Datasheet LT3740 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Wide Operating Range, Valley Mode, No RSENSE Synchronous Step-Down Controller |
| Pages / Page | 20 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 244 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LT3740
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C, VIN = 5V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
SHDN Voltage to Enable Device ● 1.1 V SHDN Voltage to Disable Device ● 0.5 V TGATE On Voltage 5.5 V TGATE Off Voltage 0.2 V BGATE On Voltage 5.5 V BGATE Off Voltage 0.2 V TGATE Rise Time CLOAD = 3300pF 30 ns TGATE Fall Time CLOAD = 3300pF 30 ns BGATE Rise Time CLOAD = 3300pF 50 ns BGATE Fall Time CLOAD = 3300pF 50 ns PGOOD Threshold ● 720 740 765 mV PGOOD Low Voltage IPGOOD = 100μA ● 0.2 V PGOOD Current Capacity 500 μA Internal Boost Switching Frequency 0.8 1 1.2 MHz Internal Boost Switch Current Limit 360 440 520 mA (BIAS – VIN) in Operation 7.8 V (BIAS – VIN) to Start Controller 7.2 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 2:
The LT3740E is guaranteed to meet performance specifi cations may cause permanent damage to the device. Exposure to any Absolute from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating Maximum Rating condition for extended periods may affect device temperature range are assured by design, characterization and correlation reliability and lifetime. with statistical process controls.
Note 3:
The minimum off time of the LT3740 application consists of the minimum BGATE on time, the delay from TGATE OFF to BGATE ON (80ns) and the delay from BGATE OFF to TGATE ON (80ns).
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise noted) Transient Response Transient Response Shutdown Pin Start-Up
LOAD STEP 0A TO 10A SHDN V V IN = 5V, VOUT = 1.8V OUT 2V/DIV PAGE 17 CIRCUIT 50mV/DIV V I OUT L 2A/DIV LOAD STEP 0A TO 10A 50mV/DIV VIN = 10V, VOUT = 2.5V FIGURE 4 CIRCUIT VO 2V/DIV IL 5A/DIV IL 5A/DIV VIN = 10V, VOUT = 2.5V ILOAD = 3A 3740 G01 3740 G02 3740 G03 20μs/DIV 10μs/DIV 2ms/DIV 3740fc 3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C, VIN = 5V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
SHDN Voltage to Enable Device ● 1.1 V SHDN Voltage to Disable Device ● 0.5 V TGATE On Voltage 5.5 V TGATE Off Voltage 0.2 V BGATE On Voltage 5.5 V BGATE Off Voltage 0.2 V TGATE Rise Time CLOAD = 3300pF 30 ns TGATE Fall Time CLOAD = 3300pF 30 ns BGATE Rise Time CLOAD = 3300pF 50 ns BGATE Fall Time CLOAD = 3300pF 50 ns PGOOD Threshold ● 720 740 765 mV PGOOD Low Voltage IPGOOD = 100μA ● 0.2 V PGOOD Current Capacity 500 μA Internal Boost Switching Frequency 0.8 1 1.2 MHz Internal Boost Switch Current Limit 360 440 520 mA (BIAS – VIN) in Operation 7.8 V (BIAS – VIN) to Start Controller 7.2 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 2:
The LT3740E is guaranteed to meet performance specifi cations may cause permanent damage to the device. Exposure to any Absolute from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating Maximum Rating condition for extended periods may affect device temperature range are assured by design, characterization and correlation reliability and lifetime. with statistical process controls.
Note 3:
The minimum off time of the LT3740 application consists of the minimum BGATE on time, the delay from TGATE OFF to BGATE ON (80ns) and the delay from BGATE OFF to TGATE ON (80ns).
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise noted) Transient Response Transient Response Shutdown Pin Start-Up
LOAD STEP 0A TO 10A SHDN V V IN = 5V, VOUT = 1.8V OUT 2V/DIV PAGE 17 CIRCUIT 50mV/DIV V I OUT L 2A/DIV LOAD STEP 0A TO 10A 50mV/DIV VIN = 10V, VOUT = 2.5V FIGURE 4 CIRCUIT VO 2V/DIV IL 5A/DIV IL 5A/DIV VIN = 10V, VOUT = 2.5V ILOAD = 3A 3740 G01 3740 G02 3740 G03 20μs/DIV 10μs/DIV 2ms/DIV 3740fc 3
