EM MICROELECTRONIC-MARIN SA A6155 High Efficiency Linear Power Supply with Extremely Accurate Power Surveillance, Software Monitoring and Sleep Mode Detection Features Can-bus sleep mode detector Highly accurate 5 V, 100 mA guaranteed output Low dropout voltage, typically 380 mV at 100 mA Low quiescent current, typically 155 µA Standby mode, maximum current 350 µA (with 100 µA load on OUTPUT) Unregulated DC input can withstand –20 V reverse battery and + 60 V power transients Fully operational for unregulated DC input voltage up to 26 V and regulated output voltage down to 3.0 V Reset output guaranteed for regulated output voltage down to 1.2 V No reverse output current Very low temperature coefficient for the regulated output Current limiting Comparator for voltage monitoring,voltage reference 1.275 V ±2.0% voltage reference accuracy at +25 °C (3 to 5.5 V) ±2.7% voltage reference accuracy from –40 to +85 °C (3 to 5.5 V) Programmable reset voltage monitoring Programmable power-on reset (POR ) delay Watchdog with programmable time windows guarantees a minimum time and a maximum time between software clearing of the watchdog Time base accuracy ± 10% System enable output offers added security TTL/CMOS compatible -40 to +85 °C temperature range DIP8 and SO8 packages state for a regulated output voltage as low as 1.2 V. The watchdog function monitors software cycle time and execution. If software clears the watchdog too quickly (incorrect cycle time) or too slowly (incorrect execution) it will cause the system to be reset. The system enable output prevents critical control functions being activated until software has successfully cleared the watchdog three times. Such a security could be used to prevent motor controls being energized on repeated resets of a faulty system. If the microcontroller does not work that means no signal on the TCL input the A6155 goes in a standby mode (CAN-bus sleep detector). Applications Automotive systems Cellular telephones Security systems Battery powered products High efficiency linear power supplies Industrial electronics Typical Operating Configuration Unregulated voltage A6155 Description The A6155 offers a high level of integration by combining voltage regulation, voltage monitoring and software monitoring in an 8 lead package. The voltage regulator has a low dropout voltage (typ. 380 mV at 100 mA) and a low quiescent current (155 µA). The quiescent current increases only slightly in dropout prolonging battery life. Built-in protection includes a positive transient absorber for up to 60 V (load dump) and the ability to survive an unregulated input voltage of –20 V (reverse battery). The input may be connected to ground or a reverse voltage without reverse current flow from the output to the input. A comparator monitors the voltage applied at the VIN input comparing it with an internal 1.275 V reference. The power-on reset function is initialized after VIN reaches 1.275 V and takes the reset output inactive after TPOR depending of external resistance. The reset output goes active low when the VIN voltage is less than 1.275 V. The RES and EN outputs are guaranteed to be in a correct 5V INPUT OUTPUT R VSS VIN TCL RES EN GND Fig. 1 Pin Assignment DIP8/ SO8 EN RES TCL VSS V IN A6155 R OUTPUT INPUT Fig. 2 1 A6155 Absolute Maximum Ratings Parameter Continuous voltage at INPUT to VSS Transients on INPUT for t < 100 ms and duty cycle 1% Reverse supply voltage on INPUT Max. voltage at any signal pin Min. voltage at any signal pin Storage temperature Electrostatic discharge max. to MIL-STD-883C method 3015 Max. soldering conditions Symbol Operating Conditions Conditions VINPUT -0.3 to + 30 V VTRANS VREV VMAX VMIN TSTO up to + 60 V - 20 V OUTPUT + 0.3 V VSS – 0.3 V -65 to + 150 °C VSmax TSmax 1000 V 250 °C x 10 s Parameter Operating junction temperature 1) INPUT voltage 2) OUTPUT voltage 2)3) RES & EN guaranteed 4) OUTPUT current 5) Comparator input voltage RC-oscillator programming Thermal resistance from junction to ambient 6) -DIP8 -SO8 Table 1 Stresses above these listed maximum ratings may cause permanent damage to the device. Exposure beyond specified operating conditions may affect device reliability or cause malfunction. 1) Handling Procedures 2) This device has built-in protection against high static voltages or electric fields; however, anti-static precautions should be taken as for any other CMOS component. Unless otherwise specified, proper operation can only occur when all terminal voltages are kept within the supply voltage range. At any time, all inputs must be tied to a defined logic voltage level. Min. TJ VINPUT VOUTPUT VOUTPUT IOUTPUT -40 2.3 1.2 1.2 Typ. Max. +85 26 Units 100 °C V V V mA VIN 0 VOUTPUT V R 10 1000 kΩ 105 160 °C/W °C/W Rth(j-a) Rth(j-a) Table 2 3) 4) 5) 6) 2 Symbol The maximum operating temperature is confimed by sampling at initial device qualification. In production, all devices are tested at +85 °C. Full operation quaranteed. To achieve the load regulation specified in Table 3 a 22 µF capacitor or greater is required on the INPUT, see Fig. 8. The 22 µF must have an effective resistance ≤ 5 Ω and a resonant frequency above 500 kHz. A 10 µF load capacitor and a 100 nF decoupling capacitor are required on the regulator OUTPUT for stability. The 10 µF must have an effective series resistance of ≤ 5 Ω and a resonant frequency above 500 kHz. RES must be pulled up externally to VOUTPUT even if it is unused. (Note: RES and EN are used as inputs by EM test). The OUTPUT current will not apply for all possible combinations of input voltage and output current. Combinations that would require the A6155 to work above the maximum junction temperature (+85 °C) must be avoided. The thermal resistance specified assumes the package is soldered to a PCB. A6155 Electrical Characteristics VINPUT = 6.0 V, CL = 10 µF + 100 nF, CINPUT = 22 µF, TJ = -40 to +85 °C, unless otherwise specified Parameter Symbol Supply current in standby mode ISS (switched to RINT) Supply current 1) ISS Supply current 1) ISS Output voltage Output voltage VOUTPUT VOUTPUT Output voltage temperature Coefficient 2) Line regulation 3) Vth(coeff) VLINE Load regulation 3) Dropout voltage 4) Dropout voltage 4) Dropout voltage 4) Dropout supply current VL VDROPOUT VDROPOUT VDROPOUT ISS Thermal regulation 5) Vthr Current limit ILmax OUTPUT noise, 10Hz to 100kHz VNOISE Test Conditions Min. Typ. REXT = don’t care, TCL = VOUTPUT, VIN = VOUTPUT, IL = 100 µA O/PS 1 MΩ to VOUTPUT REXT = 100 kΩ, I/PS at VOUTPUT, O/PS 1 MΩ to VOUTPUT, IL = 100 µA 155 REXT = 100 kΩ, I/PS at VOUTPUT, VINPUT = 8.0 V, O/PS 1 MΩ to VOUTPUT, IL = 100 mA 1.7 IL = 100 µA 4.88 100 µA ≤ IL ≤ 100 mA, -40 °C ≤ TJ ≤+85 °C 4.85 6 V ≤ VINPUT ≤26 V, IL = 1 mA, TJ = +85 °C 100 µA ≤ IL ≤ 100 mA IL = 100 µA IL = 100 mA IL = 100 mA, -40 °C ≤ TJ ≤+85 °C VINPUT = 4.5 V, IL = 100 µA, REXT = 100 kΩ, O/PS 1 MΩ to VOUTPUT, I/PS at VOUTPUT TJ = +25 °C, IL = 50 mA, VINPUT = 26 V, T = 10 ms OUTPUT tied to VSS Max. Unit 350 µA 400 µA 4.2 5.12 mA V 5.15 V 50 180 ppm/°C 0.2 0.2 40 380 0.5 0.6 170 650 % % mV mV mV 1.2 1.6 mA 0.05 450 200 0.25 %/W mA µVrms 3.0 ≤ VOUTPUT ≤ 5.5 V, IL = 100 µA, CL = 10 µF + 100 nF, CINPUT = 22 µF, TJ = -40 to +85 °C, unless otherwise specified RES and EN Output Low Voltage EN Output High Voltage TCL and VIN TCL Input Low Level TCL Input