MAX8720 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8720 Datasheet PDF : 31 Pages
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Dynamically Adjustable 6-Bit VID
Step-Down Controller
PIN
28 QSOP
36 THIN
QFN
13
11
14
12
15
—
16
16, 17
17
19
18
20
19
21
20
22
21
23
22
24
23
25
24
26
25
27
26
29
27
31
28
32
—
13
—
14,15
—
6, 18, 28,
30, 36
Pin Description (continued)
NAME
FUNCTION
GNDS
PGOOD
GND
DL
VDD
SUS
D0
SKIP
D5
D4
D3
D2
D1
BST
Ground Remote-Sense Input. For nonvoltage-positioned circuits, connect GNDS to
ground directly at the load. GNDS internally connects to the integrator that fine tunes the
output voltage. The output voltage rises by an amount of GNDS - AGND. For voltage-
positioned circuits, increase the output voltage by biasing GNDS with a resistor-divider
from REF to AGND.
Open-Drain Power-Good Output. PGOOD is normally high when the output is in
regulation. If VFB is not within a ±15% window of the DAC setting, PGOOD is asserted
low. During DAC code transitions, PGOOD is forced high for an additional 8 clocks after
the slew-rate controller finishes the transition. PGOOD is low during shutdown. PGOOD
upper threshold is blanked whenever the MAX8720 is in pulse-skipping mode (SKIP =
GND or SUS = high).
Analog and Power Ground. Also connects to the current-limit comparator.
Low-Side Gate-Driver Output. DL swings from PGND to VDD.
Supply Voltage Input for the DL Gate Driver. Connect to the system supply voltage
(+4.5V to +5.5V). Bypass VDD to power ground with a 1µF or greater ceramic capacitor.
Suspend-Mode Control Input. When SUS is high, the suspend-mode VID code, as
programmed by S0 and S1, is delivered to the DAC. Connect SUS to GND if the suspend-
mode multiplexer is not used. PGOOD upper threshold is blanked when SUS is high.
DAC Code Inputs. D0 is the LSB and D5 is the MSB for the 6-bit DAC.
Pulse-Skipping Control Input. Connect SKIP to VCC for low-noise, forced-PWM mode, or
connect SKIP to GND to enable pulse-skipping operation. PGOOD upper threshold is
blanked when SKIP = GND.
DAC Code Inputs. D0 is the LSB and D5 is the MSB for the 6-bit DAC.
Boost Flying-Capacitor Connection. Connect to an external capacitor and diode as
shown in Figure 1. An optional resistor in series with BST allows the DH pullup current to
be adjusted.
LX
DH
AGND
PGND
Inductor Connection. Connect LX to the switched side of the inductor. LX serves as the
lower supply rail for the DH high-side gate driver. It also connects to the current-limit
comparator and the skip-mode zero-crossing comparator.
High-Side Gate-Driver Output. DH swings from LX to BST.
Analog Ground. Connect the backside pad to AGND.
Power Ground. Also connects to the current-limit comparator.
N.C. Not internally connected.
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