|
|
RT4805のメーカーはRichtek Technologyです、この部品の機能は「Synchronous Boost Regulator」です。 |
部品番号 | RT4805 |
| |
部品説明 | Synchronous Boost Regulator | ||
メーカ | Richtek Technology | ||
ロゴ | |||
このページの下部にプレビューとRT4805ダウンロード(pdfファイル)リンクがあります。 Total 22 pages
RT4805
2.5MHz, Synchronous Boost Regulator with Bypass Mode
General Description
The RT4805 allows systems to take advantage of new
battery chemistries that can supply significant energy
when the battery voltage is lower than the required
voltage for system power ICs. By combining built-in
power transistors, synchronous rectification, and low
supply current; this IC provides a compact solution for
systems using advanced Li-Ion battery chemistries.
The RT4805 is a boost regulator designed to provide a
minimum output voltage from a single-cell Li-Ion battery,
even when the battery voltage is below system
minimum. In boost mode, output voltage regulation is
guaranteed to a maximum load current of 2A.
Quiescent current in Shutdown Mode is less than 1A,
which maximizes battery life. The regulator transitions
smoothly between Bypass and normal Boost Mode.
The device can be forced into Bypass Mode to reduce
quiescent current.
The RT4805 is available in the WL-CSP-16B 1.67x1.67
(BSC) package.
Features
4 Few External Components: 0.47H Inductor
and 0603 Case Size Input and Output Capacitors
Input Voltage Range: 1.8V to 5V
Output Range from 2.85V to 4.4V
VSEL = L 3.2V
VSEL = H 3.4V
Maximum Continuous Load Current: 2A at VIN >
2.65V Boosting VOUT to 3.35V
Up to 96% Efficient
True Bypass Operation when VIN > Target VOUT
Internal Synchronous Rectifier
True Load Disconnect when Shut Down
Forced Bypass Mode
VSEL Control to Optimize Target VOUT
Short-Circuit Protection
I2C Controlled Interface
Ultra low Operating Quiescent Current
Small WL-CSP 16B Package
Applications
Single-Cell Li-Ion, LiFePO4 Smart-Phones or Tablet
2.5G/3G/4G Mini-Module Data Cards
Simplified Application Circuit
+ CIN
-
L1
RT4805
VIN VOUT
LX
VSEL
EN
nBYP
SDA
SCL
PGOOD
AGND PGND
COUT
To pull high voltage
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS4805-00 November 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 Page Function Block Diagram
SCL
SDA
nBYP
VSEL
EN
PGOOD
Digital
Soft-Start
Control
OSC
+
+
+
-
Current
Sense
+
-
PSM
Control
PWM
Logic
Power
MOS
Control
Stage
ZCD
RT4805
VIN
VMIN
Control
VMAX
Control
VOUT
LX
AGND
PGND
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS4805-00 November 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3
3Pages RT4805
EN input
0
1
1
nBYP input
0/1
0
1
Table 1
Device State
The device is shut down in pass-through mode featuring a shutdown current
down to ca. 1A typ.
The device is active in forced pass-through mode.
The device supply current is approximately 15A typ. From the battery. The
device is short circuit protected by a current limit of ca. 4000mA.
The device is active in auto mode (dc/dc boost, pass-through mode)
The device supply current is approximately 55A typ. from the battery
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
6
is a registered trademark of Richtek Technology Corporation.
DS4805-00 November 2015
6 Page | |||
ページ | 合計 : 22 ページ | ||
|
PDF ダウンロード | [ RT4805 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
RT4803 | Synchronous Boost Regulator | Richtek Technology |
RT4803A | Synchronous Boost Regulator | Richtek Technology |
RT4805 | Synchronous Boost Regulator | Richtek Technology |
RT4805A | Synchronous Boost Regulator | Richtek Technology |