Datasheet MAX1684, MAX1685 (Maxim) - 2

Low-Noise, 14V Input, 1A, PWM Step-Down Converters ABSOLUTE MAXIMUM RATINGS
AIN to AGND ..-0.3 to +15V CVL Current ...-1mA to +10mA IN to PGND ..-0.3V to (VAIN + 0.3V) LX Peak Current (Internally Limited) ...2.3A LX to PGND ...-0.5V to (VIN + 0.3V) Continuous Power Dissipation (TA = +70°C) PGND to AGND ..±0.3V 16-Pin QSOP (derate 8.3mW/°C above +70°C)..667mW SHDN to AGND ...-0.3V to (VAIN + 0.3V) Operating Temperature Range ...-40°C to +85°C ILIM/SS, FB, CC, BOOT, REF to AGND ..-0.3V to (VCVL + 0.3V) Junction Temperature ..+150°C CVH to IN..-6V to +0.3V Storage Temperature Range ...-65°C to +150°C CVL, STBY, SYNC/PWM to AGND..-0.3V to +6V Lead Temperature (soldering, 10s) ...+300°C Reference Current ..±1mA Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = V SHDN = 6V, STBY = SYNC/PWM = CVL, VBOOT = VOUT, FB = AGND, circuit of Figure 1,
TA = 0°C to +85°C
, unless otherwise noted. Typical values are at TA = +25°C.)
MAX1684/MAX1685 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 2.7 14 V Feedback Voltage VFB VFB = VOUT, ILOAD = 0 to 1A 1.238 1.251 1.264 V Output Voltage (3.3V Mode) VOUT FB = AGND, ILOAD = 0 to 1A 3.296 3.333 3.368 V Output Load Regulation VFB = VOUT, ILOAD = 0 to 1A 0.01 % Output Current Capability VIN = 5V to 14V 1 A Output Adjust Range BOOT = AGND (Note 1) VREF VIN V FB Input Current IFB VFB = 1.4V -50 50 nA High-side switch, VIN = 6V 0.24 0.5 On-Resistance, P-Channel Ω ILX = 1A VIN = 2.7V 0.34 0.8 On-Resistance, N-Channel Low-side switch, VIN = 2.7V, ILX = 200mA 3 8 Ω Current Limit in PWM Mode ILIM 1.2 1.75 2.3 A Pulse-Skipping Current Threshold SYNC/PWM = low 285 380 475 mA Current Limit in Low-Power ILIMLP STBY = low 285 380 475 mA Mode Current Limit, N-Channel SYNC/PWM = high 0.15 0.4 0.9 A MAX1684 -10 50 100 Zero Crossing Threshold SYNC/PWM = low mA MAX1685 20 80 130 PWM mode, MAX1684 13 33 SYNC/PWM = high, VBOOT = 3.3V MAX1685 25 65 (Note 2) Quiescent Power Consumption mW Normal mode, SYNC/PWM = low, 0.9 2 VBOOT = 3.3V (Note 2) Low-power mode, STBY = low, 0.14 0.27 VBOOT = 3.3V (Note 2)
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