Datasheet LTC3561A (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 1A, 4MHz, Synchronous Step-Down DC/DC Converter |
| Pages / Page | 20 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 364 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LTC3561A
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, RT = 125k unless otherwise specified. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IS Input DC Supply Current (Note 4) Active Mode VFB = 0.75V 330 450 µA Shutdown VSHDN/RT = 3.6V 0.1 1 µA VSHDN/RT Shutdown Threshold High Active VIN – 0.6 VIN – 0.4 V Oscillator Resistor 125k 1M Ω fOSC Oscillator Frequency RT = 125k 2.25 2.5 2.8 MHz (Note 7) 4 MHz ILIM Peak Switch Current Limit VFB = 0.5V 1.3 2.0 2.5 A RDS(ON) Top Switch On-Resistance (Note 6) 0.15 0.18 Ω Bottom Switch On-Resistance (Note 6) 0.13 0.16 Ω ISW(LKG) Switch Leakage Current VIN = 5V, VSHDN/RT = 3.6V, VSW = 0V or 5V 0.01 1 µA VUVLO Undervoltage Lockout Threshold VIN Ramping Down 1.8 2.1 2.4 V tSOFT-START 10% to 90% of Regulation 0.5 0.8 1 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
TJ is calculated from the ambient TA and power dissipation PD may cause permanent damage to the device. Exposure to any Absolute according to the following formulas: Maximum Rating condition for extended periods may affect device TJ = T A + (PD • 43°C/W) reliability and lifetime.
Note 6:
Switch on-resistance is sampled at wafer level measurements and
Note 2:
The LTC3561AEDD is guaranteed to meet specified performance assured by design, characterization and correlation with statistical process specifications from 0°C to 85°C junction temperature. Specifications over controls. the –40°C to 125°C operating junction temperature range are assured by
Note 7:
4MHz operation is guaranteed by design but not production tested design, characterization and correlation with statistical process controls. and is subject to duty cycle limitations (see Applications Information). The LTC3561AIDD is guaranteed over the full –40°C to 125°C operating junction temperature range.
Note 8:
This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction
Note 3:
The LTC3561A is tested in a feedback loop which servos VFB to the temperature will exceed 125°C when overtemperature protection is active. midpoint for the error amplifier (VITH = 0.7V). Continuous operation above the specified maximum operating junction
Note 4:
Dynamic supply current is higher due to the internal gate charge temperature may impair device reliability. being delivered at the switching frequency.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VIN = 3.6V, fO = 1MHz, unless otherwise noted. Efficiency vs Input Voltage Efficiency vs Output Current Efficiency vs Output Current
100 100 100 VOUT = 1.8V VOUT = 1.5V 95 IOUT = 100mA VOUT = 1.8V 90 90 90 80 80 85 IOUT = 1A 70 70 80 60 60 75 IOUT = 10mA 50 50 70 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 65 30 30 60 20 V 20 IN = 2.7V VIN = 2.7V 55 10 VIN = 3.6V 10 VIN = 3.6V V V 50 IN = 4.2V IN = 4.2V 0 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 1 10 100 1000 10000 1 10 100 1000 10000 INPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 3561A G01 3561A G02 3561A G03 3561afa For more information www.linear.com/LTC3561A 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, RT = 125k unless otherwise specified. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IS Input DC Supply Current (Note 4) Active Mode VFB = 0.75V 330 450 µA Shutdown VSHDN/RT = 3.6V 0.1 1 µA VSHDN/RT Shutdown Threshold High Active VIN – 0.6 VIN – 0.4 V Oscillator Resistor 125k 1M Ω fOSC Oscillator Frequency RT = 125k 2.25 2.5 2.8 MHz (Note 7) 4 MHz ILIM Peak Switch Current Limit VFB = 0.5V 1.3 2.0 2.5 A RDS(ON) Top Switch On-Resistance (Note 6) 0.15 0.18 Ω Bottom Switch On-Resistance (Note 6) 0.13 0.16 Ω ISW(LKG) Switch Leakage Current VIN = 5V, VSHDN/RT = 3.6V, VSW = 0V or 5V 0.01 1 µA VUVLO Undervoltage Lockout Threshold VIN Ramping Down 1.8 2.1 2.4 V tSOFT-START 10% to 90% of Regulation 0.5 0.8 1 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
TJ is calculated from the ambient TA and power dissipation PD may cause permanent damage to the device. Exposure to any Absolute according to the following formulas: Maximum Rating condition for extended periods may affect device TJ = T A + (PD • 43°C/W) reliability and lifetime.
Note 6:
Switch on-resistance is sampled at wafer level measurements and
Note 2:
The LTC3561AEDD is guaranteed to meet specified performance assured by design, characterization and correlation with statistical process specifications from 0°C to 85°C junction temperature. Specifications over controls. the –40°C to 125°C operating junction temperature range are assured by
Note 7:
4MHz operation is guaranteed by design but not production tested design, characterization and correlation with statistical process controls. and is subject to duty cycle limitations (see Applications Information). The LTC3561AIDD is guaranteed over the full –40°C to 125°C operating junction temperature range.
Note 8:
This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction
Note 3:
The LTC3561A is tested in a feedback loop which servos VFB to the temperature will exceed 125°C when overtemperature protection is active. midpoint for the error amplifier (VITH = 0.7V). Continuous operation above the specified maximum operating junction
Note 4:
Dynamic supply current is higher due to the internal gate charge temperature may impair device reliability. being delivered at the switching frequency.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VIN = 3.6V, fO = 1MHz, unless otherwise noted. Efficiency vs Input Voltage Efficiency vs Output Current Efficiency vs Output Current
100 100 100 VOUT = 1.8V VOUT = 1.5V 95 IOUT = 100mA VOUT = 1.8V 90 90 90 80 80 85 IOUT = 1A 70 70 80 60 60 75 IOUT = 10mA 50 50 70 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 65 30 30 60 20 V 20 IN = 2.7V VIN = 2.7V 55 10 VIN = 3.6V 10 VIN = 3.6V V V 50 IN = 4.2V IN = 4.2V 0 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 1 10 100 1000 10000 1 10 100 1000 10000 INPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 3561A G01 3561A G02 3561A G03 3561afa For more information www.linear.com/LTC3561A 3
