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参数资料
| 型号： | MAX16909RATE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V/ADJ 3A 16TQFN |
| 标准包装： | 60 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，1 V ~ 10 V |
| 输入电压： | 3.5 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 220kHz ~ 1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 包装： | * |
| 供应商设备封装： | * |
MAX16909
36V, 220kHz to 1MHz Step-Down Converter
with Low Operating Current
? ? V OUT ?
? ? ? V FB ?
Skip Mode/Standby Mode
During light-load operation the device enters skip mode
operation. Skip mode turns off the majority of circuitry
and allows the output to drop below regulation voltage
before the switch is turned on again. The lower the load
current, the longer it takes for the regulator to initiate
a new cycle. Because the converter skips unneces-
sary cycles and turns off the majority of circuitry, the
converter efficiency increases. When the high-side FET
stops switching for more than 50 F s, most of the internal
circuitry, including LDO, draws power from V OUT (V OUT
= 3V to 5.5V), allowing current consumption from the bat-
tery to drop to only 30 F A.
Overtemperature Protection
Thermal-overload protection limits the total power dis-
sipation in the device. When the junction temperature
exceeds +175 N C (typ), an internal thermal sensor
shuts down the internal bias regulator and the step-
V OUT
down converter, allowing the IC to cool. The thermal
sensor turns on the IC again after the junction tempera-
ture cools by 15 N C.
Applications Information
Setting the Output Voltage
Connect FB to BIAS for a fixed 5V output voltage. To set
the output to other voltages between 1V and 10V, con-
nect a resistive divider from output (OUT) to FB to GND
following equation:
?
R FB1
= R FB2 ? ? ? ? 1 ?
? ?
where V FB = 1V (see the Electrical Characteristics table).
Internal Oscillator
The switching frequency, f SW , is set by a resistor (R FOSC )
connected from FOSC to GND. See Figure 2 to select the
correct R FOSC value for the desired switching frequency.
For example, a 400kHz switching frequency is set with
MAX16909
FB
R FB1
R FB2
R FOSC = 65k I . 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
Figure 1. Adjustable Output-Voltage Setting
operation with the device: inductance value (L), inductor
saturation current (I SAT ), and DC resistance (R DCR ). To
select inductance value, the ratio of inductor peak-to-
1.0
0.9
0.8
0.7
0.6
SWITCHING FREQUENCY vs. R FOSC
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 frequency, input voltage,
output voltage, and selected LIR then determine the
inductor value as follows:
L = OUT SUP OUT
0.5
0.4
0.3
0.2
0.1
0
20
V IN = 14V
30 40
50
60
70
80
90 100 110
V (V ? V )
V SUP f SW I OUT LIR
where V SUP , V OUT , and I OUT are typical values (so that
efficiency is optimum for typical conditions). The switch-
ing frequency is set by R FOSC (see the Internal Oscillator
section). The exact inductor value is not critical and can
R FOSC (k I )
Figure 2. Switching Frequency vs. R FOSC
Maxim Integrated
be adjusted to make trade-offs among size, cost, efficien-
cy, and transient response requirements. Table 1 shows
a comparison between small and large inductor sizes.
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16909RAUE/V+ | 功能描述:直流/直流开关转换器 36V 220kHz to 1MHz Step-Down RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX16909RAUE/V+T | 功能描述:直流/直流开关转换器 36V 220kHz to 1MHz Step-Down RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX16909RAUE+ | 制造商:Maxim Integrated Products 功能描述:36V, 220KHZ TO 1MHZ STEP-DOWN CONVERTER WITH LOW OPERATING C - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC REG BUCK 5V/ADJ 3A 16TSSOP 制造商:Maxim Integrated Products 功能描述:36V 220kHz-1MHz Step-Down Converter |
| MAX16909RAUE+CFZ | 制造商:Maxim Integrated Products 功能描述:36V, 220KHZ TO 1MHZ STEP-DOWN CONVERTER WITH LOW OPERATING C - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC REG BUCK 5V/ADJ 3A 28-TQFN |
| MAX16909RAUE+T | 制造商:Maxim Integrated Products 功能描述:36V, 220KHZ TO 1MHZ STEP-DOWN CONVERTER WITH LOW OPERATING C - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC REG BUCK 5V/ADJ 3A 16TSSOP 制造商:Maxim Integrated Products 功能描述:36V 220kHz-1MHz Step-Down Converter |
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