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参数资料
| 型号： | MAX17075ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/23页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV W/CHRG PUMP 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 4mA |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
MAX17075
Boost Regulator with Integrated Charge Pumps,
Switch Control, and High-Current Op Amp
? ? 0 .885 ?
? 5 V ? ?
13 V ? 5 V
? 13 V ? ? ? ? 0 . 5 A × 1 . 2 MHz ? ? ? ? 0 . 5 ? ?
The inductor’s saturation current rating and the
MAX17075’s LX current limit should exceed I AVDD _ PEAK ,
and the inductor’s DC current rating should exceed
I IN(DC,MAX) . For good efficiency, choose an inductor with
less than 0.1 ? series resistance.
Considering the typical operating circuit, the maximum
load current (I AVDD(MAX) ) is 500mA with a 13V output
and a typical input voltage of 5V. Choosing an LIR of 0.5
and estimating efficiency of 85% at this operating point:
2
L AVDD = ? ≈ 3 . 35 μ H
Using the circuit’s minimum input voltage (2.5V) and
estimating efficiency of 80% at that operating point:
Input-Capacitor Selection
The input capacitor (C IN ) reduces the current peaks
drawn from the input supply and reduces noise injec-
tion into the IC. Two 10μF ceramic capacitors are used
in the typical operating circuit (Figure 1) because of the
high source impedance seen in typical lab setups.
Actual applications usually have much lower source
impedance since the step-up regulator often runs
directly from the output of another regulated supply.
Typically, C IN can be reduced below the values used in
the typical operating circuit. Ensure a low-noise supply
at V CC by using adequate C IN . Alternately, greater volt-
age variation can be tolerated on C IN if VCC is decou-
pled from C IN using an RC lowpass filter (see R1 and
C5 in Figure 1).
I IN ( DC , MAX ) =
0.5 A × 13 V
2 . 5 V × 0 . 8
≈ 3 . 25 A
Rectifier Diode
The MAX17075’s high switching frequency demands a
high-speed rectifier. Schottky diodes are recommend-
The ripple current and the peak current are:
ed for most applications because of their fast recovery
time and low forward voltage. In general, a 2A Schottky
I RIPPLE =
2 . 5 V × ( 13 V ? 2 . 5 V )
3 . 3 μH × 13 V × 1 . 2 MHz
≈ 0 . 5 1 A
diode complements the internal MOSFET well.
Output Voltage Selection
The output voltage of the step-up regulator can be
I PEAK = 3 . 25 A +
0.51A
2
≈ 3 . 51 A
adjusted by connecting a resistive voltage-divider from
the output (V AVDD ) to ground with the center tap con-
nected to FB (see Figure 1). Select R9 in the 10k ? to
R 8 = R 9 × ? AVDD ? 1 ?
V AVDD _ RIPPLE ( C ) ≈ AVDD ? AVDD IN ? ,
V AVDD _ RIPPLE ( ESR ) ≈ I PEAK ESR _ AVDD
Output Capacitor Selection
The total output voltage ripple has two components: the
capacitive ripple caused by the charging and discharg-
ing of the output capacitance, and the ohmic ripple due
to the capacitor’s equivalent series resistance (ESR):
V AVDD _ RIPPLE = V AVDD _ RIPPLE ( C ) + V AVDD _ RIPPLE ( E S R)
I ? V ? V ?
C AVDD ? V AVDD f SW ?
and
R
where I PEAK is the peak inductor current (see the
50k ? range. Calculate R8 with the following equation:
? V ?
? V FB ?
where V FB , the step-up regulator’s feedback set point,
is 1.25V. Place R8 and R9 close to the IC.
Loop Compensation
Choose R COMP (R10 in Figure 1) to set the high-fre-
quency integrator gain for fast-transient response.
Choose C COMP (C12 in Figure 1) to set the integrator
zero to maintain loop stability.
For low-ESR output capacitors, use the following equa-
tions to obtain stable performance and good transient
response:
Inductor Selection section). For ceramic capacitors, the
output voltage ripple is typically dominated by
V AVDD _ RIPPLE(C) . The voltage rating and temperature
characteristics of the output capacitor must also be
R COMP ≈
312.5 × V IN × V AVDD × C AVDD
L AVDD × I AVDD ( MAX )
considered.
Maxim Integrated
C COMP ≈
V AVDD × C AVDD
10 × I AVDD ( MAX ) R COMP
19
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| MAX17075EVKIT+ | 功能描述:电源管理IC开发工具 MAX17075 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 |
| MAX17077AETM+ | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX17077AETM+T | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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| MAX17077ETM+ | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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