ADP1111AR Analog Devices, ADP1111AR Datasheet
ADP1111AR
Available stocks
Related parts for ADP1111AR
ADP1111AR Summary of contents
Page 1
... V from input in step-up mode can deliver 200 from input in step-down mode. REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use ...
Page 2
ADP1111–SPECIFICATIONS Parameter QUIESCENT CURRENT INPUT VOLTAGE COMPARATOR TRIP POINT VOLTAGE OUTPUT SENSE VOLTAGE COMPARATOR HYSTERESIS OUTPUT HYSTERESIS OSCILLATOR FREQUENCY DUTY CYCLE SWITCH ON TIME SW SATURATION VOLTAGE STEP-UP MODE STEP-DOWN MODE FEEDBACK PIN BIAS CURRENT SET PIN BIAS CURRENT GAIN ...
Page 3
... ADP1111AN ADP1111AR ADP1111AN- ADP1111AR- Plastic DIP Small Outline Package. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADP1111 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...
Page 4
ADP1111–Typical Characteristics 1.4 1.2 1 0.4 0.2 0 0.1 0.2 0.4 0.6 I CURRENT – A SWITCH Figure 2. Saturation Voltage vs. I Step-Up Mode 2.0 1.8 1.6 1.4 1.2 ...
Page 5
ON TIME 7.1 7.0 6.9 6.8 6.7 6.6 – TEMPERATURE – C Figure 8. Switch ON Time vs. Temperature 58 56 DUTY CYCLE – TEMPERATURE – C ...
Page 6
ADP1111 350 300 BIAS CURRENT 250 200 150 100 50 0 – TEMPERATURE – C Figure 14. Set Pin Bias Current vs. Temperature THEORY OF OPERATION The ADP1111 is a flexible, low-power, switch-mode power supply (SMPS) controller. The ...
Page 7
INDUCTOR SELECTION–STEP-UP CONVERTER In a step-up or boost converter (Figure 18), the inductor must store enough power to make up the difference between the input voltage and the output voltage. The power that must be stored is calculated from the ...
Page 8
ADP1111 As previously mentioned, the switch voltage is higher in step- down mode than in step-up mode current and is therefore a function For most applications value of 1 recommended. SW ...
Page 9
Figure 15. Aluminum Electrolytic Figure 16. Tantalum Electrolytic Figure 17. OS-CON Capacitor If low output ripple is important, the user should consider the ADP3000. Because this device switches at 400 kHz, lower peak current can be used. Also, the higher ...
Page 10
ADP1111 CIRCUIT OPERATION, STEP DOWN (BUCK) MODE) The ADP1111’s step down mode is used to produce an output voltage that is lower than the input voltage. For example, the output of four NiCd cells (+4.8 V) can be converted to ...
Page 11
Input Output Output Voltage Voltage Current ( 6.5 ...
Page 12
ADP1111 This occurs in the step-up mode when the following condition is met OUT DIODE where DC is the ADP1111’s duty cycle. When this relationship exists, the inductor current does not go ...
Page 13
The circuit of Figure 27b may produce multiple pulses when approaching the trip point due to noise coupled into the SET input. To prevent multiple interrupts to the digital logic, hysteresis can be added to the circuit (Figure 27). Resistor ...
Page 14
ADP1111 Voltage-Controlled Positive-to-Negative Converter By including an op amp in the feedback path, a simple positive- to-negative converter can be made to give an output that is a linear multiple of a controlling voltage, Vc. The op amp, an OP196, ...
Page 15
REV. 0 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.325 (8.25) 0.300 (7.62) 0.060 (1.52) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.130 ...
Page 16
–16– ...