LTC1041 BANG-BANG Controller FEATURES DESCRIPTIO n The LTC 1041 is a monolithic CMOS BANG-BANG Micropower 1.5m W (1 Sample/Second) n controller manufactured using Linear Technologys Wide Supply Range 2.8V to 16V enhanced LTCMOS silicon gate process. BANG-BANG n High Accuracy loops are characterized by turning the control element Guaranteed SET POINT Error 0.5mV Max fully ON or fully OFF to regulate the average value of Guaranteed Deadband 0.1% of Value Max the parameter to be controlled. The SET POINT input + n Wide Input Voltage Range V to Ground determines the average control value and the DELTA input n TTL Outputs with 5V Supply sets the deadband. The deadband is always 2 x DELTA and n Two Independent Ground-Referred Control Inputs is centered around the SET POINT. Independent control n Small Size 8-Pin SO of the SET POINT and deadband, with no interaction, is made possible by the unique sampling input structure of U the LTC1041. APPLICATIO S An external RC connected to the OSC pin sets the sampling n rate. At the start of each sample, internal power to the Temperature Control (Thermostats) analog section is switched on for 80m s. During this time, n Motor Speed Control the analog inputs are sampled and compared. After the n Battery Charger comparison is complete, power is switched off. This n Any ON-OFF Control Loop achieves extremely low average power consumption , LTC and LT are registered trademarks of Linear Technology Corporation. at low sampling rates. CMOS logic holds the output LTCMOS is a trademark of Linear Technology Corporation. continuously while consuming virtually no power. To keep system power at an absolute minimum, a switched power output (V ) is provided. External loads, such as P-P bridge networks and resistive dividers, can be driven by this switched output. + The output logic sense (i.e., ON = V ) can be reversed (i.e., ON = GND) by interchanging the V and SET POINT IN inputs. This has no other effect on the operation of the LTC1041. TYPICAL APPLICATIO Supply Current vs Sampling Frequency 10000 Ultralow Power 50 F to 100 F (2.4m W) Thermostat V = 6V S 26V AC 2-WIRE THERMOSTAT 1000 0.1F 4.32k 4.99k 56 1 8 100 TOTAL SUPPLY 2 7 CURRENT 10M 5k I S 10 3 LTC1041 6 400nA 4 5 + 2N6660 6.81k 1 6V LTC1041 SUPPLY 1N4002 1F CURRENT (4) DELTA = 0.5F 0.1 49.9 LTC1041 TA01 0.01 ALL RESISTORS 1%. YELLOW SPRINGS INSTRUMENT CO., INC. P/N 44007. 0.1 1 10 100 1000 10000 DRIVING THERMISTOR WITH V ELIMINATES 3.8F ERROR DUE TO SELF-HEATING P-P SAMPLING FREQUENCY, f (Hz) S LTC1041 TA02 1041fa 1 SUPPLY CURRENT, I (A) S U ULTC1041 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW ORDER PART + Total Supply Voltage (V to V ) .............................. 18V + 1 8 ON / OFF V NUMBER + Input Voltage ........................ (V + 0.3V) to (V 0.3V) 2 7 V V IN P-P LTC1041CN8 Operating Temperature Range 3 6 SET POINT OSC LTC1041CS8 LTC1041C ......................................... 40 C to 85 C 4 5 DELTA GND LTC1041M (OBSOLETE) .................. 55 C to125 C N8 PACKAGE S8 PACKAGE Storage Temperature Range ................. 55 C to 150 C 8-LEAD PDIP 8-LEAD PDIP T = 110C, q = 150C/W (N8) JMAX JA Lead Temperature (Soldering, 10 sec).................. 300 C T = 150C, q = 150C/W (S8) JMAX JA Output Short Circuit Duration .......................Continuous J8 PACKAGE LTC1041MJ8 8-LEAD CERDIP T = 150C, q = 100C/W JMAX JA OBSOLETE PACKAGE Consider the N8 Package as an Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating + temperature range, otherwise specifications are at T = 25 C. Test Conditions: V = 5V, unless otherwise specified. A TC1041M/LTC1041C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS + SET POINT Error (Note 3) V = 2.8V to 6V (Note 2) 0.3 0.5 mV l + + 0.05 0.1 % of DELTA + V = 6V to 15V (Note 2) 1 3mV l + + 0.05 0.1 % of DELTA + Deadband Error (Note 4) V = 2.8V to 6V (Note 2) 0.6 1mV l + + 0.1 0.2 % of DELTA + V = 6V to 15V (Note 2) 2 6 l + + 0.1 0.2 % of DELTA + I Input Current V = 5V, T = 25 C, OSC = GND 0.3 nA OS A , SET POINT and DELTA Inputs) (V IN R Equivalent Input Resistance f = 1kHz (Note 5) l 10 15 MW IN S + Input Voltage Range l GND V V P Power Supply Range l 2.8 16 V SR + I Power Supply ON V = 5V, V ON l 1.2 3 mA S(ON) P-P Current (Note 6) + I Power Supply OFF V = 5V, V OFF LTC1041C l 0.001 0.5 m A S(OFF) P-P Current (Note 6) LTC1041M l 0.001 5 m A + t Response Time (Note 7) V = 5V 60 80 100 m s D ON/OFF Output (Note 8) + V Logical 1 Output Voltage V = 4.75V, I = 360m A l 2.4 4.4 V OH OUT + V Logical 0 Output Voltage V = 4.75V, I = 1.6mA 0.25 0.4 V OL OUT + R External Timing Resistor Resistor Connected between V and OSC Pin l 100 10,000 kW EXT + f Sampling Frequency V = 5V, T = 25 C, 5 Hz S A R = 1M C = 0.1m F EXT EXT Note 2: Applies over input voltage range limit and includes gain Note 1: Absolute Maximum Ratings are those values beyond which the life uncertainty. of a device may be impaired. 1041fa 2 U WWW