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EL7556DCMZ-T13 Datasheet(PDF) 8 Page - Intersil Corporation |
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EL7556DCMZ-T13 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 11 page 8 Pin Descriptions I = Input, O = Output, S = Supply PIN NUMBER PIN NAME PIN TYPE FUNCTION 1 FB1 I Voltage feedback pin for the buck regulator. Active when VCC2DET is logic low. Normally connected to external resistor divider between VOUT and GND. A 2µA pull-up current forces VOUT to VSS in the event that FB1 is floating and VCC2DET is inadvertently connected to GND. 2 CREF I Bandgap reference bypass capacitor. Typically 0.1µF to VSS. 3 CSLOPE I Slope compensation capacitor. Ramp width corresponds to LX duty cycle. CSLOPE to COSC ratio is normally 1:1.5. 4 COSC I Oscillator timing capacitor. FOSC(Hz) can be approximated by: FOSC(Hz) = 0.0001/COSC. COSC in Farads. 5 VDD S Power Supply for PWM control circuitry. Normally the same potential as VIN. 6 VIN S Power supply for the buck regulator. Connected to the drain of the high-side NMOS FET. 7 VSSP S Ground return for the buck regulator. Connected to the source of the low-side synchronous NMOS FET. 8 VIN S Same as pin 6. 9 VSSP S Same as pin 7. 10 VSSP S Same as pin 7. 11 VSSP S Same as pin 7. 12 VSSP S Same as pin 7. 13 VCC2DET I VCC2DET interface logic input. When driven to logic 1 VOUT = 3.500V. When driven to logic 0 the PWM uses FB1 to determine VOUT: VOUT = 1.0V*(1+R3/R4). 14 OUTEN I The switching regulator output is enabled when logic 1. The reference voltage output operates whenever the power supply is qualified (VDD>VPOR) regardless of the state of this pin. 15 OT O Over temperature indicator. Normally high. Pulls low when die temperature exceeds 135°C, returns to the high state when die temperature has cooled to 100°C. 16 PWRGD O Power good window comparator output. Logic 1 when regulator output is within ±10% of programmed voltage. 17 TEST I Test pin. Must be connected to VSSP in normal operation. 18 VSSP S Same as pin 7. 19 VSSP S Same as pin 7. 20 LX O Inductor drive pin. High current switching output whose average voltage equals the regulator output voltage. 21 LX O Same as pin 20. 22 LX O Same as pin 20. 23 LX O Same as pin 20. 24 VHI I Gate drive to high-side driver. Bootstrapped from LX with a 0.1µF capacitor. 25 VSS S Ground return for the control circuitry. 26 C2V I Connected to voltage doubler output. Supplies gate drive to the low-side driver. 27 CP O Drives the negative side of charge pump capacitor at one-half the oscillator frequency FOSC. 28 FB2 I Voltage feedback pin. Active when VCC2DET is logic 1. Internally preset to VOUT = 3.5V. EL7556D |
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