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参数资料
| 型号： | MAX16907RAUE/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 16TSSOP |
| 标准包装： | 2,500 |
| 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： | 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： | * |
MAX16907
36V, 2.2MHz Step-Down Converter
with Low Operating Current
f zMOD =
= GAIN MOD(DC) ×
f pMOD
GAIN MOD(fC)
GAIN MOD(fC) ×
× g m,EA C =
V FB
R C =
C C =
f dpEA =
C F =
f zEA =
f pEA =
= GAIN MOD(DC) ×
f pMOD
GAIN MOD(fC)
GAIN EA(fC) m,EA C × zMOD
= g
× R
The output capacitor and its ESR also introduce a zero at:
1
2 π × ESR × C OUT
When C OUT is composed of “n” identical capacitors
in parallel, the resulting C OUT = n x C OUT(EACH) and
ESR = ESR (EACH) /n. Note that the capacitor zero for a
parallel combination of alike capacitors is the same as
for an individual capacitor.
The feedback voltage-divider has a gain of GAIN FB =
V FB /V OUT , where V FB is 1V (typ).
The transconductance error amplifier has a DC gain of
GAIN EA(DC) = g m,EA x R OUT,EA , where g m,EA is the error-
amplifier transconductance, which is 900 F S (typ), and
R OUT,EA is the output resistance of the error amplifier.
A dominant pole (f dpEA ) is set by the compensa-
tion capacitor (C C ) and the amplifier output resistance
(R OUT,EA ). A zero (f zEA ) is set by the compensation
resistor (R C ) and the compensation capacitor (C C ).
There is an optional pole (f pEA ) set by C F and R C to
cancel the output capacitor ESR zero if it occurs near
the crossover frequency (f C , where the loop gain equals
1 (0dB)). Thus:
1
2 π × C C × (R OUT,EA + R C )
1
2 π × C C × R C
1
2 π × C F × R C
The loop-gain crossover frequency (f C ) should be set
below 1/5th of the switching frequency and much higher
than the power-modulator pole (f pMOD ):
f C
Therefore:
× R 1
V OUT
Solving for R C :
V OUT
g m,EA × V FB × GAIN MOD(fC)
Set the error-amplifier compensation zero formed by R C
and C C (f zEA ) at the f pMOD . Calculate the value of C C
as follows:
1
2 π × f pMOD × R C
If f zMOD is less than 5 x f C , add a second capacitor,
C F , from COMP to GND and set the compensation pole
formed by R C and C F (f pEA ) at the f zMOD . Calculate the
value of C F as follows:
1
2 π × f zMOD × R C
As the load current decreases, the modulator pole also
decreases; however, the modulator gain increases accord-
ingly and the crossover frequency remains the same.
For the case where f zMOD is less than f C :
The power-modulator gain at f C is:
f zMOD
The error-amplifier gain at f C is:
f
f C
f pMOD << f C ≤ SW
× g m,EA C × =
f zMOD
f
5
The total loop gain as the product of the modulator gain,
the feedback voltage-divider gain, and the error-amplifier
Therefore:
GAIN MOD(fC) ×
V FB
V OUT
× R 1
f C
GAIN MOD(fC) ×
× GAIN EA(fC) =
V FB
R C =
gain at f C should be equal to 1. So:
1
V OUT
For the case where f zMOD is greater than f C :
GAIN EA(fC) = g m,EA × R C
Maxim Integrated
Solving for R C :
V OUT × f C
g m,EA × V FB × GAIN MOD(fC) × f zMOD
Set the error-amplifier compensation zero formed by R C
and C C at the f pMOD (f zEA = f pMOD ) as follows:
15
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| MAX16907SATE/V+T | IC REG BUCK SYNC ADJ 3A 16TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16907SATE/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 |
| MAX16907SATE/V+T | 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 |
| MAX16907SATE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX16907SATE+T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| MAX16907SAUE/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 |
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