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june 2010 1 m9999-062110 mic2505/2506 micrel mic2505/2506 single 2a / dual 1a / high-side switches general description the mic2505, mic2505-1, mic2505-2, and mic2506 are single and dual integrated high-side power switches that consist of ttl compatible control/enable inputs, a charge pump, and protected n-channel mosfets. the mic2505/6 family can be used instead of separate high-side drivers and mosfets in many low-voltage applications. the mic2505/6 family controls voltages ranging from 2.7v to 7.5v. the mic2505-series can deliver at least 2a continuous current while the mic2506 can deliver at least 1a continuous current from each output. a slow turn-on feature prevents high inrush current when switching capacitive loads. the internal control circuitry is powered from the same 2.7v to 7.5v. within the device? input range, outputs can be forced higher than the input voltage when disabled. multipurpose open-drain fault flag outputs indicate overcur- rent limiting, open-load detection (except mic2505-1 and -2 versions), thermal shutdown, or undervoltage lockout for each channel. overcurrent limiting is internally fixed and requires no exter- nal components. open-load detection is active when the switch is off. when off, a normal load pulls the output pin low. if the load is open, an optional, external, high-value resistor pulls the output pin high, triggering the fault flag. mic2505-1 and -2 versions are tailored to universal serial bus (usb) applications and do not include open-load detection. thermal shutdown turns off the output if the die temperature exceeds approximately 135 c. if enabled, the switch auto- matically restarts when the temperature falls 10 c. undervoltage lockout (uvlo) shuts off the output if the supply drops below 2.3v typical and reenables the output when the supply exceeds 2.5v typical. typical applications load a on off mic2505bm load ctl out flg gnd out gate in optional output delay capacitor 100k in fault 2.7v to 7.5v pull-up resistor (100k) 18 27 36 45 optional open load detect resistor (mic2505bn or mic2505bm only) 0.1f a on a off mic2506bm ctl a out a flg a flg b gnd ctl b out b in fault a 2.7v to 7.5v pull-up resistors (100k each) 18 27 36 45 optional open load detect resistors 0.1f load b 100k 100k b on b off fault b single and dual switch/circuit breakers with open-load detection and fault output features low mosfet on resistance to 2.7v 30m ? typical at 5v (mic2505-series) 35m ? typical at 3.3v (mic2505-series) 75m ? typical at 5v (each mic2506 output) 80m ? typical at 3.3v (each mic2506 output) 2.7v to 7.5v input 110a typical on-state supply current 1 a typical off-state supply current output can be forced higher than input (off-state) current limit thermal shutdown 2.5v undervoltage lockout (uvlo) open-load detection (mic2505bn/m and mic2506bn/m only) open-drain fault flag 5ms (slow) turn-on and fast turnoff logic-level control/enable input applications usb power distribution 3.3v and 5v power management pc card card inrush limiting switch hot plug-in power supplies battery-charger circuits micrel, inc. ?1849 fortune drive ?san jose, ca 95131 ?usa ?tel + 1 (408) 944-0800 ?fax + 1 (408) 474-1000 ?http://www.mic rel.com
mic2505/2506 micrel m9999-062110 2 june 2010 pin configuration 1 2 3 4 8 7 6 5 out in out in ctl flg gnd gate mic2505/-1/-2 1 2 3 4 8 7 6 5 out a in gnd out b ctl a flg a flg b ctl b mic2506 8-pin soic (m) 8-pin dip (n) 8-pin soic (m) 8-pin dip (n) logic, charge pump 6, 8 (out) 3 (gnd) (ctl a) 1 (flg a) 2 5, 7 (in) (gate a) 4 mic2505/-1/-2 logic, charge pump logic, charge pump 8 (out a) 5 (out b) 7 (in) 6 (gnd) (ctl a) 1 (flg a) 2 (flg b) 3 (ctl b) 4 mic2506 ordering information part number control/enable open-load detect temperature range package lead finish single-switch mic2505bm active-high yes 40 c to +85 c 8-pin soic standard mic2505ym active-high yes 40 c to +85 c 8-pin soic pb-free mic2505bn active-high yes 40 c to +85 c 8-pin dip standard mic2505-1bm active-high no 40 c to +85 c 8-pin soic standard mic2505-1ym active-high no 40 c to +85 c 8-pin soic pb-free mic2505-1bn active-high no 40 c to +85 c 8-pin dip standard mic2505-2bm active-low no 40 c to +85 c 8-pin soic standard mic2505-2ym active-low no 40 c to +85 c 8-pin soic pb-free mic2505-2bn active-low no 40 c to +85 c 8-pin dip standard dual switch mic2506bm active-high yes 40 c to +85 c 8-pin soic standard mic2506ym active-high yes 40 c to +85 c 8-pin soic pb-free mic2506bn active-high yes 40 c to +85 c 8-pin dip standard
