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參數(shù)資料
| 型號： | MAX1742EEE+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches |
| 中文描述： | 4.7 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)： | 15/16頁 |
| 文件大?。?/td> | 597K |
| 代理商： | MAX1742EEE+T |
MAX1742/MAX1842
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
8
_______________________________________________________________________________________
NAME
FUNCTION
1
SHDN
Shutdown Control Input. Drive SHDN low to disable the reference, control circuitry, and internal
MOSFETs. Drive high or connect to VCC for normal operation.
PIN
Pin Description
MAX1842
LOAD-TRANSIENT RESPONSE
VOUTPUT
50mV/div
IL
2A/div
MAX1842 toc17
10
s/div
0
MAX1842
LINE-TRANSIENT RESPONSE
VINPUT
2V/div
VOUTPUT
20mV/div
AC-COUPLED
MAX1842 toc18
20
s/div
IOUT = 2.5A, VOUT = 1.5V, RTOFF = 100k
, L = 2.2H
2, 4
IN
Supply Voltage Input—for the internal PMOS power switch.
3, 14, 16
LX
Connection for the drains of the PMOS power switch and NMOS synchronous-rectifier switch. Connect
the inductor from this node to the output filter capacitor and load.
5
SS
Soft-Start. Connect a capacitor from SS to GND to limit inrush current during startup.
6
COMP
Integrator Compensation. Connect a capacitor from COMP to VCC for integrator compensation. See
Integrator Amplifier section.
7
TOFF
Off-Time Select Input. Sets the PMOS power switch off-time during constant-off-time operation. Connect a
resistor from TOFF to GND to adjust the PMOS switch off-time.
8
FB
Feedback Input—for both preset-output and adjustable-output operating modes. Connect directly to
output for fixed-voltage operation or to a resistive divider for adjustable operating modes.
9
GND
Analog Ground
10
REF
Reference Output. Bypass REF to GND with a 1F capacitor.
11
FBSEL
Feedback Select Input. Selects output voltage. See Table 3 for programming instructions.
12
VCC
Analog Supply Voltage Input. Supplies internal analog circuitry. Bypass VCC with a 10
and 2.2F low-
pass filter. See Figure 1.
13, 15
PGND
Power Ground. Internally connected to the internal NMOS synchronous-rectifier switch.
Typical Operating Characteristics (continued)
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
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