5. Charge Pump ICs __________________________________________________________________________________ XC9801 Series Step-Up Charge Pump General Description Features The XC9801 series are step-up charge pump ICs which provide stable, highly efficient, positive voltages with the only external components required being 2 capacitors. Output voltage is selectable in 0.1V steps within a 2.5V ~ 5.2V range and with output stabilised through the control of the charge pump's output impedance, ripple is minimal. Control switches to PFM (pulse skip) during light loads without affecting output impedance or ripple so that the IC is protected against drops in efficiency. As well as the ultra small MSOP-8 package, the small consumption current and high efficiencies of the series make the XC9801 suitable for use with all types of battery operated applications. Pin Configuration SENSE VOUT CE C1+ VIN C1- GND PGND Block Diagram C1+ P1 VIN C1- P2 VOUT N5 P3 N4 SENSE Chip Enable Oscillator Controler Vref PGND GND Ordering Information XC9801/02①②③④⑤⑥ DESIGNATOR ① ② ③ ④ ⑤ ⑥ 52 Input Voltage Range: 1.8V ~ 5.5V Output Voltage Range: 2.5V ~ 5.2V Small Input Current: 80µA (no load) Output Current: 80mA (3.6V → 5V step-up) Oscillation Frequency: 300kHz Stand-By Current (CE 'L'): 2.0µA (max) Can be used as a Step-Up Doubler (sense = 0V) MSOP-8A Package Pin Assignment MSOP-8A (TOP VIEW) CE DETAILS B 25~52 3 K R L DESCRIPTION True Logic Level at CE Pin : Positive Output Voltage (2.5V ~ 5.2V) 5.0V → ②=5, ③=0 Oscillator Frequency : 300kHz Package : MSOP-8A (1reel = 1000pcs) Embossed tape. Standard Feed Embossed tape. Reverse Feed PIN NUMBER PIN NAME 1 2 SENSE CE Output Voltage Monitor 3 VIN Input (power supply) FUNCTION Chip Enable 4 GND Ground 5 PGND Power Ground 6 C1 - External Capacitor - 7 C1 + External Capacitor + 8 VOUT Output