june 2010 3 m9999-062110 mic2505/2506 micrel pin description pin number pin number pin name pin function mic2505 series mic2506 1 1 / 4 ctl (a/b) control (input): ttl compatible control input. high input typically > 1.8v. low input typically < 1.6v. mic2505, mic2505-1 and mic2506 are active high. mic2505-2 is active low. 2 2 / 3 flg (a/b) fault flag (output): active-low, open-drain output. if ctl is low, indicates open load. if ctl is high, indicates current limit, thermal shutdown, or uvlo. mic2505-1 and -2 do not support open-load detect . 3 6 gnd ground: return. 4 gate output mosfet gate: open for fastest rise time. connect capacitor to ground to slow rise time. (see mic2505 turn-on delay graph) 5, 7 7 in supply input: output mosfet drain. also supplies ic s internal circuitry. connect to supply. mic2505 series only: pins 5 and 7 must be externally connected together. 6, 8 8 / 5 out (a/b) switch output: output mosfet source. typically connect to switched side of load. output voltage can be pulled above input voltage in off mode. mic2505 series only: pins 6 and 8 must be externally connected together. absolute maximum ratings supply voltage (v in ) .................................................... 8.0v fault flag voltage (v flg ) ............................................. 7.5v fault flag current (i flg ) ............................................ 50ma output voltage (v out ) ................................................. 7.5v output current (i out ) ............................... internally limited gate voltage (v gate ) ......................................... v in + 15v control input (v ctl ) ....................................... 0.3v to 15v storage temperature (t a ) ....................... 65 c to +150 c lead temperature (soldering 5 sec.) ....................... 260 c operating ratings supply voltage (v in ) ................................... +2.7v to +7.5v ambient operating temperature (t a ) ........ 40 c to +85 c thermal resistance soic ( ja ) ......................................................... 160 c/w dip ( ja ) ............................................................ 105 c/w
mic2505/2506 micrel m9999-062110 4 june 2010 electrical characteristics v in = +5v; gate = open; t a = 25 c, bold indicates 40 c t a +85c; unless noted parameter condition min typ max units supply current mic2505-1 v ctl = logic 0, out = open 0.75 5 a mic2506 v ctl = logic 1, out = open 110 160 a mic2505-2 v ctl = logic 0, out = open 110 160 a v ctl = logic 1, out = open 0.75 5 a control input voltage v ctl = logic 0 logic 1 transition 2.1 2.4 v v ctl = logic 1 logic 0 transition 0.8 1.9 v control input current v ctl = logic 0 0.01 1 a v ctl = logic 1 0.01 1 a control input capacitance 1p f output mosfet resistance mic2505 series v in = 5v, t a = 25 c3 0 50 m? v in = 5v, 40 c < t a < +85c 60 m? v in = 3.3v, t a = 25 c3 5 60 m? v in = 3.3v, 40c < t a < +85 c 75 m? mic2506 v in = 5v, t a = 25 c7 5 125 m? v in = 5v, 40 c < t a < +85c 150 m? v in = 3.3v, t a = 25 c8 0 135 m? v in = 3.3v, 40c < t a < +85 c 165 m? output turn-on delay mic2505 series r l = 10 ? , c gate = 0 200 850 2000 s mic2506 r l = 10 ? each output 100 700 2000 s output turn-on rise time mic2505 series r l = 10 ? , c gate = 0 500 3000 7500 s mic2506 r l = 10 ? each output 200 2000 6000 s output turnoff delay mic2505 series r l = 10 ? , c gate = 0 0.7 20 s mic2506 r l = 10 ? each output 0.8 20 s output turnoff fall time mic2505 series r l = 10 ? , c gate = 0 1.5 20 s mic2506 r l = 10 ? each output 0.7 20 s output leakage current 10 a current limit threshold mic2505 series 2 4a mic2506 1 23a open load threshold, note 1 v ctl = logic low, note 2 0.5 1 1.5 v overtemperature shutdown t j increasing 135 c threshold t j decreasing 125 c error flag output resistance v in = 5v, i l = 10ma 10 25 ? v in = 3.3v, i l = 10ma 15 40 ? error flag off current v flag = 5v 0.01 1 a uvlo threshold v in = increasing 2.2 2.5 2.7 v v in = decreasing 2.0 2.3 2.5 v general note: devices are esd protected, however, handling precautions recommended. general note: all limits guaranteed by testing or statistical analysis. note 1: mic2505-1 and -2 versions have no open load detect feature. note 2: open-load threshold is the output voltage (v out ) where flg becomes active (low) when ctl is low. out is pulled high by a 100k external resistor to v in .
