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参数资料
| 型号： | MC33997DW |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH 3.3/5V SUPPLY 24-SOIC |
| 标准包装： | 30 |
| 应用： | 切换电源，微处理器 |
| 输入电压： | 6 V ~ 26.5 V |
| 输出数： | 5 |
| 输出电压： | 3.3V，5V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
33997
Lf1
10uH
VPWR
VSW
L1
15uH
VDDH = 5.0V
@ 1400mA total
Cf1
10uF
Cf 2 C1
1. 0uF 100uF
4
C2
1.0uF
I-lim
Drive
9
D1
R3
2.2R
C8
390pF
C3
68uF
C4
100nF
Optional
Soft
Start
Enb
Logic
&
Ramp
FBKB
11
Snubber
Dp1
KA_VPWR
Osc
Latch
V bg
VSUM
12
Cc 1
2.2nF
Rc1
3.6k
Dp2
2
VDDH
15
VREF1
Retry
VREF1
Reg.
Bandgap
Voltage
Snsenb Reference
Vbg
Enb
3.3V
Linear
Regulator
Driver
DRVL
13
FBL
14
Q1
C5
100nF
VDDL = 3.3V
@ 400mA
C6
68uF
Cs1
21
33nF
VREF2
Retry
VREF2
Reg.
Snsenb
Enable
Control
Snsenb
Enb
POR
Enb
V bg
3.3V
Standby
Reg.
VKAM
24
PWROK
10
VKAMOK
C7
4.7uF
R1
10k
VKAM = 3.3V
@ 10mA
R2
10k
16
Cs2
33nF
Charge
Pump
CRES 3
SNSEN 22 EN 23
PwrOK
VkamOK
5-8
GND
1
17-20
C9
22nF
Note The V DDH total output current is 1.4 A. This includes the current used by the linear regulator V DDL and buffered outputs V REF1 and
V REF2 .
Figure 10. 33997 Application Circuit Schematic Diagram
Table 5. Recommended Components
Designator
Cf1
Cf2, C2
C1
C3 (14)
C6
C7
C4, C5
C8 (Optional)
Value / Rating
10 μF / 50 V
1.0 μF / 50 V
100 μF / 50 V
68 μF / 10 V
68 μF / 10 V
4.7 μF / 10 V
100 nF / 16 V
390 pF / 50 V
Description / Part No.
Aluminum Electrolytic / UUB1H100MNR
Ceramic X7R / C1812C105K5RACTR
Aluminum Electrolytic / UUH1V101MNR
Tantalum / T494D686M010AS
Tantalum / T494D686M010AS
Tantalum / T494A475M010AS
Ceramic X7R
Ceramic X7R
Manufacturer (15)
Nichicon
Kemet
Nichicon
Kemet
Kemet
Kemet
Any Manufacturer
Any Manufacturer
Notes
14. It is possible to use ceramic capacitors in the switcher output, e.g. C3 = 2 x 22 μF / 6.3 V X7R ceramic. In this case the compensation
resistor has to be changed to Rc1 = 200 ? to stabilize the switching regulator operation.
15. Freescale does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit
drawings or tables. While Freescale offers component recommendations in this configuration, it is the customer’s responsibility to
validate their application.
33997
Analog Integrated Circuit Device Data
16
Freescale Semiconductor
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| MC33997DWR2 | 制造商:Rochester Electronics LLC 功能描述:MLPS 3.3 IC - Bulk |
| MC33999EK | 功能描述:多路器开关 IC 16 LOW SIDE PWM&SPI RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
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| MC33999EKR2 | 功能描述:多路器开关 IC 16 LOW SIDE PWM&SPI RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MC3399DW | 制造商: 功能描述: 制造商:undefined 功能描述: |
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