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RT4805AWSC Datasheet(PDF) 1 Page - Richtek Technology Corporation

Part # RT4805AWSC
Description  Synchronous Boost Regulator with Bypass Mode
PDF  22 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT4805AWSC Datasheet(HTML) 1 Page - Richtek Technology Corporation

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RT4805A
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS4805A-02
April
2017
www.richtek.com
1
2.5MHz, Synchronous Boost Regulator with Bypass Mode
General Description
The RT4805A 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 RT4805A 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 1
A,
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 RT4805A
is available in the WL-CSP-16B
1.67x1.67 (BSC) package.
Features
4 Few External Components : 0.47
H 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 3.6V
VSEL = H 3.7V
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
I
2C 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
VIN
RT4805A
VOUT
LX
VSEL
EN
AGND PGND
CIN
+
-
nBYP
COUT
SCL
SDA
L1
PGOOD
To pull high voltage


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