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| 型号： | LM2574DW-ADJR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 2/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.5A 16SOICW |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 1,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 37 V |
| 输入电压： | 4.75 V ~ 40 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 52kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SOIC W |
LM2574, NCV2574
Typical Application (Fixed Output Voltage Versions)
Feedback
7.0 ? 40 V
Unregulated
DC Input
C in
22 m F
+V in
5
(12)
2
Sig
Gnd
LM2574
4 Pwr 3
Gnd
(3)
1
Output
(14)
7
ON/OFF
L1
330 m H
D1
1N5819
C out
220 m F
5.0 V Regulated
Output 0.5 A Load
(4)
(6)
(5)
Representative Block Diagram and Typical Application
Unregulated
DC Input
C in
+V in
5
1
(12)
(3)
3.1 V Internal
Regulator
ON/OFF
ON/OFF
3
(5)
Output
Voltage Versions
3.3 V
5.0 V
12 V
R2
( W )
1.7 k
3.1 k
8.84 k
Feedback
Current
15 V
11.3 k
R2
Fixed Gain
Error Amplifier Comparator
Limit
For adjustable version
R1 = open, R2 = 0 W
R1
1.0 k
Freq
Shift
Latch
Driver
Output
L1
V out
Sig Gnd
2
(4)
18 kHz
1.235 V
Band?Gap
Reference
52 kHz
Oscillator
Reset
Thermal
Shutdown
1.0 Amp
Switch
7 (14)
Pwr Gnd
4
(6)
D1
C out
Load
NOTE: Pin numbers in ( ) are for the SO?16W package.
Figure 1. Block Diagram and Typical Application
ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur).
Rating
Maximum Supply Voltage
ON/OFF Pin Input Voltage
Output Voltage to Ground (Steady State)
Symbol
V in
?
?
Value
45
?0.3 V ≤ V ≤ +V in
?1.0
Unit
V
V
V
DW Suffix, Plastic Package Case 751G
Max Power Dissipation
Thermal Resistance, Junction?to?Air
P D
R q JA
Internally Limited
145
W
° C/W
N Suffix, Plastic Package Case 626
Max Power Dissipation
Thermal Resistance, Junction?to?Ambient
Thermal Resistance, Junction?to?Case
Storage Temperature Range
Minimum ESD Rating
P D
R q JA
R q JC
T stg
?
Internally Limited
100
5.0
?65 ° C to +150 ° C
2.0
W
° C/W
° C/W
° C
kV
(Human Body Model: C = 100 pF, R = 1.5 k W )
Lead Temperature (Soldering, 10 seconds)
Maximum Junction Temperature
?
T J
260
150
° C
° C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
NOTE: ESD data available upon request.
http://onsemi.com
2
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