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參數(shù)資料
| 型號： | MAX1565 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply |
| 中文描述： | 小型、高效率、5路輸出數(shù)碼相機(jī)電源 |
| 文件頁數(shù)： | 24/26頁 |
| 文件大?。?/td> | 512K |
| 代理商： | MAX1565 |
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M
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
powered up until the core has a valid supply. The
circuit in Figure 12 accomplishes this by driving the
gate of a PFET connected between the 3.3V output and
the microcontroller I/O supply. Alternately, power
sequencing may be implemented by connecting RC
networks to the appropriate converter ON_ inputs.
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:
0 = [(V
SD
- V
FBSD
)/R1] + [(0 - V
FBSD
)/R2]
+ [(V
SU
- V
FBSD
)/R3]
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.
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
24
______________________________________________________________________________________
MAX1565
(PARTIAL)
MAX1801
TO BATT
DL
FB
COMP
GND
REF
OSC
IN
DCON
OUTSU
OSC
REF
V
OUT
Figure 11. Connecting the MAX1801 Slave PWM Controller to the MAX1565
STEP-UP
STEP-DOWN
MAX1565
(PARTIAL)
OUTSUB
OUTSUA
LXSU
PGNDB
FBSU
SDOK
INSD
LXSD
FBSD
10
μ
H
4.7
μ
H
10
μ
F
10
μ
F
1
0
μ
F
TO
VBATT
1M
1M
3.35V
3.3V
TO
CPU
V
CORE
1.5V
TO V
OR OUTSU
PGNDA
Figure 12. Using SDOK to Gate 3.3V Power to CPU After the
Core Voltage is OK
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1565ETJ | Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply |
| MAX1566-MAX1567 | Six-Channel, High-Efficiency, Digital Camera Power Supplies |
| MAX156ACNG | 8-/4-Channel ADCs with Simultaneous T/Hs and Reference |
| MAX156BCNG | 8-/4-Channel ADCs with Simultaneous T/Hs and Reference |
| MAX156BENG | 8-/4-Channel ADCs with Simultaneous T/Hs and Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1565ETJ | 功能描述:PMIC 解決方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX1565ETJ+ | 功能描述:PMIC 解決方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX1565ETJ+T | 功能描述:PMIC 解決方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX1565ETJ-T | 功能描述:PMIC 解決方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX1565EVKIT | 制造商:Maxim Integrated Products 功能描述:SMALL, HIGH-EFFICIENCY, FIVE-CHANNEL DSC - Bulk |
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