ICL7662 Intersil Corporation, ICL7662 Datasheet
ICL7662
Available stocks
Related parts for ICL7662
ICL7662 Summary of contents
Page 1
... Only 2 noncritical external capacitors are needed for the charge pump and charge reservoir functions. The ICL7662 can also function as a voltage doubler, and will generate output voltages up to +38.6V with a +20V input. ...
Page 2
... ICL7662CBD SOIC (N) ICL7662CBD SOIC (N) ICL7662ITV - Pin Metal Can T8.C ICL7662IPA - PDIP ICL7662IBD - SOIC (N) ICL7662MTV -55 to 125 8 Pin Metal Can T8.C (Note 1) NOTE: 1. Add /883 to part number if /883B processing is required. Functional Block Diagram RC OSCILLATOR ...
Page 3
... Pin Test pin and is not connected in normal use. When the TEST pin is connected to V+, an internal transmission gate disconnects any external parasitic capacitance from the oscillator which would otherwise reduce the oscillator frequency from its nominal value. 3-47 ICL7662 Thermal Information Thermal Resistance (Typical, Note 3) PDIP Package ...
Page 4
... LV = GND OPEN SUPPLY VOLTAGE (V) FIGURE 5. OSClLLATOR FREQUENCY vs SUPPLY VOLTAGE NOTE: All typical values have been characterized but are not tested. 3-48 ICL7662 (See Figure 14, Test Circuit 20mA 0pF OSC LV = OPEN FIGURE 2. OUTPUT SOURCE RESISTANCE AS A ...
Page 5
... PBFF LOAD CURRENT I (mA) L FIGURE 11. SUPPLY CURRENT AND POWER CONVERSION EFFICIENCY AS A FUNCTION OF LOAD CURRENT 3-49 ICL7662 (See Figure 14, Test Circuit) (Continued 15V - 0pF OSC - -10 -11 -12 -13 -14 -15 70 125 ...
Page 6
... Typical Performance Curves NOTE: 5. These curves include in the supply current that current fed directly into the load R supply current goes directly to the positive side of the load, and the other half, through the ICL7662, to the negative side of the load. Ideally ...
Page 7
... Do not exceed maximum supply voltages not connect LV terminal to GROUND for supply voltag- es greater than 10V. 3. When using polarized capacitors, the + terminal of C must be connected to pin 2 of the ICL7662 and the + ter- minal of C must be connected to GROUND the voltage supply driving the 7662 has a large source impedance ( then a 2 ...
Page 8
... R OUT Cascading Devices The ICL7662 may be cascaded as shown in Figure 19 to produce larger negative multiplication of the initial supply voltage. However, due to the finite efficiency of each device, the practical limit is 10 devices for light loads. The output at 2 voltage is defined by: (current fl ...
Page 9
... FIGURE 20. EXTERNAL CLOCKING It is also possible to increase the conversion efficiency of the ICL7662 at low load levels by lowering the oscillator frequency. This reduces the switching losses, and is achieved by connecting an additional capacitor, COSC, as shown in Figure 21. However, lowering the oscillator frequency will cause an undesirable increase in the impedance of the pump (C reservoir (C ) capacitors ...
Page 10
... Regulated Negative Voltage Supply In some cases, the output impedance of the ICL7662 can be a problem, particularly if the load current varies substantially. The circuit of Figure 25 can be used to overcome this by controlling All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certifi ...