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OCP2183
Low-Cost, 3A, 4.5V to 24V Input, 360kHz, PWM Step-Down
Synchronous Rectified DC-DC Regulator
General Description
The OCP2183 is a low-cost, synchronous DC-DC
converter with internal switches delivers an output current
up to 3A. The OCP2183 operates from an input voltage of
4.5V to 24V and provides an adjustable output voltage
from 0.920V to 20V, set with two external resistors. The
OCP2183 is idea for distributed power systems,
pre-regulation, set-top boxes, television, and other
consumer application.
The OCP2183 features a peak-current-mode PWM
controller with internally fixed 390kHz switching
frequency and a 90% maximum duty cycle. The
current-mode control architecture simplifies
compensation design, and ensures a cycle-by-cycle
current limit and fast response to line and load transients.
This synchronous buck regulator features internal
MOSFETs that provide better efficiency than
asynchronous solutions, while simplifying the design
relative to discrete controller solutions. In addition to
simplifying the design, the integrated MOSFETs minimize
EMI, reduce board space, and provide higher reliability by
minimizing the number of external components.
Fault protection includes cycle-by-cycle current limit,
input UVLO, output over voltage protection and thermal
shutdown. Besides, adjustable soft-start function
prevents inrush current at turn-on. This device uses
current mode control scheme that provides fast transient
response. In shutdown mode, the supply current is about
1uA.
The OCP2183 is available in an SOP8L-EP
package, and it is RoHS compliant. It provides a very
compact system solution and good thermal
conductance, with minimum number of readily available
standard external components. Operating temperature
range of the OCP2183 is from -40°C to 85°C.
Features
Wide Supply Voltage Range: 4.5V ~ 24V
Up to 3A of Continuous Output Current
Adjustable Output Voltage Range from 0.920V to
20V
Current Mode Control
Integrated 85mΩ Power MOS Switches
Fixed 390kHz Switching Frequency
Up to 95% Efficiency
Programmable Soft-Start
Stable with Low-ESR Ceramic Output Capacitors
Safe Startup into Pre-biased Output
Fully Protected Against OCP, OVP and OTP
Cycle-By-Cycle Over-current Protection
Input Under-voltage Lock-out
Output Over-Voltage Protection
Short Circuit Frequency 130KHz
Low Standby current
TA= -40 ~ 85
Available in SOP-8L-EP Package
RoHS Compliant and Pb-free
Applications
Industrial and Commercial Low Power Systems
LCD Monitors and TVs
Green Electronics/applications
Notebook Computers
Point of load regulation of high-performance
DSP, FPGAs and ASICs
Set Top Boxes
DVD, LCD Displays
Distributed Power System
Datacom, XDSL
Consumer Products
Pin Configuration
SOP-8L-EP (Top View)
Figure 1, Pin Assignments of OCP2183
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OCP2183
Pin
Name
Pin No.
SOP8L-EP
I/O
Pin Function
BS 1
VIN 2
SW 3
GND 4, 9 (EP)
FB 5
COMP
6
EN 7
SS 8
I/O
High-side MOSFET Drive Supply. Bypass BS to SW with a 10nF or greater
capacitor to power the high side switch.
P
Input Power. Input supply range is from 4.5V to 24V. About the bypass
capacitor, see Input Capacitor.
Power Switching Output. SW is the switching node that supplies power to
the output. Connect the output LC filter from SW to the output load. Note
O that a capacitor is required from SW to BS to power the high-side switch.
SW is high impedance when the IC is in shut-down mode, thermal
shutdown mode, or VIN is below the UVLO threshold.
P Ground (Connect the exposed pad to Pin 4)
Feedback Input. FB senses the output voltage and regulates it. Drive FB
with a resistive voltage divider connected to it from the output voltage. The
I
feedback threshold is 0.920V typically. See Setting the Output Voltage.
When the FB pin voltage exceeds 20% of the nominal regulation value of
0.920V, the over voltage comparator is tripped and the COMP pin and the
SS pin are discharged to GND, forcing the high-side switch off.
Compensation Node, Voltage Error-Amplifier Output. COMP is used to
O
compensate the regulation control loop. Connect a series RC network from
COMP to GND. In some cases, an additional capacitor from COMP to GND
is required. See Compensation Components.
Enable Input. A logic high enable the converter, a logic low forces the
I
converter into shutdown mode reducing the supply current to less than
3uA. For automatic startup, connect this pin to VIN with a 100kΩ pull up
resistor.
Soft-Start Control Input. SS controls the soft-start period. Connect a
I
capacitor from SS to GND to set the soft-start period. A 0.1μF capacitor
sets the soft-start period to 15ms. To disable the soft-start feature, leave
SS unconnected.
Typical Application Circuit
Figure 2, Typical Application Circuit of OCP2183
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OCP2183
Ordering Information
OCP2183XXX
Package
ES:SOP8L-EP
Packing
Blank:Tube or Bulk
A:Tape&Reel
Temperature Grade
D: -40°C~85°C
Part Number Package Type
OCP2183ESD
SOP-8L
Package Qty
13-in reel 2500pcs/reel
Temperature
-4085
Eco Plan
Green
Lead
Cu
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Rev. 1.2 Feb .27, 2018
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