MAX15112EVKIT# Maxim Integrated, MAX15112EVKIT# Datasheet - Page 17

• 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

The MAX15112 uses a fixed-frequency, peak current-
mode control scheme to provide easy compensation
and fast transient response. The inductor peak current
is monitored on a cycle-by-cycle basis and compared to
the COMP voltage (output of the voltage error amplifier).
The regulator’s duty cycle is modulated based on the
inductor’s peak current value. This cycle-by-cycle con-
trol of the inductor current emulates a controlled current
source. As a result, the inductor’s pole frequency is shift-
ed beyond the gain bandwidth of the regulator. System
stability is provided with the addition of a simple series
capacitor-resistor from COMP to GND. This pole-zero
combination serves to tailor the desired response of the
closed-loop system. The basic regulator loop consists of
a power modulator (composed of the regulator’s pulse-
Figure 2. Peak Current-Mode Regulator Transfer Model
R1
R2
V
*C
GAIN BANDWIDTH AND INCREASED PHASE MARGIN FOR SOME
LOW-DUTY CYCLE APPLICATIONS.
FEEDBACK
OUT
FF
DIVIDER
High-Efficiency, 12A, Current-Mode Synchronous
IS OPTIONAL, DESIGNED TO EXTEND THE REGULATOR’S
Step-Down Regulator with Integrated Switches
*C
V
FF
FB
Compensation Design Guidelines
REF
FB
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g
M
ERROR AMPLIFIER
R
OUT
R
=
OUT
10
AVEA(dB)/20
g
M
R
C
C
COMP
C
V
COMP
NOTE: THE G
INJECTED INTO THE OUTPUT LOAD, I
SUCH CAN BE USED TO SIMPLIFY/MODEL THE MODULATION/CONTROL/POWER STAGE
CIRCUITRY SHOWN WITHIN THE BOXED AREA.
C
COMPARATOR
PWM
MOD
STAGE SHOWN ABOVE MODELS THE AVERAGE CURRENT OF THE INDUCTOR, I
width modulator, compensation ramp, control circuitry,
MOSFETs, and inductor), the capacitive output filter and
load, an output feedback divider, and a voltage-loop
error amplifier with its associated compensation circuitry.
See
modulator’s transfer function with respect to V
where IL is the average inductor current, G
power modulator’s transconductance, and R
equivalent load resistance value.
COMPENSATION
g
MC
CONTROL
RAMP
LOGIC
V
COMP
Figure 2
POWER MODULATOR
V
V
OUT
G
COMP
MOD
OUT
, e.g., I
for a graphical representation. The power
L
V
=
= I
IN
V
OUT
Q
Q
OUT
I
R
L
HS
LS




LOAD
.
G
MOD
I
L
L
×
I




L
=
DCR
I
MAX15112
L
R
LOAD
×
I
C
OUT
OUTPUT FILTER
ESR
G
OUT
AND LOAD
MOD
LOAD
MOD
L
COMP
,
V
OUT
is the
is the
R
LOAD
is: