Datasheet LTC3129 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3μA Quiescent Current |
| 页数 / 页 | 30 / 3 — e lecTrical characTerisTics The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 1.6 Mb |
| 文件语言 | 英语 |
e lecTrical characTerisTics The. denotes the specifications which apply over the specified operating
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LTC3129
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). Unless otherwise noted, VIN = 12V, VOUT = 5V. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Start-Up Voltage l 2.25 2.42 V Input Voltage Range VCC > 2.42V (Back-Driven) l 1.92 15 V VIN UVLO Threshold (Rising) VCC > 2.42V (Back-Driven) l 1.8 1.9 2.0 V VIN UVLO Hysteresis l 80 100 130 mV Output Voltage Adjust Range l 1.4 15.75 V Feedback Voltage l 1.151 1.175 1.199 V Feedback Input Current FB = 1.25V 0.1 10 nA Quiescent Current (VIN) – Shutdown RUN = 0V, Including Switch Leakage 10 100 nA Quiescent Current (VIN) UVLO Either VIN or VCC Below Their UVLO Threshold, or 1.9 3 µA RUN Below the Threshold to Enable Switching Quiescent Current – Burst Mode Operation Measured on VIN, FB > 1.25V 1.3 2.0 µA PWM = 0V, RUN = VIN N-Channel Switch Leakage on VIN and VOUT SW1 = 0V, VIN = 15V 10 50 nA SW2 = 0V, VOUT = 15V RUN = 0V N-Channel Switch On-Resistance VCC = 4V 0.75 Ω Inductor Average Current Limit VOUT > UV Threshold (Note 4) l 220 275 350 mA VOUT < UV Threshold (Note 4) l 80 130 200 mA Inductor Peak Current Limit (Note 4) l 400 500 680 mA Maximum Boost Duty Cycle FB = 1.10V. Percentage of Period SW2 is Low in l 85 89 95 % Boost Mode (Note 7) Minimum Duty Cycle FB = 1.25V. Percentage of Period SW1 is High in l 0 % Buck Mode (Note 7) Switching Frequency PWM = VCC l 1.0 1.2 1.4 MHz SW1 and SW2 Minimum Low Time (Note 3) 90 ns MPPC Voltage l 1.12 1.175 1.22 V MPPC Input Current MPPC = 5V 1 10 nA RUN Threshold to Enable VCC l 0.5 0.9 1.15 V RUN Threshold to Enable Switching (Rising) VCC > 2.4V l 1.16 1.22 1.28 V RUN (Switching) Threshold Hysteresis 50 80 120 mV RUN Input Current RUN = 15V 1 10 nA PWM Input High l 1.6 V PWM Input Low l 0.5 V PWM Input Current PWM = 5V 0.1 1 µA Soft-Start Time 3 ms VCC Voltage VIN > 4.85V l 3.4 4.1 4.7 V VCC Dropout Voltage (VIN – VCC) VIN = 3.0V, Switching 35 60 mV VIN = 2.0V (VCC in UVLO) 0 2 mV VCC UVLO Threshold (Rising) l 2.1 2.25 2.42 V VCC UVLO Hysteresis 60 mV VCC Current Limit VCC = 0V l 4 20 60 mA VCC Back-Drive Voltage (Maximum) l 5.5 V VCC Input Current (Back-Driven) VCC = 5.5V (Switching) 2 4 mA VCC Leakage to VIN if VCC > VIN VCC = 5.5V, VIN = 1.8V, Measured on VIN –27 µA VOUT UV Threshold (Rising) l 0.95 1.15 1.35 V 3129fc For more information www.linear.com/LTC3129 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). Unless otherwise noted, VIN = 12V, VOUT = 5V. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Start-Up Voltage l 2.25 2.42 V Input Voltage Range VCC > 2.42V (Back-Driven) l 1.92 15 V VIN UVLO Threshold (Rising) VCC > 2.42V (Back-Driven) l 1.8 1.9 2.0 V VIN UVLO Hysteresis l 80 100 130 mV Output Voltage Adjust Range l 1.4 15.75 V Feedback Voltage l 1.151 1.175 1.199 V Feedback Input Current FB = 1.25V 0.1 10 nA Quiescent Current (VIN) – Shutdown RUN = 0V, Including Switch Leakage 10 100 nA Quiescent Current (VIN) UVLO Either VIN or VCC Below Their UVLO Threshold, or 1.9 3 µA RUN Below the Threshold to Enable Switching Quiescent Current – Burst Mode Operation Measured on VIN, FB > 1.25V 1.3 2.0 µA PWM = 0V, RUN = VIN N-Channel Switch Leakage on VIN and VOUT SW1 = 0V, VIN = 15V 10 50 nA SW2 = 0V, VOUT = 15V RUN = 0V N-Channel Switch On-Resistance VCC = 4V 0.75 Ω Inductor Average Current Limit VOUT > UV Threshold (Note 4) l 220 275 350 mA VOUT < UV Threshold (Note 4) l 80 130 200 mA Inductor Peak Current Limit (Note 4) l 400 500 680 mA Maximum Boost Duty Cycle FB = 1.10V. Percentage of Period SW2 is Low in l 85 89 95 % Boost Mode (Note 7) Minimum Duty Cycle FB = 1.25V. Percentage of Period SW1 is High in l 0 % Buck Mode (Note 7) Switching Frequency PWM = VCC l 1.0 1.2 1.4 MHz SW1 and SW2 Minimum Low Time (Note 3) 90 ns MPPC Voltage l 1.12 1.175 1.22 V MPPC Input Current MPPC = 5V 1 10 nA RUN Threshold to Enable VCC l 0.5 0.9 1.15 V RUN Threshold to Enable Switching (Rising) VCC > 2.4V l 1.16 1.22 1.28 V RUN (Switching) Threshold Hysteresis 50 80 120 mV RUN Input Current RUN = 15V 1 10 nA PWM Input High l 1.6 V PWM Input Low l 0.5 V PWM Input Current PWM = 5V 0.1 1 µA Soft-Start Time 3 ms VCC Voltage VIN > 4.85V l 3.4 4.1 4.7 V VCC Dropout Voltage (VIN – VCC) VIN = 3.0V, Switching 35 60 mV VIN = 2.0V (VCC in UVLO) 0 2 mV VCC UVLO Threshold (Rising) l 2.1 2.25 2.42 V VCC UVLO Hysteresis 60 mV VCC Current Limit VCC = 0V l 4 20 60 mA VCC Back-Drive Voltage (Maximum) l 5.5 V VCC Input Current (Back-Driven) VCC = 5.5V (Switching) 2 4 mA VCC Leakage to VIN if VCC > VIN VCC = 5.5V, VIN = 1.8V, Measured on VIN –27 µA VOUT UV Threshold (Rising) l 0.95 1.15 1.35 V 3129fc For more information www.linear.com/LTC3129 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts