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1、The XA2320B is available in the 6-pin SOT23-6. XA2320B have thermal shutdown capability XA2320B ideally suited for small, The XA2320B is a low noise, constant XA2320BXA2320B 1 F Fe ea at tu ur re es s ? Fixed 3.3V 4% Output ? VIN Range: 1.8V to 5V ? Output Current: Up to 150mA ? Constant Frequency O
2、peration at All Loads ? Low Noise Constant Frequency (1.2MHz) Operation ? Automatic Soft-Start Reduces Inrush Current ? Shutdown Current 1A ? Short-Circuit Protection ? No Inductors ? Available in Low Profile 6-Lead SOT23 Package A Ap pp pl li ic ca at ti io on n ? 2 AA Cell to 3.3V ? USB On-The-Go
3、Devices ? White LED Drivers ? Handheld Devices D De es sc cr ri ip pt ti io on n frequency (1.2MHz) switched capacitor voltage doubler. It produce a regulated output voltage from a 1.8V to 5V input with up to 150mA of output current. Low external parts count (one flying capacitor and two small bypas
4、s capacitors at VIN and VOUT) make the battery-powered applications. A new charge-pump architecture maintains constant switching frequency to zero load and reduces both output and input ripple. The and can survive a continuous short circuit from VOUT to GND. Built-in soft-start circuitry prevents ex
5、cessive 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. L Lo ow w N No oi is se e, , R Re eg gu ul la at te ed d C Ch ha ar rg ge e P Pu ummp p D D
6、C C/ /D DC C C Co on nv ve er rt te er r 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 3.3V Output Figure 2: USB Port to Regulated 3.3V Power Supply Figure 3: Lithium-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
7、 SOT-23-6 PIN NAME 1 VOUT 2 GND 3 EN 4 C- 5 VIN 6 C+ XA2320BXA2320B The XA2320B are guaranteed to meet performance spec 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) ? VIN .- 0.3V to 6V ? VOUT.- 0.3V to 3.5V ? VOUT Short-circuit Duration.indefinite ? VEN.- 0.3V to 6V ?
8、 IOUT (Note 2) . 150mA ? 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 those values beyond which the life of a device may be impaired. Note 2: Based on long term current density
9、limitations. Note 3: ifications from 0C to 70C. Specifications over the 40C to 85C operating temperature range are assured by design, characterization 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 ar
10、e at TA = 25 . VIN = 3.6V，EN= VIN, CIN=COUT=2.2uF or 1uF unless otherwise noted. PARAMETER C COON ND DI IT TI IOON NS S MIN TYP MAX UNITS Input Voltage Range (VIN) 1.8 5.5 V Output Voltage Range (VOUT) 2.7V VIN 5.5V, IOUT 65mA 3.3 V ISHDN Shutdown Current EN=0V,VOUT = 0V 0.3 0.5 0.9 A No load input
11、current IOUT = 0mA, VIN = 2.7V 1.77 mA Output current limit 150 mA Output Ripple (VR) IOUT = 100mA 20 mVP-P Switching Frequency ( fosc) 1.2 MHz XA2320BXA2320B 4 T Ty yp pi ic ca al l P Pe er rf fo 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 (IOU
12、T=0A) 3.2 3.21 3.22 3.23 3.24 3.25 3.26 3.27 3.28 3.29 3.3 2.533.544.55 Supply Voltage (V) Output Voltage (V) No Laod Supply Current vs. Supply Voltage 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 2.533.544.55 Supply Voltage (V) Supply Current(mA) Oscillator Frequency vs.Supply Voltage (IOUT=0A) 0.5 0.6
13、0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 2.533.544.55 Supply Voltage (V) Oscillator Frequency (MHz) Short Circuit Current vs. Supply Voltage 0 30 60 90 120 150 180 210 240 270 300 2.533.544.55 Supply Voltage (V) Short Circuit Current (mA) XA2320BXA2320B 5 VIN=2.7V ILOAD=0A VIN=2.7V ILOAD=220mA VIN=3.6V ILO
14、AD=0A XA2320BXA2320B 6 VIN=3.6V ILOAD=180mA VIN=4.2V ILOAD=0mA VIN=4.2V ILOAD=140mA XA2320BXA2320B 7 VIN=5V ILOAD=0mA VIN=5V ILOAD=120mA XA2320BXA2320B The XA2320B have built-in soft-start circuitry to prev The XA2320B have built-in short-circuit current limiti voltage of approximately 0.8V. The XA2
15、320B is in shut XA2320B draw only leakage current from the VIN The XA2320B use a switched capacitor charge pump to boost 8 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 and optimum thermal perform
