参数资料
| 型号： | MIC29201-12WU |
| 厂商： | Micrel Inc |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 12V .4A TO-263-5 |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 12V |
| 输入电压： | 最高 26V |
| 电压 - 压降（标准）： | 0.4V @ 400mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 400mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 供应商设备封装： | TO-263-5 |
| 包装： | 管件 |
| 产品目录页面： | 1107 (CN2011-ZH PDF) |
| 其它名称： | 576-2211 MIC29201-12WU-ND |
MIC2920A/29201/29202/29204
Micrel, Inc.
Notes:
General:
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Devices are ESD protected; however, handling precautions are recommended.
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical speci?cations do not apply when
operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the maximum
junction temperature, T J (MAX) , the junction-to-ambient thermal resistance, θ JA , and the ambient temperature, T A . The maximum allowable
power dissipation at any ambient temperature is calculated using: P (MAX) = (T J(MAX) – T A ) / θ JA. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The junction to ambient thermal
resistance of the MIC29204BM is 160°C/W mounted on a PC board.
Output voltage temperature coef?cient is de?ned as the worst case voltage change divided by the total temperature range.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to heating effects
are covered by the thermal regulation speci?cation.
Dropout Voltage is de?ned as the input to output differential at which the output voltage drops 100mV below its nominal value measured at
1V differential. At low values of programmed output voltage, the minimum input supply voltage of 4.3V over temperature must be taken into
account. The MIC2920A operates down to 2V of input at reduced output current at 25°C.
Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground
pin current.
The MIC2920A features fold-back current limiting. The short circuit (V OUT = 0V) current limit is less than the maximum current with normal
output voltage.
Thermal regulation is de?ned as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or
line regulation effects. Speci?cations are for a 200mA load pulse at V IN = 20V (a 4W pulse) for T = 10ms.
V REF ≤ V OUT ≤ (V IN – 1 V), 4.3V ≤ V IN ≤ 26V, 1 mA < I L ≤400 mA, T J ≤ T J MAX.
Comparator thresholds are expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured
at 6V input. To express these thresholds in terms of output voltage change, multiply by the error ampli?er gain = V OUT /V REF = (R1 + R2)/R2.
For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 V
= 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below
nominal, 7.7% guaranteed.
V SHUTDOWN ≥ 2V, V IN ≤ 26V,V OUT = 0, with Adjust pin tied to 5V Tap or to the R1, R2 junction (see Figure 3) with R1 ≥ 150kΩ.
When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to
ground.
Maximum positive supply voltage of 60V must be of limited duration (< 100ms) and duty cycle ( ≤ 1%). The maximum continuous supply
voltage is 26V.
Schematic Diagram
IN
Q15A
Q15B
ADJUST
R18
20K ?
Q26
Q24
Q9
Q25
OUT
Q6
10
Q3
Q1
R11
18
K ?
C1
20
PF
Q4
Q5
Q2
R11
20.6
K ?
Q7
Q8
Q16
Q17
Q14
R17
12 K ?
R27
R28
SENSE
V TAP
Q42
Q40
R1
20 K ?
R2
50 K ?
Q41
R5
180
K ?
Q13
R6
140
K ?
Q12
R8
31.4 K ?
R9
27.8 K ?
R10
150
K ?
Q11
Q20
R12
110
K ?
R13
100
K ?
C2
40 PF
R14
350
K ?
Q21
Q22
R15
100 K ?
R16
30 K ?
R17
10 ?
Q23
Q29
R30
30
K ?
R3
50 K ?
R4
13 K ?
Q18
Q19
Q28
R21 8 ?
50 K ?
10 K ?
ERROR
Q37
Q36
R22
150 K ?
Q30 Q31
R24
50 K ?
R23 60 K ?
SHDN
Q38
Q34
February 2005
Q39
R26
60 K ?
R25
2.8 K ?
5
GND
D E NO T E S CO NNE CT I O N O N
MIC2920A-XX AND MIC29201-XX
VERSIONS ONLY
M9999-021505
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