Electrical characteristics (continued) – Rainbow Electronics MAX17031 User Manual
Page 7
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
_______________________________________________________________________________________
7
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, V
IN
= 12V, V
DD
= V
CC
= V
SKIP
= 5V, ONLDO = RTC, ON1 = ON2
= V
CC
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25
°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CURRENT LIMIT
ILIM_ Adjustment Range
0.2
2
V
R
ILIM
_ = 100k
(V
ILIM
_ = 500mV)
40 60
R
ILIM
_ = 200k
(V
ILIM
_ = 1.00V)
85 115
Valley Current-Limit Threshold
(Adjustable)
V
LIM
_
(VAL)
V
AGND
- V
LX
_
R
ILIM
_ = 400k
(V
ILIM
_ = 2.00V)
164 236
mV
GATE DRIVERS
DH_ Gate-Driver On-Resistance
R
DH
BST1 - LX1 and BST2 - LX2 forced to 5V
3.5
DL1, DL2; high state
4.5
DL_ Gate-Driver On-Resistance
R
DL
DL1, DL2; low state
1.5
INPUTS AND OUTPUTS
Upper SKIP/PWM threshold falling edge,
33mV hysteresis
1.94 2.06
SKIP Input Thresholds
Lower PWM/ultrasonic threshold
0.4
1.6
V
High (SMPS on)
2.4
ON_ Input-Logic Levels
ONLDO, ON1, ON2
Low (SMPS off)
0.8
V
Note 1: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = GND, V
BST
= 5V, and
a 500pF capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times might be different
due to MOSFET switching speeds.
Note 2: Specifications to T
A
= -40°C are guaranteed by design and not production tested.
Note 3: Specification increased by 1
Ω to account for test measurement error.
Note 4: Production tested for functionality only.