Boost Converter. RT4813A Datasheet

RT4813A Converter. Datasheet pdf. Equivalent

RT4813A Datasheet
Recommendation RT4813A Datasheet
Part RT4813A
Description High Efficiency Boost Converter
Feature RT4813A; RT4813A High Efficiency Boost Converter General Description The RT4813A allows systems to take adv.
Manufacture Richtek
Datasheet
Download RT4813A Datasheet




Richtek RT4813A
RT4813A
High Efficiency Boost Converter
General Description
The RT4813A 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 RT4813A 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 minimum load current of 2.5A. Quiescent
current in Shutdown Mode is less than 1A, which
maximizes battery life.
Ordering Information
RT4813A
Package Type
QUF : UQFN-9L 2x2 (FC) (U-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Features
CMCOT Topology and Small Output Ripple when
VIN Close VOUT Voltage
Operates from a Single Li-ion Cell : 1.8V to 5.5V
Adjustable Output Voltage : 1.8V to 5.5V
PSM Operation
Up to 96% Efficiency
Input Over Current Limit
Input / Output Over Voltage Protection
Average Output Current Limit Range : 3250mA
to 2500mA
Internal Compensation
Output Discharge
Output Short Protection
True Load Disconnect
Applications
Single-Cell Li-Ion, LiFePO4 Smart-Phones
Portable Equipment
Marking Information
3XW
3X : Product Code
W : Date Code
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.
Simplified Application Circuit
L1
VIN
C1
C2
I2C Control
RT4813A
SW VOUT
VIN FB
SCL
SDA
GND
EN
VOUT
R1 C3
R2
EN
R3
Copyright © 2018 Richtek Technology Corporation. All rights reserved.
DS4813A-03 December 2018
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT4813A
RT4813A
Pin Configuration
(TOP VIEW)
EN 1 9 8 VIN
VOUT 2
7 FB
SW 3
6 GND
PGND 4
5 SDA
UQFN-9L 2x2 (FC)
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
Pin Name
EN
VOUT
SW
PGND
SDA
GND
FB
VIN
SCL
Pin Function
Enable input (1 enabled, 0 disabled), must not be left floating.
Boost converter output.
Switching node.
Power ground.
I2C interface data input.
Analog ground.
Voltage feedback.
Power input. Input capacitor CIN must be placed as close to IC as possible.
I2C interface clock input.
Functional Block Diagram
VIN
OCP
Gate
DRV
VOUT
SW
SDA
SCL
EN
PGND
Digital
CTRL
PWM
CTRL
OSC
OTP
UVLO
AMP -
+
VREF
FB
GND
Copyright © 2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS4813A-03 December 2018



Richtek RT4813A
Operation
RT4813A combined built-in power transistors,
synchronous rectification, and low supply current, it
provides a compact solution for system using advanced
Li-Ion battery chemistries.
In boost mode, output voltage regulation is guaranteed to
minimum load current of 2.5A. Quiescent current in
Shutdown mode is less than 1A, which maximizes
battery life.
Mode
LIN 1
LIN
LIN 2
Soft-Start
Boost
Depiction
Linear startup 1
Linear startup 2
Boost soft-start
Boost mode
Condition
VIN > VOUT
VIN > VOUT
VOUT < VOUT(MIN)
VOUT = VOUT(MIN)
LIN State
When VIN is rising, it enters the LIN State. There are
two parts for the LIN state. It provides maximum current
for 1A to charge the COUT in LIN1, and the other one is
for 2A in LIN2. By the way, the EN is pulled high and
VIN > UVLO.
As the figure shown, if the timeout is over the
specification, it will enter the Fault mode.
EN = 1,
Vin > UVLO
LIN 1
Timeout < 512μs Timeout > 512μs
Soft-Start
LIN 2
Timeout
< 1024μs
Timeout > 1024μs
Boost
mode
Fault
State
Figure 1. RT4813A State Chart
RT4813A
Startup and Shutdown State
When VIN is rising and through the LIN state, it will
enter the Startup state. If EN is pulled low, any function
is turned-off in shutdown mode.
Soft-Start State
It starts to switch in Soft-start state. After the LIN state,
output voltage is rising with the internal reference
voltage.
Fault State
As the Figure 1 shown, it will enter to the Fault state as
below,
The timeout of LIN2 is over the 1024s.
It will be the high impedance between the input and
output when the fault is triggered. A restart will be start
after 20ms.
OCP
The converter senses the current signal when the
high-side P-MOSFET turns on. As a result, the OCP is
cycle by-cycle current limitation. If the OCP occurs, the
converter holds off the next on pulse until inductor
current drops below the OCP limit.
OTP
The converter has an over-temperature protection.
When the junction temperature is higher than the
thermal shutdown rising threshold, the system will be
latched and the output voltage will no longer be
regulated until the junction temperature drops under
the falling threshold.
Copyright © 2018 Richtek Technology Corporation. All rights reserved.
DS4813A-03 December 2018
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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