Electrical characteristics (continued) – Rainbow Electronics MAX1717 User Manual
Page 5
MAX1717
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = +15V, V
CC
= V
DD
= SKP/SDN = +5V, V
OUT
=1.6V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 3)
VGATE Lower Trip Threshold
-8.4
-4.6
%
VGATE Upper Trip Threshold
+10
+15
%
Measured at FB with respect to unloaded output voltage,
falling edge, hysteresis = 1%
Measured at FB with respect to unloaded output voltage,
rising edge, hysteresis = 1%
ILIM = REF (2V)
ILIM = 0.5V
DAC B-Mode Programming
Resistor, Low
1
k
Ω
DAC B-Mode Programming
Resistor, High
100
k
Ω
Output Undervoltage Protection
Threshold
65
75
%
Current-Limit Threshold
(Positive, Default)
80
115
mV
Current-Limit Threshold
(Positive, Adjustable)
33
65
mV
160
240
Overvoltage Trip Threshold
2.20
2.30
V
Current-Limit Threshold
(Negative)
-140
-80
mV
V
CC
Undervoltage Lockout
Threshold
D0–D4, 0 to 0.4V or 2.6V to 5.5V applied through resistor,
A/B = GND
4.1
4.4
V
DH Gate Driver On-Resistance
D0–D4, 0 to 0.4V or 2.6V to 5.5V applied through resistor,
A/B = GND
3.5
Ω
DL Gate Driver On-Resistance
3.5
Ω
1.0
Ω
Logic Input High Voltage
2.4
V
Logic Input Low Voltage
0.8
V
LX - GND, ILIM = V
CC
With respect to unloaded output voltage
GND - LX, ILIM = V
CC
Rising edge, hysteresis = 20mV, PWM disabled below this
level
BST - LX forced to 5V
GND - LX
DL, high state (pullup)
DL, low state (pulldown)
Measured at FB
D0–D4, A/B
D0–D4, A/B
PARAMETER
MIN
TYP
MAX
UNITS
Quiescent Supply Current (V
CC
)
1200
µA
Shutdown Battery Supply
Current (V+)
5
µA
Reference Voltage
1.98
2.02
V
CONDITIONS
Measured at V
CC
, FB forced above the regulation point
SKP/SDN = 0, V
CC
= V
DD
= 0 or 5V
V
CC
= 4.5V to 5.5V, no REF load
Note 1: Output voltage accuracy specifications apply to DAC voltages from 0.925V to 2V. Includes load-regulation error.
Note 2: On-Time specifications are measured from 50% to 50% at the DH pin, with LX forced to 0, BST forced to 5V, and a 500pF
capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times may be different due to
MOSFET switching speeds.
Note 3: Specifications to -40°C are guaranteed by design and not production tested.
Shutdown Supply Current (V
CC
)
5
µA
Shutdown Supply Current (V
DD
)
5
µA
SKP/SDN = 0
SKP/SDN = 0
Quiescent Battery Supply
Current (V+)
40
µA
Quiescent Supply Current (V
DD
)
5
µA
Measured at V
DD
, FB forced above the regulation point