MAX8654ETX+T Maxim Integrated Products, MAX8654ETX+T Datasheet - Page 10

• Manufacturer Part Number: MAX8654ETX+T
• Description: IC REG STP DWN 12V 8A 36TQFN
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX8654ETX+T

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 11.9 V
• Current - Output: 8A
• Frequency - Switching: 250kHz ~ 1.2MHz
• Voltage - Input: 4.5 ~ 14 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-TQFN Exposed Pad
• Power - Output: 2.86W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12V, 8A 1.2MHz
Step-Down Regulator
The MAX8654 high-efficiency, voltage-mode switching
regulator is capable of delivering up to 8A of output
current. The MAX8654 provides output voltages from
0.6V to 0.85 x V
ing them ideal for on-board point-of-load applications.
The output voltage accuracy is better than ±1% over
temperature.
The MAX8654 allows for all ceramic-capacitor designs
and faster transient responses. The device is available in
a 6mm x 6mm 36-pin thin QFN-EP package. The SYN-
COUT function allows end users to operate two
MAX8654s at the same switching frequency with 180°
out-of-phase operation to minimize the input ripple cur-
rent, consequently reducing the input capacitance
requirements. The REFIN function makes the MAX8654
Figure 1. Typical Application Circuit, 3.3V, 8A, 500kHz
10
______________________________________________________________________________________
100kΩ
4.5V TO 14V
IN
INPUT
from 4.5V to 14V input supplies, mak-
10μF
1μF
75kΩ
Detailed Description
VL
10μF
2.2μF
0.022μF
0.1μF
IN
IN
VP
VL
VDL
FREQ
ILIM
REFIN
SS
EN
MAX8654
GND
SYNCOUT
PWRGD
COMP
PGND
SYNC
BST
LX
FB
an ideal candidate for DDR and tracking power supplies.
Using internal low R
high- and low-side switches maintains high efficiency at
both heavy load and high switching frequencies.
The MAX8654 uses voltage-mode control architecture
with a high-bandwidth (20MHz) error amplifier. The volt-
age-mode control architecture allows up to 1.2MHz
switching, reducing board area. The op-amp voltage
error amplifier works with type 3 compensation to fully
utilize the bandwidth of the high-frequency switching to
obtain fast transient response. Adjustable soft-start time
provides flexibility to minimize input startup inrush cur-
rent. The open-drain power-good (PWRGD) output
goes high impedance when the output reaches 90% of
its regulation point.
0.22μF
10nF
1.0μH
20kΩ
3.57kΩ
22pF
2 x 22μF
VL
DS(ON)
n-channel MOSFETs for both
4.99kΩ
1.1kΩ
OUTPUT
3.3V, 8A
100Ω
1nF