Rainbow Electronics MAX8720 - Manual (Page 2)

MAX8720
Dynamically Adjustable 6-Bit VID
Step-Down Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V CC to AGND............................................................-0.3V to +6V
V DD to PGND............................................................-0.3V to +6V
AGND to PGND .....................................................-0.3V to +0.3V
V+ to PGND............................................................-0.3V to +30V
SHDN to AGND ......................................................-0.3V to +16V
D0–D5, PGOOD, SUS, SKIP to AGND .....................-0.3V to +6V
FB, FBS, GNDS to AGND ...........................-0.3V to (V
CC + 0.3V)
CC, ILIM, REF, TIME to AGND ...................-0.3V to (V CC + 0.3V)
S0, S1, TON to AGND ................................-0.3V to (V CC + 0.3V)
BST to PGND..........................................................-0.3V to +36V
LX to BST..................................................................-6V to +0.3V
DH to LX .....................................................-0.3V to (BST + 0.3V)
DL to PGND................................................-0.3V to (V
DD + 0.3V)
REF Short Circuit to AGND.........................................Continuous
Continuous Power Dissipation (T
A = +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW
36-Pin TQFN (derate 26.3mW/°C above +70°C) .....2105mW
Operating Temperature
Extended Temperature Range .......................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(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
PWM CONTROLLER
Battery voltage, V+ 2 28
Input Voltage Range
V CC , V DD 4.5 5.5
V
DAC codes from
0.9V to 1.85V
-1 +1 %
DAC codes from
0.45V to 0.875V
-10 +10 DC Output Voltage Accuracy
V+ = 4.5V to 28V,
includes load
regulation error
DAC codes from
0.275V to 0.425V
-18 +18
mV
Line Regulation Error V CC = 4.5V to 5.5V, V+ = 4.5V to 28V 5 mV
Remote-Sense Voltage Error FB to FBS or AGND to GNDS = 0 to 25mV 3 mV
FBS Input Bias Current FB, FBS -0.2 +0.2 µA
GNDS Input Bias Current GNDS -1 +1 µA
FB Input Resistance 115 180 265 k Ω
150kHz, R TIME = 120k Ω -8 +8
818kHz, R TIME = 22k Ω -12 +12 TIME Frequency Accuracy
38kHz, R TIME = 470k Ω -12 +12
%
V+ = 5V, FB = 1.25V, TON = GND
(1000kHz)
230 260 290
TON = REF
(550kHz)
165 190 215
TON = open
(300kHz)
320 355 390
On-Time (Note 2) t
ON
V+ = 12V,
FB = 1.25V
TON = V CC
(200kHz)
465 515 565
ns
Note 1: For the MAX8720EEI, AGND and PGND refer to a single pin designated GND.