Rainbow Electronics MAX1685 - Manual (Page 3)

MAX1684/MAX1685
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V IN = V SHDN = 6V, STBY = SYNC/PWM = CVL, V BOOT = V OUT , FB = AGND, circuit of Figure 1, T A = 0°C to +85°C, unless otherwise
noted. Typical values are at T A = +25°C.)
STBY = low, V
IN = 2.7V
CONDITIONS
µA 230 430
Quiescent Supply Current
in Dropout
UNITS MIN TYP MAX SYMBOL PARAMETER
SHDN = low µA 2 6 Shutdown Supply Current
MAX1684 260 300 340
MAX1684 180 350
V IN = 14V, V LX = 0 or 14V, SHDN = low
SYNC Capture Range
MAX1685
kHz
520 600 680
f OSC Oscillator Frequency
µA 20 I LX LX Leakage Current
% 100 Maximum Duty Cycle
(Note 3) %
20
MAX1685
Constant-Frequency Minimum
Duty Cycle 10
-1µA < I REF < 50µA mV 4 15 Reference Load Regulation
V IN = 3V to 14V, BOOT = AGND,
I CVL = 0 to 5mA
V 2.7 3.0 3.15
I REF = 0
CVL Regulator Output Voltage
2.7V < V BOOT < 5.5V mV 0.2 5 Reference Supply Regulation
V 1.238 1.251 1.264 V REF Reference Output Voltage
kHz
360 700
MAX1684
MAX1685
BOOT = AGND, I CVL = 5mA mV 120 CVL Dropout Voltage
Typical hysteresis is +10°C (Note 4) °C 160 Thermal Shutdown Threshold
BOOT falling edge,
typical hysteresis is 0.1V
V 2.35 2.5 2.65 BOOT Switchover Threshold
I CVH = -1mA V -5.0 -4.6 -4.1 CVH with Respect to V IN
SHDN, STBY, SYNC/PWM
V 2 V IH Logic Input High Voltage
V ILIM/SS = 1.4V µA 3.3 4 4.65 ILIM/SS Source Current
High or low period ns 500 SYNC/PWM Pulse Width
SHDN, STBY, SYNC/PWM µA -1 1 Logic Input Current
0.7 V IL Logic Input Low Voltage
BOOT = AGND, CVL falling edge,
typical hysteresis is 40mV
V 2.35 2.5 2.6
CVL Undervoltage Lockout
Threshold
V