Rainbow Electronics MAX1842 - Manual (Page 4)

MAX1742/MAX1842
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
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ELECTRICAL CHARACTERISTICS
(V IN = V CC = 3.3V, FBSEL = GND, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 3)
Note 2: Recommended operating frequency, not production tested.
Note 3: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
Input Voltage V
IN
3.0 5.5 V
V IN = 3V to 5.5V,
FBSEL = V CC
2.475 2.575
FBSEL = unconnected 1.485 1.545
FBSEL = REF 1.782 1.854
Preset Output Voltage V OUT
I LOAD = 0 to 1A
for MAX1742,
I
LOAD = 0 to 2.5A
for MAX1842,
V
FB = V OUT
FBSEL = GND 1.078 1.122
V
Adjustable Output Voltage
Range V IN = V CC = 3V to 5.5V, I LOAD = 0,
FBSEL = GND
V REF V IN V
Reference Voltage V REF 1.078 1.122 V
V IN = 4.5V 200 PMOS Switch
On-Resistance
R ON, P I LX = 0.5A
V IN = 3V 250
V IN = 4.5V 150 NMOS Switch
On-Resistance
R ON, N I LX = 0.5A
V IN = 3V 200
m Ω
MAX1742 1.2 1.8
Current-Limit Threshold I LIMIT
MAX1842 2.9 4.3
MAX1742 0.05 0.55
Idle Mode Current Threshold I IM
MAX1842 0.2 1.0
A
No-Load Supply Current I
IN
+ I
CC
V
FB
= 1.2V 600 µA
FB Input Bias Current I FB V FB = 1.2V 0 300 nA
Off-Time Default Period t OFF R TOFF = 110k Ω 0.85 1.15 µs