MAX15038EVKIT+ Maxim Integrated Products, MAX15038EVKIT+ Datasheet - Page 11

• Manufacturer Part Number: MAX15038EVKIT+
• Description: EVALUATION KIT FOR MAX15038
• Manufacturer: Maxim Integrated Products

Specifications of MAX15038EVKIT+

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.8V
• Current - Output: 4A
• Voltage - Input: 2.9 ~ 5.5V
• Regulator Topology: Buck
• Frequency - Switching: 1MHz
• Board Type: Fully Populated
• Utilized Ic / Part: MAX15038
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 1. 1MHz, All-Ceramic-Capacitor Design with V
The MAX15038 high-efficiency, voltage-mode switching
regulator delivers up to 4A of output current. The
MAX15038 provides output voltages from 0.6V to 0.9 x
V
on-board point-of-load applications. The output voltage
accuracy is better than ±1% over load, line, and tem-
perature.
The MAX15038 features a wide switching frequency
range, allowing the user to achieve all-ceramic-capaci-
tor designs and fast transient responses (see Figure 1).
The high operating frequency minimizes the size of
external components. The MAX15038 is available in a
small (4mm x 4mm), lead-free, 24-pin thin QFN pack-
age. The REFIN function makes the MAX15038 an ideal
candidate for DDR and tracking power supplies. Using
internal low-R
IN
from 2.9V to 5.5V input supplies, making it ideal for
2.9V TO 5.5V
INPUT
22μF
DS(ON)
C6
______________________________________________________________________________________
0.1μF
(24mΩ for the low-side n-channel
Detailed Description
C7
49.9kΩ
R4
2.2μF
C5
C4
0.022μF
4A, 2MHz Step-Down Regulator
IN
IN
V
CTL2
CTL1
EN
FREQ
REFIN
SS
MODE
DD
= 2.9V to 5.5V and V
MAX15038
GND
with Integrated Switches
PWRGD
COMP
PGND
MOSFET and 31mΩ for the high-side n-channel
MOSFET) maintains high efficiency at both heavy-load
and high-switching frequencies.
The MAX15038 employs voltage-mode control architec-
ture with a high bandwidth (28MHz) error amplifier. The
voltage-mode control architecture allows up to 2MHz
switching frequency, reducing board area. The op-amp
voltage-error amplifier works with type III compensation
to fully utilize the bandwidth of the high-frequency
switching to obtain fast transient response. Adjustable
soft-start time provides flexibilities to minimize input
startup inrush current. An open-drain, power-good
(PWRGD) output goes high when V
V
The MAX15038 provides option for three modes of oper-
ation: regular PWM, PWM mode with monotonic startup
into prebiased output, or skip mode with monotonic
startup into prebiased output.
OUT
BST
LX
REFIN
FB
OUT
and V
1500pF
C10
0.1μF
C2
= 1.8V
33pF
C1
REFIN
Typical Application Circuit
2.67kΩ
R2
0.47μH
L1
is greater than 0.54V.
560pF
158Ω
C3
R3
2.2Ω
V
R1
20kΩ
DD
C15
1000pF
C8
22μF
FB
reaches 92.5% of
OPTIONAL
OUTPUT
1.8V, 4A
C9
0.01μF
11