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CE7660 Dataheets PDF



Part Number CE7660
Manufacturers Nanjing Chipower Electronics
Logo Nanjing Chipower Electronics
Description Charge Pump DC-DC Voltage Converter
Datasheet CE7660 DatasheetCE7660 Datasheet (PDF)

Charge Pump DC-DC Voltage Converter CE7660 Charge Pump DC-DC Voltage Converter CE7660 CE7660 is a charge pump dc-to-dc voltage converter using Si-gate CMOS technology and optimization design. It converters a +2.5V to +10V input to a corresponding -2.5V to -10V output using only two external capacitors, eliminating inductors and their associated cost, size and EMI. The on-board oscillator operates at a nominal frequency of 10KHz. Operation below 10 KHz (for lower supply current applications) .

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Charge Pump DC-DC Voltage Converter CE7660 Charge Pump DC-DC Voltage Converter CE7660 CE7660 is a charge pump dc-to-dc voltage converter using Si-gate CMOS technology and optimization design. It converters a +2.5V to +10V input to a corresponding -2.5V to -10V output using only two external capacitors, eliminating inductors and their associated cost, size and EMI. The on-board oscillator operates at a nominal frequency of 10KHz. Operation below 10 KHz (for lower supply current applications) is possible by connecting an external capacitor from OSC to ground. Features • Wide input voltage range: 2.5V~10V • Efficient voltage conversion:99.9% • Good power efficiency: 98% • Low power supply: 50uA @5V input • Easy to use: only two external capacitors required • Compatible with RS232 negative power supply standard • High ESD protection: up to 4KV • No Dx diode needed for high voltage operation • Package : SOP8, DIP8 Applications • LCD Display Module • Specially designed for LCD module • Instrument product • RS-232 Power supply • Operation amplifier supply • On board negative supply for dynamic RAMS Pin Configuration NC CAP+ GND CAP- 1 2 3 4 8 VDD 7 OSC 6 LV 5 Vout CE7660 DIP8 / SOP8 Pin Description PIN Number 1 2 3 4 5 6 7 8 PIN NAME NC CAP+ GND CAP- Vout LV OSC VDD FUNCTION No connection Connecting external capacitor(+) pin Ground pin Connecting external capacitor(-) pin Voltage output pin Low voltage selection pin Connecting oscillation capacitor pin Power supply pin Nanjing Chipower Electronics Inc. 1(8) Charge Pump DC-DC Voltage Converter Block Diagram CE7660 Absolute Maximum Ratings PARAMETER Input voltage LV PIN input voltage OSC PIN input voltage Output Short Duration (Vsupply ≤5.5V) ContinuousTotal Power Dissipation (TA≤75℃) SOP8 DIP8 Operating Ambient Temperature Storage Temperature Soldering temperature and time SYMBOL VIN VLX VOSC Pd Pd TOpr Tstg Tsolder RATINGS +13V -0.3~(V++0.3)(if V+<5.5V) (V+-5.5V)~(V++0.3V)(if V+>5.5V) ∞ 470 730 -40~+85 -65~+150 260℃, 10s UNITS V V mW mW ℃ ℃ Electrical Characteristics(VDD=5V,COSC=0) Symbol Item Conditions Min Typ Max Unit I+ Supply Current RL=∞ — 50 100 µA VDD Supply Voltage 2.5 — 10 V ROUT Output Resistance IOUT=20mA TA=25℃ 60 Ω FOSC PEFF Oscillator Frequency Power Efficiency Pin 7 open RL=5kΩ — 95 10 98 — kHz —% VOUTEFF Voltage Conversion Efficiency RL=∞ 98 99.9 — % Nanjing Chipower Electronics Inc. 2(8) Charge Pump DC-DC Voltage Converter Test Circuits CE7660 Type Characteristics 1.Vout VS Iout: Vout VS Iout (Vin=5V) -6 -5 -4 Vout(V) -3 Vout -2 -1 0 0 1 2 3 4 5 6 7 8 9 10 15 20 30 40 50 Iout(mA) 2.η VS Iout: Efficiency VS Io(utVin=5V) 120 100 80 (%) Efficiency60 40 Efficiency 20 0 1 2 3 4 5 6 7 8 9 10 15 20 30 40 50 Iout(mA) Nanjing Chipower Electronics Inc. 3(8) Charge Pump DC-DC Voltage Converter CE7660 Operation CE7660 together with two external capacitors C1、C2 complement a voltage Inverter. Capacitor C1 is charged to a voltage V+, for the first half cycle when switches S1 and S3 are closed ( while switches S2 and S4 are open during this half cycle); During the second half cycle of operation, switches S2 and S4 are closed, with S1 and S3 open, thereby shifting capacitor C2 negatively to -V+. Theoretical Power Efficiency Considerations In theory, a capacitive charge pump can approach 100% efficiency if certain conditions are met: 1、 The drive circuitry consumes no power. 2、 The output switches have extremely low ON resistance and no offset when operation. 3、 The impedances of the pump and reservoir capacitors are negligible at the pump frequency. Notes: 1、Supply voltage should not exceed maximum rating; 2、Do not short the output to VDD supply for voltages above 5.5V for extended periods; 3、Polarized capacitors should be connected as the figure above. Nanjing Chipower Electronics Inc. 4(8) Charge Pump DC-DC Voltage Converter Typical Application CE7660 Above figure is the basic application circuit to provide a negative supply from -2.5V~ -10V while a positive supply from +2.5V ~ +10V is available. When VDD=+5V, the output resistance is about 60Ω; The output voltage is –4.5V while the load current is 10mA. CE7660 may be paralleled to reduce output resistance (see the above figure) Rout(Paralleled)=Rout/N CE7660 may be cascaded as shown above to produce larger negative output voltage (-10V). However, The output resistance is approximately double that of a single chip resistance. CE7660 may be cascaded as shown above to produce larger negative output voltage (-15V). However, The output resistance is approximately double that of a single chip resistance. Nanjing Chipower Electronics Inc. 5(8) Charge Pump DC-DC Voltage Converter CE7660 VDD + 10uF 1 NC 2 CAP+ 3 GND 4 CAP- VDD 8 OSC 7 LV 6 Vout 5 Cosc Vout CE7660 10uF + To increase the conversion efficiency, the oscillator frequency may be lowered by connecting a capacitor from pin 7 and pin 8 as shown above. CE7660 m.


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