MAX8686
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
INA
= 12V, VL = AVL, V
REFIN
= 1V, V
RS+
- V
RS-
= 1V, V
RS-
= 0V, V
EN/SLOPE
= 1.25V, V
CS+
= V
CS-
= 1V, R
ILIM
= 122kΩ, C
VL
= 1μF,
C
AVL
= 0.22μF, C
FREQ
= 270pF, T
A
= +25°C, unless otherwise noted.) (Note 2)
Note 2: Specifications to T
A
= -40°C are guaranteed by design and not production tested.
PARAMETER CONDITIONS MIN TYP MAX UNITS
OSCILLATOR (FREQ)
Source Current V
FREQ
= 2V, T
A
= -40°C to +85°C
480
500
520
μA
C
FREQ
= 180pF 0.8 1 1.2 MHz
Switching Frequency
C
FREQ
= 580pF 240 300 360 kHz
Minimum On-Time 100 ns
FREQ Discharge Resistance 10 50 Ω
Ramp Peak Voltage 2.60 V
AVL
/2 2.85 V
SLOPE COMPENSATION (EN/SLOPE)
V
SLOPE
Range 1.25 2.50 V
SLOPE Source Current 81012μA
THERMAL PROTECTION
Thermal Shutdown Rising temperature 160 °C
Thermal-Shutdown Hysteresis 30 °C
POWER-OK (POK)
V
OUT
rising 87 90 93
POK Threshold
V
OUT
falling 87
%V
OUT
POK Output Voltage Low V
RS+
-
V
RS-
= 0.8V, I
POK
= 2mA 25 200 mV
POK Leakage Current V
POK
= 5.5V 0.001 1 μA
OVERVOLTAGE OUTPUT PROTECTION (OVP)
Overvoltage Fault Trip Level
V
REFIN
= 3.3V, V
RS+
rising, percentage of V
OUT
in
regulation
115 120 125 %
ENABLE (EN/SLOPE)
EN Logic-High 1.2 V
EN Logic-Low 0.7 V
BST
Internal PMOS On-Resistance 8 Ω
