Rainbow Electronics MAX8720 - Manual (Page 3)

MAX8720
Dynamically Adjustable 6-Bit VID
Step-Down Controller
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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.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TON = V CC , open, or REF (200kHz, 300kHz,
or 550kHz)
400 500
Minimum Off-Time (Note 2) t OFF(MIN)
TON = GND (1000kHz) 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 %
PGOOD Propagation Delay 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 V