ADM1072

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ADM1072 - ADM1072

Dual, Full/Standby Power Controller with Supply Steering Preliminary Technical Data ADM1072
FEATURES 500mA Load Current (100mA Standby Mode) 135m Resistance Switchable Current Limit 50µA Typical Quiescent Current 10nA Typical Shutdown Current 40nA Typical Switch Leakage Short-Circuit Protection Thermal Shutdown Outputs Small, 16-Pin QSOP Package APPLICATIONS Desktop Computers Palmtop Computers Notebook Computers Hand-Held Instruments Universal Serial (USB)
MAIN
ADM1072 logic controlled, dual P-channel switch with resistance built-in current limiter, capable sourcing from supply voltages between 2.7V 5.5V. addition logic inputs that switch each channel off, device standby input that switches output current limit, making ideal with peripherals. normal operating mode Standby mode output current typically limited 500mA 100mA respectively, outlined USB2.0 Specification. This allows system power supply protected against short-circuits surge currents peripheral devices powered ADM1072. Over-current over-temperature conditions signalled fault output (FLT) each channel. ADM1072 also offers quiescent current typically 50µA shutdown current typically 10nA.
MAIN_IN (2.7V 5.5V)
22µF
MIRROR
STBY_IN (2.7V 5.5V)
0.2A MAIN
4.7µF
CHANNEL
0.2A MIRROR MIRROR AMPLIFIER
120µF
CONTROL LOGIC
VPULLUP 5.5V
CURRENT LIMIT AMPLIFIER
1.24V BANDGAP REFERENCE
FLT1
RPULLUP 100k
STBY
UNDERVOLTAGE SENSOR
ADM1072
CURRENT SETTING RESISTOR
VPULLUP 5.5V
TEMPERATURE SENSOR
OVERTEMP
FLT2
RPULLUP 100k
CHANNEL CHANNEL
CHANNEL
CHANNEL IDENTICAL CHANNEL
120µF
FUNCTIONAL BLOCK DIAGRAM
Rev. 1/02
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices.
Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 2002
ADM1072-SPECIFICATIONS
(Specification either channel channel +5.0V, +85oC, unless otherwise noted.)
Parameter Operating Voltage Range Quiescent Current (Total Device) Shutdown Supply Current (Total Device) Undervoltage Lockout Resistance NOMINAL CURRENT-LIMIT Full Power Mode Standby Mode ON1,ON2, STBY Input Voltage, ON1,ON2, STBY Input High Voltage, ON1,ON2, STBY Input Leakage FLT1,FLT2 Logic Output Voltage FLT1,FLT2 Output High Leakage Current Turn-On Time Turn-Off Time 0.05 0.01 +2.7 0.01 +5.5 Units Volts ON1,ON2 GND, IOUT ON1,ON2 5.5V, VOUT VSTBY_IN, Rising Edge, Hysteresis 4.75V 3.0V STBY Note STBY High Note 2.7V 5.5V 2.7V 5.5V VON, VSTBY 5.5V ISINK VFAULT 5.5V IOUT 500mA IOUT 500mA IOUT 500mA Test Conditions/Comments
Notes Current limit specified with VOUT 4.5V. Guaranteed design. Derived from ISET current ratio, current-limit amplifier internal resistor accuraciues. Tested with IOUT 200mA VSET adjusted until (VIN VOUT) 0.8V. Specifications -40oC guaranteed design, tested.
Rev. 1/02
ADM1072
ABSOLUTE MAXIMUM RATINGS*
+25°C unless otherwise noted)
MAIN_IN -0.3V ON1,ON1,FLT1, FLT2 -0.3V OP1,OP2 +0.3 (VIN 0.3V) Maximum Switch Current Full Power Mode Standby Power Mode 200mA Continuous Power Dissipation +70oC) 667mW QSOP (derate 8.3mW/oC above +70oC) Operating Temperature Range Industrial Version) -40°C +85°C Storage Temperature Range -65°C +150°C Lead Temperature (Soldering, sec) +300°C
*This stress rating only functional operation device these other conditions above those indicated operation sections this specification implied. Exposure absolute maximum rating conditions extended periods time affect reliability.
cale)
Configuration
THERMAL CHARACTERISTICS
16-Pin QSOP Package: 105°C/Watt, 40°C/Watt ORDERING GUIDE
Model ADM1072ARQ Temperature Range -40°C +85°C Package Description 16-Pin QSOP Package Option RQ-16 Package
FUNCTION DESCRIPTION
Mnemonic MAIN_IN STBY_IN FLT1
Function Input MAIN P-channel MOSFET source (both channels). Bypass MAIN_IN with 22µF capacitor ground. Input Standby P-channel MOSFET source (both channels) supply chip circuitry. Bypass STBY_IN with 4.7µF capacitor ground. Output from channel P-channel MOSFET drains. Bypass with 120µF capacitor ground. Output from channel P-channel MOSFET drains. Bypass with 120µF capacitor ground. Open-Drain Digital Output. FLT1 goes when channel current limit exceeded 10mS temperature exceeds +150oC. During startup, FLT1 remains turn-on time. Open-Drain Digital Output. FLT2 goes when channel current limit exceeded 10mS temperature exceeds +150oC. During startup, FLT2 remains turn-on time. Ground chip circuits. Digital Input. Active high standby mode input. STBY sets normal operating mode with 500mA current limit. STBY sets standby mode with 100mA current limit. Digital Input. Active-low switch enable channel (logic turns switch on). Digital Input. Active-low switch enable channel (logic turns switch on).
FLT2
STBY
Rev. 1/02
ADM1072
Typical Performance Curves
Figure Quiescent Current Input Voltage
Figure Off-Switch Current Temperature
Figure Quiescent Current Temperature
Figure Normalized Resistance Temperature
Figure Off-Supply Current Temperature
Figure IOUT/ISET Ratio Switch Current
Rev. 1/02
ADM1072
Typical Performance Curves
Figure Normalized Output Current Output Voltage
Figure Fast Current-Limit Response
Figure Turn-On Time Temperature
Figure Slow Current-Limit Response
Figure Turn-Off Time Temperature