june 2010 5 m9999-062110 mic2505/2506 micrel typical characteristics note 2 -2 024 time (s) -5 0 5 10 control (v) -2 0 2 4 6 -2 0246 output (v) time (ms) mic2505 turn-on, turnoff characteristics r l = 5? (i l = 1a) 0 20 40 60 80 100 2345678 output resistance (m?) supply voltage (v) output on resistance vs. supply voltage mic2505 mic2506 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 on resistance (m ?) temperature (c) output on resistance vs. temperature mic2506 mic2505 -1 012 time (s) -5 0 5 10 control (v) -2 0 2 4 6 -2 0246 output (v) time (ms) mic2506 turn-on, turnoff characteristics r l = 5? (i l = 1a) 1.5 2.0 2.5 3.0 -40 -20 0 20 40 60 80 100 threshold voltage (v) temperature (c) uvlo threshold voltage vs. temperature v in rising v in falling 0 100 200 300 400 0.1 1 10 100 error flag voltage (mv) error flag current (ma) error flag voltage vs. error flag current flg = active v dd = 3.3v v dd = 5v 0 20 40 60 80 100 120 140 160 180 200 2345678 supply current (a) supply voltage (v) on-state supply current vs. supply voltage 0 0.5 1.0 1.5 2.0 2345678 supply current (a) supply voltage (v) off-state supply current vs. supply voltage 1.0 1.5 2.0 2.5 2345 threshold voltage (v) supply voltage (v) control threshold vs. supply voltage v ctl rising v ctl falling test circuits mic2506bm ctl a out a flg a gnd ctl b out b in flg b b on b off a on a off +5v 1f 10? 10? mic2505/-1/-2 ctl out flg gnd out gate in in +5v 1f 10? v flg 10k? 10k? v flg a v flg b 10k?
mic2505/2506 micrel m9999-062110 6 june 2010 0 20 40 60 80 100 120 140 160 180 200 -40 -20 0 20 40 60 80 100 supply current ( a) temperature ( c) on-state supply current vs. temperature 0 0.5 1.0 1.5 2.0 -40 -20 0 20 40 60 80 100 supply current ( a) temperature ( c) off-state supply current vs. temperature 1 1.5 2.0 2.5 -40 -20 0 20 40 60 80 100 threshold voltage (v) temperature ( c) control threshold vs. temperature v ctl rising v ctl falling 0 200 400 600 800 1000 0 50 100 150 200 250 turn-on delay (ms) capacitance (nf) mic2505 turn-on delay with external gate capacitance
june 2010 7 m9999-062110 mic2505/2506 micrel block diagrams 1.2v reference thermal shutdown osc. charge pump out uvlo gate control in open load detect flg ctl current limit gate gnd not included in mic2505-1, -2 mic2505/2505-1/2505-2 mic2505-series block diagram 1.2v reference thermal shutdown charge pump out b uvlo gate control in open load detect ctl a gate control out a open load detect flg b charge pump ctl b osc. flg a current limit current limit gnd mic2506 mic2506 block diagram
mic2505/2506 micrel m9999-062110 8 june 2010 functional description the mic2505-series and mic2506 are high-side n-channel switches. the mic2505, mic2505-1, and mic2506 have active-high enable inputs. the mic2505-2 has an active-low input. fault conditions inhibit output transistor turn-on or turnoff when enabled. control input ctl (control input) activates the oscillator, thermal shut- down, uvlo, 1.2v reference, and gate control circuits. if there are no fault conditions, the output mosfet turns on when enabled. reference a 1.2v bandgap reference supplies a regulated voltage to the thermal shutdown and undervoltage lockout circuits. the reference is only active when ctl is enabled. oscillator/charge pump the oscillator produces an 80khz square wave output which drives the charge pump. the oscillator is enabled when ctl is active. the charge pump is a voltage quintupler (5 ). the charge pump capacitors are self contained. gate control the gate control circuit charges