MAX1623 Datasheet, PDF (3/12 Pages) Maxim Integrated Products – 3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

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 3)
PARAMETER
CONDITIONS
MIN TYP
Input Voltage Range
4.5
Output Voltage
V_IN = 4.5V to 5.5V,
I_LOAD = 0 to 3A
FBSEL = unconnected
FBSEL = V_CC
FBSEL = GND or REF
3.234
2.450
1.075
Output Adjustment Range
Reference Output Voltage
Current-Limit Threshold
FBSEL = GND or REF (Note 1)
I_REF = 0
V_REF
1.075
3.5
PMOS Switch On-Resistance
NMOS Switch On-Resistance
No-Load Supply Current
Shutdown Supply Current
V_IN = 4.5V
V_IN = 4.5V
Does not include switching losses
SHDN = GND
LX Leakage Current
Undervoltage Lockout Threshold
FB Input Bias Current
Off-Time Adjustment Range
V_IN = 5.5V, V_LX = 5.5V or 0
V_CC falling, 100mV hysteresis
FBSEL = GND, adjustable output mode, V_FB = 1.2V
-20
4.0
-50
0.55
Off-Time Default Period
0.85
SHDN Input Current
SHDN = GND or V_CC
-1
SHDN Input Low Voltage
SHDN Input High Voltage
2.2
MAX
5.5
3.366
2.550
1.110
3.8
1.110
4.75
0.1
0.1
600
10
20
4.3
50
4
1.25
1
0.8
UNITS
V
V
V
V
A
Ω
Ω
µA
µA
µA
V
nA
µs
µs
µA
V
V
Note 1: Guaranteed by design, not production tested.
Note 2: Idle Mode threshold is defined as the transition point in the load-current range between Idle Mode and constant-off-time
operation.
Note 3: Specifications to -40°C are guaranteed by design, not production tested.
_______________________________________________________________________________________ 3