Datasheet LT1533 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Ultralow Noise 1A Switching Regulator |
| Pages / Page | 20 / 3 |
| File Format / Size | PDF / 330 Kb |
| Document Language | English |
Model Line for this Datasheet
Text Version of Document
LT1533
ELECTRICAL CHARACTERISTICS VIN = 5V, VC = 0.9V, VFB = VREF. COL A, COL B, SHDN, NFB, DUTY pins open, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
gm Error Amplifier Transconductance ∆IC = ±25µA 1100 1500 1900 µmho ● 700 2300 µmho IESK Error Amplifier Sink Current VFB = VREF + 150mV, VC = 0.9V, VSHDN = 1V ● 120 200 350 µA IESRC Error Amplifier Source Current VFB = VREF – 150mV, VC = 0.9V, VSHDN = 1V ● 120 200 350 µA VCLH Error Amplifier Clamp Voltage High Clamp, VFB = 1V 1.33 V VCLL Error Amplifier Clamp Voltage Low Clamp, VFB = 1.5V 0.1 V AV Error Amplifier Voltage Gain 180 250 V/V
Oscillator and Sync
fMAX Maximum Switch Frequency 250 kHz fSYNC Synchronization Frequency Range fOSC = 250kHz ● 375 kHz RSYNC SYNC Pin Input Resistance 40 kΩ VFBfs FB Pin Threshold for Frequency Shift 5% Reduction from Nominal 0.4 V
Output Switches
DCMAX Maximum Switch Duty Cycle DUTY Pin Open, RVSL = RCSL = 4.9k, fOSC = 25kHz ● 44 45.5 % DUTY Pin Grounded, Forced 50% Duty Cycle 50.0 % tIBL Switch Current Limit Blanking Time 200 ns BV Output Switch Breakdown Voltage 2.7V ≤ VIN ≤ 23V ● 25 30 V RON Output Switch-On Resistance ICOL A or ICOL B = 0.75A ● 0.5 0.85 Ω ILIM(MAX) Maximum Current Limit Duty Cycle = 15% 1 1.25 1.8 A Short-Circuit Current Limit Duty Cycle = 40% 0.8 A ∆IIN/∆ISW Supply Current Increase During 16 mA/A Switch-On Time VDUTYTH DUTY Pin Threshold 0.35
Slew Control
VSLEWR Output Voltage Slew Rising Edge Either A or B, RVSL, RCSL = 17k 11 V/µs VSLEWF Output Voltage Slew Falling Edge Either A or B, RVSL, RCSL = 17k 14.5 V/µs ISLEWR Output Current Slew Rising Edge Either A or B, RVSL, RCSL = 17k 1.3 A/µs ISLEWF Output Current Slew Falling Edge Either A or B, RVSL, RCSL = 17k 1.3 A/µs The ● denotes specifications that apply over the full operating
Note 2:
The LT1533 is designed to operate over the junction temperature temperature range. range of – 4 0°C to 125°C, but is neither tested nor guaranteed beyond 0°C
Note 1:
Absolute Maximum Ratings are those values beyond which the life to 100°C for C grade or – 40°C to 100°C for I grade. of a device may be impaired. 3
ELECTRICAL CHARACTERISTICS VIN = 5V, VC = 0.9V, VFB = VREF. COL A, COL B, SHDN, NFB, DUTY pins open, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
gm Error Amplifier Transconductance ∆IC = ±25µA 1100 1500 1900 µmho ● 700 2300 µmho IESK Error Amplifier Sink Current VFB = VREF + 150mV, VC = 0.9V, VSHDN = 1V ● 120 200 350 µA IESRC Error Amplifier Source Current VFB = VREF – 150mV, VC = 0.9V, VSHDN = 1V ● 120 200 350 µA VCLH Error Amplifier Clamp Voltage High Clamp, VFB = 1V 1.33 V VCLL Error Amplifier Clamp Voltage Low Clamp, VFB = 1.5V 0.1 V AV Error Amplifier Voltage Gain 180 250 V/V
Oscillator and Sync
fMAX Maximum Switch Frequency 250 kHz fSYNC Synchronization Frequency Range fOSC = 250kHz ● 375 kHz RSYNC SYNC Pin Input Resistance 40 kΩ VFBfs FB Pin Threshold for Frequency Shift 5% Reduction from Nominal 0.4 V
Output Switches
DCMAX Maximum Switch Duty Cycle DUTY Pin Open, RVSL = RCSL = 4.9k, fOSC = 25kHz ● 44 45.5 % DUTY Pin Grounded, Forced 50% Duty Cycle 50.0 % tIBL Switch Current Limit Blanking Time 200 ns BV Output Switch Breakdown Voltage 2.7V ≤ VIN ≤ 23V ● 25 30 V RON Output Switch-On Resistance ICOL A or ICOL B = 0.75A ● 0.5 0.85 Ω ILIM(MAX) Maximum Current Limit Duty Cycle = 15% 1 1.25 1.8 A Short-Circuit Current Limit Duty Cycle = 40% 0.8 A ∆IIN/∆ISW Supply Current Increase During 16 mA/A Switch-On Time VDUTYTH DUTY Pin Threshold 0.35
Slew Control
VSLEWR Output Voltage Slew Rising Edge Either A or B, RVSL, RCSL = 17k 11 V/µs VSLEWF Output Voltage Slew Falling Edge Either A or B, RVSL, RCSL = 17k 14.5 V/µs ISLEWR Output Current Slew Rising Edge Either A or B, RVSL, RCSL = 17k 1.3 A/µs ISLEWF Output Current Slew Falling Edge Either A or B, RVSL, RCSL = 17k 1.3 A/µs The ● denotes specifications that apply over the full operating
Note 2:
The LT1533 is designed to operate over the junction temperature temperature range. range of – 4 0°C to 125°C, but is neither tested nor guaranteed beyond 0°C
Note 1:
Absolute Maximum Ratings are those values beyond which the life to 100°C for C grade or – 40°C to 100°C for I grade. of a device may be impaired. 3
