Electrical characteristics (continued) – Rainbow Electronics MAX17409 User Manual
Page 6
MAX17409
1-Phase Quick-PWM GPU Controller
6
_______________________________________________________________________________________
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
FAULT PROTECTION
Skip mode after output reaches the
regulation voltage or PWM mode;
measured at FB with respect to unloaded
output voltage
250 350
mV
Output Overvoltage-Protection
Threshold
V
OVP
Soft-start, soft-shutdown, skip mode, and
output have not reached the regulation
voltage, measured at FB
1.45 1.55 V
Output Undervoltage-Protection
Threshold
V
UVP
Measured at FB with respect to unloaded
output voltage
-450 -350
mV
PWRGD Startup Delay
Measured at startup from the time when
SHDN goes high
3 8
ms
Lower threshold, falling
edge (undervoltage)
-350 -250
mV
PWRGD Threshold
Measured at FB
with respect to
unloaded output
voltage; 15mV
hysteresis (typ)
Upper threshold, rising
edge (overvoltage)
+150 +250
mV
PWRGD Output Low Voltage
I
SINK
= 3mA
0.4
V
V
CC
Undervoltage-Lockout
Threshold
V
UVLO(VCC)
Rising edge, 50mV typical hysteresis,
controller disabled below this level
4.0 4.5 V
THERMAL COMPARATOR AND PROTECTION
VRHOT Trip Threshold
Measured at THRM with respect to V
CC
;
falling edge; typical hysteresis = 100mV
29.2 30.8 %
VRHOT Output On-Resistance
R
VRHOT
Low state
8
VALLEY CURRENT LIMIT AND DROOP
V
REF
- V
ILIM
= 100mV
7
13
Current-Limit Threshold Voltage
(Positive Adjustable)
V
LIMIT
V
CSP
- V
CSN
V
REF
- V
ILIM
= 500mV
45
55
mV
Current-Limit Threshold Voltage
(Positive Default)
ILIM
=
V
CC
, V
CSP
- V
CSN
20
25
mV
Current-Limit Threshold Voltage
(Negative) Accuracy
V
LIMIT(NEG)
V
CSP
- V
CSN
, nominally -125% of V
LIMIT
-5 +5
mV
CSP, CSN Common-Mode
Input Range
0
1.9
V
Droop Amplifier GMD) Offset
(V
CSP
- V
CSN
) at I
FB
= 0
-1.0
+1.0
mV
Droop Amplifier (GMD)
Transconductance
I
FB
/
(V
CSP
- V
CSN
);
FB = CSN = 0.45V to 2.0V,
and (V
CSP
- V
CSN
) = -15.0mV to +15.0mV
588
612
µS