User Manual

MAX1540/MAX1541
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
_______________________________________________________________________________________ 7
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, V
CC
= V
DD
= ON1 = ON2 = 5V, SKIP = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
High
V
CC
-
0.4V
Open 3.15 3.85
REF 1.65 2.35
Four-Level Input Logic Levels
TON, OVP/UVP,
LSAT, SKIP,
FBLANK
Low 0.5
V
Four-Level Logic Input Current
TON, OVP/UVP, LSAT, SKIP, FBLANK
forced to GND or V
CC
-3 +3 µA
ELECTRICAL CHARACTERISTICS
(V+ = 15V, V
CC
= V
DD
= ON1 = ON2 = 5V, SKIP = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN MAX UNITS
INPUT SUPPLIES (Note 1)
MAX1540: battery voltage, V+ > V
LDOOUT
5.5 28
V
IN
MAX1541: battery voltage, V+ > V
LDOOUT
228
V
BIAS
V
CC,
V
DD
(MAX1541) 4.5 5.5Input Voltage Range
V
LDOIN
MAX1541: LDO input supply,
V
LDOIN
> V
LDOOUT
4.5 28
V
FB1 and FB2 forced above the regulation
point, LSAT = GND
1.5
Quiescent Supply Current (V
CC
)I
CC
FB1 and FB2 forced above the regulation
point, ON1 or ON2 = V
CC
, V
LSAT
> 0.5V
1.8
mA
Quiescent Supply Current
(V
DD
, MAX1541 Only)
I
DD
FB1 and FB2 forced above the regulation
point, ON1 or ON2 = V
CC
5µA
MAX1540: FB1 and FB2 forced above the
regulation point, ON1 or ON2 = V
CC
,
V
LDOON
= V+ = 28V
150
Quiescent Supply Current (V+) I
V+
MAX1541: ON1 or ON2 = V
CC
, V
LDOON
=
V+ = 28V
40
µA
Quiescent Supply Current
(LDOIN, MAX1541 Only)
I
LDOIN
FB1 and FB2 forced above the regulation
point, ON1 or ON2 = V
CC
,
V
LDOON
= V+ = 28V
110 µA
Standby Supply Current (V
DD
) ON1 = ON2 = GND, V
LDOON
= V+ = 28V 5 µA
Standby Supply Current
(V
DD
, MAX1541 Only)
ON1 = ON2 = GND, V
LDOON
= V+ = 28V 5 µA
MAX1540: ON1 = ON2 = GND, LDOON =
V+ = 28V, V
CC
= 0 or 5V
105
Standby Supply Current (V+)
MAX1541: ON1 = ON2 = GND, LDOON =
V+ = 28V, V
CC
= V
DD
= 0 or 5V
5
µA
Standby Supply Current
(LDOIN, MAX1541 Only)
ON1 = ON2 = GND, V
LDOON
= V+ = 28V 100 µA