High Level Leakage current TCL input VIN input resistance Comparator reference 6)7) Comparator hysteresis 7) VOL VOL VOL VOL VOUTPUT = 4.5 V, IOL= 20 mA VOUTPUT = 4.5 V, IOL = 8 mA VOUTPUT = 2.0 V, IOL = 4 mA VOUTPUT = 1.2 V, IOL = 0.5 mA VOH VOH VOH VOUTPUT = 4.5 V, IOH= -1 mA VOUTPUT = 2.0 V, IOH= -100 µA VOUTPUT = 1.2 V, IOH= -30 µA VIL VIH ILI RVIN VREF VREF VHY VSS ≤ VTCL ≤ VOUTPUT TJ = +25 °C 0.4 0.2 0.2 0.06 3.5 1.8 1.0 0.4 0.4 0.2 4.1 1.9 1.1 VSS 2.0 0.8 VOUTPUT 0.05 1 100 1.25 1.275 1.30 1.24 1.31 2 V V V V V V V V V µA MΩ V V mV Table 3 If INPUT is connected to VSS, no reverse current will flow from the OUTPUT to the INPUT, however the supply current specified will be sank by the OUTPUT to supply the A6155. 2) The OUTPUT voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. 3) Regulation is measured at constant junction temperature using pulse testing with a low duty cycle. Changes in OUTPUT voltage due to heating effects are covered in the specification for thermal regulation. 4) The dropout voltage is defined as the INPUT to OUTPUT differential, measured with the input voltage equal to 5.0 V. 5) Thermal regulation is defined as the change in OUTPUT voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. 6) The comparator and the voltage regulator have separate voltage references (see “ Block Diagram” Fig. 8). 7) The comparator reference is the power-down reset threshold. The power-on reset threshold equals the comparator reference voltage plus the comparator hysteresis (see Fig. 5). 1) 3 A6155 Timing Characteristics V INPUT = 6.0 V, IL = 100 µA, CL = 10 µF + 100 nF, CINPUT = 22 µF, TJ = -40 to + 85 °C, unless otherwise specified Parameter Symbol Test Conditions Propagation delays: TCL to Output Pins VIN sensitivity Logic Transition Times on all Output Pins Power-on Reset delay Watchdog Time Open Window Percentage Closed Window Time TDIDO TSEN TTR TPOR TWD OWP TCW TCW Open Window Time TOW TOW Watchdog Reset Pulse TWDR TWDR TCL Input Pulse Width TTCL Reset Pulse when switched to R internal TRI Watchdog Reset Pulse with R internal (RI) TRIR Min. 1 Load 10 kΩ, 50 pF REXT = 110 kΩ, ±1% REXT = 110 kΩ, ±1% 90 90 REXT = 110 kΩ, ±1% 72 REXT = 110 kΩ, ±1% 36 REXT = 110 kΩ, ±1% 150 0.3 Typ. Max. Units 250 5 30 100 100 ±0.2 TWD 0.8 TWD 80 0.4 TWD 40 TWD/40 2.5 500 20 100 110 110 ns µs ns ms ms 88 ms 44 ms 0.9 TRI/320 2.3 ms ns s s Table 4 TRI versus Temperature at VOUTPUT = 5 V 2.5 TRI [s] 2.0 1.5 1.0 0.5 0 -40 +85 +25 +125 TJ [°C] Fig.3 Timing Waveforms Watchdog Timeout Period TWD = TPOR Watchdog timer reset TCW – closed window TOW – open window t [ms] 80 4 Condition: REXT = 110 kΩ + OWP + 20% − OWP − 20% 100 120 Fig. 4 A6155 Voltage Monitoring VHY VIN Conditions: VOUTPUT ≥ 3 V No timeout VREF TSEN TSEN TSEN TSEN TPOR TPOR RES Fig. 5 Timer Reaction TCW TOW TCW +TOW TCW TCL TCW + TOW TCW + TOW TTCL TRI RES EN Conditions: VIN > VREF after power-up sequence TCW + TOW 2 TWDR TRIR TWDR 1 TCW + TOW 3 3 correct TCL services →EN goes active low After 3 reset pulse periods → switch to R internal Timeout - Watchdog timer reset After one edge (falling or rising) on TCL input → switch to R input Fig. 6 Combined Voltage and Timer Reaction VIN VREF TPOR=TWD TCL TOW Condition: VOUTPUT ≥ 3 V TCW TRI TCW+TOW TRIR RES EN 1 - Watchdog timer reset TCL too early 2 3 3 correct TCL services →EN goes active low After 3 reset pulse periods → switch to R internal Fig. 7 5 A6155 Block Diagram Voltage Regulator INPUT Voltage Reference OUTPUT VREF Comparator Voltage Reference Enable Logic EN Reset Control RES VIN Current Controlled Oscillator R R1∼ 1 MΩ Switch Timer Controller Open drain output RES TCL Fig. 8 Pin Description