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| 型号： | MAX1565ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/26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 V BATT
1 μ F
10 μ H
INPUT
1-CELL
Li+
MAIN
1 μ F
DL_
OUTSU
L 1
L 2
D 1
OUTPUT
WHITE
IN
DCON
DL
C 2
3.3V
LEDs
FB_
AUX_
PART OF
Q 1
R 1
PWM
MAX1565
FB
MAX1565
62 ?
(FOR 20mA)
(PARTIAL)
R 2
Figure 6. AUX_ Channel Powering a White LED Step-Up
Current Source
SEPIC Buck-Boost
The MAX1565 ’ s internal switch step-up and step-down
can be cascaded to make a high-efficiency buck-boost
converter, but it may sometimes be desirable to build a
second buck-boost converter with an AUX_ controller.
One type of step-up/step-down converter is the SEPIC
(Figure 7). Inductors L1 and L2 can be separate induc-
tors or wound on a single core and coupled like a
transformer. Typically, a coupled inductor improves
efficiency since some power is transferred through the
coupling, causing less power to pass through the cou-
pling capacitor (C2). Likewise, C2 should have low ESR
to improve efficiency. The ripple current rating must be
greater than the larger of the input and output currents.
The MOSFET (Q1) drain-to-source voltage rating, and
Figure 7. Auxiliary SEPIC Configuration
secondary that is not fed back is small when compared
to the load on the one that is. Regulation also improves
if the load current range is limited. Consult the trans-
former manufacturer for the proper design for a given
application.
Boost with Charge Pump for Positive and
Negative Outputs
Negative output voltages can be produced without a
transformer, using a charge-pump circuit with an auxil-
iary controller as shown in Figure 9. When MOSFET Q1
turns off, the voltage at its drain rises to supply current
to V OUT +. At the same time, C1 charges to the voltage
V OUT + through D1.
+15V
the rectifier (D1) reverse-voltage rating must exceed
the sum of the input and output voltages. Other types of
step-up/step-down circuits are a flyback converter and
TO V BATT
1 μ F
1 μ F
30mA
CCD+
1.1M ?
a step-up converter followed by a linear regulator.
Multiple Output Flyback Circuits
AUX_
100k ?
Some applications require multiple voltages from a single
converter channel. This is often the case when generating
voltages for CCD bias or LCD power. Figure 8 shows a
two-output flyback configuration with AUX_. The
controller drives an external MOSFET that switches the
transformer primary. Two transformer secondaries
generate the output voltages. Only one positive output
PWM
OUTSU
DL_
FB_
1 μ F
-7.5V
20mA
CCD-
*(SEE NOTE)
voltage can be fed back, so the other voltages are set
by the turns ratio of the transformer secondaries. The
load stability of the other secondary voltages depends
on transformer leakage inductance and winding resis-
MAX1565
(PARTIAL)
*LOAD RESISTOR REQUIRED IF -7.5V
OPERATES WITH NO LOAD
tance. Voltage regulation is best when the load on the
Figure 8. +15V and -7.5V CCD Bias with Transformer
22
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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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