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参数资料
| 型号： | TC105333ECTTR |
| 厂商： | Microchip Technology |
| 文件页数： | 1/14页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM SOT23A-5 |
| 标准包装： | 3,000 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 345kHz |
| 占空比： | 100% |
| 电源电压： | 2.2 V ~ 10 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | SC-74A，SOT-753 |
| 包装： | 带卷 (TR) |
TC105
PFM/PWM Step-Down DC/DC Controller
Features
Package Type
?
?
57 μ A (Typ) Supply Current
1A Output Current
5-Pin SOT-23A
?
?
0.5 μ A Shutdown Mode
300kHz Switching Frequency for Small Inductor
V OUT
5
SHDN
4
Size
? Programmable Soft-Start
? 92% Typical Efficiency
TC105
? Small Package: 5-Pin SOT-23A
Applications
1
EXT
2
V DD
3
GND
?
?
?
?
?
?
?
Palmtops
Battery-Operated Systems
Portable Instruments
Positive LCD Bias Generators
Portable Communicators
Hand-Held Scanners
5V to 3V Down Converters
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A
General Description
The TC105 is a step-down (Buck) switching controller
that furnishes output currents of up to 1A (max) while
delivering a typical efficiency of 92%. The TC105
normally operates in pulse width modulation mode
(PWM), but automatically switches to pulse frequency
Device Selection Table
modulation (PFM) at low output loads for greater
efficiency. Oscillator frequency is 300kHz, allowing use
Part
Number
TC105503ECT
TC105333ECT
TC105303ECT
Output
Voltage
(V)*
5.0
3.3
3.0
Package
5-Pin SOT-23A
5-Pin SOT-23A
5-Pin SOT-23A
Osc.
Freq.
(kHz)
300
300
300
Operating
Temp.
Range
-40 ° C to +85 ° C
-40 ° C to +85 ° C
-40 ° C to +85 ° C
of small (22 μ H) inductors. Supply current draw is only
102 μ A (max), and is reduced to less than 0.5 μ A when
the SHDN input is brought low. Regulator operation is
suspended during shutdown. The TC105 accepts a
maximum input voltage of 10V.
The TC105 is available in a small 5-Pin SOT-23A
package, occupies minimum board space and is ideal
*Other output voltages are available. Please contact
Microchip Technology Inc. for details.
Functional Block Diagram
L 1 22 μ H (Sumida CD54)
for a wide range of applications.
3.3V
V OUT
D 1
MA737
5
4
R SS 470K
C SS
0.033 μ F
OFF ON
(From System
Control Logic)
C2
47 μ F
10V
Tantalum
V OUT
SHDN
TC105333ECT
Si 9430 P
+
V BATT
6V –
NiMH
EXT
1
V DD
2
C 1 10 μ F/16V
GND
3
3.3V Regulated Supply Using 6V
NiMH Battery Pack Input
2002 Microchip Technology Inc.
DS21349B-page 1
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