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参数资料
| 型号： | MAX1652EEE |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
| 中文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, 0.025 INCH PITCH, QSOP-16 |
| 文件页数： | 17/28页 |
| 文件大小： | 265K |
| 代理商： | MAX1652EEE |
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M
High-Effic ienc y, PWM, S tep-Down
DC-DC Controllers in 16-Pin QS OP
______________________________________________________________________________________
17
flow, and thereby suppresses discontinuous-mode
inductor ringing by changing the reverse current-limit
detection threshold from 0 to -100mV, allowing the
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.
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
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 Feedbac k
(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-
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.
Duty-Fac tor Limitations for
Low V
OUT
/V
IN
Ratios
The MAX1652/MAX1653/MAX1654’s output voltage is
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.
MAX1652
MAX1653
MAX1654
MAX1655
CSL
CSH
GND
FB
R4
R5
MAIN
OUTPUT
REMOTE
SENSE
LINES
DH
DL
V
OUT
WHERE V
REF
(NOMINAL) = 2.5V (MAX1652–MAX1654)
= 1.0V (MAX1655)
= V
REF
(
1 + R5
)
V+
Figure 6. Adjusting the Main Output Voltage
SHDN
SKIP
LOAD
CURRENT
MODE
NAME
DESCRIPTION
Low
X
X
Shutdown
All circuit blocks
turned off; supply
current = 3μA typ
High
Low
Low,
<10%
Idle
Pulse-skipping;
supply current =
300μA typ at V
IN
=
10V; discontinuous
inductor current
High
Low
Medium,
<30%
Idle
Pulse-skipping;
continuous inductor
current
High
Low
High,
>30%
PWM
Constant-frequency
PWM; continuous
inductor current
High
High
X
Low Noise*
(PWM)
Constant-frequency
PWM regardless of
load; continuous
inductor current
even at no load
Table 3. Operating-Mode Truth Table
*MAX1652/MAX1654 have no SKIP pin and therefore can’t go
into low-noise mode.
X = Don’t care
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1653 | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
| MAX1654 | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
| MAX1655 | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
| MAX1655EEE | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
| MAX1653EEE | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1652EEE+ | 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 |
| MAX1652EEE+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 |
| MAX1652EEE-T | 功能描述:DC/DC 开关控制器 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 | 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+ | 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 |
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