Datasheet

MAX8576–MAX8579
3V to 28V Input, Low-Cost, Hysteretic
Synchronous Step-Down Controllers
4 _______________________________________________________________________________________
Note 1: Guaranteed by design.
Note 2: This current linearly compensates for the MOSFET temperature coefficient.
Note 3: Specifications to -40
°C are guaranteed by design and not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V (MAX8576/MAX8577 only), 4.7µF capacitor from VL (MAX8576/MAX8577 only) or V
CC
(MAX8578/MAX8579 only) to GND;
V
CC
= V
EN
= 5V (MAX8578/MAX8579 only); 0.01µF capacitor from SS to GND; V
FB
= 0.65V; V
BST
= 5V; V
LX
= V
GND
= 0V; V
OCSET
=
11.5V; DH = unconnected; DL = unconnected; T
A
= -40°C to +85°C, unless otherwise noted. Note 3)
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
Rising
2.75 2.90
VL or V
CC
Undervoltage Lockout
(UVLO)
Falling
2.40 2.55
V
V
IN
= 12V 2
V
IN
= V
VL
= 5V 3.5
No switching, V
FB
= 0.65V
(MAX8576/MAX8577)
V
IN
= V
VL
= 3.3V 2
V
CC
= 5V 2
Supply Current
V
EN
= 0V or V
FB
= 0.65V, no
switching (MAX8578/MAX8579)
V
CC
= 3.3V 2
mA
REGULATOR
Output Regulation Accuracy V
FB
peak
0.591 0.607
V
Overvoltage-Protection (OVP)
Threshold
0.70 0.80
V
High-Side Current-Sense Over-
Current Trip Adjustment Range
V
IN
- V
OCSET
0.05 0.40
V
DRIVER SPECIFICATIONS
Sourcing current 4
DH Driver Resistance
Sinking current 3.0
Ω
Sourcing current 4.0
DL Driver Resistance
Sinking current 2.0
Ω
DH Minimum On-Time
245
ns
DL Minimum On-Time Normal operation
220
ns
EN
Input Voltage Low V
CC
= 3V, MAX8578/MAX8579 0.7 V
Input Voltage High V
CC
= 5.5V, MAX8578/MAX8579 1.5 V