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| 型号： | MAX1685EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V/ADJ 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，1.25 V ~ 14 V |
| 输入电压： | 2.7 V ~ 14 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
synchronization to an external clock. The
0.1 μ F
MAX1684/MAX1685 can operate in five modes. Setting
the devices to operate in the appropriate mode for the
intended application (Table 1) achieves highest effi-
INPUT
14V MAX
3
IN
1
CVH
LX
13, 14
L
10 μ H*
OUTPUT
3.3V AT 1A
ciency.
PWM Control
22 μ F
2
AIN
MBRS
130LT3
C OUT
100 μ F
The MAX1684/MAX1685 use an oscillator-triggered min-
imum/maximum on-time current-mode control scheme
ON/OFF
1 μ F
0.1 μ F
15
SHDN
4 CVL
11
STBY
MAX1685 PGND
AGND
BOOT
16
5
12
(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.
9 SYNC/PWM
FB
7
At each falling edge of the internal oscillator, the inter-
nal P-channel MOSFET (main switch) turns on. This
ILIM/SS
10
0.1 μ F
(OPTIONAL)
CC REF
8 6
0.01 μ F
0.1 μ F
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
*SUMIDA
CD54-100;
USE 22 μ H FOR MAX1684
Figure 1. Standard Application Circuit
_______________Detailed Description
The MAX1684/MAX1685 step-down, PWM DC-DC con-
verters 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 internal MOSFET and synchro-
nous rectifier reduce PC board area while maintaining
high efficiency. Operation with up to 100% duty cycle
minimizes dropout voltage. Fixed-frequency PWM oper-
ation reduces interference in sensitive communications
and data-acquisition applications. A SYNC input allows
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
Table 1. Operating Modes
TYPICAL
MODE
SYNC/PWM
STBY
SHDN
FUNCTION
OUTPUT
CAPABILITY (A)
PWM
Sync PWM
Normal
Low Power
Shutdown
H
Clocked
L
X
X
H
H
H
L
X
H
H
H
H
L
Fixed-frequency PWM
Fixed-input clock-frequency PWM
PFM at light loads (<150mA); fixed-
frequency PWM at heavy loads (>150mA)
Low-power or standby mode
Circuit disabled
1.6
1.6
1.6
160m
0
8
_______________________________________________________________________________________
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| MAX1686EUA+ | 功能描述:电荷泵 3-5V Regulating Chrg Pump For SIM Cards RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1686EUA+T | 功能描述:电荷泵 3-5V Regulating Chrg Pump For SIM Cards RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
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