Datasheet LT1534 (Analog Devices) - 3

LT1534/LT1534-1
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C, VIN = 5V, VC = 0.9V, VFB = VREF. COL, SHDN, NFB, all other pins open unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Error Amplifiers
VNFR Negative Feedback Reference Voltage Measured at Negative Feedback Pin with ● – 2.550 – 2.500 – 2.420 V Feedback Pin Open INFR Negative Feedback Input Current VNFB = VNFR ● – 37 – 25 µA NFBREG Negative Feedback Reference Voltage 2.7V ≤ VIN ≤ 23V ● 0.002 0.05 %/V Line Regulation 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 RVSL = RCSL = 4.9k, fOSC = 25kHz ● 88 91 % tIBL Switch Current Limit Blanking Time 200 ns BVCOL Output Switch Breakdown Voltage 2.7V ≤ VIN ≤ 23V ● 35 V RON Output Switch-On Resistance ICOL = 1.5A, Both COL Pins Tied Together ● 0.25 0.43 Ω ILIM Switch Current Limit Duty Cycle = 30% 2 A Duty Cycle = 80% 1.6 A ∆IIN/∆ISW Supply Current Increase During 16 mA/A Switch-On Time
Slew Control
VSLEWR Output Voltage Slew Rising Edge RVSL, RCSL = 17k 11 V/µs VSLEWF Output Voltage Slew Falling Edge RVSL, RCSL = 17k 14.5 V/µs ISLEWR Output Current Slew Rising Edge RVSL, RCSL = 17k 1.3 A/µs ISLEWF Output Current Slew Falling Edge RVSL, RCSL = 17k 1.3 A/µs
Note 1:
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 3