Rainbow-electronics MAX17031 Bedienungsanleitung PDF herunterladen (Seite 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

= 12V, V

= V

SKIP

= 5V, ONLDO = RTC, ON1 = ON2

= V

, T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CURRENT LIMIT

ILIM_ Adjustment Range 0.2 2 V

ILIM

_ = 100k

ILIM

_ = 500mV)

40 60

ILIM

_ = 200k

ILIM

_ = 1.00V)

85 115

Valley Current-Limit Threshold

(Adjustable)

LIM

(VAL)

AGND

- V

ILIM

_ = 400k

ILIM

_ = 2.00V)

164 236

GATE DRIVERS

DH_ Gate-Driver On-Resistance R

BST1 - LX1 and BST2 - LX2 forced to 5V 3.5 

DL1, DL2; high state 4.5

DL_ Gate-Driver On-Resistance R

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

High (SMPS on) 2.4

ON_ Input-Logic Levels ONLDO, ON1, ON2

Low (SMPS off) 0.8

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

= -40°C are guaranteed by design and not production tested.

Note 3: Specification increased by 1Ω to account for test measurement error.

Note 4: Production tested for functionality only.

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MAX17031 1

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