Boost Regulator. RT4803A Datasheet

RT4803A Regulator. Datasheet pdf. Equivalent

RT4803A Datasheet
Recommendation RT4803A Datasheet
Part RT4803A
Description Synchronous Boost Regulator
Feature RT4803A; .
Manufacture Richtek Technology
Datasheet
Download RT4803A Datasheet




Richtek Technology RT4803A
RT4803A
2.5MHz, Synchronous Boost Regulator
General Description
The RT4803A 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 RT4803A 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 2000mA.
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 RT4803A is available in the WL-CSP-16B
1.67x1.67 (BSC) package.
Applications
Single-Cell Li-Ion, LiFePO4 Smart-Phones or Tablet
2.5G/3G/4G Mini-Module Data Cards
Features
Input Voltage Range : 1.8V to 5V
Programmable Output Voltage from 2.85V to
4.4V with 50mV/Step
Default Boost Output Voltage Setting :
VOUT = 3.4V at VSEL = H
VOUT = 3.15V at VSEL = L
Maximum Continuous Load Current : 2A at VIN >
2.65V Boosting VOUT to 3.35V
Up to 95% Efficiency
nBYP (L) : Forced Bypass Mode
nBYP (H) : Auto Bypass Operation when VIN >
Target VOUT
Internal Synchronous Rectifier
Over-Current Protection
Under-Voltage Protection
Over-Voltage Protection
Over-Temperature Protection
Ultra Low Operating Quiescent Current
Discharge Function Trigger at GPIO Manual Pull
Low
Available in a WL-CSP-16B 1.67x1.67 (BSC)
Package
Simplified Application Circuit
VIN
CIN
MCU
RT4803A
VIN
L1
LX
VOUT
VOUT
COUT
VSEL
EN
nBYP
SDA
SCL
GPIO
AGND PGND
To pull high voltage
Rpull high
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
DS4803A-06 September 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek Technology RT4803A
RT4803A
Ordering Information
RT4803A
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
38W
38 : Product Code
W : Date Code
Pin Configuration
(TOP VIEW)
A1 A2 A3 A4
EN GPIO 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)
Functional Pin Description
Pin No.
Pin Name I/O
Pin Function
A1 EN
I
Chip enable input pin. High level voltage enables the device while low level
voltage turns the device off. This pin must be terminated.
A2 GPIO
I/O General purpose input/output. (Detail illustrate as operation section)
A3, A4 VIN
I Power supply input.
B1 VSEL
B2 SCL
Output voltage selection pin. Default boost output voltage setting VOUT =
I 3.4V at VSEL = H and VOUT = 3.15V at VSEL = L. This pin must be
terminated.
I Serial interface clock. (Pull down if I2C is non-used).
B3, B4 VOUT
O
Boost output voltage pin. PCB trace length from BSTVOUT to the output
filter capacitor should be as short and wide as possible.
C1 nBYP
C2 SDA
This pin can be used to activate forced bypass mode. When this pin is
I LOW, the bypass switches are turned on into forced bypass mode. Detail
mode define as Table 1 discussion.
I/O Serial interface date line. (Pull down if I2C is non-used)
C3, C4 LX
This pin is the connection between two build-in switches in the chip, which
I/O should be connected to the external inductor. The inductor should be
connected to this pin with the shortest path.
D1 AGND
-- Analog ground. This is the signal ground reference for the IC.
D2, D3, D4 PGND
--
Power ground should be connected to this pin with the shortest path for
power transmission to reduce parasitic component effect.
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS4803A-06 September 2019



Richtek Technology RT4803A
Functional Block Diagram
SCL
SDA
nBYP
VSEL
EN
GPIO
Digital
VREF
Current
Sense
OSC
+
-
+
-
PSM
Control
PWM
Logic
Power
MOS
Control
Stage
ZCD
RT4803A
VIN
Q3_BYP_MOS VMIN
Control
Q1_UG
VMAX
Control
Q2_LG
VOUT
LX
Discharge
AGND
PGND
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
DS4803A-06 September 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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