B2526 Description Linear B2526 dual high-side power switch r

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B2526 Description Linear B2526 dual high-side power switch r

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Dual High Side Power Switch
B2526
Description
Linear B2526 dual high-side power switch recommended self-powered bus-powdered universal serial (USB) application conforming requirements. voltage drop requirements, fault current limited 750mA, flag output indicate fault connections local controller features that meet requirements. Additional features such thermal shutdown prevent catastrophic switch failure from excessively high current loads, under voltage lockout (UVLO) ensure that device remains unless there valid input voltage present, 3.3V logic compatible enable inputs. versions enable pin, Active High Active available 8pin 8-pin SOIC packages.
Features
3.0V 5.5V Input 110µA Typical on-State Supply Current Typical off-State Supply Current 500mA Minimum Continuous Load Current 1.25A Maximum Current Limit 2.4V Typical Under Voltage Lockout (UVLO) Open-Drain Fault Flag Thermal Shutdown Available with Active-High Active-Low Enable
Applications
Host self-Powered Hubs Power Management Battery-Charger Circuits Plug-In Power Supplies Bus-Powered Hubs
Package Information
Ordering Information
Package
SO-8 Active High B2526-1M B2526-1P
Enable
Active B2526-2M B2526-2P
SO-8
FLAG FLAG VOUT VOUT
Logic Charge Pump Logic Charge Pump
B2526
View
Linear,
2418Armstrong St., Livermore 94550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B2526
ABSOLUTE MAXIMUM RATINGS
Supply Voltage.6V Fault Flag Voltage.6V Fault Flag Current.50mA Output Voltage.6V Output Current.Internally Limited Enable Input.-0.3V Storage Temperature.-65°C +150°C Lead Temperature (Soldering sec.).260°C
OPERATING RATING
Supply Voltage .+3V +5.5V Ambient Operating Temperature. -40°C +85°C
Thermal Resistance SOIC 120°C/W DIP. 130°C/W
ELECTRICAL CHARACTERISTICS Ta=25°C, unless otherwise specified. (Note Units Parameters
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 Continuous Load Current Short Circuit Current Limit Current Limit Threshold Over temperature Shutdown Threshold Error Flag Output Resistance Error Flag Current UVLO Threshold
Conditions
(Note1) Switch Off, Open (Note1) Switch Open High Transition High Transition, (Note1) 5.5V IOUT 500mA, Each Switch 3.3V IOUT 500mA, Each Switch Each output (output disabled) Each output Each output (enable into load), VOUT 4.0V Ramped Load applied enable output, VOUT 4.0V Increasing Decreasing 5.0V, 10mA 3.3V, 10mA VFLAG Increasing Decreasing
0.75 0.01
0.75 0.01 1.25
General Note: Devices protected, however, handling precautions recommended. Note 0.8V 2.4V B2526-1. 2.4V 0.8V B2526-2. Enable input approximately 200mV hysteresis.
TEST CIRCUIT
(Only Output Shown)
0.1µF B2526
Ferrite Bead IOUT
(for Current Limit Response)
ILOAD
Functional Characteristics Test Circuit
Linear,
2418Armstrong St., Livermore 94550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B2526
DESCRIPTION
Name (A)/(B) FLAG (A)/(B) VOUT (A)/(B) Function Enable (Input): Logic-compatible enables input. High input 2.1V typical. input 1.9V typical (B2526-1 active high, B2526 active low). Fault Flag (Output): Active-low, open-drain output. Indicates over current, UVLO thermal shutdown. Ground: Supply return. Supply Input: Output MOSFET drain. Also supplies IC's internal circuitry. Connect positive supply. Switch Output: Output MOSFET source. Typically connect switched side load.
DETAILED DESCRIPITION
Power Switch power switch N-Channel MOSFET with maximum on-state resistance 140m (VIN 5V). power switch supplies minimum 500mA switch. Enable Logic enable disables power switch bias charge pump, driver other circuitry reduce supply current less than when logic high present B2526-2 logic present B2526-1. enable input compatible with both CMOS logic levels. Driver driver controls gate voltage power switch. Limit large current surges driver incorporates circuitry that controls rise fall times output voltage. Charge Pump internal charge pump supplies power driver circuit provides necessary voltages pull gate MOSFET above source. Fault Flag (A)/(B) N-Channel, open drain MOSFET output. fault flag active (low) more following conditions: undervoltage (while 2.7V), current limit thermal shutdown. flag output MOSFET capable sinking 10mA load typically 100mV above ground. Multiple pins "wired NORed" common pull-up resistor. Thermal Shutdown internal thermal sense circuit shuts power switch when junction temperature rises approximately 150°C. Hysteresis built into thermal sense circuit. Current Sense sense monitors current supplied load. When overload short circuit encountered, current sense circuitry sends control signal driver. driver turn reduces gate voltage sends power into saturation region, which switches output into constant current mode. 2526 current-limit profile exhibits small foldback effect approximately 500mA. Once this current-limit threshold exceeded device enters constant current mode. constant current specified short circuit current limit "Electrical Characteristics" table. important note that 2526 will deliver load current current-limit Threshold which typically 1.6A (2.2Amax)." Under-Voltage Lockout (UVLO) UVLO prevents output MOSFET form turning until exceeds 2.5V. under-voltage state, will low. After switch turns voltage drops below approximately 2.3V, UVLO shuts output MOSFET signals fault flag. Under-voltage detection functions only when least switch enabled.
Linear,
2418Armstrong St., Livermore 94550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B2526
Linear,
2418Armstrong St., Livermore 94550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B2526
B4300
B2526
Two-Port Self Powered (Using B2526 B4300)
Linear,
2418Armstrong St., Livermore 94550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B2526
BLOCK DIAGRAM
TYPICAL APPLICATION
3.3V Controller 0.1µF ON/OFF 100K 100K
Ferrite Beads VBUS
B2526-2
47µF 0.1µF
DGND
Port
Over-Current Over-Current ON/OFF
VBUS
47µF
DGND
Port
Data (Two Pair Controller)
Port Self-Powered
Linear,
2418Armstrong St., Livermore 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
Advance Information- These data sheets contain descriptions products that development. specifications based engineering calculations, computer simulations and/ initial prototype evaluation. Preliminary Information- These data sheets contain minimum maximum specifications that based initial device characterizations. These limits subject change upon completion full characterization over specified temperature supply voltage ranges.
application circuit examples only explain representative applications devices intended guarantee circuit design permit industrial property right other rights execute. Linear takes responsibility problems related industrial property right resulting from contents shown data book. Typical parameters vary different applications. Customer's technical experts must validate operating parameters including Typical" each customer application.
LIFE SUPPORT NUCLEAR POLICY
Linear products authorized should used within life support systems which intended surgical implants into body support sustain life, aircraft, space equipment, submarine, nuclear facility applications without specific written consent Linear President.
Linear,
2418Armstrong St., Livermore 94550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com

B2526 Description Linear B2526 dual high-side power switch r

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