MAX8720
Dynamically Adjustable 6-Bit VID
Step-Down Controller
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, SHDN = SKIP = V
DD
= V
CC
= +5V, V
OUT
= 1.25V, T
A
= 0°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.)
SYMBOL
MIN TYP MAX
TON = V
CC
, open, or REF (200kHz, 300kHz,
or 550kHz)
400 500
Minimum Off-Time (Note 2)
t
OFF
MIN
300 375
ns
BIAS AND REFERENCE
Quiescent Supply Current (V
CC
)I
CC
FB forced above their regulation points
700 1200
µA
Quiescent Supply Current (V
DD
)I
DD
FB forced above their regulation points <1 5 µA
Quiescent Battery Supply
Current (V+)
I
+
25 40 µA
Shutdown Supply Current (V
CC
)I
CC
SHDN = GND 10 25 µA
Shutdown Supply Current (V
DD
)I
DD
SHDN = GND <1 5 µA
Shutdown Battery Supply
Current (V+)
I
+
SHDN = GND, V
CC
= V
DD
= 0V or 5V <1 5 µA
T
A
= + 25°C to + 85°C 1.985 2.00 2.015
Reference Voltage V
REF
V
CC
= 4.5V to 5.5V,
I
REF
= 0
T
A
= 0°C to +85°C
1.98 2.00 2.02
V
Reference Load Regulation ∆V
REF
I
REF
= 0 to 50µA
0.01
V
REF Sink Current REF in regulation 10 µA
FAULT DETECTION
V
CC
Undervoltage-Lockout
Threshold
Rising edge, hysteresis = 20mV, PWM
disabled below this level
4.1 4.4 V
Output Overvoltage Trip
Threshold
2.20 2.25 2.30
V
Output Overvoltage Fault-
Propagation Delay
t
OVP
FB forced 2% above regulation 10 µs
Output Undervoltage-Protection
Trip Threshold
With respect to unloaded output voltage 65 70 75 %
Output Undervoltage Fault-
Propagation Delay
t
UVP
FB forced 2% below trip threshold 10 µs
PGOOD Transition Blanking Time
After X = Y, clock speed set by R
TIME
8 clk
PGOOD Lower Trip Threshold
Measured at FB with respect to unloaded
output voltage, hysteresis = 1%
-17 -15 -13 %
PGOOD Upper Trip Threshold
Measured at FB with respect to unloaded
output voltage, hysteresis = 1%
+13 +15 +17
t
PGOOD
Falling edge, 50mV overdrive 10 µs
PGOOD Output Low Voltage I
SINK
= 4mA 0.4 V
PGOOD Leakage Current
I
PGOOD
High state, PGOOD forced to 5.5V 1 µA
Thermal-Shutdown Threshold T
SHDN
Hysteresis = 10°C
+150
°C
CURRENT LIMIT
ILIM Adjustment Range 0.5
V
REF
(110 Seiten)
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