Electrical characteristics – Rainbow Electronics MAX1842 User Manual
Page 4
MAX1742/MAX1842
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
4
_______________________________________________________________________________________
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