MAX15050EWE+T Maxim Integrated Products, MAX15050EWE+T Datasheet - Page 9

• Manufacturer Part Number: MAX15050EWE+T
• Description: Switching Converters, Regulators & Controllers WLP 16 PIN 2.7MM egulator with Integr
• Manufacturer: Maxim Integrated Products

Specifications of MAX15050EWE+T

• Output Current: 4 A
• Input Voltage: 2.9 V to 5.5 V
• Switching Frequency: 1 MHz
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 96 %
• Package / Case: WLP-16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 1. All-Ceramic Capacitor Design with V
The MAX15050/MAX15051 high-efficiency, voltage-
mode switching regulators can deliver up to 4A of out-
put current. The MAX15050/MAX15051 provide output
voltages from 0.6V to (0.9 x V
supplies, making them ideal for on-board point-of-load
applications. The output-voltage accuracy is better than
±1% over load, line, and temperature.
The MAX15050/MAX15051 feature a 1MHz fixed switch-
ing frequency, allowing the user to achieve all-ceramic
capacitor designs and fast transient responses. The high
operating frequency minimizes the size of external com-
ponents. The MAX15050/MAX15051 are available in a
2mm x 2mm, 16-bump (4 x 4 array), 0.5mm pitch WLP
package. The REFIN/SS function makes the
MAX15050/MAX15051 ideal solutions for DDR and track-
ing power supplies. Using internal low-R
and 18mΩ) n-channel MOSFETs for the high- and low-
side switches, respectively, maintains high efficiency at
both heavy-load and high-switching frequencies.
The MAX15050/MAX15051 employ voltage-mode con-
trol architecture with a high-bandwidth (> 26MHz) error
amplifier. The op-amp voltage-error amplifier works with
with Integrated Switches in 2mm x 2mm Package
High-Efficiency, 4A, 1MHz, Step-Down Regulators
2.9V TO 5.5V
INPUT
22µF
C1
_______________________________________________________________________________________
0.1µF
2.2µF
C3
C5
Detailed Description
OFF
0.033µF
C8
IN
ON
) from 2.9V to 5.5V input
IN
IN
V
EN
REFIN/SS
DD
OUT
DS(ON)
MAX15050
MAX15051
GND
U1
= 1.8V
PWRGD
(24mΩ
COMP
GND
BST
BST
LX
LX
LX
FB
C9
0.1µF
1500pF
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 impedance
when V
is above 0.54V. PWRGD goes low when V
90% of V
The controller logic block is the central processor that
determines the duty cycle of the high-side MOSFET
under different line, load, and temperature conditions.
Under normal operation, where the current-limit and
temperature protection are not triggered, the controller
logic block takes the output from the PWM comparator
and generates the driver signals for both high-side and
low-side MOSFETs. The control logic block controls the
break-before-make logic and the timing for charging
the bootstrap capacitors. The error signal from the volt-
age-error amplifier is compared with the ramp signal
generated by the oscillator at the PWM comparator to
produce the required PWM signal. The high-side switch
turns on at the beginning of the oscillator cycle and
C11
0.82µH
L1
56pF
C12
5.62kΩ
R4
FB
20kΩ
REFIN/SS
2.2Ω
R10
R5
1000pF
exceeds 92.5% of V
71.5Ω
C10
Typical Application Circuit
R6
V
DD
or V
C15
1000pF
REFIN/SS
OPTIONAL
C2
47µF
Controller Function
is below 0.54V.
REFIN/SS
OUTPUT
1.8V/4A
C4
0.01µF
and V
FB
falls below
R3
8.06kΩ
1%
R7
4.02kΩ
1%
REFIN/SS
9