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参数资料
| 型号： | RH5RH453B-T1 |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | Replaced by TPS61030 : High Frequency, Multimode Synchronous Controller 20-TSSOP 0 to 70 |
| 中文描述： | 0.25 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | SOT-89, 5 PIN |
| 文件页数： | 2/29页 |
| 文件大小： | 199K |
| 代理商： | RH5RH453B-T1 |
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PWM STEP-UP DC/DC CONVERTER
1
RH5RH
××
1A/
××
2B/
××
3B SERIES
OUTLINE
The RH5RH
××
1A/
××
2B/
××
3B Series are PWM Step-up DC/DC converter ICs by CMOS process.
The RH5RH
××
1A IC consists of an oscillator, a PWM control circuit, a driver transistor (Lx switch), a refer-
ence voltage unit, an error amplifier, a phase compensation circuit, resistors for voltage detection, a soft-start cir-
cuit, and an Lx switch protection circuit. A low ripple, high efficiency step-up DC/DC converter can be constructed
of this RH5RH
××
1A IC with only three external components, that is, an inductor, a diode and a capacitor.
These RH5RH
××
1A/
××
2B/
××
3B ICs can achieve ultra-low supply current (no load) –TYP. 15μA –by a new-
ly developed PWM control circuit, equivalent to the low supply current of a VFM (chopper) Step-up DC/DC con-
verter.
Furthermore, these ICs can hold down the supply current to TYP. 2μA by stopping the operation of the oscil-
lator when the input voltage > (the output voltage set value + the dropout voltage by the diode and the inductor).
These RH5RH
××
1A/
××
2B/
××
3B Series ICs are recommendable to the user who desires a low ripple PWM
DC/DC converter, but cannot adopt a conventional PWM DC/DC converter because of its too large supply current.
The RH5RH
××
2B/
××
3B Series ICs use the same chip as that employed in the RH5RH
××
1A IC and are pro-
vided with a drive pin (EXT) for an external transistor. Because of the use of the drive pin (EXT), an external
transistor with a low saturation voltage can be used so that a large current can be caused to flow through the
inductor and accordingly a large output current can be obtained. Therefore, these RH5RH
××
2B/
××
3B Series ICs
are recommendable to the user who need a current as large as several tens mA to several hundreds mA.
The RH5RH
××
3B IC also includes an internal chip enable circuit so that it is possible to set the standby sup-
ply current at MAX. 0.5μA.
These RH5RH
××
1A/
××
2B/
××
3B ICs are suitable for use with battery-powered instruments with low noise
and low supply current.
Small Number of External Components
..........
Only an inductor, a diode and a capacitor (RH5RH
××
1A)
Low Supply Current
...........................................
TYP. 15μA (RH5RH301A)
Low Ripple and Low Noise
Low Start-up Voltage (when the output current is 1mA)
..................
MAX. 0.9V
High Output Voltage Accuracy
..........................
±2.5%
High Efficiency
...................................................
TYP. 85%
Low Temperature-Drift Coefficient of Output Voltage
......................
TYP. ±50 ppm/C
Soft-Start
.............................................................
MIN. 500μs
Small Packages
...................................................
SOT-89 (RH5RH
××
1A, RH5RH
××
2B),
SOT-89-5 (RH5RH
××
3B)
APPLICATIONS
Power source for battery-powered equipment.
Power source for cameras, camcorders, VCRs, PDAs, electronic data banks,and hand-held communication
equipment.
Power source for instruments which require low noise and low supply current, such as hand-held audio equip-
ment.
Power source for appliances which require higher cell voltage than that of batteries used in the appliances.
FEATURES
相关PDF资料 |
PDF描述 |
|---|---|
| RH5RH453B-T2 | PWM STEP-UP DC/DC CONVERTER |
| RH5RH481A-T1 | Microprocessor Supervisor with Watchdog Timer 8-SOIC 0 to 70 |
| RH5RH481A-T2 | PWM STEP-UP DC/DC CONVERTER |
| RH5RH482B-T1 | PWM STEP-UP DC/DC CONVERTER |
| RH5RH482B-T2 | PWM STEP-UP DC/DC CONVERTER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| RH5RH453B-T2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:PWM STEP-UP DC/DC CONVERTER |
| RH5RH461A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| RH5RH461A-T1 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:PWM STEP-UP DC/DC CONVERTER |
| RH5RH461A-T2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:PWM STEP-UP DC/DC CONVERTER |
| RH5RH462B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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