 operates in constant-current mode (see "short circuit current limit" in the Electrical Characteristics). Note, GM2526 will deliver load current up to the current-limit threshold, typically 1.6A. Fault Flag FLG is an N-channel, open-drain MOSFET output. The faultflag is active (low) for one or more of the following conditions: undervoltage current limit, or thermal shutdown. The flag output MOSFET can sink a 10mA load to 100mV (typically) above ground. You can "wire NOR" multiple FLG pins to a common pull-up resistor. Power Management A A MICROELECTRONICS GM2526 Power Management DUAL USB POWER SWITCH

APPLICATION INFORMATION

To control supply transients, place a 0.1µF to 1µF bypass capacitor from IN to GND right at GM2526. Without this bypass capacitor, an output short can cause ringing from supply lead inductance on the input and damage the internal control circuitry. Input or output transients must never exceed the absolute maximum supply voltage (V = 6V). IN max Figure1. Supply Bypassing Enable Input EN must been driven logic high or logic low for a clearly defined input. Floating the input will have unpredictable (but certainly undesirable) results. EN must never be allowed to go negative with respect to GND. Soft Start The GM2526 has high impedance when off, which gradually shifts to a low impedance as the chip turns on. This reduces the inrush current and voltage drop, which occured when charging a capacitive load, thus meet- ing the USB voltage drop requirements for bus-powered applications as shown in Figure 3. You can use the soft start circuit shown in Figure 4 to meet USB transient regulation specifications with large load capacitances (C > 10uF). GM2526 provides inrush current limiting for these applications BULK Transient Overcurrent Filter When GM2526 is turned on, large capacitance values at the output of GM2526 cause the inrush current to cross GM2526's short circuit current-limit threshold and assert the flag. The duration of this situation depends on the value of the output capacitance. Figure 2. Transient Filter

R GM2526 ORDERING NUMBER GM 2526 H S8 T Gamma Micro. Circuit Type Package S8: SOP-8 Shipping R: Tape & Reel T: Tube Active level H: Active level L: Active level 0.275 7.0 0.155 4.0 0.060 1.52 0.050 1.270 0.024 0.6 Inches mm ( ) Pad Layout 0.236 ± 0.008 0.050 (1.270) SOP-8(SO-8) PACKAGE OUTLINE DIMENSIONS +0.21 -0.20 (5.99 ) (3.91 ± 0.1) +0.003 -0.004 0.154 PIN INDENT (1.60 ± 0.13) 0.063 ± 0.005 0.057 (1.45) (0.175 ± 0.075) 0.0025 ± 0.0015 +0.004 -0.003 0.016 +0.10 -0.08 (0.41 ) +0.0018 -0.0005 0.008 +0.05 -0.01 (0.20 ) +0.022 -0.013 0.028 +0.56 -0.33 (0.71 ) +0.004 -0.002 0.191 +0.10 -0.05 (4.85 ) Inches mm ( ) Power Management A A MICROELECTRONICS GM2526 Power Management DUAL USB POWER SWITCH