Datasheet LTC3632 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | High Efficiency, High Voltage 20mA Synchronous Step-Down Converter |
| 页数 / 页 | 22 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Waveforms. Load Step … |
| 文件格式/大小 | PDF / 1.7 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Waveforms. Load Step Transient Response. Short-Circuit Response. PIN FUNCTIONS
该数据表的模型线
文件文字版本
LTC3632
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start Waveforms Load Step Transient Response Short-Circuit Response
OUTPUT OUTPUT VOLTAGE VOLTAGE 2V/DIV OUTPUT 100mV/DIV VOLTAGE 1V/DIV LOAD CURRENT INDUCTOR 20mA/DIV CURRENT 20mA/DIV C 3632 G20 SS = 0.047µF 5ms/DIV 3632 G19 VIN = 10V 1ms/DIV VIN = 10V 200µs/DIV 3632 G21 VOUT = 5V VOUT = 5V
PIN FUNCTIONS SW (Pin 1):
Switch Node Connection to Inductor. This
RUN (Pin 5):
Run Control Input. A voltage on this pin pin connects to the drains of the internal power MOSFET above 1.2V enables normal operation. Forcing this pin switches. below 0.7V shuts down the LTC3632, reducing quiescent
V
current to approximately 3µA.
IN (Pin 2):
Main Supply Pin. A ceramic bypass capacitor should be tied between this pin and GND (Pin 8).
VFB (Pin 6):
Output Voltage Feedback. Connect to an
I
external resistive divider to divide the output voltage down
SET (Pin 3):
Peak Current Set Input. A resistor from this pin to ground sets the peak current trip threshold. Leave for comparison to the 0.8V reference. floating for the maximum peak current (50mA). Short this
HYST (Pin 7):
Run Hysteresis Open-Drain Logic Output. pin to ground for the minimum peak current (10mA). A This pin is pulled to ground when RUN (Pin 5) is below 1µA current is sourced out of this pin. 1.2V. This pin can be used to adjust the RUN pin hysteresis.
SS (Pin 4)
: Soft-Start Control Input. A capacitor to ground See Applications Information. at this pin sets the ramp time to full current output dur-
GND (Pin 8, Exposed Pad Pin 9):
Ground. The exposed ing start-up. A 5.5µA current is sourced out of this pin. If pad must be soldered to the printed circuit board ground left floating, the ramp time defaults to an internal 0.75ms plane for optimal electrical and thermal performance. soft-start. 3632fc 6 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION 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
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start Waveforms Load Step Transient Response Short-Circuit Response
OUTPUT OUTPUT VOLTAGE VOLTAGE 2V/DIV OUTPUT 100mV/DIV VOLTAGE 1V/DIV LOAD CURRENT INDUCTOR 20mA/DIV CURRENT 20mA/DIV C 3632 G20 SS = 0.047µF 5ms/DIV 3632 G19 VIN = 10V 1ms/DIV VIN = 10V 200µs/DIV 3632 G21 VOUT = 5V VOUT = 5V
PIN FUNCTIONS SW (Pin 1):
Switch Node Connection to Inductor. This
RUN (Pin 5):
Run Control Input. A voltage on this pin pin connects to the drains of the internal power MOSFET above 1.2V enables normal operation. Forcing this pin switches. below 0.7V shuts down the LTC3632, reducing quiescent
V
current to approximately 3µA.
IN (Pin 2):
Main Supply Pin. A ceramic bypass capacitor should be tied between this pin and GND (Pin 8).
VFB (Pin 6):
Output Voltage Feedback. Connect to an
I
external resistive divider to divide the output voltage down
SET (Pin 3):
Peak Current Set Input. A resistor from this pin to ground sets the peak current trip threshold. Leave for comparison to the 0.8V reference. floating for the maximum peak current (50mA). Short this
HYST (Pin 7):
Run Hysteresis Open-Drain Logic Output. pin to ground for the minimum peak current (10mA). A This pin is pulled to ground when RUN (Pin 5) is below 1µA current is sourced out of this pin. 1.2V. This pin can be used to adjust the RUN pin hysteresis.
SS (Pin 4)
: Soft-Start Control Input. A capacitor to ground See Applications Information. at this pin sets the ramp time to full current output dur-
GND (Pin 8, Exposed Pad Pin 9):
Ground. The exposed ing start-up. A 5.5µA current is sourced out of this pin. If pad must be soldered to the printed circuit board ground left floating, the ramp time defaults to an internal 0.75ms plane for optimal electrical and thermal performance. soft-start. 3632fc 6 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION 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