Pin Name 1 EN 2 RES 3 4 5 6 7 8 Function Push-pull active low enable output Open drain active low reset output. RES must be pulled up to VOUTPUT even if unused TCL Watchdog timer clear input signal VSS GND terminal INPUT Voltage regulator input OUTPUT Voltage regulator output R REXT input for RC oscillator tuning VIN Voltage comparator input Table 5 Functional Description Voltage Regulator The A6155 has a 5 V ± 2%, 100 mA, low dropout voltage regulator. The low supply current (typ.155 µA) makes the A6155 particularly suited to automotive systems then remain energized 24 hours a day. The input voltage range is 2.3 V to 26 V for operation and the input protection includes both reverse battery (20 V below ground) and load dump (positive transients up to 60 V). There is no reverse current flow from the OUTPUT to the INPUT when the INPUT equals VSS. This feature is important for systems which need to implement (with capacitance) a minimum power supply hold-up time in the event of power failure. To achieve good load regulation a 22 µF capacitor (or greater ) is needed on the INPUT (see Fig.9). Tantalum or aluminium electrolytics are adequate for the 22 µF capacitor; film types will work but are relatively expensive. Many aluminium electrolytics have electrolytes that freeze at about –30 °C, so tantalums are recommended for operation below –25 °C. The important parameters of the 22 µF capacitor are an effective series 6 resistance of ≤ 5 Ω and a resonant frequency above 500 kHz.. A 10 µF capacitor (or greater) and a 100 nF capacitor are required on the OUTPUT to prevent oscillations due to instability. The specification of the 10 µF capacitor is as per the 22 µF capacitor on the INPUT (see previous paragraph). The A6155 will remain stable and in regulation with no external load and the dropout voltage is typically constant as the input voltage fall to below its minimum level (see Table 2). These features are especially important in CMOS RAM keep-alive applications. Care must be taken not to exceed the maximum junction temperature (+ 85 °C). The power dissipation within the A6155 is given by the formula: PTOTAL = (VINPUT – VOUTPUT) * IOUTPUT + (VINPUT) * ISS The maximum continuous power dissipation at a given temperature can be calculated using the formula: PMAX = ( 85 °C – TA) / Rth(j-a) where Rth(j-a) is the termal resistance from the junction to the ambient and is specified in Table 2. Note the Rth(j-a) given in Table 2 assumes that the package is soldered to a PCB. The above formula for maximum power dissipation assumes a constant load (ie. ≥100 s). The transient thermal resistance for a single pulse is much lower than the continuous value. For example the A6155 in DIP8 package will have an effective thermal resistance from the junction to the ambient of about 10°C/W for a single 100 ms pulse. VIN Monitoring The power-on reset and the power-down reset are generated as a response to the external voltage level applied on the VIN input. The VDD voltage at which reset is asserted or released is determined by the external voltage divider between VDD and VSS, as shown on Fig. 9. A part of VDD is compared to the internal voltage reference. To determine the values of the divider, the leakage current at VIN must be taken into account, as A6155 well as the current consumption of the divider itself. Low resistor values will need more current, but high resistor values will make the reset threshold less accurate at high temperature, due to a possible leakage current at the VIN input. The sum of the two resistors should stay below 300 kΩ. The formula is: VRESET = VREF *(1 + R1/R2). Example: choosing R1 = 100 kΩ and R2 = 39 