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參數(shù)資料
| 型號： | MAX1685EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low-Noise, 14V Input, 1A, PWM Step-Down Converters |
| 中文描述： | 2.3 A SWITCHING REGULATOR, 680 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-16 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 234K |
| 代理商： | MAX1685EEE |
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1685EEE+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 14V 1A PWM Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1685EEE+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 14V 1A PWM Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1685EEE-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 14V 1A PWM Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1685EVKIT | 功能描述:電源管理IC開發(fā)工具 Evaluation Kit for the MAX1684 MAX1685 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX1686EUA | 功能描述:電荷泵 3-5V Regulating Chrg Pump For SIM Cards RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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