MAX1684 Datasheet, PDF (3/16 Pages) Maxim Integrated Products – Low-Noise, 14V Input, 1A, PWM Step-Down Converters

Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
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 other-
wise noted. Typical values are at T_A = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Quiescent Supply Current
in Dropout
STBY = low, V_IN = 2.7V
230
430
µA
Shutdown Supply Current
LX Leakage Current
Oscillator Frequency
I_LX
f_OSC
SHDN = low
V_IN = 14V, V_LX = 0 or 14V, SHDN = low
MAX1684
MAX1685
2
6
µA
20
µA
260
300
340
kHz
520
600
680
SYNC Capture Range
Maximum Duty Cycle
Constant-Frequency Minimum
Duty Cycle
Reference Output Voltage
Reference Load Regulation
Reference Supply Regulation
MAX1684
MAX1685
V_REF
(Note 3)
I_REF = 0
-1µA < I_REF < 50µA
2.7V < V_BOOT < 5.5V
MAX1684
MAX1685
180
350
kHz
360
700
100
%
10
%
20
1.238 1.251 1.264
V
4
15
mV
0.2
5
mV
CVL Regulator Output Voltage
V_IN = 3V to 14V, BOOT = AGND,
I_CVL = 0 to 5mA
2.7
3.0
3.15
V
CVL Dropout Voltage
BOOT = AGND, I_CVL = 5mA
120
mV
CVL Undervoltage Lockout
Threshold
BOOT = AGND, CVL falling edge,
typical hysteresis is 40mV
2.4
2.5
2.6
V
CVH with Respect to V_IN
I_CVH = -1mA
-5.0
-4.6
-4.1
V
BOOT Switchover Threshold
BOOT falling edge,
typical hysteresis is 0.1V
2.4
2.5
2.6
V
Thermal Shutdown Threshold
ILIM/SS Source Current
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
SYNC/PWM Pulse Width
Typical hysteresis is 10°C (Note 4)
V_ILIM/SS = 1.4V
V_IH
SHDN, STBY, SYNC/PWM
V_IL
SHDN, STBY, SYNC/PWM
High or low period
160
°C
3.3
4
4.65
µA
2
V
0.7
V
-1
1
µA
500
ns
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