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| 型号： | MAX1702BETX+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/19页 |
| 文件大小： | 0K |
| 描述： | IC PWR MNG TRPL OUT 36-TQFN |
| 标准包装： | 50 |
| 应用： | 处理器 |
| 电源电压： | 2.6 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 包装： | 管件 |
Triple-Output Power-Management IC for
Microprocessor-Based Systems
Table 1. Suggested Inductors
MANUFACTURER
Coilcraft
Coilcraft
Sumida
Sumida
Sumida
PART NUMBER
DO1606
LPT1606-472
CDRH4D28-4R7
CDRH5D18-4R1
CR43
INDUCTANCE (μH)
4.7
4.7
4.7
4.1
4.7
ESR (mW)
120
240 (max)
56
57
108.7
SATURATION CURRENT
(A)
1.2
1.2
1.32
1.95
1.15
DIMENSIONS
(mm)
5.3 x 5.3 x 2
6.5 x 5.3 x 2.0
4.6 x 5 x 3
5.5 x 5.5 x 2
4.5 x 4 x 3.5
I RMS = I LOAD ? V OUT ( V IN ? V OUT ) ?
?
?
The inductor current becomes discontinuous if I OUT
decreases to LIR/2 from the output current value used
to determine L IDEAL .
Input Capacitor Selection
The input capacitor reduces the current peaks drawn
from the battery or input power source and reduces
switching noise in the IC. The impedance of the input
capacitor at the switching frequency should be less
than that of the input source so high-frequency switch-
ing currents do not pass through the input source but
instead are shunted through the input capacitor.
The input capacitor must meet the ripple-current require-
ment (I RMS ) imposed by the switching currents. The input
capacitor RMS current is:
? ?
? V IN ?
Output Capacitor Selection
The output capacitor is required to keep the output-volt-
age ripple small and to ensure regulation control-loop
stability. The output capacitor must have low impedance
at the switching frequency. Ceramic capacitors are rec-
ommended. The output ripple is approximately:
Setting the Battery Detectors
The low-battery and dead-battery detector trip points
can be set by adjusting the resistor values of the
divider string (R1, R2, and R3) in Figure 1 according to
the following:
1) Choose R3 to be less than 250k ?
2) R1 = R3 ? V BL ? (1 - V TH /V BD )
3) R2 = R3 ? (V TH ? V BL /V BD - 1)
where V BL is the low-battery voltage, V BD is the dead-
battery voltage, and V TH = 1.235V.
PC Board Layout and Routing
High switching frequencies and large peak currents
make PC board layout a very important part of design.
Good design minimizes excessive EMI on the feedback
paths and voltage gradients in the ground plane, both
of which can result in instability or regulation errors.
Connect the inductor, input filter capacitor, and output
filter capacitor as close together as possible, and keep
their traces short, direct, and wide. Connect their
ground pins to a single common power ground plane.
The external voltage-feedback network should be very
close to the FB pin, within 0.2in (5mm). Keep noisy
traces (from the LX pin, for example) away from the
voltage-feedback network; also, keep them separate,
V RIPPLE ≈ LIR × I OUT ( MAX ) × ? ESR +
2 × f OSC × C OUT ?
?
?
1 ?
?
using grounded copper. Connect GND and PG_ pins
together at a single point, as close as possible to the
MAX1702B. Refer to the MAX1702B evaluation kit for a
PC board layout example.
See the Compensation and Stability section for a dis-
cussion of the influence of output capacitance and ESR
on regulation control-loop stability.
The capacitor voltage rating must exceed the maximum
applied capacitor voltage. Consult the manufacturer ’ s
specifications for proper capacitor derating. Avoid Y5V
and Z5U dielectric types due to their huge voltage and
temperature coefficients of capacitance and ESR. X7R
and X5R dielectric types are recommended.
Chip Information
TRANSISTOR COUNT: 10,890
PROCESS: BiCMOS
16
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1702BETX+ | 功能描述:PMIC 解决方案 Triple-Output for MPU-Based System RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1702BETX+T | 功能描述:PMIC 解决方案 Triple-Output for MPU-Based System RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1702BETX-T | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1702EVKIT | 功能描述:电源管理IC开发工具 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 |
| MAX17030EVKIT+ | 功能描述:电源管理IC开发工具 MAX17030 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 |
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