Rainbow Electronics MAX1842 - Manual (Page 3)

MAX1742/MAX1842
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
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ELECTRICAL CHARACTERISTICS (continued)
(V IN = V CC = 3.3V, FBSEL = GND, T A = 0°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX1742 1.3 1.5 1.7
Current-Limit Threshold I LIMIT
MAX1842 3.1 3.6 4.1
A
RMS LX Output Current 3.1 A
MAX1742 0.1 0.3 0.5
Idle Mode Current Threshold I IM
MAX1842 0.3 0.6 0.9
A
Switching Frequency f (Note 2) 1 MHz
No-Load Supply Current I
IN
+ I
CC
V
FB
= 1.2V 350 600 µA
Shutdown Supply Current I CC (SHDN) SHDN = GND <1 5 µA
PMOS Switch Off-Leakage
Current
I IN
SHDN = GND 15 µA
Thermal Shutdown Threshold T SHDN Hysteresis = 15°C 160 °C
Undervoltage Lockout Threshold V UVLO V IN falling, hysteresis = 90mV 2.5 2.6 2.7 V
FB Input Bias Current I FB V FB = 1.2V 0 60 250 nA
R TOFF = 110k Ω 0.9 1.00 1.1
R TOFF = 30.1k Ω 0.24 0.30 0.37 Off-Time Default Period t OFF
R TOFF = 499k Ω 3.8 4.5 5.2
µs
Off-Time Startup Period t OFF FB = GND 4 ✕ t OFF µs
On-Time Period t
ON
(Note 2) 0.4 µs
SS Source Current I SS 4 5 6 µA
SS Sink Current I SS V SS = 1V 100 µA
SHDN Input Current I SHDN V SHDN = 0 to V CC -1 1 µA
SHDN Input Low Threshold V IL 0.8 V
SHDN Input High Threshold V IH 2.0 V
FBSEL Input Current -4 +4 µA
FBSEL = GND 0.2
FBSEL = REF 0.9 1.3
FBSEL = unconnected
0.7 ✕ VCC
- 0.2
0.7 ✕ VCC
+0.2
FBSEL Logic Thresholds
FBSEL = V CC
V CC
- 0.2
V