AMD 2-/3-Output Mobile Serial
VID Controller
MAX1780
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, V = 12V, V
= V
= V
= V
= V
= 5V, V
= 1.8V, V
= V
= V
= V
,
PGND
IN
CC
DD
IN3
SHDN
PGD_IN
DDIO
OPTION
GNDS_
AGND
V
FBDC
_ = V
= V
= V
= V
= 1.2V, all DAC codes set to the 1.2V code, T = 0°C to +85°C, unless otherwise noted.
CSN_ A
FBAC_
OUT3
CSP_
Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
FAULT DETECTION
PWM mode
250
300
350
mV
Skip mode and output
has not reached the
regulation voltage
Output Overvoltage Trip
Threshold
(SMPS1 and SMPS2 Only)
Measured at
FBDC_, rising
edge
1.80
1.85
1.90
V
OVP_
V
Minimum OVP
threshold
0.8
10
Output Overvoltage Fault
Propagation Delay (SMPS1 and
SMPS2 only)
t
FBDC_ forced 25mV above trip threshold
µs
OVP
Output Undervoltage Protection
Trip Threshold
Measured at FBDC_ or OUT3 with respect
to unloaded output voltage
V
-450
-400
10
-350
mV
µs
UVP
Output Undervoltage Fault
Propagation Delay
t
FBDC_ forced 25mV below trip threshold
UVP
Lower threshold,
falling edge
(undervoltage)
Measured at
-350
-300
-250
FBDC_ or OUT3
with respect to
unloaded output
voltage,15mV
hysteresis (typ)
PWRGD Threshold
mV
Upper threshold,
rising edge
(overvoltage)
+150
+200
10
+250
FBDC_ or OUT3 forced 25mV outside the
PWRGD trip thresholds
PWRGD Propagation Delay
PWRGD, Output Low Voltage
PWRGD Leakage Current
t
I
µs
V
PWRGD
PWRGD
I
= 4mA
0.4
1
SINK
High state, PWRGD forced to 5.5V, T
+25°C
=
A
µA
PWRGD Startup Delay and
Transition Blanking Time
Measured from the time when FBDC_ and
OUT3 reach the target voltage
t
20
30
10
µs
%
BLANK
Measured at THRM, with respect to V
falling edge, 115mV hysteresis (typ)
,
CC
VRHOT Trip Threshold
VRHOT Delay
29.5
-100
30.5
THRM forced 25mV below the VRHOT trip
threshold, falling edge
t
µS
VRHOT
VRHOT, Output Low Voltage
VRHOT Leakage Current
THRM Input Leakage
I
= 4mA
0.4
1
V
SINK
High state, VRHOT forced to 5V, T = +25°C
µA
nA
°C
A
T
A
= +25°C
+100
Thermal-Shutdown Threshold
GATE DRIVERS
T
Hysteresis = 15°C
+160
SHDN
High state (pullup)
0.9
0.7
2.5
2.5
2.0
0.6
BST_ - LX_ forced
to 5V (Note 4)
DH_ Gate-Driver On-Resistance
DL_ Gate-Driver On-Resistance
R
R
_
ꢀ
ꢀ
ON(DH )
Low state (pulldown)
DL_, high state
DL_, low state
0.7
_
ON(DL )
0.25
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