Datasheet LTC3722-1, LTC3722-2 (Analog Devices) - 3

LTC3722-1/LTC3722-2
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VCC = 9.5V, CT = 270pF, RDPRG = 60.4k, RSPRG = 100k, unless otherwise noted (Note 6). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply
VCCUV VCC Under Voltage Lockout Measured on VCC 10.25 10.5 V VCCHY VCC UVLO Hysteresis Measured on VCC 3.8 4.2 V ICCST Start-Up Current VCC = VUVLO – 0.3V LTC3722E-1/LTC3722I-1/LTC3722E-2/LTC3722I-2 l 145 230 µA LTC3722H-1 l 145 250 µA ICCRN Operating Current No Load on Outputs 5 8 mA VSHUNT Shunt Regulator Voltage Current into VCC = 10mA 10.3 10.8 V RSHUNT Shunt Resistance Current into VCC = 10mA to 17mA 1.1 3.5 Ω SUVLO System UVLO Threshold Measured on UVLO Pin, 10mA into VCC 4.8 5.0 5.2 V SHYST System UVLO Hysteresis Current Current Flows Out of UVLO Pin 8.5 10 11.5 µA
Delay Blocks
DTHR Delay Pin Threshold SBUS = 1.5V l 1.4 1.5 1.6 V ADLY and PDLY SBUS = 2.25V l 2.1 2.25 2.4 V DHYS Delay Hysteresis Current SBUS = 1.5V, ADLY/PDLY = 1.7V 1.3 mA ADLY and PDLY DTMO Delay Timeout RDPRG = 60.4K 100 ns DFXT Fixed Delay Threshold Measured on SBUS 4 V DFTM Fixed Delay Time SBUS = VREF , ADLY, PDLY = 1V 70 ns
Phase Modulator
ICS CS Discharge Current CS = 1V, COMP = 0V, CT = 4V, 50 mA LTC3722-1 Only ISLP Slope Compensation Current Measured on CS, CT = 1V 30 µA CT = 2.25V 68 µA DCMAX Maximum Phase Shift COMP = 4.5V l 95 98.5 % DCMIN Minimum Phase Shift COMP = 0V l 0 0.5 %
Oscillator
OSCI Initial Accuracy TA = 25°C, CT = 270pF 225 250 275 kHz OSCT Total Variation VCC = 6.5V to 9.5V l 215 250 285 kHz OSCV CT Ramp Amplitude Measured on CT 2.5 V OSYT SYNC Threshold Measured on SYNC 1.6 1.9 2.2 V OSYW Minimum SYNC Pulse Width Measured at Outputs (Note 2) 75 ns OSYR SYNC Frequency Range Measured at Outputs (Note 2) 1000 kHz
Error Amplifier
VFB FB Input Voltage COMP = 2.5V (Note 4) 1.172 1.204 1.236 V FBI FB Input Range Measured on FB (Note 5) –0.3 2.5 V AVOL Open-Loop Gain COMP = 1V to 3V (Note 4) 70 90 dB IIB Input Bias Current COMP = 2.5V (Note 4) 5 20 nA VOH Output High Load on COMP = –100µA 4.7 4.92 V VOL Output Low Load on COMP = 100µA 0.18 0.4 V ISOURCE Output Source Current COMP = 2.5V 400 800 µA ISINK Output Sink Current COMP = 2.5V 2 5 mA Rev C For more information www.analog.com 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagram Operation Revision History Typical application Related Parts