Rainbow Electronics MAX17409 - Manual (Page 7)

MAX17409
1-Phase Quick-PWM GPU Controller
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ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V IN = 12V, V DD = V CC = 5V, SHDN = ILIM = V CC , SKIP = GNDS = PGND = GND, V FB = V CSP = V CSN = 1.05V;
G5–G0 set for 1.05V (G0–G5 = 100110); T A = -40 °C to +105°C, unless otherwise specified.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GATE DRIVERS
High state (pullup) 2.5
DH Gate-Driver On-Resistance R ON(DH)
BST - LX forced
to 5V
Low state (pulldown) 2.0
High state (pullup) 2.0
DL Gate-Driver On-Resistance R ON(DL)
Low state (pulldown) 0.7
Internal BST Switch
On-Resistance
R
BST I BST = 10mA, V DD = 5V 20
CURRENT MONITOR
Current-Monitor Transconductance G m(IMON)
I
IMON / (V
CSP - V CSN ) V CSN = 0.5V to 1.0V 4.9 5.1 mS
Current-Monitor Offset Referred
to V(CSP,CSN)
I IMON = 0 -1.0 +1.0 mV
IMON Clamp Voltage V
IMON
I
IMON
= -1.0mA 1.05 1.15 V
LOGIC AND I/O
Logic-Input High Voltage V IH
SHDN, SKIP 2.3 V
Logic-Input Low Voltage V IL
SHDN, SKIP 1.0 V
Low-Voltage Logic-Input
High Voltage
V IHLV G0–G5 0.67 V
Low-Voltage Logic-Input
Low Voltage
V ILLV G0–G5 0.33 V
Note 3: Limits are 100% production tested at T A = +25°C. Maximum and minimum limits over temperature are guaranteed by design
and characterization.
Note 4: The equation for the target voltage V TARGET is:
V TARGET = the slew-rate-controlled version of V DAC , where V DAC = 0 for shutdown, V DAC = V VID otherwise (the V VID volt-
ages for all possible VID codes are given in Table 4).
In pulse-skipping mode, the output rises by approximately 1.5% when transitioning from continuous conduction to no load.
Note 5: On-time and minimum off-time specifications are measured from 50% to 50% at the DH pin, with LX forced to 0V, BST forced
to 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.