HX8001 同步升降压方案

HX8001 Synchronous Boost,Buck DC/DC Regulator HX8001 Features
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Description
The HX8001 is high efficiency, fixed frequency, Buck-Boost DC/DC converters which operates from input voltages above, below or equal to the output voltage. The devices are suitable for single lithium-ion, multicell alkaline or NiMH applications where the output voltage is within the battery voltage range. The switching frequencies up to 1.5 MHz could be fixed by employing an external resistor, and the oscillator could be synchronized to an external clock. the quiescent current is 1mA, and this feature maximizing the battery life in portable applications. Other features include a 1 µA shutdown, soft-start control, thermal shutdown and current limit. The SY3181 converters are available in the 10-pin thermally enhanced MSOP packages (or upon request).
Synchronous rectification: Up to 95% efficiency Single inductor Fixed frequency operation with battery voltages above, below or equal to the output
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Quiescent current 1mA (50uA low power mode: mode pin high) Up to 600mA continuous output current 1.8V to 5.5V input and output voltage range Programmable oscillator frequency from 350kHz to 1.5MHz No Shottky Diodes required VOUT disconnected from VIN during shutdown Shutdown current: IQ 1µA Package: small thermally enhanced 10-pin MSOP
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Application
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Digital cameras and Wireless handsets Palmtop computers MP3/MP4 players Handheld instruments
Typical Applications
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HX8001 Absolute Maximum Ratings
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～ +6V VRT,FB,SHDN/SS, SYNC ………………………………………….………………- 0.3 V ～+ 6 V V ………………………………………….……………………..……….….…..……- 0.3 V ～ + 6 V V ……………………………………...……………………………….….…..….....- 0.3 V ～ + 6 V Operating Temperature Range ………………...………….…………....….…...- 40℃ ～ + 85℃ Lead Temperature (Soldering 10 sec.) ….………………...………...….….……………..+ 300℃ Storage Temperature Range …………………...……………………….….….- 65℃ ～ + 150℃
VIN ……………………………………………………………………….………….…..- 0.3 V
SW OUT
Pin Assignment
PIN NUMBER MSOP-10 1
1 2 3 4 5 10 9 8 7 6
PIN NAME R0 MS S1 S2 GND VOUT VIN EN VFB COMP
FUNCTION
2 3 4 5 6 7 8 9 10
MODE/SYNC Switch 1 Switch 2 Ground Output Input ON/OFF Control (High Enable) Feedback
MSOP-10
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HX8001 Electrical Characteristics
Operating Conditions: TA=25 PARAMETER Input Start-Up Voltage Input Operating Range Output Voltage Adjust Range Feedback Voltage Feedback Input Current Quiescent Current, Shutdown Quiescent Current, Active NMOS Switch Leakage PMOS Switch Leakage NMOS Switch On Resistance PMOS Switch On Resistance Input Current Limit Maximum Duty Cycle Minimum Duty Cycle Frequency Accuracy SYNC Input High SYNC Input Low SYNC Input Current Error Amp AVOL Error Amp Source Current Error Amp Sink Current EN Input High EN Input Low EN Threshold EN Input Current
℃, V
IN=
VOUT =3.6V unless otherwise specified. CONDITIONS
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MIN 1.8 2.5 1.200
TYP 1.8
MAX 1.9 5.5 5.5
UNITS V V V V nA
VFB=1.212V EN=0V, Not Including Switch Leakage VC=0V
1.212 1 0.1 1 0.1 0.19 0.22
1.220 50 1
µA
mA
， SYNC=0V
Switches B and C Switches A and D Switches B and C Switches A and D Boost (% Switch C On) Buck (% Switch A On)
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5 10
µA µA Ω Ω
A % % % MHz V
1 55 100 0.8 2
75 0 12 0.4 1
1
VSYNC=5.5V
0.01 90 1.5 380 1.8
µA dB µA
A
When IC is Enabled When EA is at Maximum Boost Duty Cycle VEN=5.5V
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0.4 2.2 0.01 1
V V
µA
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