kΩ will result in a VDD reset threshold of 4.54 V (typ.). At power-up the reset output (RES) is held low (see Fig. 5). After INPUT reaches 3.36 V (and so OUTPUT reach-es at least 3 V) and VIN becomes greater than VREF, the RES output is held low for an additional power-onreset (POR) delay which is equal to the watchdog time TWD (typically 100 ms with an external resistor of 110 kΩ con-nected at R pin). The POR delay prevents repeated togging of RES even if VIN and the INPUT voltage drops out and recovers. The POR delay allows the microprocessor’s crystal oscillator time to start and stabilize and ensures correct recognition of the reset signal to the microprocessor. The RES output goes active low generating the powerdown reset whenever VIN falls below VREF. The sensitivity or reaction time of the internal comparator to the voltage level on VIN is typically 5 µs. Timer Programming The on-chip oscillator with an external resistor REXT connected between the R pin and VSS (see Fig. 9) allows the user to adjust the power-on reset (POR) delay, watchdog time TWD and with this also the closed and open time windows as well as the watchdog reset pulse width (TWD/40). With REXT = 110 kΩ typical values are: -Power-on reset delay: TPOR is 100 ms -Watchdog time: TWD is 100 ms -Closed window: TCW is 80 ms -Open window: TOW is 40 ms -Watchdog reset: TWDRis 2.25 ms Note the current consumption increases as the frequency increases. Watchdog Timeout Period Description The watchdog timeout period is divided into two parts, a “closed” window and an “open” window (see Fig. 4) and is defined by two parameters, TWD and the Open Window Percentage (OWP). The closed window starts just after the watchdog timer resets and is defined by TCW = TWD – OWP(TWD). The open window starts after the closed time window finishes and lasts till TWD + OWP(TWD).The open window time is defined by TOW = 2 x OWP (TWD) For example if TWD = 100 ms (actual value) and OWP = ± 20% this means the closed window lasts during first the 80 ms (TCW = 80 ms = 100 ms – 0.2 (100 ms)) and the open window the next 40 ms (TOW = 2 x 0.2 (100 ms) = 40 ms). The watchdog can be serviced between 80 ms and 120 ms after the timer reset. However as the time base is ± 10% accurate, software must use the following calculation for servicing signal TCL during the open window: Related to curves (Fig. 10 to Fig. 21), especially Fig. 20 and Fig. 21, the relation between TWD and REXT could easely be defined. Let us take an example describing the variations due to production and temperature: 1. Choice, TWD = 26 ms. 2. Related to Fig. 21, the coefficient (TWD to REXT) is 1.025 where REXT is in kΩ and TWD in ms. 3. REXT (typ.) = 26 x 1.025 =26.7 kΩ. 4. 26 ms at +25 °C a) b) (26 − 10% = 23.4 ms) (26 + 10% = 28.6 ms)a) (23.4 − 5% = 22.2 ms) (28.6 + 5% = 30.0 ms)b) min.: (30.0 − 20% = 24.0 ms) max.: (22.2 + 20% = 26.7 ms) Typical TCL period of (24.0 + 26.7) / 2 = 25.4 ms The ratio between TWD = 26 ms and the (TCL period) = 25.4 ms is 0.975. Then the relation over the production and the full temperature range is, TCL period = 0.975 x TWD or 0.975 x REXT TCL period = , as typical value. 