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参数资料
| 型号： | MAX16977SATE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC BUCK SYNC ADJ 2A 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： | 1MHz ~ 2.2MHz |
| 电流 - 输出： | 2A |
| 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： | * |
MAX16977
36V, 2A, 2.2MHz Step-Down Converter
with Low Operating Current
Skip Mode/Standby Mode
During light-load operation, I INDUCTOR P 185mA, 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 con-
verter skips unnecessary 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 (for V OUT = 3V to 5.5V), allowing current consump-
tion from the battery to drop to only 30 F A.
Spread Spectrum
The IC has an internal speread-spectrum option to
optimize EMI performance. This is factory set and the
S-version of the IC should be ordered. For spread-spec-
trum-enabled ICs, the operating frequency is varied ± 6%
V OUT
up from the base 2.2MHz frequency. The modulation sig-
nal is a triangular wave with a period of 400 μ s. Therefore,
fOSC ramps up 6% in 200 μ s and then ramps down 6%
and back to 2.2MHz in 200 μ s. The cycle repeats. The
400 μ s modulation period is fixed for other fOSC frequen-
cy. The internal spread spectrum is disabled if the IC is
synced to an external clock. However, the IC accepts an
external spread-spectrum clock.
Overtemperature Protection
Thermal-overload protection limits the total power dissipa-
tion 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-down converter, allow-
ing the IC to cool. The thermal sensor turns on the IC again
after the junction temperature 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-
MAX16977
FB
R FB1
nect a resistive divider from output (OUT) to FB to GND
following equation:
? ? V OUT ?
? ? ? V FB ?
R FB2
Figure 1. Adjustable Output-Voltage Setting
SWITCHING FREQUENCY vs. R FOSC
3.0
2.5
2.0
1.5
1.0
?
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 2.2MHz switching frequency is set with
R FOSC = 12k 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
0.5
V IN = 14V
I LOAD = 1.5A
Three key inductor parameters must be specified for
operation with the device: inductance value (L), inductor
0
12
15
18
21
24
saturation current (I SAT ), and DC resistance (R DCR ). To
select inductance value, the ratio of inductor peak-to-
R FOSC (k I )
Figure 2. Switching Frequency vs. R FOSC
Maxim Integrated
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
12
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相关代理商/技术参数 |
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|---|---|
| MAX16977SAUE/V+ | 功能描述:直流/直流开关转换器 36V 2.2MHz Step Down Converter 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 |
| MAX16977SAUE/V+T | 功能描述:直流/直流开关转换器 36V 2A 2.2MHz Step-Down Converter 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 |
| MAX16977SAUE+ | 制造商:Maxim Integrated Products 功能描述:36V, 2A, 2.2MHZ STEP-DOWN CONVERTER WITH LOW OPERATING CURRE - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC REG BUCK SYNC 5V/ADJ 16TSSOP |
| MAX16977SAUE+T | 制造商:Maxim Integrated Products 功能描述:36V, 2A, 2.2MHZ STEP-DOWN CONVERTER WITH LOW OPERATING CURRE - Tape and Reel |
| MAX1697REUT | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
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