Step-Down Converter. RT2852BH Datasheet


RT2852BH Converter. Datasheet pdf. Equivalent


Part Number

RT2852BH

Description

Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 19 Pages
Datasheet
Download RT2852BH Datasheet


RT2852BH
®
RT2852BH
3A, 18V, Synchronous Step-Down Converter
General Description
The RT2852BH is a high efficiency, monolithic
synchronous step-down DC-DC converter that can deliver
up to 3A output current from a 4.5V to 18V input supply.
The RT2852BH current-mode architecture with external
compensation allows the transient response to be
optimized over a wide range of loads and output capacitors.
Cycle-by-cycle current limit provides protection against
shorted outputs and soft-start eliminates input current
surge during start-up. Fault condition protections include
output under-voltage protection, output over-voltage
protection, and over-temperature protection. The low
current shutdown mode provides output disconnection,
enabling easy power management in battery-powered
systems.
Applications
High Performance Point of Load Regulation
Notebook Computers
High Density and Distributed Power Systems
Features
Low RDS(ON) Power MOSFET Switches 46mΩ/36mΩ
Input Voltage Range : 4.5V to 18V
Adjustable Switching Frequency : 200kHz to 1.2MHz
Current-Mode Control
Synchronous to External Clock : 200kHz to 1.2MHz
Accurate Voltage Reference 0.8V ± 1.25%, Over
40°C to 105°C
Monotonic Start-Up into Pre-biased Outputs
Adjustable Soft-Start
Power Good Indicator
Under-Voltage and Over-Voltage Protection
Input Under-Voltage Lockout
Ordering Information
RT2852BH
Package Type
QW : WQFN-14AL 3.5x3.5 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Simplified Application Circuit
VIN
Enable
PGOOD
CIN
ROSC
CSS
RT2852BH
VIN BOOT
PVIN
LX
EN
PGOOD
FB
COMP
RT/SYNC
SS/TR
GND
CBOOT
L
RCOMP1
CCOMP2
R1
CCOMP1 R2
VOUT
COUT
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
DS2852BH-01 June 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT2852BH
RT2852BH
Marking Information
0N= : Product Code
0N=YM
DNN
YMDNN : Date Code
Pin Configuration
(TOP VIEW)
GND
GND
PVIN
PVIN
VIN
2
3
4
5
6
1 14
GND
15
13 BOOT
12 LX
11 LX
10 EN
9 SS/TR
78
WQFN-14AL 3.5x3.5
Functional Pin Description
Pin No.
1
2, 3,
15 (Exposed Pad)
4, 5
6
7
8
9
10
11, 12
13
14
Pin Name
RT/SYNC
GND
PVIN
VIN
FB
COMP
SS/TR
EN
LX
BOOT
PGOOD
Pin Function
Oscillator resistor and external frequency synchronization input. Connecting a
resistor from this pin to GND sets the switching frequency or connecting an
external clock to this pin changes the switching frequency.
System ground. Provide the ground return path for the control circuitry and
low-side power MOSFET. The exposed pad must be soldered to a large PCB
and connected to GND for minimum power dissipation.
Power input. Supplies the power switches of the device.
Supply voltage input. Supplies the control circuitry and internal reference of the
device.
Feedback voltage input. This pin is used to set the desired output voltage via an
external resistive divider. The feedback reference voltage is 0.8V typically.
Compensation node. The current comparator threshold increases with this
control voltage. Connect external compensation elements to this pin to stabilize
the control loop.
Soft-start and tracking control input. Connect a capacitor from SS to GND to set
the soft-start period. The soft-start period can be used to track and sequence
when the external voltage on this pin overrides the internal reference.
Enable control input. Floating this pin or connecting this pin to logic high can
enable the device and connecting this pin to GND can disable the device.
Switch node. LX is the switching node that supplies power to the output and
connect the output LC filter from LX to the output load.
Bootstrap supply for high-side gate driver. Connect a 100nF or greater capacitor
from LX to BOOT to power the high-side switch.
Power good indicator output. This pin is an open-drain logic output that is pulled
to ground when the output voltage is lower or higher than its specified threshold
under the conditions of OVP, OTP, dropout, EN shutdown, or during slow start.
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2852BH-01 June 2019


Features ® RT2852BH 3A, 18V, Synchronous Step-D own Converter General Description The RT2852BH is a high efficiency, monolith ic synchronous step-down DC-DC converte r that can deliver up to 3A output curr ent from a 4.5V to 18V input supply. Th e RT2852BH current-mode architecture wi th external compensation allows the tra nsient response to be optimized over a wide range of loads and output capacito rs. Cycle-by-cycle current limit provid es protection against shorted outputs a nd soft-start eliminates input current surge during start-up. Fault condition protections include output under-voltag e protection, output over-voltage prote ction, and over-temperature protection. The low current shutdown mode provides output disconnection, enabling easy po wer management in battery-powered syste ms. Applications  High Performance P oint of Load Regulation  Notebook Co mputers  High Density and Distribute d Power Systems Features  Low RDS(O N) Power MOSFET Switches 46mΩ/36mΩ  Input Voltage Range : 4.5V to 18V .
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