the output mosfet gate from the charge pump output or discharges the mosfet gate to ground as determined by ctl, thermal shutdown, or uvlo (undervoltage lockout). an optional, external capacitor may be connected to the mic2505 gate to lengthen the rise time. this slows the turn on of the mosfet output switch. (see mic2505 turn-on delay graph.) since this pin connects directly to the mosfet gate, use esd precautions when contacting components connected to this pin. leakage resistance may increase turn- on times. input and output in (input) is the supply connection to the logic circuitry and the drain of the output mosfet. out (output) is the source of the output 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 designed to allow the mosfet source to be externally forced to a higher voltage than the drain (v out > v in ) when the output switch is off and v in > uvlo minimum. in this situation, the mic2505/6 avoids undesirable drain to body diode reverse current flow by grounding the body when the switch is off. (the conven- tional method for optimum turn-on threshold has the source connected to the body. this would allow a large current to flow when v source > v drain + 0.6v.) mic2505 series only duplicate in and out leads are not internally connected. connect both in pins to the supply. connect both out leads to the load. thermal shutdown thermal shutdown shuts off the output mosfet and signals the fault flag if the die temperature exceeds 135 c. 10 c of hysteresis prevents the switch from turning on until the die temperature drops to 125 c. overtemperature detection functions only when the control input is enabled (output mosfet is on). both mic2506 outputs are shut off during overtemperature, and both flags will go low. undervoltage lockout uvlo (undervoltage lockout) prevents the output mosfet from turning on until v in (input voltage) exceeds 2.5v typical. after the switch turns on, if v in drops below 2.3v typical, uvlo shuts off the output mosfet and turns the fault flag on (active low) until v in drops below 1.5v. undervoltage detection functions only when the control input is enabled (output mosfet is on). overcurrent limit the overcurrent limit is preset internally. the preset level prevents damage to the output mosfet but allows a mini- mum current of 2a through the output mosfet of the mic2505-series and 1a for each output mosfet of the mic2506. output current is monitored by sensing the voltage drop across the output mosfet drain metal resistance. overcurrent detection functions only when the control input is enabled (output mosfet is on) and v in is above the uvlo threshold. open-load detection open-load detection is available only on the mic2505 and mic2506. the open-load detection feature is not included in the mic2505-1 or -2 versions. open-load detection indicates the absence of an output load by activating the fault flag. open-load detection is optional and is enabled by connecting a high-value pull-up resistor between in and out. if there is no load, the circuit detects a high out (output) voltage (typically 1v) and signals the fault flag. under normal conditions, the low resistance of a typical load pulls out low. open-load detection functions only when the control input is low (output mosfet is off). 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: open load (except mic2505-1 and -2 versions), undervolt- age, current limit, or thermal shutdown. the flag output mosfet is capable of sinking a 10ma load to typically 100mv above ground.