Figure Load Transient Response
Rev. 1/02
ADM1072
Typical Performance Curves
Figure Switch Turn-On Time
Figure Circuit Output Rise Time
Figure Switch Turn-Off Time
Figure Circuit output Fall Time
Rev. 1/02
ADM1072
FUNCTIONAL DESCRIPTION SHORT-CIRCUIT PROTECTION
ADM1072 dual, logic-controlled P-channel switch. Each channel ADM1072 comprises P-channel switches. source switch connected "MAIN_IN" input pins switch second switch conected "STBY_IN" pins switch 200mA. device rated provide 500mA continuously full power mode 100mA continuously STBY mode. STBY_IN inputs also provide power chip circuitry must connected supply times. When STBY MAIN switch active when STBY high Standby switch active. Each channel individually controlled active-low logic input (pin (pin 10). When either low, internal circuitry ADM1072 powered output corresponding current-limit amplifier low, providing gate drive switching FET, thus turning When both inputs high, internal circuitry powered down current consumption typically 10nA. should noted that ADM1072 bi-directional switch, must always higher than VOUT. TABLE Truth Table ON1, STBY STBY Channel 500mA 100mA 500mA 100mA Channel 500mA 100mA 500mA 100mA
proportional relationship between main mirror only maintained down output voltage about 1.6V. Below this voltage output current limited approximately ILIMIT. event high dV/dt across switching during short-circuit, switch will turn disconnect input from output. switch then turned slowly with current limited short-circuit value.
THERMAL SHUTDOWN
thermal shutdown operates when temperature exceeds +150oC, turning both channels. thermal shutdown circuit built-in hysteresis 10oC, switch will turn again until temperature falls +140oC. fault condition removed, switch will pulse temperature cycles between these limits.
UNDERVOLTAGE LOCKOUT
undervoltage sensor monitors input supply voltage (ie) voltage STBY_IN. outputs will turn until supply voltage sufficient chip circuits operate reliably. Undervoltage lockout occurs between 2.6V.
OUTPUTS
ADM1072 active-low fault outputs each channel, FLT1 (pin FLT2 (pin current limit exceeded greater than 10mS, corresponding output will pull low. thermal shutdown activated, both outputs will pull low. outputs open-drain require pullup resistor between 100k Several outputs wire-OR'd form common interrupt line, shown Figure outputs wire-OR'd existing interrupt line that resistive pullup.
BOTH SHUT DOWN
don't care
CURRENT LIMIT
When either Main Standby switch turned smaller mirror switch passes proportionate current equal IOUT/ 1000. mirror amplifier maintains this relationship keeping drain mirror same voltage main FET, drives mirror current through internal current-limit resistor, which connected between noninverting input current limit amplifier ground. on-chip bandgap reference 1.24V connected inverting input current-limit amplifier. When load current exceeds preset limit, voltage across currentlimit resistor exceeds 1.24V output voltage current-limit amplifier rises, reducing gate drive FETs. selecting between Standby Main FETs their associated mirror FETs, STBY input allows different values current limit specified USB2.0 selected. This feature particularly useful when driving peripherals from host system such that into powersaving mode, since limits current that peripherals attempt draw from host power supply. Rev. 1/02
1072
Figure Wire Or'ing FAULT Outputs
During startup, output goes turn-on time.
ADM1072
APPLICATIONS INFORMATION INPUT FILTERING
prevent input voltage being pulled below minimum operating voltage under transient short-circuit conditions, before current limit time operate, reservoir capacitor should connected from MAIN_IN GND. This does need large, should have ESR. value around 22µF suitable. Larger values will reduce voltage drop still further. STBY_IN input requires proportionately smaller value, typically 4.7µF.
OUTPUT CAPACITANCE
120µF capacitors should connected between prevent back e.m.f. parasitic inductance from pulling below ground during turn-off provide adequate turn- current Universal Serial (USB) applications that plugged OP2. This causes output rise fall times longer, shown typical operating characteristics, does affect turn-off time ADM1072 itself.
LAYOUT CONSIDERATIONS
Printed circuit board tracks from ADM1072 should thick short possible minimise parasitic inductance take full advantage fast response time switch. Input output capacitors should placed close device possible (less than 5mm).
THERMAL CONSIDERATIONS
Under normal operating conditions, worst-case power dissipation will 135mW with 135m resistance supply (1A)2 0.135 package capable handling dissipating this power, heat dissipation further improved providing large area copper contact with device pins, particularly MAIN_IN OP1,OP2.
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
16-Pin QSOP Package (RQ-16)
0.197 (5.00) 0.189 (4.80)
0.157 (3.99) 0.150 (3.81)
0.244 (6.20) 0.228 (5.79)
0.059 (1.50) 0.069 (1.75) 0.053 (1.35)
0.010 (0.25) 0.004 (0.10)
0.025 (0.64)
0.012 (0.30) 0.008 (0.20)
0.010 (0.20) 0.007 (0.18)
0.050 (1.27) 0.016 (0.41)
Rev. 1/02

ADM1072

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