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1、 HX1001 1 F Fe ea at tu ur re es s ? Fixed 5V 4% Output ? VIN Range: 2.7V to 5V ? Output Current: Up to 250mA ? Constant Frequency Operation at All Loads ? Low Noise Constant Frequency (1.2MHz) Operation ? Automatic Soft-Start Reduces Inrush Current ? Shutdown Current 1A ? Short-Circuit Protection ?
2、 No Inductors ? Available in Low Profile 6-Lead SOT23 Package A Ap pp pl li ic ca at ti io on n ? White LED Backlighting ? Li-Ion Battery Backup Supplies ? Local 3V to 5V Conversion ? Smart Card Readers ? PCMCIA Local 5V Supplies D De es sc cr ri ip pt ti io on n The HX4002 is a low noise, constant
3、frequency (1.2MHz) switched capacitor voltage doubler. It produce a regulated output voltage from a 2.7V to 4.5V input with up to 250mA of output current. Low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make the HX4002 ideally suited for small, battery
4、-powered applications. A new charge-pump architecture maintains constant switching frequency to zero load and reduces both output and input ripple. The HX4002 have thermal shutdown capability and can survive a continuous short circuit from VOUT to GND. Built-in soft-start circuitry prevents excessiv
5、e inrush current during start-up. High switching frequency enables the use of small ceramic capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to 1uA. The HX4002 is available in the 6-pin SOT23-6. HX4002 L Lo ow w N No oi is se e, , R Re eg gu ul l
6、a at te ed d C Ch ha ar rg ge e P Pu ummp p D DC C/ /D DC C C Co on nv ve er rt te er r tel:13620971652 Q Q : 2 3 5 5 5 5 8 4 6 0 HHX X4 40 00 02 2 2 T Ty yp pi ic ca al l A Ap pp pl li ic ca at ti io on ns s Figure 1: Regulated 5V Output Figure 2: USB Port to Regulated 5V Power Supply Figure 3: Lit
7、hium-Ion Battery to 5V White or Blue LED Drivers P Pi in n D De es sc cr ri ip pt ti io on n PIN NUMBER SOT-23-6 PIN NAME 1 VOUT 2 GND 3 EN 4 C- 5 VIN 6 C+ tel:13620971652 Q Q : 2 3 5 5 5 5 8 4 6 06973608 HHX X4 40 00 02 2 3 A Ab bs so ol lu ut te e MMa ax xi immu umm R Ra at ti in ng gs s (Note 1)
8、? VIN .- 0.3V to 6V ? VOUT.- 0.3V to 5.5V ? VOUT Short-circuit Duration.indefinite ? VEN.- 0.3V to 6V ? IOUT (Note 2) . 300mA ? Operating Temperature Range (Note 3).- 30 to 85 ? Lead Temperature (Soldering 10 sec.) 300 ? Storage Temperature Range - 65 to 125 Note 1: Absolute Maximum Ratings are thos
9、e values beyond which the life of a device may be impaired. Note 2: Based on long term current density limitations. Note 3: The HX4002 are guaranteed to meet performance specifications from 0C to 70C. Specifications over the 40C to 85C operating temperature range are assured by design, characterizat
10、ion and correlation with statistical process controls. E El le ec ct tr ri ic ca al l C Ch ha ar ra ac ct te er ri is st ti ic cs s The specifications are at TA = 25 . VIN = 3.6V，EN= VIN, CIN=COUT=2.2uF or 1uF unless otherwise noted. EFFI = (Output Voltage Output Current) / (Input Voltage Input Curr
11、ent) 100% PARAMETER C COON ND DI IT TI IOON NS S MIN TYP MAX UNITS Input Voltage Range (VIN) 2.7 5.5 V Output Voltage Range (VOUT) 2.7V VIN 5.5V, IOUT 65mA 4.7 5 5.2 V ISHDN Shutdown Current EN=0V,VOUT = 0V 0.3 0.5 0.9 A No load input current IOUT = 0mA, VIN = 2.7V 1.77 mA Output current limit 250 m
12、A Output Ripple (VR) IOUT = 100mA 20 mVP-P Efficiency VIN = 2.7V, IOUT =80mA 83 % Open-Loop Output Resistance ROL =(2VIN-VOUT)/IOUT VIN = 2.7V, VOUT = 4.5V 6 Switching Frequency ( fosc) 0.6 1.2 1.8 MHz tel:13620971652 Q Q : 2 3 5 5 5 5 8 4 6 0 HHX X4 40 00 02 2 4 T Ty yp pi ic ca al l P Pe er rf fo
13、or rmma an nc ce e C Ch ha ar ra ac ct te er ri is st ti ic cs s Output Voltage vs. Supply Voltage 4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 2.52.93.33.74.14.5 Supply Voltage (V) Output Voltage (V) No Laod Supply Current vs. Supply Voltage 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.52.93.33.74.14.5 S
14、upply Voltage (V) Supply Current(mA) Efficiency vs. Output Current 0 10 20 30 40 50 60 70 80 90 100 050100150200250300 Output Current (mA) Efficiency (%) VIN=2.8V VIN=4.2V VIN=3.6V Oscillator Frequency vs.Supply Voltage 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 2.52.93.33.74.14.5 Supply Voltage (V)
15、Oscillator Frequency (MHz) tel:13620971652 Q Q : 2 3 5 5 5 5 8 4 6 0 5 VOUT Soft-Start Ramp (VIN=3V) P Pi in n F Fu un nc ct ti io on ns s VOUT (Pin 1): Regulated Output Voltage. VOUT should be bypassed with a low ESR ceramic capacitor providing at least 2F of capacitance as close to the pin as possible for best performance. GND (Pin 2): Ground. These pins should be tied to a ground plane for best performance. The exposed pad must be soldered to PCB ground to provide electrical contact