1.025 a)While PRODUCTION value unknown for the customer when REXT ≠ 110 kΩ. b)While operating TEMPERATURE range -40 °C ≤ TJ ≤ +85 °C. 5. If you fixed a TCL period = 26 ms 26 x 1.025 ⇒ REXT = = 27.3 kΩ. 0.975 If during your production the TWD time can be measured at TJ = + 25 °C and the µC can adjust the TCL period, then the TCL period range will be much larger for the full operating temperature. Timer Clearing and RES Action The watchdog circuit monitors the activity of the processor. If the user’s software does not send a pulse to the TCL input within the programmed open window timeout period a short watchdog RES pulse is generated which is equal to TWD /40 = 2.5 ms typically (see Fig. 6). With the open window constraint new security is added to conventional watchdogs by monitoring both software cycle time and execution. Should software clear the watchdog too quickly (incorrect cycle time) or too slowly (incorrect execution) it will cause the system to be reset. If software is stuck in a loop which includes the routine to clear the watchdog then a conventional watchdog would not make a system reset even though software is malfunctioning; the A6155 would make a system reset because the watchdog would be cleared too quickly. If no TCL signal is applied before the closed and open windows expire, RES will start to generate square waves of period (TCW + TOW + TWDR). The watchdog will remain in this state until the next TCL falling edge appears 7 A6155 during an open window,or until a fresh power-up sequence. The system enable output, EN , can be used to prevent critical control functions being activated in the event of the system going into this failure mode (see section “Enable-EN Output”). The RES output must be pulled up to VOUTPUT even if that output is not used by the system (see Fig 9). Combined Voltage and Timer Action The combination of voltage and timer actions is illustrated by the sequence of events shown in Fig. 7. On power-up, when the voltage at VIN reaches VREF, the poweron-reset, POR, delay is initialized and holds RES active for the time of the POR delay. A TCL pulse will have no effect until this power-on-reset delay is completed. When the risk exists that TCL temporarily floats, e.g. during TPOR, a pull-up to VDD is required on that pin. After the POR delay has elapsed, RES goes inactive and the watchdog timer starts acting. If no TCL pulse occurs, RES goes active low for a short time TWDR after each closed and open window period. A TCL pulse coming during the open window clears the watchdog timer. When the TCL pulse occurs too early (during the closed window), RES goes active and a new timeout sequence starts. A voltage drop below the VREF level for longer than typically 5 µs overrides the timer and immediately forces RES active and EN inactive. Any further TCL pulse has no effect until the next power-up sequence has completed. Enable - EN Output The system enable output, EN , is inactive always when RES is active and remains inactive after a RES pulse until the watchdog is serviced correctly 3 consecutive 8 times (ie. the TCL pulse must come in the open window). After three consecutive services of the watchdog with TCL during the open window, the EN goes active low. A malfunctioning system would be repeatedly reset by the watchdog. In a conventional system critical motor controls could be energized each time reset goes inactive (time allowed for the system to restart) and in this way the electrical motors driven by the system could function out of control. The A6155 prevents the above failure mode by using the EN output to disable the motor controls until software has successfully cleared the watchdog three times (ie. the system has correctly restarted after a reset condition). CAN -Bus Sleep Mode Detector If the microcontroller is in standby mode that means it does not have any pulses on the TCL input. After 3 reset pulse periods (TCW + T OW + TWDR) on the RES output, the A6155 switches on an internal resistor of 1 MΩ, and it will have a reset pulse of typically 3 ms every 1 second on the RES output. When a TCL edge (rising or falling) appears on the TCL input or the power supply goes down and