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参数资料
| 型号： | MAX8620YETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC UPMIC FOR MPU 14-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 微型电源管理集成电路（UPMIC），DSP |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 3 |
| 输出电压： | 0.6 V ~ 3.3 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
μPMIC for Microprocessors or DSPs
in Portable Equipment
R 1 = R 2 ? OUT 3 ? 1 ?
If a long-key press is preferred, see Figure 6. PWR_ON
must remain high until a microprocessor asserts a logic-
high signal when using this circuit. If a system includes
multiple power-on sources, use a diode OR configura-
tion, as shown in Figure 7.
current, I FB , is typically 10nA. Select R2 so the resistor-
divider bias current dominates I FB by a factor of 10. A
wide range of resistor values is acceptable, but a good
starting point is to choose R2 = 100k ? . R1 is given by:
? V ?
? V FB ?
where V FB = 0.6V.
POWER-ON
V CORE
V OUT3 can be set between 0.6V and 3.3V, but the step-
KEY
1M ?
MAX8620Y
PWR_ON
V I/O
V ANA
μ P
PWR HOLD
down converter dropout voltage and inductor voltage
drop impact how close V OUT3 can be to V IN2 . Total
dropout voltage is a function of the pFET on-resistance,
the DCR of the inductor, and the load as follows:
V OUT 3 ( DO ) = I OUT 3 × ( R ONP + DCR INDUCTOR )
For example, with 300mA load:
POWER-HOLD SIGNAL
Figure 6. Long-Key Power-On Closed Loop
V OUT 3 ( DO ) = 300 mA × ( 0 . 65 ? + 50 m ? ) = 210 mV
As a result, V IN1 = V IN2 must exceed the desired
V OUT3 by 210mV to maintain regulation.
Inductor Selection
The MAX8620Y step-down converter operates with induc-
tors between 1μH and 4.7μH. Low inductance values are
AC ADAPTER
HANDS-FREE KIT
MAX8620Y
HF_PWR
V CORE
V I/O
V ANA
μ P
physically smaller but require faster switching, which
results in some efficiency loss. See the Typical Operating
Characteristics section for efficiency and switching fre-
quency versus inductor value plots. The inductor’s DC
POWER-ON
KEY
1M ?
PWR_ON
PWR HOLD
current rating needs to be only 100mA greater than the
application ’s maximum load current because the
MAX8620Y step-down converter features zero-current
overshoot during startup and load transients.
For output voltages above 2.0V, when light-load effi-
POWER-HOLD SIGNAL
Figure 7. Multiple Power-On Inputs
Setting the Step-Down Output Voltage
(OUT3)
Select a step-down converter output voltage between
0.6V and 3.3V by connecting a resistor voltage-divider
between LX, FB, and GND (see Figure 2 ) . The FB bias
ciency is important, the minimum recommended induc-
tor is 2.2μH. For optimum voltage-positioning load
transients, choose an inductor with DC series resis-
tance in the 50m ? to 150m ? range (Table 3). For high-
er efficiency at heavy loads (above 200mA) or minimal
load regulation (but some transient overshoot), the
resistance should be kept below 100m ? . For light-load
applications up to 200mA, much higher resistance is
acceptable with very little impact on performance.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8620YEVKIT | 功能描述:PMIC 解决方案 MAX8620Y Evaluation Kit RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8621ETG | 功能描述:PMIC 解决方案 Dual Step-Down PMIC for Portable Devices RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8621ETG+ | 功能描述:PMIC 解决方案 Dual Step-Down PMIC for Portable Devices RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8621ETG+T | 功能描述:PMIC 解决方案 Dual Step-Down PMIC for Portable Devices RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8621ETG-T | 功能描述:PMIC 解决方案 Dual Step-Down PMIC for Portable Devices RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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