Rainbow Electronics MAX1541 - Manual (Page 8)

MAX1540/MAX1541
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
8 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(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
Shutdown Supply Current (V CC ) ON1 = ON2 = LDOON = GND 5 µA
Shutdown Supply Current
(V
DD , MAX1541 Only)
ON1 = ON2 = LDOON = GND 5 µA
MAX1540: ON1 = ON2 = LDOON = GND,
V+ = 28V, V
CC = 0 or 5V
15
Shutdown Supply Current (V+)
MAX1541: ON1 = ON2 = LDOON = GND,
V+ = 28V, V
CC = V DD = 0 or 5V
5
µA
Shutdown Supply Current
(LDOIN, MAX1541 Only)
LDOON = GND 10 µA
PWM CONTROLLERS
FB1 = GND 1.773 1.827
V
OUT1
Preset output,
V+ = 5.5V to 28V,
SKIP = V
CC
FB1 = V CC 1.182 1.218 MAX1540 Main Output-Voltage
Accuracy (OUT1) (Note 2)
V FB1
Adjustable output, V+ = 5.5V to 28V,
SKIP = V
CC
0.689 0.711
V
FB2 = GND 2.462 2.538
V OUT2
Preset output,
V+ = 5.5V to 28V,
SKIP = V
CC
FB2 = V CC 1.477 1.523
MAX1540 Secondary Output-
Voltage Accuracy (OUT2)
(Note 2)
V FB2
Adjustable output, V+ = 5.5V to 28V,
SKIP = V
CC
0.689 0.711
V
REFIN1 = 0.35 x REF 0.689 0.711 MAX1541 Main Feedback
Voltage Accuracy (FB1)
V
FB1
V+ = 4.5V to 28V,
SKIP = V
CC REFIN1 = REF 1.97 2.03
V
FB2 = GND 2.462 2.538
V OUT2
Preset output,
V+ = 4.5V to 28V,
SKIP = V
CC
FB2 = V CC 1.773 1.827
MAX1541 Secondary Output-
Voltage Accuracy (OUT2)
(Note 2)
V
FB2
Adjustable output, V+ = 4.5V to 28V,
SKIP = V
CC
0.689 0.711
V
TON = G N D ( 620kH z) 149 190
TON = RE F ( 485kH z) 191 242
TON = op en ( 345kH z) 274 335
DH1 On-Time (Note 3) t ON1
V+ = 15V,
V
OUT1 = 1.5V
TON = V CC ( 235kH z) 402 491
ns
TON = G N D ( 460kH z) 201 256
TON = RE F ( 355kH z) 260 331
TON = op en ( 255kH z) 371 453
DH2 On-Time (Note 3) t ON2
V+ = 15V,
V
OUT2 = 1.5V
TON = V CC ( 170kH z) 556 679
ns
On-Time Tracking t ON2 with respect to t ON1 (Note 3) 118 152 %
Minimum Off-Time t OFF(MIN) (Note 3) 500 ns
LINEAR REGULATOR (LDO) (Note 1)
0 < I LDOOUT < 10mA 4.85 5.10 MAX1540 LDO Output-Voltage
Accuracy
V LDOOUT
ON1 = ON2 = GND,
V+ = 6V to 28V
0 < I L D OOU T < 100m A 4.65 5.10
V