- 您现在的位置：买卖IC网 > PDF目录15040 > MAX1653EEE (Maxim Integrated Products)IC REG CTRLR BUCK PWM CM 16-QSOP PDF资料下载
参数资料
| 型号： | MAX1653EEE |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| PWM 型： | 电流模式，混合 |
| 输出数： | 1 |
| 频率 - 最大： | 350kHz |
| 占空比： | 98% |
| 电源电压： | 4.5 V ~ 30 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页当前第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
High-Efficiency, PWM, Step-Down
DC-DC Controllers in 16-Pin QSOP
Table 3. Operating-Mode Truth Table
LOAD MODE
SHDN SKIP DESCRIPTION
CURRENT NAME
All circuit blocks
Low X X Shutdown turned off; supply
current = 3μA typ
Pulse-skipping;
supply current =
Low,
High Low Idle 300μA typ at V IN =
<10%
10V; discontinuous
inductor current
Pulse-skipping;
Medium,
High Low Idle continuous inductor
<30%
current
Constant-frequency
High,
High Low PWM PWM; continuous
>30%
inductor current
put. Adjusting the main output voltage with external
resistors is easy for any of the devices in this family, via
the circuit of Figure 6. The feedback voltage is nominal-
ly 2.5 for all family members except the MAX1655,
which has a nominal FB voltage of 1V. The output volt-
age (given by the formula in Figure 6) should be set
approximately 2% high in order to make up for the
MAX1652 ’s load-regulation error. For example, if
designing for a 3.0V output, use a resistor ratio that
results in a nominal output voltage of 3.06V. This slight
offsetting gives the best possible accuracy.
Recommended normal values for R5 range from 5k ? to
100k ? .
Remote sensing of the output voltage, while not possi-
ble in fixed-output mode due to the combined nature of
the voltage- and current-sense input (CSL), is easy to
achieve in adjustable mode by using the top of the
external resistor divider as the remote sense point.
High
High
X
Low Noise*
(PWM)
Constant-frequency
PWM regardless of
load; continuous
inductor current
Duty-Factor Limitations for
Low V OUT /V IN Ratios
The MAX1652/MAX1653/MAX1654’s output voltage is
even at no load
* MAX1652/MAX1654 have no SKIP pin and therefore can’t go
into low-noise mode.
X = Don’t care
flow, and thereby suppresses discontinuous-mode
inductor ringing by changing the reverse current-limit
detection threshold from 0 to -100mV, allowing the
adjustable down to 2.5V and the MAX1655’s output is
adjustable as low as 1V. However, the minimum duty
factor may limit the choice of operating frequency, high
input voltage, and low output voltage.
inductor current to reverse at very light loads.
In most applications, SKIP should be tied to GND in
order to minimize quiescent supply current. Supply cur-
rent with SKIP high is typically 10mA to 20mA, depend-
ing on external MOSFET gate capacitance and
switching losses.
MAX1652
MAX1653
MAX1654
DH
DL
V+
REMOTE
SENSE
LINES
MAIN
OUTPUT
Forced continuous conduction via SKIP can improve
cross regulation of transformer-coupled multiple-output
supplies. This second function of the SKIP pin produces
a result that is similar to the method of adding sec-
ondary regulation via the SECFB feedback pin, but with
much higher quiescent supply current. Still, improving
cross regulation by enabling SKIP instead of building in
MAX1655
GND
CSH
CSL
FB
R5
R4
SECFB feedback can be useful in noise-sensitive appli-
(
)
cations, since SECFB and SKIP are mutually exclusive
pins/functions in the MAX1652 family.
Adjustable-Output Feedback
(Dual-Mode FB Pin)
The MAX1652 –MAX1655 family has both fixed and
adjustable output voltage modes. For fixed mode, con-
nect FB to GND for a 3.3V output and to V L for a 5V out-
R4
V OUT = V REF 1 + –––
R5
WHERE V REF (NOMINAL) = 2.5V (MAX1652–MAX1654)
= 1.0V (MAX1655)
Figure 6. Adjusting the Main Output Voltage
______________________________________________________________________________________
17
相关PDF资料 |
PDF描述 |
|---|---|
| EMM10DRMT | CONN EDGECARD 20POS .156 WW |
| ECM24DRMT | CONN EDGECARD 48POS .156 WW |
| DS1233M-3+T&R | IC ECONORESET 3V TO92-3 |
| ESRD151M04XR | CAP ALUM 150UF 4V 20% SMD |
| UVY0J223MHD | CAP ALUM 22000UF 6.3V 20% RADIAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1653EEE+ | 功能描述:DC/DC 开关控制器 PWM Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1653EEE+T | 功能描述:DC/DC 开关控制器 PWM Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1653EEE+-T | 制造商:Maxim Integrated Products 功能描述:DC DC CNTRLR SGL-OUT W/PWM/STEP DOWN 4.5V TO 30V 16QSOP - Tape and Reel |
| MAX1653EEE-T | 功能描述:DC/DC 开关控制器 PWM Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1653EEE-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
发布紧急采购，3分钟左右您将得到回复。