MAX15051EWE+T Maxim Integrated Products, MAX15051EWE+T Datasheet - Page 7

• Manufacturer Part Number: MAX15051EWE+T
• Description: Switching Converters, Regulators & Controllers 4A DC/DC CONVTR egulator with Integr
• Manufacturer: Maxim Integrated Products

Specifications of MAX15051EWE+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

with Integrated Switches in 2mm x 2mm Package
(V
IN
B1, B2,
High-Efficiency, 4A, 1MHz, Step-Down Regulators
A1, A2
A3, A4
C2, C3
BUMP
100
-20
-40
80
60
40
20
C1
C4
D1
D2
D3
D4
= 5V, output voltage = 1.8V, I
B3
B4
0
-40
I
LOAD
vs. AMBIENT TEMPERATURE
= 4A
-15
REFIN/SS
PWRGD
COMP
NAME
CASE TEMPERATURE
AMBIENT TEMPERATURE (°C)
GND
V
BST
I.C.
EN
LX
FB
IN
DD
10
_______________________________________________________________________________________
Analog/Power Ground. Connect GND to the PCB ground plane at one point near the input bypass
capacitor return terminal as close as possible to the device.
Power-Supply Input. Input supply range is from 2.9V to 5.5V. Bypass IN to GND with a 22µF ceramic
capacitor in parallel to a 0.1µF ceramic capacitor as close as possible to the device.
Inductor Connection. All LX bumps are internally connected together. Connect all LX bumps to the
switched side of the inductor. LX is high impedance when the device is in shutdown mode.
3.3V LDO Output. V
minimum value of 2.2µF from V
High-Side MOSFET Driver Supply. Connect BST to LX with a 0.1µF capacitor.
Internally Connected. Leave unconnected or connect to ground.
Enable Input. Connect EN to GND to disable the device. Connect EN to IN to enable the device.
Power-Good Output. PWRGD is an open-drain output that goes high impedance when V
of V
V
mode, V
Feedback Input. Connect FB to the center tap of an external resistor-divider from the output to GND to set
the output voltage from 0.6V to 90% of V
Voltage-Error Amplifier Output. Connect the necessary compensation network from COMP to FB and the
converter output (see the Compensation Design section). COMP is internally pulled to GND when the
device is in shutdown mode.
External Reference Input/Soft-Start Timing Capacitor Connection. Connect REFIN/SS to a system voltage to
force FB to regulate to REFIN/SS voltage. REFIN/SS is internally pulled to GND when the device is in
shutdown and thermal shutdown mode. If no external reference is applied, the internal 0.6V reference is
automatically selected. REFIN/SS is also used to perform soft-start. Connect a minimum of 1nF capacitor
from REFIN/SS to GND to set the startup time (see the Soft-Start and Reference Input (REFIN/SS) section).
REFIN/SS
35
REFIN/SS
60
DD
LOAD
or V
is below the internal UVLO threshold, or the device is in thermal shutdown.
and V
REFIN/SS
= 4A, and T
85
REFIN/SS
DD
powers the internal analog core. Connect a low-ESR, ceramic capacitor with a
is below 0.54V. PWRGD is internally pulled low when the device is in shutdown
Typical Operating Characteristics (continued)
TRANSITION FROM SKIP MODE
A
is above 0.54V. PWRGD is internally pulled low when V
= +25°C, circuit of Figure 1, unless otherwise noted.)
TO FORCED PWM
DD
to GND.
10ms/div
IN
.
MAX15050 toc19
FUNCTION
I
2A/div
V
5V/div
V
500mV/div
OUT
LX
OUT
TRANSITION FROM FORCED PWM
TO SKIP MODE
10ms/div
Pin Description
FB
falls below 90% of
FB
exceeds 92.5%
MAX15050 toc20
I
2A/div
V
5V/div
V
500mV/div
OUT
LX
OUT
7