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LTC4449 Datasheet(PDF) 5 Page - Linear Technology |
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LTC4449 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 108 page  LTC3882-1 5 Rev A For more information www.analog.com ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IC Supply VCC VCC Voltage Range VDD33 = Internal LDO 4.5 13.8 V VDD33_EXT VDD33 Voltage Range VCC = VDD33 (Note 6) l 3 3.6 V VUVLO Undervoltage Lockout Threshold VDD33 Rising Hysteresis l 42 3 V mV IQ IC Operating Current 32 mA tINIT Controller Initialization Time Delay from RESTORE_USER_ALL, MFR_RESET or VDD33 > VUVLO Until TON_DELAY Can Begin 35 ms VDD33 Linear Regulator VDD33 VDD33 Regulator Output Voltage VCC ≥ 4.5V 3.2 3.3 3.4 V IDD33 VDD33 Current Limit VDD33 = 2.8V VDD33 = 0V 85 40 mA mA VDD25 Linear Regulator VDD25 VDD25 Regulator Output Voltage 2.25 2.5 2.75 V IDD25 VDD25 Current Limit 95 mA PWM Control Loops VINSNS VIN Sense Voltage Range 3 38 V RVINSNS VINSNS Input Resistance 278 kΩ VOUT_R0 Range 0 Maximum VOUT Range 0 Set Point Error (Note 7) Range 0 Set Point Resolution 0.6V ≤ VOUT ≤ 5V 0.6V ≤ VOUT ≤ 5V l –0.5 5.25 ±0.2 1.375 0.5 V % % mV VOUT_R1 Range 1 Maximum VOUT Range 1 Set Point Error (Note 7) Range 1 Set Point Resolution 0.6V ≤ VOUT ≤ 2.5V 0.6V ≤ VOUT ≤ 2.5V l –0.5 2.65 ±0.2 0.6875 0.5 V % % mV IVSENSE VSENSE Input Current VSENSE+ = 5.5V VSENSE– = 0V 235 –335 µA µA VLINEREG VCC Line Regulation, No Output Servo 4.5V ≤ VCC ≤ 13.2V (See Test Circuit) –0.02 0.02 %/V AVP AVP ∆VOUT AVP = 10%, VOUT_COMMAND = 1.8V, ISENSE Differential Step 3mV to 12mV with IOUT_OC_WARN_LIMIT = 15mV l –118 –108 –96 mV AV(OL) Error Amplifier Open-Loop Voltage Gain 87 dB SR Error Amplifier Slew Rate 9.5 V/µs f0dB Error Amplifier Bandwidth (Note 12) 30 MHz ICOMP Error Amplifier Output Current Sourcing Sinking –2.6 34 mA mA RVSFB Resistance Between VSENSE+ and FB Range 0 Range 1 l l 52 37 67 49 83 61 kΩ kΩ VISENSE ISENSE Differential Input Range ±70 mV IISENSE ISENSE± Input Current 0V ≤ VPIN ≤ 5.5V –1 ±0.1 1 µA IAVG_VOS IAVG Current Sense Offset Referred to ISENSE Inputs l –600 ±175 650 µV µV VSIOS Slave Current Sharing Offset Referred to ISENSE Inputs l –800 ±300 700 µV µV fSYNC SYNC Frequency Error 250kHz ≤ fSYNC ≤ 1.25MHz l –10 10 % The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TJ = 25°C (Note 2). VCC = 5V, VSENSE0+ = VSENSE1+ = 1.8V, VSENSE0– = VSENSE1– = IAVG_GND = GND = 0V, fSYNC = 500kHz (externally driven) unless otherwise specified. |
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