MAX1831EEE+T Maxim Integrated Products, MAX1831EEE+T Datasheet - Page 7

• Manufacturer Part Number: MAX1831EEE+T
• Description: IC REG STEP DOWN 3A 16-QSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1831EEE+T

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.5V, 2.5V, 3.3V, Adj
• Current - Output: 3A
• Frequency - Switching: 1MHz
• Voltage - Input: 3 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Power - Output: 1.12W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 1. Typical Circuit
Figure 2. Functional Diagram
lation comparator turns the PMOS switch on at the end
of each off-time, keeping the device in continuous-con-
duction mode. The PMOS switch remains on until the
output is in regulation or the current limit is reached.
When the PMOS switch turns off, it remains off for the
programmed off-time (t
under short-circuit conditions, the PMOS switch
remains off for approximately 4 x t
V
3A, 1MHz, Low-Voltage, Step-Down Regulators with
OUT(NOM)
Synchronous Rectification and Internal Switches
/ 4.
V
IN
NOTE: HEAVY LINES DENOTE HIGH-CURRENT PATHS.
10Ω
470pF
2.2µF
_______________________________________________________________________________________
2.2µF
1µF
10Ω
COMP
SHDN
INPUT
V
REF
OFF
CC
6.3V X5R
470pF
REF
R
). To control the current
22µF,
TOFF
C
IN
G
m
OFF
REF
IN
V
SHDN
COMP
TOFF
GND
REF
CC
MAX1830
MAX1831
when V
SELECTION
FEEDBACK
FBSEL
PGND
GND
FBSEL
REF
FB
LX
OUT
CDRH-6D28
SUMIDA
COMPARATOR
<
1.5µF
L
SUMMING
MAX1830
MAX1831
TIMER
1µF
TOFF
R
Under light loads, the devices improve efficiency by
switching to a pulse-skipping Idle Mode. Idle Mode
operation occurs when the current through the PMOS
switch is less than the Idle Mode threshold current. Idle
Mode forces the PMOS to remain on until the current
through the switch reaches the Idle Mode threshold,
thus minimizing the unnecessary switching that
degrades efficiency under light loads. In Idle Mode, the
TOFF
V
V
V
OUT
OUT
OUT
PWM LOGIC
= 2.5V, FBSEL = V
= 1.8V, FBSEL = REF
= 1.5V, FBSEL = FLOATING
CURRENT
CURRENT
C
120µF, 4V
Panasonic SP
DRIVERS
SENSE
SENSE
MAX1830
OUTPUT
OUT
AND
SKIP
SOFT-START
DIGITAL
PGND
CC
IN
LX
FB
V
V
V
OUT
OUT
OUT
= 2.5V, FBSEL = V
= 3.3V, FBSEL = REF
= 1.5V, FBSEL = FLOATING
MAX1831
C
CERAMIC
IN
C
OUT
CC
V
3.0V TO 5.5V
IN
V
OUT
Idle Mode
7