Rainbow Electronics MAX1717 - Manual (Page 4)

MAX1717
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
4 _______________________________________________________________________________________
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.)
ELECTRICAL CHARACTERISTICS
(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)
PARAMETER MIN TYP MAX UNITS
On-Time (Note 2) 375 475 ns
On-Time (Note 2)
136 173
ns 260 318
365 471
Minimum Off-Time (Note 2) 500 ns
Minimum Off-Time (Note 2)
TON = REF (550kHz)
375 ns
TON = open (300kHz)
CONDITIONS
V+ = 5V, FB = 2V, TON = GND (1000kHz)
V+ = 24V, FB = 2V
TON = V
CC
(200kHz)
TON = V CC , open, or REF (200kHz, 300kHz, or 550kHz)
TON = GND (1000kHz)
TIME Frequency Accuracy
-8 +8
-12 +12 %
-12 +12
150kHz nominal, R TIME = 120k Ω
380kHz nominal, R TIME = 47k Ω
38kHz nominal, R TIME = 470k Ω
-1.7 1.7
DC Output Voltage Accuracy
(Note 1)
-1.5 1.5
%
DAC codes from 1.3V to 2V V+ = 4.5V to 28V,
includes load
regulation error
DAC codes from 0.925V to 1.275V
PARAMETER CONDITIONS MIN TYP MAX UNITS
A 1.3 DL forced to 2.5V DL Gate-Driver Source Current
D0–D4 Pullup/Pulldown Entering B mode
Pull up
Pull down
40
8
k Ω
µA
-1 1
-1 1
D0–D4, A/B = 5V
A/B
Logic Input Current
TON Input Levels
For TON = V CC (200kHz operation)
For TON = open (300kHz operation)
For TON = REF (550kHz operation)
For TON = GND (1000kHz operation)
V CC - 0.4
3.15 3.85
1.65 2.35
0.5
V
µA -3 3 SKP/SDN, TON forced to GND or V CC SKP/SDN and TON Input Current
SKP/SDN Input Levels
SKP/SDN = logic high (SKIP mode)
SKP/SDN = open (PWM mode)
SKP/SDN = logic low (shutdown mode)
To enable no-fault mode
V
12 15
0.5
1.8 2.2
2.8 6
k Ω 95
D0–D4, 0 to 0.4V or 2.6V to 5.5V applied through resistor,
A/B = GND DAC B-Mode Programming
Resistor, High
1.05
D0–D4, 0 to 0.4V or 2.6V to 5.5V applied through resistor,
A/B = GND DAC B-Mode Programming
Resistor, Low
0.8 D0–D4, A/B Logic Input Low Voltage
2.4 D0–D4, A/B Logic Input High Voltage
26 DH rising
ns
35 DL rising
Dead Time
LOGIC AND I/O