Datasheet LTC3700 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | Constant Frequency Step-Down DC/DC Controller with LDO Regulator |
| 页数 / 页 | 16 / 3 — ELECTRICAL CHARACTERISTICS The. denotes specifications that apply over … |
| 文件格式/大小 | PDF / 221 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS The. denotes specifications that apply over the full operating temperature
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LTC3700
ELECTRICAL CHARACTERISTICS The
●
denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = VIN2 = 4.2V unless otherwise specified. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS LDO Regulator
VIN2 Input Voltage 2.4 6 V Input DC Supply Current Typicals at VIN2 = 4.2V Normal Operation with Buck Enabled 2.4V ≤ VIN2 ≤ 6V 50 100 µA Normal Operation with Buck Undervoltage 2.4V ≤ VIN2 ≤ 6V 100 150 µA Shutdown with Buck Enabled 2.4V ≤ VIN2 ≤ 6V, VITH/RUN = 0V 0 1 µA Shutdown with Buck Undervoltage 2.4V ≤ VIN2 ≤ 6V, VITH/RUN = 0V 8 24 µA Regulated Feedback Voltage 0°C ≤ TA ≤ 70°C, ILDO = 1mA ● 0.780 0.800 0.830 V –40°C ≤ TA ≤ 85°C, ILDO = 1mA ● 0.765 0.800 0.835 V Output Voltage Line Regulation (Unity-Gain Feedback) With Buck Enabled 2.65V ≤ VIN ≤ 9.8V 0.05 mV/V With Buck Enabled 2.4V ≤ VIN2 ≤ 6V, ILDO = 1mA 4 mV/V With Buck Undervoltage 2.4V ≤ VIN2 ≤ 6V, ILDO = 1mA 4 mV/V Output Voltage Load Regulation 1mA ≤ ILOAD ≤ 150mA 0.06 0.12 mV/mA VFB2 Input Current 0 10 nA LDO Short-Circuit Current VLDO = 0V 150 200 mA LDO Dropout VIN2 = 3.3V, ILDO = 150mA 270 mV VIN2 = 6V, ILDO = 150mA 170 mV Overtemperature Trip Point (Note 7) 150 °C Overtemperature Hysteresis (Note 7) 5 °C
PGOOD
Feedback Voltage PGOOD Threshold (Note 8) PGOOD High-to-Low VFB or VFB2 Falling – 12 – 7.5 % VFB or VFB2 Rising 7.5 12 % PGOOD Low-to-High VFB or VFB2 Rising – 10 – 5.0 % VFB or VFB2 Falling 5.0 10 % PGOOD On-Resistance VITH/RUN = 0V, VIN = VIN2 = 4.2V, VPGOOD = 100mV 135 180 Ω
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 4:
Dynamic supply current is higher due to the gate charge being of a device may be impaired. delivered at the switching frequency.
Note 2:
The LTC3700 is guaranteed to meet specifications from␣ 0°C␣ to
Note 5:
The LTC3700 is tested in a feedback loop that servos VFB to the 70°C. Specifications over the –40°C to 85°C operating temperature range output of the error amplifier. are assured by design, characterization and correlation with statistical
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to process controls. a percentage of value as given in Figure 2.
Note 3:
TJ is calculated from the ambient temperature TA and power
Note 7:
Guaranteed by design; not tested in production. dissipation PD according to the following formula:
Note 8:
PGOOD values are expressed as a percentage difference from the TJ = TA + (PD • θJA°C/W) respective “Regulated Feedback Voltage” as given in the table. 3700f 3
ELECTRICAL CHARACTERISTICS The
●
denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = VIN2 = 4.2V unless otherwise specified. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS LDO Regulator
VIN2 Input Voltage 2.4 6 V Input DC Supply Current Typicals at VIN2 = 4.2V Normal Operation with Buck Enabled 2.4V ≤ VIN2 ≤ 6V 50 100 µA Normal Operation with Buck Undervoltage 2.4V ≤ VIN2 ≤ 6V 100 150 µA Shutdown with Buck Enabled 2.4V ≤ VIN2 ≤ 6V, VITH/RUN = 0V 0 1 µA Shutdown with Buck Undervoltage 2.4V ≤ VIN2 ≤ 6V, VITH/RUN = 0V 8 24 µA Regulated Feedback Voltage 0°C ≤ TA ≤ 70°C, ILDO = 1mA ● 0.780 0.800 0.830 V –40°C ≤ TA ≤ 85°C, ILDO = 1mA ● 0.765 0.800 0.835 V Output Voltage Line Regulation (Unity-Gain Feedback) With Buck Enabled 2.65V ≤ VIN ≤ 9.8V 0.05 mV/V With Buck Enabled 2.4V ≤ VIN2 ≤ 6V, ILDO = 1mA 4 mV/V With Buck Undervoltage 2.4V ≤ VIN2 ≤ 6V, ILDO = 1mA 4 mV/V Output Voltage Load Regulation 1mA ≤ ILOAD ≤ 150mA 0.06 0.12 mV/mA VFB2 Input Current 0 10 nA LDO Short-Circuit Current VLDO = 0V 150 200 mA LDO Dropout VIN2 = 3.3V, ILDO = 150mA 270 mV VIN2 = 6V, ILDO = 150mA 170 mV Overtemperature Trip Point (Note 7) 150 °C Overtemperature Hysteresis (Note 7) 5 °C
PGOOD
Feedback Voltage PGOOD Threshold (Note 8) PGOOD High-to-Low VFB or VFB2 Falling – 12 – 7.5 % VFB or VFB2 Rising 7.5 12 % PGOOD Low-to-High VFB or VFB2 Rising – 10 – 5.0 % VFB or VFB2 Falling 5.0 10 % PGOOD On-Resistance VITH/RUN = 0V, VIN = VIN2 = 4.2V, VPGOOD = 100mV 135 180 Ω
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 4:
Dynamic supply current is higher due to the gate charge being of a device may be impaired. delivered at the switching frequency.
Note 2:
The LTC3700 is guaranteed to meet specifications from␣ 0°C␣ to
Note 5:
The LTC3700 is tested in a feedback loop that servos VFB to the 70°C. Specifications over the –40°C to 85°C operating temperature range output of the error amplifier. are assured by design, characterization and correlation with statistical
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to process controls. a percentage of value as given in Figure 2.
Note 3:
TJ is calculated from the ambient temperature TA and power
Note 7:
Guaranteed by design; not tested in production. dissipation PD according to the following formula:
Note 8:
PGOOD values are expressed as a percentage difference from the TJ = TA + (PD • θJA°C/W) respective “Regulated Feedback Voltage” as given in the table. 3700f 3