Datasheet

MAX1623
_______________________________________________________________________________________ 3
3A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
ELECTRICAL CHARACTERISTICS
(V
IN
= V
CC
= 5V, FBSEL unconnected, R
TOFF
= 110kΩ, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 4)
Note 2: Guaranteed by design, not production tested.
Note 3: Idle Mode threshold is defined as the transition point in the load-current range between Idle Mode and constant-off-time
operation.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
SHDN = GND or V
CC
V
IN
= 4.5V to 5.5V,
I
LOAD
= 0 to 3A
FBSEL = GND, adjustable output mode, V
FB
= 1.2V
V
CC
falling, 100mV hysteresis
V
IN
= 4.5V
V
IN
= 5.5V, V
LX
= 5.5V or 0
SHDN = GND
V
IN
= 4.5V
V
FBSEL = GND or REF (Note 2)
I
REF
= 0
Does not include switching losses
CONDITIONS
V0.8
FBSEL = unconnected
SHDN Input Low Voltage
µA-1 1
FBSEL = V
CC
SHDN Input Current
FBSEL = GND or REF
2.2
SHDN Input High Voltage
µs0.85 1.25Off-Time Default Period
µs0.55 4Off-Time Adjustment Range
nA-50 50FB Input Bias Current
V4.0 4.3Undervoltage Lockout Threshold
µA-20 20LX Leakage Current
µA10Shutdown Supply Current
µA600No-Load Supply Current
2.450 2.550
V
3.234 3.366
V4.5 5.5Input Voltage Range
Output Voltage
Ω
0.1NMOS Switch On-Resistance
Ω
0.1PMOS Switch On-Resistance
A3.5 4.75Current-Limit Threshold
1.075 1.110
VV
REF
3.8Output Adjustment Range
V1.075 1.110Reference Output Voltage
UNITSMIN TYP MAXPARAMETER