MAX8720ETX+ Maxim Integrated Products, MAX8720ETX+ Datasheet - Page 29

• Manufacturer Part Number: MAX8720ETX+
• Description: IC CNTRL VID STP DWN 36-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8720ETX+

• Applications: Controller, CPU GPU
• Voltage - Input: 2 ~ 28 V
• Number Of Outputs: 1
• Voltage - Output: 0.28 ~ 1.85 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-TQFN Exposed Pad
• Output Voltage: 0.275 V to 1.85 V
• Input Voltage: 2 V to 28 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1) Place the power components first, with ground ter-
2) Mount the controller IC adjacent to the low-side
3) Group the gate-drive components (BST diode and
minals adjacent (NL source, C
anode). If possible, make all these connections on
the top layer with wide, copper-filled areas.
MOSFET, preferably on the back side opposite NL
and NH to keep LX, GND, DH, and the DL gate-drive
lines short and wide. The DL and DH_ gate traces
must be short and wide (50 to 100 mils wide if the
MOSFET is 1in from the controller IC) to keep the dri-
ver impedance low and for proper adaptive dead-
time sensing.
capacitor, V
controller IC.
TOP VIEW
DD
______________________________________________________________________________________
bypass capacitor) together near the
PGOOD
SHDN
GNDS
TIME
ILIM
TON
FBS
V
REF
CC
V+
FB
S0
S1
CC
10
11
12
13
14
1
2
3
4
5
6
7
8
9
MAX8720EEI
QSOP
Layout Procedure
Dynamically Adjustable 6-Bit VID
IN
, C
OUT
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DH
LX
BST
D1
D2
D3
D4
D5
SKIP
D0
SUS
V
DL
GND
DD
, and DL
N.C.
TON
FBS
V
REF
CC
FB
S0
S1
CC
4) Make the DC-DC controller ground connections as
5) Connect the output power planes directly to the out-
TRANSISTOR COUNT: 7190
PROCESS: BiCMOS
1
2
3
4
5
6
7
8
9
shown in Figures 1 and 12. This diagram can be
viewed as having two separate ground planes:
power ground, where all the high-power compo-
nents go, and an analog ground plane for sensitive
analog components. The analog ground plane and
power ground plane must meet only at a single point
directly at the IC.
put filter capacitor positive and negative terminals
with multiple vias. Place the entire DC-DC converter
circuit as close to the load as is practical.
Step-Down Controller
10 11 12 13 14 15 16 17 18
36 35 34 33 32 31 30 29 28
6mm x 6mm
THIN QFN
MAX8720ETX
Pin Configurations
Chip Information
27
26
25
24
23
22
21
20
19
D1
D2
D3
D4
D5
SKIP
D0
SUS
V
DD
29