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ILC6382CIR-50 数据表(PDF) 8 Page - Impala Linear Corporation |
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ILC6382CIR-50 数据表(HTML) 8 Page - Impala Linear Corporation |
8 / 19 page 1-Cell to 3-Cell Boost with True Load Disconnect, 3.3V, 5V, or Adjustable Output Impala Linear Corporation 8 (408) 574-3939 www.impalalinear.com Oct 1999 ILC6382 1.5 The following equation is used when VIN is lower than 1.25V: R1 = R2 x [(VREF - VIN) / (VOUT - VREF)], where VREF = 1.25V (nom.) This equation can also be derived using voltage divider for- mula across R2. A typical value for R2 is 100k Ω. Note that the low battery detector does not operate when the ILC6382 is in PFM mode or in shutdown. Shut Down The LBI pin is shared with the shutdown pin. A low voltage (<0.4V) will put the ILC6382 into a power down state. The simplest way to implement this is with an FET across R6 as shown in figure 8. Note that when the device is not in PWM mode or is in shutdown the low battery detector does not operate. When the ILC6382 is shut down, the synchronous rectifier disconnects the output from the input. This ensures that there is only leakage (IIN < 1µA typical) from the input to the output so that the battery is not drained when the ILC6382 is shut down. Power Good Output (POK) The POK output of the ILC6382 indicates when VOUT is within the regulation tolerance of the set output voltage. POK output is an open drain device output capable of sink- ing 2mA. It will remain pulled low until the output voltage has risen to typically 95% of the specified VOUT. Note that a pull-up resistor must be connected from the POK output (pin 5 of ILC6382CIR-XX) to either ILC6382's output or to some other system voltage source. Adjustable Output Voltage Selection The ILC6382-ADJ allows the output voltage to be set using a potential divider. The formula for setting the adjustable output voltage is; VOUT = VFB x (1+R1/R2) Where VFB is the threshold set which is 1.25V nominal. Negative Voltage Output It is possible to generate a negative output voltage as a sec- ondary supply using the ILC6382. This negative voltage may be useful in some applications where a negative bias voltage at low current is required. V OUT 8 R2 3 LBI/SD V IN R1 ILC6382 + - 1.25V Internal Reference GND 7 ON/OFF R5 R6 LBI/SD 3 ILC6382 2 VIN 7 GND 10 µF ON OFF V IN 1 to 3-cell R5 R6 15 µH Ext Sync (Connect to GND if unused) L 10µF C OUT R1 R2 ILC6382-ADJ MSOP-8 L X V IN LBI/SD SYNC GND LBO V FB V OUT V OUT V OUT = 1.25 (1+R1/R2) 1 2 3 4 8 7 6 5 C IN + 1 2 L L X V IN V IN ILC6382 0.01µF 0.01µF -V 1A Schottky Diodes Figure 7: VLBI < 1.25V Figure 8: Shut Down Control Figure 9: Adjustable Voltage Configuration Figure 10: Negative Output Votlage |
类似零件编号 - ILC6382CIR-50 |
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类似说明 - ILC6382CIR-50 |
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