MAX15040EWE+T Maxim Integrated Products, MAX15040EWE+T Datasheet - Page 7

• Manufacturer Part Number: MAX15040EWE+T
• Description: DC/DC Switching Controllers 4A Step-Down w/Internal Switch
• Manufacturer: Maxim Integrated Products

Specifications of MAX15040EWE+T

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

(V
IN
B1, B2,
A1, A2
A3, A4
C2, C3
BUMP
High-Efficiency, 4A, Step-Down Regulator with
= V
B3
B4
C1
C4
D1
D2
D3
D4
Integrated Switches in 2mm x 2mm Package
DD
V
PWRGD
V
= 3.3V, output voltage = 1.8V, I
OUT
V
EN
REFIN/SS
PWRGD
STARTING INTO PREBIAS OUTPUT ABOVE
NAME
COMP
GND
V
BST
I.C.
EN
LX
FB
NOMINAL SETPOINT WITH NO LOAD
IN
DD
_______________________________________________________________________________________
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 2.4V to 3.6V. Bypass IN to GND with a 22µF ceramic
capacitor in parallel to a 0.1µ F 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.
Supply Input. V
ceramic capacitor from V
High-Side MOSFET Driver Supply. Bypass 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 V
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
REFIN/SS
1ms/div
DD
or V
is below the internal UVLO threshold, or the device is in thermal shutdown.
and V
REFIN/SS
DD
MAX15040 toc18
LOAD
REFIN/SS
powers the internal analog core. Connect V
is below 0.54V. PWRGD is internally pulled low when the device is in shutdown
Typical Operating Characteristics (continued)
= 4A, and T
2V/div
1V/div
0
2V/div
0
DD
is above 0.54V. PWRGD is internally pulled low when V
to GND.
A
= +25°C, circuit of Figure 1, unless otherwise noted.)
IN
.
FUNCTION
120
100
-20
-40
80
60
40
20
0
DD
-40
CASE = TOP SIDE OF DEVICE
MEASURED ON A MAX15040EVKIT
to IN with a 10Ω resistor. Connect a 1µF
vs. AMBIENT TEMPERATURE
-15
AMBIENT TEMPERATURE (°C)
CASE TEMPERATURE
DD
10
to enable the device.
Pin Description
FB
35
falls below 90% of
FB
I
OUT
60
exceeds 92.5%
= 4A
85
7