up, the A6155 switches to the R input. A6155 Typical Application Regulated voltage Unregulated voltage INPUT 22 µF + 100 kΩ OUTPUT A6155 R 100 nF + 10 µF R1 Address Decoder VIN TCL RES EN VSS RES R2 EN µP Motor Controls GND Fig.9 OUTPUT Current versus INPUT Voltage SO8 package soldered to PC board TJmax = + 125 °C 100 OUTPUT current [mA] 80 60 TA=+50 °C TA=+25 °C 40 TA=+85 °C 20 0 0 5 10 15 20 25 30 INPUT voltage [V] Fig.10 9 A6155 VREF versus VOUTPUT at TJ = -40 °C, +25 °C, +85 °C VREF versus VOUTPUT at TJ = -40 °C, +25 °C, +85 °C 2.0 1.290 1.8 1.285 1.6 1.4 1.280 1.2 TJ = +25 °C VREF [V] VREF [V] TJ = -40 °C TJ = -40 °C 1.0 TJ = +25 °C 1.275 0.8 TJ = +85 °C 1.270 0.6 TJ = +85 °C 0.4 1.265 0.2 1.260 0.0 1.5 2.5 3.5 4.5 5.5 VOUTPUT [V] 6.5 1 7.5 3 4 5 6 VOUTPUT [V] Fig. 11 VREF versus Temperature at VOUTPUT =3 V,5 V and 8 V 7 8 Fig. 12 VREF versus Temperature at VOUTPUT =3 V,5 V and 8 V 1.280 1.50 1.45 VOUTPUT = 5 V 1.275 VOUTPUT = 3 V 1.40 1.270 1.35 VOUTPUT = 8 V 1.25 VREF [V] 1.30 VREF [V] 2 VOUTPUT = 5 V and 3 V 1.265 1.260 1.20 VOUTPUT = 8 V 1.15 1.255 1.10 1.250 1.05 1.245 1.00 -50 -25 0 +25 +50 +75 +100 +125 TJ [°C] 10 Fig. 13 -50 -25 0 +25 +50 TJ [°C] +75 +100 +125 Fig. 14 A6155 TWD versus Supply Voltage at TJ ≤ +85 °C TWD versus VOUTPUT at TJ = 125 °C 100000 100000 R = 10 MΩ R = 10 MΩ 10000 10000 R = 1 MΩ TWD [ms] TWD [ms] R = 100 kΩ 100 5 4 3 6 R = 100 kΩ 100 R = 10 kΩ 10 R = 1 MΩ 1000 1000 R = 10 kΩ 10 7 VOUTPUT[V] 3 8 4 7 VOUTPUT[V] Fig. 15 TWD versus Temperature at VOUTPUT = 5 V 6 5 8 Fig. 16 TWD versus R at VOUTPUT = 5 V 10000 100000 TJ =+125 °C R = 10 MΩ 1000 10000 R = 1 MΩ 100 TWD [ms] TWD [ms] 1000 R = 100 kΩ 100 10 TJ ≤ +85 °C R = 10 kΩ 10 -40 -15 +35 +60 TJ[°C] +10 1 +85 +110 Fig. 17 1 10 100 R [kΩ] 1000 10000 Fig. 18 11 A6155 TWD versus R at VOUTPUT = 5 V 10 000 TJ = +125 °C TJ ≤ +85 °C TWD [ms] 1 000 100 10 1 1 10 100 R [kΩ] 12 1000 10000 Fig. 19 A6155 TWD Coefficient versus REXT at TJ = + 25 °C 1.10 1.08 1.06 1.04 TWD Coefficient 1.02 1.00 0.98 0.96 0.94 0.92 0.90 0.88 0.86 10 100 REXT [kΩ] 1000 Fig. 20 REXT Coefficient versus TWD at TJ = + 25 °C 1.16 1.14 1.12 REXT Coefficient 1.10 1.08 1.06 1.04 1.02 1.00 0.98 0.96 0.94 0.92 0.90 10 100 TWD [ms] 1000 Fig. 21 13 A6155 Package Information Dimensions of 8-Pin SOIC Package E D e 4 3 2 5 6 7 C A A1 0 - 8° L B H Dimensions in mm Min Nom Max A 1.35 1.63 1.75 A1 0.10 0.15 0.25 B 0.33 0.41 0.51 C 0.19 0.20 0.25 D 4.80 4.94 5.00 E 3.80 3.94 4.00 e 1.27 H 5.80 5.99 6.20 L 0.40 0.64 1.27 8 Fig. 22 Dimensions of 8-Pin Plastic DIP Package A1 A2 A C L b3 eA eB e b2 Dimensions in mm b 4 3 2 1 E1 5 6 7 8 E A A1 A2 b b2 b3 C Min. Nom. Max. 5.33 0.38 2.92 3.30 4.95 0.35 0.45 0.56 1.14 1.52 1.78 0.76 0.99 1.14 0.20 0.25 0.35 D E E1 e eA eB L Min. Nom. Max. 9.01 9.27 10.16 7.62 7.87 8.25 6.09 6.35 7.11 2.54 7.62 10.92 2.92 3.30 3.81 Fig. 23 14 A6155 Ordering Information When ordering please specify complete Part Number. Part Number Package Delivery Form A6155DL8A A6155SO8A A6155SO8B 8-pin plastic DIP 8-pin SOIC 8-pin SOIC Stick Stick Tape & Reel Package Marking (first line) A6155 I 6155A 6155A EM Microelectronic-Marin SA cannot assume any responsibility for use of any circuitry described other than entirely embodied in an EM Microelectronic-Marin SA product. EM Microelectronic-Marin SA reserves the right to change the circuitry and specifications without notice at any time. You are strongly urged to ensure that the information given has not been superseded by a more up-to-date version. © 2002 EM Microelectronic-Marin SA, 03/02, Rev. E/346 15 EM Microelectronic-Marin SA, CH - 2074 Marin, Switzerland, Tel. +41 – (0)32 75 55 111, Fax +41 – (0)32 75 55 403