MAX15112EVKIT# Maxim Integrated, MAX15112EVKIT# Datasheet - Page 20

• Manufacturer Part Number: MAX15112EVKIT#
• Description: Power Management IC Development Tools MAX15112 Eval Kit
• Manufacturer: Maxim Integrated
• Type: Power Switchesr
• Series: MAX15112r

Specifications of MAX15112EVKIT#

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: MAX15112
• Input Voltage: 2.7 V to 5.5 V
• Output Voltage: 0.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Output Current: 12 A
• For Use With: MAX15112

3) Select C
Optionally, for low duty-cycle applications, the addition
of a phase-leading capacitor (C
gate the phase lag of the damped half-frequency double
pole. Adding a second zero near to but below the desired
crossover frequency increases both the closed-loop
phase margin and the regulator’s unity-gain bandwidth
(crossover frequency). Select the capacitor as follows:
Using C
The soft-start feature ramps up the output voltage slowly,
reducing input inrush current during startup. Size the C
capacitor to achieve the desired soft-start time, t
Table 1. Suggested Component Values (see the
V
first system zero, f
margin. Typically, setting f
vides sufficient phase margin.
OUT
0.8
1.2
1.5
1.8
1.8
2.5
2.5
3.3
High-Efficiency, 12A, Current-Mode Synchronous
FF
(V)
Step-Down Regulator with Integrated Switches
, the zero-pole order is adjusted as follows:
C
<
. C
1/ 2 C
f
P1
C
L (µH)
C


0.18
0.22
0.22
0.22
0.36
0.22
0.36
0.36
FF
<
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is determined by selecting the desired
π
f
C
P2
=
C
C
FF
2
SS
Setting the Soft-Start Time
Z1
<
≥
π ×
(
f
R || R2
2 f
, based on the desired phase
Z1
=
π
f
1
(V
CO
I
LIR (A/A)
SS
<
IN
CO
1/ 2 C R
V
0.28
0.29
0.31
0.31
0.23
Z1
5
×
= 3.3V)
—
—
—
1
×
FB
FF
)
(R1 || R2)
×
[


t
below 1/5th of f
SS
R
<
π
in
C
f
P3
Figure
FF 1
<
f
]
Z2
(V
LIR (A/A)
IN
2) helps miti-
0.31
0.35
0.40
0.27
0.29
0.26
—
—
= 5V)
SS
CO
, using:
pro-
SS
C15 (pF)
3300
3300
3300
3300
3300
3300
3300
3300
I
0.6V (typ) output feedback voltage threshold. When
using large C
current limit can trigger during the soft-start period. To
ensure the correct soft-start time, t
enough to satisfy:
An external tracking reference with steady-state value
between 0V and (V
In this case, connect an RC network from the external
track ing reference and SS/REFIN, as shown in
The recommended value for R
R
SS/REFIN can be pulled down internally.
Figure 4. RC Network for External Reference at SS/REFIN
Table 1
typical operating circuit.
SS
SS
, the soft-start current, is 10FA (typ) and V
Typical Operating
is needed to ensure that, during hiccup period,
V
REF_EXT
R3 (kI)
provides values for various outputs based on the
5.23
5.23
5.23
5.23
5.23
5.23
5.23
5.23
C
SS
OUT
>>
R
SS
C
IN
C14 (pF)
OUT
capacitance values, the high-side
C
- 2.5V) can be applied to SS/REFIN.
SS
22
22
22
22
22
22
22
22
×
(18A - I
Circuits)
SS
V
OUT
SS/REFIN
MAX15112
LOAD
R1 (kI)
is approximately 330I.
Design Examples
SS
0.74
2.21
3.32
4.42
4.42
6.98
6.98
9.95
×
, choose C
MAX15112
I
SS
) V
×
FB
R2 (kI)
FB
Figure
2.21
2.21
2.21
2.21
2.21
2.21
2.21
2.21
SS
is the
large
4.