SC220EVB Semtech, SC220EVB Datasheet

SC220EVB

Manufacturer Part Number

SC220EVB

Description

SC220 20 MHz Step-Down Regulator (SOIC-8) Evaluation Board

Manufacturer

Semtech

Datasheet

1.SC220STRT.pdf (14 pages)

Current page: 1 of 14
Download datasheet (359Kb)

POWER MANAGEMENT

Features



Applications



Typical Application Circuit

January 25, 2012

Patented X-EMI

Effi ciency up to 90%

19μA Quiescent Current under Very Light-load

Wide Input Voltage Range — 2.7V to 5.5V

Adjustable Output Voltage Down to 1.0V

Output DC Current — up to 650mA

High Light-load Effi ciency via Automatic PSAVE Mode

Ultra-fast Transient Response — <1μs

Temperature Range — -40 to +85°C

Shutdown Current — 0.1μA (typical)

Requires Tiny 220nH Inductor

Requires Only 1μF of Output Capacitance

External Switching Frequency Synchronization

Protection Features Including

Off ered in SOIC 8 Lead Package

Lead-free, Halogen-free, and RoHS/WEEE Compliant

HDTV, Set Top Boxes, Gaming Consoles

POL Applications

White Goods

Automotive (EMI sensitive console applications)



Enables Trace Inductors in PC Board Material

Excellent EMI Performance

Over-Current Protection

Output Short-Circuit Protection

Thermal Shutdown Protection

Inductor Technology

E n a b le

2.7 ~ 5.5 V

1 μF

P V IN

A V IN

E N

P G N D

A G N D

SC220

Synchronous Step-Down Regulator

Description

The SC220 is a 20MHz X-EMI™

lator optimized for powering low voltage rails from 2.7 to

5.5V input voltage. X-EMI™ inductor technology enables

inductors to be drawn directly on the PC board. This tech-

nology meets or exceeds the EMI performance of chip

inductors and eliminates the need for discrete inductors.

The SC220 uses a unique constant frequency, self-oscil-

lating control loop architecture to provide excellent

transient performance. Under light load condition, the

device operates in Power Save Mode (PSAVE) and main-

tains a typical quiescent current of 19μA. At moderate to

heavy loads, this part operates in PWM mode with a con-

stant switching frequency of 20MHz. This high switching

frequency off ers the advantages of using small and low

cost external components like a 1μF external capacitor

and a small 220nH inductor (including X-EMI

inductors).

The device provides adjustable output voltages down to

1.0V and an output current up to 650mA. An EN pin can

be used to synchronize to an external source and includes

de-glitching to reduce noise sensitivity.

The SC220 is available in SOIC 8 lead package.

Note 1: Purchase of SC220 includes royalty-free rights to use X-EMI

inductor technology with no additional cost.

V O U T

20MHz, 650mA, X-EMI

S W

F B

L , 2 2 0n H

u p to 6 5 0m A

O U T

= 1.8 V

1 μF

O U T

(1)

-enabled step-down regu-

™

-Enabled

SC220

PCB trace

Related parts for SC220EVB

SC220EVB Summary of contents

Page 1

POWER MANAGEMENT Features  Patented X-EMI TM Inductor Technology  Enables Trace Inductors in PC Board Material  Excellent EMI Performance  Effi ciency up to 90%  19μA Quiescent Current under Very Light-load  Wide Input Voltage Range — ...

Page 2

... Date Code xxxxx = Semtech Lot Number Ordering Information SC220STRT Notes (1) Available in tape and reel only. A reel contains 2,500 devices. (2) Device is lead-free, halogen-free, and RoHS/WEEE compliant. Device Package (1)(2) SOIC 8 Lead SC220EVB Evaluation Board SC220 2 ...

Page 3

Absolute Maximum Ratings AVIN, PVIN ( ...

Page 4

Electrical Characteristics (continued) Unless otherwise specifi ed: AVIN = PVIN = EN = 3.6V, C and maximum values. Parameter Feedback Leakage Current ENABLE EN Input High Voltage Threshold EN Input “Low” Voltage Threshold EN Input High Current EN Input Low ...

Page 5

Pin Descriptions Pin # Pin Name Pin Function 1 SW Switching output node — connect to the output LC fi lter. 2 PVIN Power input supply voltage (2.7V to 5.5V). 3 VOUT Input for sensing the output ...

Page 6

Typical Characteristics Effi ciency vs. Load Current V = 1.8V OUT 100 % 3. 0.01 ...

Page 7

Typical Characteristics (Continuous) Load Transient Response V = 3.7V 2.0V 0mA - 650mA IN OUT OUT V (ac coupled) OUT 100mV/div. I OUT 200mA/div. Time (1μs/div) Steady State Operation ( 3.6V 1.8V, ...

Page 8

Typical Characteristics (Continuous) Start-up Operation V = 3.7V 1.8V 10mA IN OUT OUT EN 5V/div 2V/div. V OUT 1V/div. I OUT 10mA/div. Time (20μs/div) Start-up Operation V = 3.7V 1.8V ...

Page 9

Applications Information Applications Information General Description The SC220 is a step-down regulator capable of delivering a lower voltage from an input supply voltage of 2.7V to 5.5V with high effi ciency. Using a unique control architec- ture, the SC220 is ...

Page 10

Applications Information (Cont.) dition. When the current fl owing through the high-side PMOS switch exceeds the current limit, the PMOS switch is turned off . The high-side switch is then held off for a period suffi cient to allow inductor ...

Page 11

Applications Information (Cont.) PCB Layout Considerations PCB Layout is important in designing a switching regula- tor. A few fundamental layout considerations will help to achieve the specified performance. Poor layout can degrade the performance of the switching regulator and may ...

Page 12

Outline Drawing — SOIC 8 Lead ccc aaa ...

Page 13

Land Pattern —SOIC 8 Lead ...

Page 14

... IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its offi cers, employees, subsidiaries, affi liates, and distributors harmless against all claims, costs damages and attorney fees which could arise. ...

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