Rainbow Electronics MAX1717 - Manual (Page 3)

MAX1717
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = +15V, V CC = V DD = SKP/SDN = +5V, V OUT = 1.6V, T A = 0°C to +85°C, unless otherwise noted.)
Current-Limit Threshold
(Zero Crossing)
4 mV GND - LX
DH Gate Driver On-Resistance 1.0 3.5 Ω BST - LX forced to 5V
Current-Limit Default
Switchover Threshold
3 V CC - 1 V CC - 0.4 V
T A = 0°C to +85°C 85 115
T A = +25°C to +85°C
ILIM = REF (2V)
ILIM = 0.5V
PARAMETER MIN TYP MAX UNITS
Output Undervoltage Fault
Blanking Time
256 clks
Output Undervoltage Fault
Propagation Delay
10 µs
Output Undervoltage Fault
Protection Threshold
65 70 75 %
Overvoltage Fault Propagation
Delay
10 µs
Current-Limit Threshold
(Positive, Default) 90 100 110
Current-Limit Threshold
(Positive, Adjustable) 35 50 65
mV
165 200 230
REF Sink Current
Reference Load Regulation 0.01 V
10 µA
Overvoltage Trip Threshold 2.20 2.25 2.30 V
Current-Limit Threshold
(Negative)
-140 -110 -80 mV
Thermal Shutdown Threshold 150 °C
V CC Undervoltage Lockout
Threshold
4.1 4.4 V
1.0 3.5
DL Gate Driver On-Resistance
0.4 1.0
Ω
DH Gate-Driver Source/Sink
Current
1.3 A
DL Gate-Driver Sink Current 4 A
CONDITIONS
LX - GND, ILIM = V CC
From SKP/SDN signal going high, clock speed set by R TIME
Hysteresis = 10°C
FB forced 2% below trip threshold
With respect to unloaded output voltage
FB forced 2% above trip threshold
GND - LX, ILIM = V CC
Rising edge, hysteresis = 20mV, PWM disabled below
this level
GND - LX
DL, high state (pullup)
DL, low state (pulldown)
DH forced to 2.5V, BST - LX forced to 5V
I REF = 0 to 50µA
DL forced to 2.5V
REF in regulation
Measured at FB
mV
VGATE Lower Trip Threshold -8 -6.5 -5 %
Measured at FB with respect to unloaded output voltage,
rising edge, hysteresis = 1%
VGATE Upper Trip Threshold +10 +12 +14 %
Measured at FB with respect to unloaded output voltage,
rising edge, hysteresis = 1%
VGATE Propagation Delay 10 µs FB forced 2% outside VGATE trip threshold
VGATE Output Low Voltage 0.4 V I SINK = 1mA
VGATE Transition Delay 1 clk After X = Y, clock speed set by R TIME
VGATE Leakage Current 1 µA High state, forced to 5.5V
GATE DRIVERS
FAULT PROTECTION