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参数资料
| 型号： | MAX1565ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/26页 |
| 文件大小： | 0K |
| 描述： | IC DGTL CAM PWR-SUP 5CH 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 应用： | 转换器控制器，数字式相机 |
| 输入电压： | 0.7 V ~ 5.5 V |
| 输出数： | 5 |
| 输出电压： | 3.3V，1.25 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
TO BATT
V OUT
OUTSU
DL
IN
MAX1565
FB
MAX1801 OSC
OSC
(PARTIAL)
COMP
GND
REF
DCON
REF
Figure 11. Connecting the MAX1801 Slave PWM Controller to the MAX1565
Using SDOK for Power Sequencing
SDOK goes low when the step-down reaches regula-
tion. Some microcontrollers with low-voltage cores
require that the high-voltage (3.3V) I/O rail not be
MAX1565
powered up until the core has a valid supply. The
circuit in Figure 12 accomplishes this by driving the
(PARTIAL)
OUTSUB
gate of a PFET connected between the 3.3V output and
the microcontroller I/O supply. Alternately, power
OUTSUA
3.35V
sequencing may be implemented by connecting RC
networks to the appropriate converter ON_ inputs.
STEP-UP
LXSU
10 μ H
TO
VBATT
Setting OUTSD Below 1.25V
The step-down feedback voltage is 1.25V when
FBSELSD is high. With a standard two-resistor feed-
back network, the output voltage may be set to values
between 1.25V and the input voltage. If a step-down
output voltage less than 1.25V is desired, it can be set by
adding a third feedback resistor from FB to a voltage
higher than 1.25V (the step-up output is a convenient
voltage for this) as shown in Figure 13.
The equation governing output voltage shown in Figure
13 is:
PGNDB
FBSU
SDOK
INSD
1 0 μ F
10 μ F
1M ?
TO V BATT
OR OUTSU
1M ?
3.3V
TO
CPU
0 = [(V SD - V FBSD )/R1] + [(0 - V FBSD )/R2]
+ [(V SU - V FBSD )/R3]
STEP-DOWN
LXSD
4.7 μ H
V CORE
1.5V
where V SD is the output voltage, V FBSD is 1.25V, and
V SU is the step-up output voltage. Note that any avail-
able voltage that is higher than 1.25V can be used as
the connection point for R3 in Figure 13 and for the V SD
term in the equation. Since there are multiple solutions
for R1, R2, and R3, the above equation cannot be writ-
ten in terms of one resistor. The best method for deter-
mining resistor values is to enter the above equation
into a spreadsheet and test estimated resistors ’ values.
A good starting point is with 100k ? at R2 and R3.
10 μ F
FBSD
PGNDA
Figure 12. Using SDOK to Gate 3.3V Power to CPU After the
Core Voltage is OK
24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1565ETJ+ | 功能描述:PMIC 解决方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1565ETJ+T | 功能描述:PMIC 解决方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1565ETJ-T | 功能描述:PMIC 解决方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1565EVKIT | 制造商:Maxim Integrated Products 功能描述:SMALL, HIGH-EFFICIENCY, FIVE-CHANNEL DSC - Bulk |
| MAX1566ETL | 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 |
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