A2526EL GATE GATE CONTROL CONTROL DUAL POWER CONTROL SWITCHE

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A2526EL GATE GATE CONTROL CONTROL DUAL POWER CONTROL SWITCHE

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2526 2536
A2526EL
GATE GATE CONTROL CONTROL
DUAL POWER CONTROL SWITCHES
A2526EL A2536EL integrated high-side dual power switches, optimized self-powered bus-powered Universal Serial (USB) applications. external components necessary satisfy requirements. A2526EL ENABLE inputs active high; A2536EL active low. devices ideally suited applications. Each switch channel supplies required peripheral devices. addition, switch's on-resistance permits achieving voltage-drop requirements. Fault current limited typically satisfying safety requirements, flag output available indicate fault condition local controller. Momentary voltage drops that occur upstream port when switch enabled bus-powered applications eliminated "soft start" feature. Additional features include thermal shutdown prevent catastrophic switch failure from high-current loads, undervoltage lockout ensure that device remains unless there valid input voltage present, logic-compatible enable inputs. These switches provided 8-lead SOIC package tape reel ("TR" suffix added part number) with automatic handling equipment.
Data Sheet 27447.2B
Dwg. PP-070-6
ABSOLUTE MAXIMUM RATINGS Supply Voltage, Output Voltage, VOUT Output Current, IOUT Internally Limited ENABLE Voltage Range, -0.3 Fault Flag Voltage, VFLG Fault Flag Current, IFLG Package Power Dissipation, Graph Operating Temperature Range, -40°C +85°C Junction Temperature, +150°C* Storage Temperature Range, -65°C 150°C
Fault conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions tolerated should avoided.
Features
Input Continuous Load Current Port Maximum ON-Resistance 1.25 Maximum Short-Circuit Current Limit Individual Open-Drain Fault Flag Outputs Typical ON-State Supply Current Typical OFF-State Supply Current Outputs Forced Higher Than Input (off-state) Thermal Shutdown Typical Undervoltage Lockout Turn (soft-start) Fast Turn A2526EL (active-high) Improved Replacement MIC2526-1 A2536EL (active-low) Improved Replacement MIC2526-2 Hosts Self-Powered Hubs Bus-Powered Hubs Plug-In Power Supplies Battery-Charger Circuits
Applications
2526 2536 DUAL POWER CONTROL SWITCHES
FUNCTIONAL BLOCK DIAGRAM
FLGA
A2536 ONLY
OUTA
CHARGE PUMP
GATE CONTROL
CURRENT LIMIT
UVLO
REF.
A2536 ONLY
CHARGE PUMP
GATE CONTROL
CURRENT LIMIT
OUTB FLGB
Dwg. FP-049-1
A2536EL
ALLOWABLE PACKAGE POWER DISSIPATION WATTS
GATE GATE CONTROL CONTROL
140°C/W
Dwg. PP-070-7
Always order complete part number, e.g., A2526ELTR where "TR" indicates tape reel.
TEMPERATURE
Dwg. GP-009-3A
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 2000, 2002 Allegro MicroSystems, Inc.
2526 2536 DUAL POWER CONTROL SWITCHES
Electrical Characteristics 25°C, each output tested separately (unless otherwise noted).
Limits Parameter Operating Voltage Range Switch Resistance Test Conditions IOUT IOUT Output Leakage Current Maximum Load Current Short-Circuit Current Limit Current-Limit Threshold ENABLE Input Threshold Each output (output disabled), VOUT Each output Each output (enabled into load), VOUT Ramped load applied enabled output, VOUT Low-to-high transition High-to-low transition ENABLE Input Hysteresis ENABLE Input Current ENABLE Input Cap. Output Turn-On Delay Output Turn-On Rise Time Output Turn-Off Delay Output Turn-Off Fall Time Error Flag Output Resistance Error Flag Current Supply Current VENABLE VOUT VOUT VOUT VENABLE VOUT VOUT VOUT VFLG Both switches disabled (see note), open Both switches enabled (see note), open UVLO Threshold Increasing Decreasing Over-Temperature Shutdown Threshold Increasing Decreasing <1.0 0.75 ±0.01 0.01 2.35 1.25 ±1.0 Units
Note Disabled enabled (active high) A2526EL. Disabled 0.8VIN enabled (active low) A2536EL.
