MAX830–MAX833
5V/3.3V/3V/Adjustable-Output, 1A,
Step-Down, PWM, Switch-Mode DC-DC Regulators
_______________________________________________________________________________________ 3
MAX830–MAX833
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 25V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
Note 2: For switch currents between 0.2A and 1A, maximum switch-on voltage can be calculated via linear interpolation.
Note 3: By setting the SENSE pin to 5.5V (or the FB pin to 2.5V), the V
C
pin is forced to its low clamp level and the switch duty cycle
is forced to zero, approximating the zero load condition.
Note 4: Device shut down. Switch leakage current not included.
Note 5: For proper regulation, total voltage from V
IN
to GND must be ≥ 8V after start-up. During start-up mode, device is switching
but not regulating.
Note 6: To avoid extremely short switch-on times, the switch frequency is internally scaled down when V
FB
or V
SENSE
is less than
1.3V. Switch current limit is tested with V
SENSE
or V
FB
adjusted to give a 1µs minimum switch-on time.
Note 7:
Note 8: All conditions of input voltage, output voltage, temperature, and load current.
Note 9: FB is at the reference voltage when the MAX830 output voltage is in regulation.
R
I
1A
7.6k 1k
LIM
LIM
=×
+ΩΩ .
PARAMETER CONDITIONS
V
C
Voltage Temperature Coefficient
MAX831
MAX832
MIN TYP MAX UNIT
MAX833
0% duty cycle
MAX831
MAX832
MAX833
T
A
= +25°C
mV/°C
FB Bias Current 0.5 2.0
VReference Voltage
V
REF
(nominal = 2.21V) (MAX830)
T
A
= +25°C 1.5V
C
Voltage
0% duty cycle -4
4.85 5.00 5.15
V
V
3.20 3.30 3.40
µA
V
SHUT
= 5V
SENSE Voltage
10 20
V
C
= 2V
2.90 3.00 3.10
8V ≤ V
IN
≤ 30V
SHUT Current
0.005 0.020 %/VOutput Voltage Line Regulation
3.0 5.0 8.0
V
SHUT
= 0.1V (shutdown) 50
kΩ
µA
2.5 4.2 7.0SENSE Divider Resistance T
A
= +25°C
2.2 3.8 6.5
(shutdown) 0.10 0.20 0.50
%SENSE Voltage Tolerance (Note 8)
V
OUT
(nominal) = 5V (MAX831),
3.3V (MAX832), or 3V (MAX833)
±0.5 ±2.0
2.155 2.21 2.265
SHUT Threshold V
%
Reference Voltage Tolerance
(Notes 8, 9)
±0.5 ±1.5T
A
= +25°C
V
FB
= V
REF
(MAX830)
V
C
= 2V (MAX830) (Note 9)
±1.0 ±2.5
Typical value only. Minimum to maximum deviation in current limit will be ±30%,
comparable to that with I
LIM
pin open.
±0.5 ±3.0
(11 Seiten)
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