ISL78022 Intersil Corporation, ISL78022 Datasheet
ISL78022
Related parts for ISL78022
ISL78022 Summary of contents
Page 1
... V V applications. GAMMA The boost converter in the ISL78020 and ISL78022 is a current mode PWM type integrating an 18V N-Channel MOSFET. Operating at 1.2MHz, this boost converter can operate in either P-Mode for superior transient response PI-Mode for tighter output regulation. ...
Page 2
... Pinouts ISL78020 (32 LD TQFP) TOP VIEW www.datasheet4u.com SRC 1 REF 2 AGND 3 PGND 4 OUT1 5 NEG1 6 POS1 NOT INTERNALLY CONNECTED IC = INTERNALLY CONNECTED 2 ISL78020, ISL78022 SRC 1 24 COMP REF AGND PGND OUT1 NEG1 POS1 OUT2 ISL78022 ...
Page 3
... LX Leakage Current LEAK Current Limit LIM t B Soft-Start Period SS 3 ISL78020, ISL78022 Thermal Information (T = +25°C) A COM, DRN to AGND . . . . . . . . . . . . . . . . . . . . -0. 0.3V LX Maximum Continuous RMS Output Current 1.6A IN OUT1, OUT2, OUT3, OUT4, OUT5 Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Maximum Continuous Junction Temperature . . . . . . . . . . . . +125°C Power Dissipation ...
Page 4
... DRVN Off Leakage Current LEAK t N Soft-start Period SS V -SLICE CIRCUIT ON V CTL Input Low Voltage LO V CTL Input High Voltage HI 4 ISL78020, ISL78022 = 3V 12V 20V, limits over -40°C to +105°C temperature range, unless IN BOOST SUP SRC CONDITIONS I = 100µA OUT I = 5mA OUT I = -100µ ...
Page 5
... Turn-On Delay ON t Delay Between V DEL1 t Delay Between V DEL2 t Delay From V DEL3 Enabled 5 ISL78020, ISL78022 = 3V 12V 20V, limits over -40°C to +105°C temperature range, unless IN BOOST SUP SRC CONDITIONS CTL = AGND or IN 1kΩ from DRN to 8V, V step, no load on OUT, measured from ...
Page 6
... DRVP 26 FBN 27 DRVN 28 DEL 29 CTL 30 DRN 31 COM 32 6 ISL78020, ISL78022 ISL78020 1 Upper reference voltage for switch output 2 Internal reference bypass terminal 3 Analog ground for boost converter and control circuitry 4 Power ground for boost switch 5 Operational amplifier 1 output 6 Operational amplifier 1 inverting input 7 ...
Page 7
... LOAD CURRENT (mA) FIGURE 3. BOOST LOAD REGULATION vs LOAD CURRENT (PI-MODE) 0.12 0.10 0.08 0.06 0.04 0.02 0 3.0 3.5 4.0 INPUT VOLTAGE (V) FIGURE 5. BOOST LINE REGULATION vs INPUT VOLTAGE (PI-MODE) 7 ISL78020, ISL78022 T = +25°C, unless otherwise specified 800 1000 1200 = 12V (PI-MODE) OUT 800 1000 1200 4.5 5.0 5.5 6 ...
Page 8
... INPUT VOLTAGE (V) FIGURE 9. V LINE REGULATION ON 0 -0.1 -0.2 -0.3 -0 -8V -0.5 OFF I = 50mA LOAD -0.6 -15 -14 -13 INPUT VOLTAGE (V) FIGURE 11. V LINE REGULATION OFF 8 ISL78020, ISL78022 T = +25°C, unless otherwise specified. (Continued 12V BOOST C = 30µF OUT V = 20V 20mA LOAD -12 -11 - 20V ON -0 ...
Page 9
... TIME (20ms/DIV) FIGURE 13. START-UP SEQUENCE FIGURE 15. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Applications Information The ISL78020 and ISL78022 provide a highly integrated multiple output power solution for TFT-LCD applications. The system consists of one high efficiency boost converter and two low cost linear-regulator controllers ( with multiple protection functions ...
Page 10
... LCD panel design. The boost converter can operate in continuous or discontinuous inductor current mode. The ISL78020 and ISL78022 are designed for continuous current mode, but they can also operate in discontinuous current mode at light load. In continuous current mode, current flows continuously in the inductor during the entire switching cycle in steady state operation ...
Page 11
... OMAX LMT www.datasheet4u.com REF FBB 11 ISL78020, ISL78022 Where Δ peak to peak inductor ripple current, and is set by Equation 4: (EQ. 3) where f CLOCK SLOPE COMPENSATION CURRENT AMPLIFIER GM AMPLIFIER REFERENCE GENERATOR COMP FIGURE 17. THE BLOCK DIAGRAM OF THE BOOST CONTROLLER ...
Page 12
... Compensation 1.2 1360 The ISL78020 and ISL78022 can operate in either P-Mode or PI-Mode. P-mode may be preferred in applications where 1.2 944 excellent transient load performance is required but 1.2 694 regulation is not critical. Connecting COMP pin directly to V PI-Mode with a 2.2nF capacitor and a 180Ω ...
Page 13
... ON of 10). Typical ISL78022 ranges from -5V to -25V. A fault comparator is also R P2 included for monitoring the output voltage. The undervoltage 20kΩ threshold is set at 200mV above the 0.2V reference level. Set-up Output Voltage Refer to “ ...
Page 14
... Fairchild MMBT3906 PNP transistor is used as the external pass transistor (Q11 in the “Typical Application Circuit” on page 18) then for a maximum V ON 50mA the data sheet indicates Hfe_min = 60. The base-emitter saturation voltage is: Vbe_max = 0.7V. For the ISL78020 and ISL78022, the minimum drive current is shown in Equation 12 2mA ( ...
Page 15
... In the “Typical Application Circuit” on page 18, R DEL C and OFF Where Amps The ISL78020 and ISL78022 have 1 and 5 amplifiers respectively. The op amps are typically used to drive the is from REF to ensure correct start-up operation. DEL capacitor is typically 100nF and has a usable ...
Page 16
... COM divider string. They feature rail-to-rail input and output capability, they are unity gain stable, and have low power consumption (typical 600µA per amplifier). The ISL78020 and ISL78022 have a -3dB bandwidth of 12MHz while maintaining a 10V/µs slew rate. www.datasheet4u.com V ...
Page 17
... Driving Capacitive Loads ISL78020 and ISL78022 can drive a wide range of capacitive loads. As load capacitance increases, however, the –3dB bandwidth of the device will decrease and the peaking will increase. The amplifiers drive 10pF loads in parallel with 10kΩ with just 1.5dB of peaking, and 100pF with 6.4dB of peaking ...
Page 18
... R21 0.1µF CONTROL INPUT 100nF V MAIN V GAMMA FB4 V GAMMA4 V GAMMA SET4 V GAMMA FB2 V GAMMA2 V GAMMA SET2 18 ISL78020, ISL78022 D21 0.1µ 6.8µH 10Ω IN 470nF BOOST 180Ω COMP 2.2nF DRVN NEG POS REG REG FBN REF REF CTL ...
Page 19
... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 19 ISL78020, ISL78022 Q32.7x7 32 LEAD THIN PLASTIC QUAD FLATPACK PACKAGE -D- ...