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2526 2536 DUAL POWER CONTROL SWITCHES
FUNCTIONAL DESCRIPTION
Power switch power switch N-channel MOSFET with maximum on-state resistance (VIN Configured high-side switch, power switch prevents current flow either direction disabled. drain body diode disconnected from source when switch allowing output voltage exceed input voltage without causing current conduction. power switch supplies minimum switch. Charge pump internal charge pump supplies power driver circuit provides necessary voltage pull gate MOSFET above source. charge pump operates from input voltages charge pump limited establish controlled turn time typically Driver driver controls gate voltage power switch. limit large current surges reduce associated electromagnetic interference (EMI) produced, driver incorporates circuitry that controls rise times fall times output voltage. rise time typically ENABLE logic enable disables power switch bias charge pump, driver, other circuitry reduce supply current less than maximum when logic high present (A2526) logic present (A2536). proper logic level restores bias drive control circuits turns power enable input compatible with both CMOS logic levels. Fault Flag (FLG) This open drain output asserted (active low) when overcurrent over temperature condition encountered. output will remain asserted until overcurrent over temperature condition removed. Current sense sense monitors current supplied load. sense measures current more efficiently than conventional resistance methods. When overload short circuit encountered, current-sense circuitry sends control signal driver. driver turn reduces gate voltage drives power into saturation region, which switches output into constant-current mode holds current constant while varying voltage load. Thermal sense internal thermal-sense circuit shuts power switch when junction temperature rises approximately 165°C. Hysteresis built into thermal sense circuit. After device cooled approximately 10°C, switch turns back switch continues cycle until fault removed. Undervoltage lockout voltage-sense circuit monitors input voltage. When input voltage approximately control signal turns power switch.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2526 2536 DUAL POWER CONTROL SWITCHES
NO-LOAD SWITCHING PERFORMANCE
VOUT
VOUT
VENABLE
VENABLE
VOUT
VENABLE
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2526 2536 DUAL POWER CONTROL SWITCHES
CAPACITIVE-LOAD SWITCHING PERFORMANCE
VENABLE
VENABLE
VOUT
VOUT
IOUT
IOUT
VFAULT
VFAULT
VENABLE
VOUT
1000 CURRENT LIMITING
IOUT
VFAULT
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2526 2536 DUAL POWER CONTROL SWITCHES
OUTPUT SHORT-CIRCUIT PERFORMANCE
VFAULT
VFAULT
VOUT
VOUT
IOUT IOUT
SHORT CIRCUIT
SHORT CIRCUIT
VFAULT
VFAULT
IOUT
THERMAL SHUTDOWN
THERMAL SHUTDOWN
IOUT
SHORT CIRCUIT
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2526 2536 DUAL POWER CONTROL SWITCHES
APPLICATIONS INFORMATION
Overcurrent sense employed overcurrent conditions. Unlike current-sense resistors, sense FETs increase series resistance current path. When overcurrent condition detected, device maintains constant output current reduces output voltage accordingly. Complete shutdown occurs only fault present long enough activate thermal limiting. Three possible overload conditions occur. first condition, output been shorted before device enabled between been applied. device senses short immediately switches into constant-current output. second condition, short occurs while device enabled. instant short occurs, very high currents flow short time before current-limit circuit react After current-limit circuit tripped (reached overcurrent trip threshold) device switches into constantcurrent mode. third condition, load been gradually increased beyond recommended operating current. current permitted rise until current-limit threshold reached until thermal limit device exceeded. device capable delivering current current-limit threshold without damage. Once threshold been reached, device switches into constant-current mode. Fault Flag (FLG) open-drain output asserted (active low) when overcurrent over-temperature condition encountered. output