Datasheet LTM4657 (Analog Devices) - 3

LTM4657
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified internal operating temperature range (Note 2), otherwise specifications are at TA = 25°C. VIN = 12V per the typical application shown on the front page. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IQ(VIN) Input Supply Bias Current VIN = 12V, VOUT = 1.5V, MODE = INTVCC 70 mA VIN = 12V, VOUT = 1.5V, MODE = GND 18 mA Shutdown, RUN = 0, VIN = 12V 70 µA IS(VIN) Input Supply Current VIN = 12V, VOUT = 1.5V, IOUT = 8A 1.15 A IOUT(DC) Output Continuous Current VIN = 12V, VOUT = 1.5V 0 8 A Range ΔVOUT (Line)/VOUT Line Regulation Accuracy VOUT = 1.5V, VIN = 3.1V to 20V, IOUT = 0A l 0.04 0.15 % ΔVOUT (Load)/VOUT Load Regulation Accuracy VOUT = 1.5V, IOUT = 0A to 8A l 0.2 1.2 % VOUT(AC) Output Ripple Voltage IOUT = 0A, COUT = 100µF Ceramic, VIN = 12V, 5 mV VOUT = 1.5V ΔVOUT(START) Turn-On Overshoot IOUT = 0A, COUT = 100µF Ceramic, VIN = 12V, 30 mV VOUT = 1.5V tSTART Turn-On Time COUT = 100µF Ceramic, No Load, TRACK/SS = 0.01µF, 2.5 ms VIN = 12V, VOUT = 1.5V ΔVOUTLS Peak Deviation for Dynamic Load: 0% to 50% to 0% of Full Load, COUT = 47µF 160 mV Load Ceramic, VIN = 12V, VOUT = 1.5V tSETTLE Settling Time for Dynamic Load: 0% to 50% to 0% of Full Load, COUT = 47µF 40 µs Load Step Ceramic, VIN = 12V, VOUT = 1.5V IOUTPK Output Current Limit VIN = 12V, VOUT = 1.5V 13 A VFB Voltage at FB Pin IOUT = 0A, VOUT = 1.5V l 0.495 0.50 0.505 V IFB Current at FB Pin (Note 4) ±50 nA RFBHI Resistor Between VOUT and 60.05 60.40 60.75 kΩ FB Pins ITRACK/SS Track Pin Soft-Start Pull-Up TRACK/SS = 0V 6 10 µA Current VIN(UVLO) VIN Undervoltage Lockout VIN Falling 2.5 2.7 2.9 V VIN Hysteresis 250 mV tON(MIN) Minimum On-Time (Note 4) 25 ns tOFF(MIN) Minimum Off-Time (Note 4) 50 ns VPGOOD PGOOD Trip Level VFB With Respect to Set Output VFB Ramping Negative –11 –8 –5 % VFB Ramping Positive 5 8 11 % IPGOOD PGOOD Leakage 2 µA VPGL PGOOD Voltage Low IPGOOD = 1mA 0.02 0.1 V VINTVCC Internal VCC Voltage VIN = 4V to 20V 3.2 3.3 3.4 V fOSC Oscillator Frequency 500 kHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings controls. The LTM4657I is guaranteed to meet specifications over the may cause permanent damage to the device. Exposure to any Absolute full –40°C to 125°C internal operating temperature range. Note that the Maximum Rating condition for extended periods may affect device maximum ambient temperature consistent with these specifications is reliability and lifetime. determined by specific operating conditions in conjunction with board
Note 2:
The LTM4657 is tested under pulsed load conditions such that layout, the rated package thermal resistance and other environmental T factors. J ≈ TA. The LTM4657E is guaranteed to meet performance specifications over the 0°C to 125°C internal operating temperature range. Specifications
Note 3:
See output current derating curves for different VIN, VOUT and TA. over the –40°C to 125°C internal operating temperature range are assured
Note 4:
100% tested at wafer level. by design, characterization and correlation with statistical process Rev 0 For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Package Description Package Photo Design Resources Related Parts