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  Richtek Technology Electronic Components Datasheet  

RT2856 Datasheet

Synchronous Step-Down Converter

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®
RT2856
6A, 18V, Synchronous Step-Down Converter
General Description
The RT2856 is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 6A output
current from a 4.5V to 18V input supply. The RT2856
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.
Features
Low RDS(ON) Power MOSFET Switches 26mΩ/19mΩ
Input Voltage Range : 4.5V to 18V
Adjustable Switching Frequency : 200kHz to 1.6MHz
Current-Mode Control
Synchronous to External Clock : 200kHz to 1.6MHz
Accurate Voltage Reference 0.8V ± 1%, Over 40°C
to 85°C
Monotonic Start-Up into Pre-biased Outputs
Adjustable Soft-Start
Power Good Indicator
Under-Voltage and Over-Voltage Protection
Input Under-Voltage Lockout
RoHS Compliant and Halogen Free
Marking Information
00= : Product Code
00=YM
DNN
YMDNN : Date Code
Applications
High Performance Point of Load Regulation
Notebook Computers
High Density and Distributed Power Systems
Simplified Application Circuit
VIN
Enable
PGOOD
CIN
ROSC
CSS
RT2856
VIN BOOT
PVIN
LX
EN
PGOOD
FB
COMP
RT/SYNC
SS/TR
GND
CBOOT
L
RCOMP1
CCOMP2
R1
CCOMP1 R2
VOUT
COUT
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS2856-09 July 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT2856 Datasheet

Synchronous Step-Down Converter

No Preview Available !

RT2856
Ordering Information
RT2856
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.
Pin Configurations
(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.
Pin Name
Pin Function
Oscillator Resistor and External Frequency Synchronization Input. Connecting a
1 RT/SYNC resistor from this pin to GND sets the switching frequency or connecting an
external clock to this pin changes the switching frequency.
2, 3,
15 (Exposed Pad)
GND
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.
4, 5
PVIN
Power Input. Supplies the power switches of the device.
6
7
8
9
10
11, 12
13
14
VIN
FB
COMP
SS/TR
EN
LX
BOOT
PGOOD
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 ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2856-09 July 2015


Part Number RT2856
Description Synchronous Step-Down Converter
Maker Richtek
Total Page 19 Pages
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