will remain asserted until overcurrent overtemperature condition removed. Connecting heavy capacitive load enabled device cause momentary false over-current reporting from inrush current flowing through device, charging downstream capacitor. filter connected terminal reduce false overcurrent reporting. Using low-ESR electrolytic capacitors output lowers inrush current flow through device during hotplug events providing impedance energy source, thereby reducing erroneous overcurrent reporting. Power dissipation junction temperature on-resistance n-channel MOSFET allows small surface-mount packages, such SOIC, pass large currents. thermal resistance these packages high compared those power packages; good design practice check power dissipation junction temperature. first step find rDS(on) input voltage operating temperature. Next, calculate power dissipation using: rDS(on) Finally, calculate junction temperature: where: ambient temperature thermal resistance (108°C/W). Thermal protection Thermal protection prevents damage when heavyoverload short-circuit faults present extended periods time. faults force these devices into constant-current mode, which causes voltage across high-side switch increase; under short-circuit conditions, voltage across switch equal input voltage. increased dissipation causes junction temperature rise high levels. protection circuit senses junction temperature switch shuts OFF. Hysteresis built into thermal sense circuit, after device cooled approximately 20°, switch turns back switch continues cycle this manner until load fault input power removed. Undervoltage lock-out (UVLO) undervoltage lockout ensures that power switch state power Whenever input voltage falls below approximately power switch will quickly turned OFF. This facilitates design hot-insertion systems where possible turn power switch before input power removed. UVLO will also keep switch from being turned until power supply reached least even switch enabled. Upon reinsertion, power switch will turned with controlled rise time reduce voltage overshoots. Power supply considerations ceramic bypass capacitor between GND, close device, recommended. Placing high-value electrolytic capacitor output terminals also desirable when output load heavy. capacitor reduces power supply transients that cause ringing input. Also, bypassing output with 0.01 ceramic capacitor improves immunity device short-circuit transients.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2526 2536 DUAL POWER CONTROL SWITCHES
TYPICAL APPLICATIONS
UPSTREAM CONNECTOR VBUS
A2526EL CONTROLLER
GATE CONTROL
FERRITE BEADS
PORTA VBUS
OVERCURRENTA GROUND OVERCURRENTB ON/OFFB
GATE CONTROL
DATA
Dwg. EP-070-1B
Host Application
UPSTREAM CONNECTOR VBUS
A2526EL
CONTROLLER
GATE CONTROL
OVERCURRENTA GROUND OVERCURRENTB ON/OFFB
GATE CONTROL
DATA
Dwg. EP-070-11B
Bus-Powered
products described here manufactured under more U.S. patents U.S. patents pending. Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements performance, reliability, manufacturability products. Before placing order, user cautioned verify that information being relied upon current. Allegro products authorized critical components life-support devices systems without express written approval. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringement patents other rights third parties which result from use.
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ON/OFFA
ON/OFFA
DATA
PORTB VBUS
DATA
FERRITE BEADS
PORTA VBUS
DATA
PORTB VBUS
DATA
2526 2536 DUAL POWER CONTROL SWITCHES
A2526ELTR A2536ELTR
Dimensions Inches (for reference only)
0.0098 0.0075
0.1574 0.1497
0.2440 0.2284
0.050 0.016
0.020 0.013
0.1968 0.1890
0.050
0.0688 0.0532 0.0098 0.0040
Dwg. MA-007-8A
Dimensions Millimeters (controlling dimensions)
0.25 0.19
4.00 3.80
6.20 5.80
1.27 0.40
0.51 0.33
5.00 4.80
1.27
1.75 1.35 0.25 0.10
Dwg. MA-007-8A
NOTES: Lead spacing tolerance non-cumulative. Exact body lead configuration vendor's option within limits shown. "TR" part number suffix indicates tape reel.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

A2526EL GATE GATE CONTROL CONTROL DUAL POWER CONTROL SWITCHE

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