- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384653 > MAX1684 (Maxim Integrated Products, Inc.) Low-Noise, 14V Input, 1A, PWM Step-Down Converters PDF資料下載
參數(shù)資料
| 型號： | MAX1684 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Noise, 14V Input, 1A, PWM Step-Down Converters |
| 中文描述： | 低噪聲、14V輸入、1A、PWM降壓型轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 234K |
| 代理商： | MAX1684 |
M
Low-Noise, 14V Input, 1A, PWM
S tep-Down Converters
8
_______________________________________________________________________________________
_______________Detailed Desc ription
The MAX1684/MAX1685 step-down, pulse-width-modu-
lation (PWM) DC-DC converters provide an adjustable
output from 1.25V to the input voltage. They accept
inputs from 2.7V to 14V and deliver up to 1.6A. An inter-
nal MOSFET and synchronous rectifier reduce PC
board area while maintaining high efficiency. Operation
with up to 100% duty cycle minimizes dropout voltage.
Fixed-frequency PWM operation reduces interference
in sensitive communications and data-acquisition appli-
cations. A SYNC input allows synchronization to an
external clock. The MAX1684/MAX1685 can operate in
five modes. Setting the devices to operate in the appro-
priate mode for the intended application (Table 1)
achieves highest efficiency.
PWM Control
The MAX1684/MAX1685 use an oscillator-triggered min-
imum/maximum on-time current-mode control scheme
(Figure 2). The minimum on-time is typically 220ns
unless the regulator is in dropout. The maximum on-time
is 2 / f
OSC
, allowing operation to 100% duty cycle.
Current-mode feedback provides cycle-by-cycle current
limiting for superior load- and line-transient response.
At each falling edge of the internal oscillator, the inter-
nal P-channel MOSFET (main switch) turns on. This
allows current to ramp up through the inductor to the
load and stores energy in a magnetic field. The switch
remains on until either the current-limit comparator
trips, the maximum on-time expires, or the PWM com-
parator signals that the output is in regulation. When
the switch turns off during the second half of each
cycle, the inductor’s magnetic field collapses, releasing
the stored energy and forcing current through the out-
put diode to the output filter capacitor and load. The
output filter capacitor stores charge when the inductor
current is high and releases it when the inductor cur-
rent is low, smoothing the voltage across the load.
During normal operation, the MAX1684/MAX1685 regu-
late the output voltage by switching at a constant fre-
quency and modulating the power transferred to the
load on each cycle using the PWM comparator. A multi-
input comparator sums three weighted differential sig-
nals (the output voltage with respect to the reference,
the main switch current sense, and the slope-compen-
sation ramp) and changes states when a threshold is
reached. It modulates output power by adjusting the
MAX1685
LX
13, 14
L
10
μ
H*
MBRS
130LT3
16
5
12
7
IN
CVH
AIN
PGND
AGND
OUTPUT
3.3V AT 1A
*SUMIDA
CD54-100;
USE 22
μ
H FOR MAX1684
INPUT
14V MAX
BOOT
FB
SHDN
CVL
4
15
2
3
1
11
1
μ
F
0.1
μ
F
0.1
μ
F
22
μ
F
C
OUT
100
μ
F
0.1
μ
F
(OPTIONAL)
0.1
μ
F
0.01
μ
F
ON/OFF
9
STBY
SYNC/PWM
ILIM/SS
CC
6
8
10
REF
Figure 1. Standard Application Circuit
Table 1. Operating Modes
Fixed-Frequency PWM
H
PWM
MODE
FUNCTION
SYNC/PWM
H
STBY
H
SHDN
1.6A
TYPICAL
OUTPUT
CAPABILITY
H
H
1.6A
Fixed-Input Clock-Frequency PWM
Clocked
Sync PWM
H
H
1.6A
PFM at light loads (<150mA). Fixed-
frequency PWM at heavy loads (>150mA).
L
Normal
L
H
160mA
Low-Power or Standby Mode.
X
Low Power
X
L
0
Circuit Disabled
X
Shutdown
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1685 | Low-Noise, 14V Input, 1A, PWM Step-Down Converters |
| MAX1685EEE | Low-Noise, 14V Input, 1A, PWM Step-Down Converters |
| MAX1687ESA | Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM |
| MAX1688ESA | Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM |
| MAX1686 | Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX16840ATB+ | 制造商:Maxim Integrated Products 功能描述:LED DRIVER WITH INTEGRATED MOSFET FOR MR 制造商:Maxim Integrated Products 功能描述:LED DRIVER WITH INTEGRATED MOSFET FOR MR16 AND OTHER 12V AC - Rail/Tube |
| MAX16840ATB+T | 功能描述:LED照明驅(qū)動器 w/Integrated MOSFET for MR16 & Other RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX16840ATE+ | 功能描述:LED照明驅(qū)動器 MR16 LED Driver w/Int MOSFET RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX16840ATE+T | 功能描述:LED照明驅(qū)動器 MR16 LED Driver w/Int MOSFET RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX16840EVKIT# | 功能描述:LED 照明開發(fā)工具 MAX16840 Eval Kit RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。