june 2010 9 m9999-062110 mic2505/2506 micrel applications information supply filtering a 0.1 f to 1 f bypass capacitor from in to gnd, located at the device is strongly recommended to control supply tran- sients. without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead induc- tance) to destroy the internal control circuitry. input transients must not exceed the absolute maximum supply voltage (v in max = 7.5v) even for a short duration. on off mic2505bm ctl out flg gnd out gate in in 18 27 36 45 0.1f to 1f 2.7v to 7.5v figure 1. supply bypassing the bypass capacitor may be omitted only if board design precautions are followed, such as using extremely short supply leads or power and ground planes. control input ctl 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. add a diode clamp if negative spikes may occur. see figure 2. open-load detection refer to typical applications (first page). open-load detec- tion is available only on the mic2505 and mic2506. for usb power distribution applications, the open-load detection fea- ture is not included in the mic2505-1 or -2 versions. the optional open-load detection resistor supplies a small pull-up current to the load when the output switch is off. (a 100k resistor will draw 50 a from a 5v supply.) normally, the load dominates, pulling out low. if the load is absent, the optional resistor pulls out high, activating the fault flag if ctl is off. when a load is switched off with ctl, capacitance on the output may cause the open-load function to pull the flag low until the capacitor is discharged below approximately 2.4v. omit the pull-up resistor when open load detection is not required and for minimum off-state supply current. power bus switch the mic2505/6 family features a mosfet reverse current flow prevention circuit. this prevents current from flowing backwards (from out to in) when ctl is disabled as long as v in is above uvlo minimum. in figure 2, when u1 is on and u2 is off, this feature prevents current flow from the load (5v) backward through u2 to the 3.3v supply. (if a discrete mosfet and driver were used, the mosfet ?s internal body diode would short the 5v load to the 3.3v supply.) flg will be active (low) on any switch that is off whenever the load voltage is greater than the open load threshold (approxi- mately 1v) except for mic2505-1 and mic2505-2. logic-high = 5v output logic-low = 3.3v output u1 mic2505bm load ctl out flg gnd out gate in in +5v 18 27 36 45 0.1f u2 mic2505bm ctl out flg gnd out gate in in 18 27 36 45 +3.3v 0.1f 1n4148 (optional) figure 2. 5v/3.3v switch concept this circuit?s function would otherwise require a dual driver, two mosfets, plus two diodes (or a dual driver plus four mosfets). hot plug-in applications (soft-start) the mic2505/6 family can be used to protect the socket-side and card-side of a supply circuit from transients caused when a capacitive load is connected to an active supply. the switch presents a high impedance when off, and slowly becomes a low impedance as it turns on. this reduces the inrush current and related voltage drop that result from charging a capacitive load. mic2505bm ctl out flg gnd out gate in in 18 27 36 45 0.1f capacitive load 3.3v power control circuitry gnd card socket figure 3. hot plug-in concept a gate capacitor may be added to the mic2505 to slow the turn on time even more, reducing the inrush current. see mic2505 turn-on delay graph. the uvlo feature insures that each time the card is removed and v in = 0 that the gate of the output switch is discharged to zero volts. a controlled turn-on is executed each time a board is plugged in, even with multiple insertions.
mic2505/2506 micrel m9999-062110 10 june 2010 applications information usb application figure 4 depicts a low cost and robust implementation of a four-port, self-powered usb hub circuit employing ganged overcurrent protection. on/off overcurrent mic2505-2/-1 3.3v usb controller v bus d+ d gnd v bus d+ d gnd 100k mic5203-3.3 mic5207-3.3 ldo regulator in out gnd 33f ferrite bead v bus d+ d gnd d+ d v+ en out flg in gnd out gate in bold lines indicate 0.1" wide, 1-oz. copper high-current traces. downstream usb port 1 500ma max. 33f v bus d+ d gnd data v bus d+ d gnd 33f 33f 0.01f 0.01f 0.01f 0.01f 4.7 f 1.0 f gnd 0.1f 4.45v to 5.25v 3.5a max. (+) () 33f downstream usb port 2 500ma max. downstream usb port 3 500ma max. downstream usb port 4 500ma max. figure 4. ganged-switch self-powered hub
june 2010 11 m9999-062110 mic2505/2506 micrel package information 0.380 (9.65) 0.370 (9.40) 0.135 (3.43) 0.125 (3.18) pin 1 dimensions: inch (mm) 0.018 (0.57) 0.100 (2.54) 0.013 (0.330) 0.010 (0.254) 0.300 (7.62) 0.255 (6.48) 0.245 (6.22) 0.380 (9.65) 0.320 (8.13) 0.0375 (0.952) 0.130 (3.30) 8-pin plastic dip (n) 45 08 0.244 (6.20) 0.228 (5.79) 0.197 (5.0) 0.189 (4.8) seating plane 0.026 (0.65) max) 0.010 (0.25) 0.007 (0.18) 0.064 (1.63) 0.045 (1.14) 0.0098 (0.249) 0.0040 (0.102) 0.020 (0.51) 0.013 (0.33) 0.157 (3.99) 0.150 (3.81) 0.050 (1.27) typ pin 1 dimensions: inches (mm) 0.050 (1.27) 0.016 (0.40) 8-pin soic (m)
mic2505/2506 micrel m9999-062110 12 june 2010 micrel, inc. 1849 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com the information furnished by micrel in this data sheet is believed to be accurate and reliable. however, no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is at purchaser s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2004 micrel, incorporated.

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