MAX1556_1 Datasheet, PDF (3/12 Pages) Maxim Integrated Products – 16μA IQ, 1.2A PWM Step-Down DC-DC Converters

16µA I_Q, 1.2A PWM DC-DC
Step-Down Converters
ELECTRICAL CHARACTERISTICS (continued)
(V_IN = V_INP = V_SHDN = 3.6V, T_A = - 40°C to +85°C. Typical values are at T_A = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Line Regulation
p-Channel On-Resistance
n-Channel On-Resistance
p-Channel Current-Limit
Threshold
CONDITIONS
MAX1556,
D1 = IN, D2 = GND
MAX1557,
D1 = IN, D2 = GND
MAX1556
MAX1557
V_IN = 2.6V to 3.6V
V_IN = 3.6V to 5.5V
V_IN = 2.6V to 3.6V
V_IN = 3.6V to 5.5V
V_IN = 3.6V
V_IN = 2.6V
V_IN = 3.6V
V_IN = 2.6V
V_IN = 3.6V
V_IN = 2.6V
MAX1556
MAX1557
MIN TYP MAX
-0.37
0.33
-0.1
0.09
0.19 0.35
0.23
0.35
0.7
0.42
0.27 0.48
0.33
1.5
1.8
2.1
0.8
1.0
1.2
n-Channel Zero Crossing
Threshold
20
35
45
MAX1556
1.8
RMS LX Output Current
MAX1557
1.0
LX Leakage Current
V_IN = 5.5V, LX =
GND or IN
T_A = +25°C
T_A = +85°C
0.1
10
0.1
Maximum Duty Cycle
100
Minimum Duty Cycle
0
Internal Oscillator Frequency
0.9
1
1.1
SS Output Impedance
SS Discharge Resistance
∆V_SS / I_SS for I_SS = 2µA
SHDN = GND, 1mA sink current
130 200 300
90
200
Thermal-Shutdown Threshold
+160
Thermal-Shutdown Hysteresis
15
LOGIC INPUTS (D1, D2, SHDN)
Input-Voltage High
2.6V ≤ V_IN ≤ 5.5V
1.4
Input-Voltage Low
0.4
Input Leakage
T_A = +25°C
T_A = +85°C
0.1
1
0.1
Note 1: All units are 100% production tested at T_A = +25°C. Limits over the operating range are guaranteed by design.
Note 2: For the MAX1556, 3.3V output accuracy is specified with a 4.2V input.
UNITS
%
Ω
Ω
A
mA
A_RMS
µA
%
%
MHz
kΩ
Ω
°C
°C
V
V
µA
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