- 您现在的位置：买卖IC网 > PDF目录15147 > MAX16955AUE/V+T (Maxim Integrated Products)IC REG CTRLR BUCK PWM CM 16TSSOP PDF资料下载
参数资料
| 型号： | MAX16955AUE/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16TSSOP |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 3.5 V ~ 36 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 ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX16955
36V, 1MHz Step-Down Controller
with Low Operating Current
Design Procedure
Effective Input Voltage Range
Although the MAX16955 controller can operate from
input supplies up to 42V and regulate down to 1V, the
minimum voltage conversion ratio (V OUT /V SUP ) might
be limited by the minimum controllable on-time. For
proper fixed-frequency PWM operation, the voltage
conversion ratio should obey the following condition:
FB
OUT
R FB1
R FB2
V OUT
V SUP
> t ON ( MIN ) × f SW
MAX16955
where t ON(MIN) is 80ns and f SW is the switching fre-
quency in Hz. If the desired voltage conversion does
not meet the above condition, then pulse skipping
occurs to decrease the effective duty cycle. To avoid
this, decrease the switching frequency or lower the
input voltage (V SUP ).
Setting the Output Voltage
Figure 2. Adjustable Output Voltage
R FB 1 = R FB 2 ? ? OUT ? ? 1 ?
Connect FB to BIAS to enable the fixed step-down con-
troller output voltage (5V), set by a preset, internal
resistive voltage-divider connected between the output
(OUT) and SGND.
To achieve other output voltages between 1V to 10V,
connect a resistive divider from OUT to FB to SGND
(Figure 2). Select R FB2 (FB to SGND resistor) less than
or equal to 100k Ω . Calculate R FB1 (OUT to FB resistor)
with the following equation:
? ?
? ? V ? ?
? ? V FB ? ?
where V FB = 1V (typ) (see the Electrical Characteristics
table) and V OUT can range from 1V to 10V.
1200
1150
1100
1050
1000
950
900
850
800
750
700
650
600
550
500
450
400
350
300
250
200
SWITCHING FREQUENCY vs. R FOSC
25 35 45 55 65 75 85 95 105 115 125 135 145
Setting the Switching Frequency
The switching frequency, f SW , is set by a resistor
(R FOSC ) connected from FOSC to SGND. See Figure 3
to select the correct R FOSC value for the desired
switching frequency.
For example, a 400kHz switching frequency is set with
R FOSC = 76.8k Ω . Higher frequencies allow designs with
lower inductor values and less output capacitance.
Consequently, peak currents and I 2 R losses are lower
at higher switching frequencies, but core losses, gate-
charge currents, and switching losses increase.
Inductor Selection
Three key inductor parameters must be specified for
operation with the MAX16955: inductance value (L),
inductor saturation current (I SAT ), and DC resistance
(R DCR ). To select inductance value, the ratio of inductor
16
R FOSC (k I )
Figure 3. Switching Frequency vs. R FOSC
peak-to-peak AC current to DC average current (LIR)
must be selected first. A good compromise between
size and loss is a 30% peak-to-peak ripple current to
average-current ratio (LIR = 0.3). The switching fre-
quency, input voltage, output voltage, and selected LIR
then determine the inductor value as follows:
L = V OUT ( V SUP ( MIN ) ? V OUT )
V SUP ( MIN ) × f SW × I OUT ( MA X ) × LIR
where V SUP(MIN) is the minimum supply voltage, V OUT is
the typical output voltage, and I OUT(MAX) is the maximum
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1771CSA+T | IC REG CTRLR BST PWM 8-SOIC |
| ISL88013IH526Z-TK | IC VOLTAGE MONITOR DUAL SOT23-5 |
| ISL88013IH523Z-TK | IC VOLTAGE MONITOR DUAL SOT23-5 |
| MAX15046BAEE+T | IC REG CTRLR BUCK PWM VM 16-QSOP |
| VI-20V-EY-B1 | CONVERTER MOD DC/DC 5.8V 50W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16955EVKIT# | 功能描述:电源管理IC开发工具 MAX16955 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX16955EVKIT+ | 功能描述:电源管理IC开发工具 MAX16955 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX16956AUBA/V+T | 制造商:Maxim Integrated Products 功能描述:36V, 300MA, MINI BUCK CONVERTER WITH 2UA IQ - Tape and Reel |
| MAX16958GEE/V+ | 功能描述:模数转换器 - ADC 500mA Hi-Speed USB Protector RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX16958GEE/V+T | 功能描述:模数转换器 - ADC 500mA Hi-Speed USB Protector RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
发布紧急采购，3分钟左右您将得到回复。