Electrical characteristics (continued) – Rainbow Electronics MAX833 User Manual
Page 3
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
=
×
+ Ω
Ω
.
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
V
Reference Voltage
V
REF
(nominal = 2.21V) (MAX830)
T
A
= +25°C
1.5
V
C
Voltage
0% duty cycle
-4
4.85
5.00
5.15
V
V
3.20
3.30
3.40
µ
A
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
%/V
Output Voltage Line Regulation
3.0
5.0
8.0
V
SHUT
= 0.1V (shutdown)
50
k
Ω
µA
2.5
4.2
7.0
SENSE 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
±1.5
T
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