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參數(shù)資料
| 型號(hào)： | MAX1831EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3A, 1MHz, Low-Voltage, Step-Down Regulators with Synchronous Rectification and Internal Switches |
| 中文描述： | 5.1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-16 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大小： | 278K |
| 代理商： | MAX1831EEE |
M
3A, 1MHz, Low-Voltage, Step-Down Regulators with
Synchronous Rectification and Internal Switches
_______________________________________________________________________________________
7
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
OFF
). To control the current
under short-circuit conditions, the PMOS switch
remains off for approximately 4 x t
OFF
when V
OUT
<
V
OUT(NOM)
/ 4.
Idle Mode
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
V
CC
470pF
2.2
μ
F
1
μ
F
10
FBSEL
FEEDBACK
SELECTION
CURRENT
SENSE
PWM LOGIC
AND
DRIVERS
IN
FB
V
IN
3.0V TO 5.5V
V
OUT
LX
C
CERAMIC
PGND
TOFF
R
TOFF
GND
NOTE:
HEAVY LINES DENOTE HIGH-CURRENT PATHS.
REF
REF
SUMMING
COMPARATOR
REF
REF
COMP
SKIP
SHDN
TIMER
V
IN
CURRENT
SENSE
DIGITAL
SOFT-START
MAX1830
MAX1831
G
m
C
OUT
Figure 2. Functional Diagram
TOFF
COMP
V
CC
FBSEL
SHDN
IN
PGND
GND
REF
MAX1830
LX
FB
MAX1830
MAX1831
R
TOFF
1
μ
F
L
1.5
μ
F
2.2
μ
F
470pF
10
INPUT
OUTPUT
V
OUT
= 2.5V, FBSEL = V
CC
V
OUT
= 1.8V, FBSEL = REF
V
OUT
= 1.5V, FBSEL = FLOATING
MAX1831
V
OUT
= 2.5V, FBSEL = V
CC
V
OUT
= 3.3V, FBSEL = REF
V
OUT
= 1.5V, FBSEL = FLOATING
SUMIDA
CDRH-6D28
C
OUT
120
μ
F, 4V
Panasonic SP
C
IN
22
μ
F,
6.3V X5R
Figure 1. Typical Circuit
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