RT4805B Boost Regulator Datasheet

RT4805B Datasheet, PDF, Equivalent


Part Number

RT4805B

Description

Synchronous Boost Regulator

Manufacture

Richtek

Total Page 23 Pages
Datasheet
Download RT4805B Datasheet


RT4805B
RT4805B
2.5MHz, Synchronous Boost Regulator with Bypass Mode
General Description
The RT4805B 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 RT4805B 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 RT4805B 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 3.15V
VSEL = H 3.6V
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
RT4805B
VIN VOUT
+ CIN
-
COUT
L1
LX
VSEL
To pull high voltage
EN
nBYP
SDA
PGOOD
SCL
AGND PGND
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
DS4805B-01 April 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT4805B
RT4805B
Ordering Information
RT4805B
Package Type
WSC : WL-CSP-16B 1.67x1.67 (BSC)
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
Pin Configuration
(TOP VIEW)
A1 A2 A3 A4
EN PGOOD VIN VIN
B1 B2 B3 B4
VSEL SCL VOUT VOUT
C1 C2 C3
nBYP SDA LX
C4
LX
D1 D2 D3 D4
AGND PGND PGND PGND
WL-CSP-16B 1.67x1.67 (BSC)
4MW
4M : Product Code
W : Date Code
Functional Pin Description
Pin No.
Pin Name
Pin Function
A1 EN
Enable. When this pin is HIGH, the circuit is enabled.
A2
PGOOD
Power good. It is a open-drain output. PGOOD pin pulls low automatically if
the overload or OTP event occurs.
A3, A4
VIN
Input voltage. Connect to Li-Ion battery input power source.
B1 VSEL
B2 SCL
Output voltage select. When boost is running, this pin can be used to select
output voltage
Serial interface clock. (Pull down if I2C is non-used).
B3, B4
C1
C2
VOUT
nBYP
SDA
Output voltage. Place COUT as close as possible to the device.
Bypass. This pin can be used to activate forced bypass mode. When this pin
is LOW, the bypass switches are turned on and the IC is otherwise inactive.
Serial interface date line. (Pull down if I2C is non-used).
C3, C4
LX
Switching node. Connect to inductor.
D1 AGND
Analog ground. This is the signal ground reference for the IC. All voltage
levels are measured with respect to this pin.
D2, D3, D4 PGND
Power ground. This is the power return for the IC. The COUT bypass
capacitor should be returned with the shortest path possible to these pins.
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS4805B-01 April 2017


Features RT4805B 2.5MHz, Synchronous Boost Regul ator with Bypass Mode General Descript ion The RT4805B allows systems to take advantage of new battery chemistries th at can supply significant energy when t he battery voltage is lower than the re quired voltage for system power ICs. By combining built-in power transistors, synchronous rectification, and low supp ly current; this IC provides a compact solution for systems using advanced Li- Ion battery chemistries. The RT4805B is a boost regulator designed to provide a minimum output voltage from a single- cell Li-Ion battery, even when the batt ery voltage is below system minimum. In boost mode, output voltage regulation is guaranteed to a maximum load current of 2A. Quiescent current in Shutdown M ode is less than 1A, which maximizes battery life. The regulator transition s smoothly between Bypass and normal Bo ost Mode. The device can be forced into Bypass Mode to reduce quiescent curren t. The RT4805B is available in the WL-CSP-16B 1.67x1.67 (BSC) pac.
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