Datasheet > RP901K001B-TR

RP901K001B-TR

更新时间： 2024-11-11 20:40:35

品牌	Logo	应用领域
理光 - RICOH		开关
页数	文件大小	规格书
29页	1086K
描述
Switching Regulator

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RP901K001B-TR 技术参数

生命周期：	Active	包装说明：	,
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.69
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	Base Number Matches：	1

RP901K001B-TR 数据手册

RP901K SERIES

Synchronous Step-down DC/DC Converter with VD and VR

NO.EA-156-121225

OUTLINE

The RP901xxxx is a CMOS-based current mode PWM control synchronous step-down DC/DC converter with a

voltage detector (VD) and an LDO regulator (VR).

Each of Step-down DC/DC converters is composed of an oscillator, a voltage reference unit, an error amplifier, a

switching control circuit, a soft-start circuit, a protection circuit, a UVLO circuit, a switching transistor. Due to the

switching elements are built in and synchronous control, a high efficiency step-down DC/DC converter can be

made with an inductor and capacitors. To realize high efficiency at light load, automatic PWM/VFM alternative

mode can be selected other than the PWM fixed control mode.

As protection circuits, a current limit circuit which limits Lx peak current cycle by cycle and a hiccup mode

protection circuit which works if the load current over the limit continues for a certain time^*1are built in. The output

voltage can be preset with 0.05V step in the factory due to the built-in feed back resistance, and the tolerance is

±2%. Since the package is DFN (PLP) 2527-10, high density mounting on board is possible.

Built-in LDO regulator (VR) is composed of a voltage reference unit, a voltage detecting resistor-network, an

error amplifier, a short current limit circuit, and a driver transistor. After the soft-start time of the DC/DC converter

is over and a specified delay time, LDO starts up. The sequence function is fixed internally^*2.

Built-in voltage detector (VD) supervises the input voltage or the output of the VR (The reset function works for

UVLO and over-current of the DC/DC converter). The option is preset in the factory. The output type is N-channel

open drain. The released delay time is built-in, typ.50ms.

If the junction temperature of the IC is over the limit, the system is reset by the built-in thermal shut-down circuit.

*1) A version: As soon as the load current is over the limit, the system restarts by the protection.

*2) C, D versions: No sequence function

FEATURES

• Input Voltage Range················································· 4.5V to 5.5V

• Supply Current·························································· Typ. 460µA (at PWM mode)

Typ. 170µA (at light load applied to B, C, D versions)

Step-down DC/DC Converter

• Output Voltage Range ·············································· 1.2V to 1.8V, preset is possible by user’s request

• Output Voltage Tolerance ········································· ±2%

• Oscillator Frequency················································· Typ. 1.2MHz

• Built-in driver ON resistance····································· Typ. P-channel 0.25Ω, N-channel 0.25Ω (at V_IN=5V)

• Soft-start function······················································ Typ. 1ms

• Lx peak current limit function···································· Typ. 1.4A (D version: 1.5A)

• Output Current·························································· Min. 800mA (D version: 900mA)

• Protection Delay Time ·············································· Typ. 0.1ms (applied to B, C, D versions)

• UVLO function ·························································· Typ. 3.5V

• Chip enable function················································· ”H” active

Ver. 1.0

12 3 4 5 6 7...29

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