YOBON YB1680 Technical data

YB1680

1.5MHz, 600mA Synchronous Step-Down Converter

Description

The YB1680 is a 1.5MHz constant

frequency, slope compensated current

mode PWM step-down converter. The

device integrates a main switch and a

synchronous rectifier for high efficiency

without an external Schottky diode. It is

ideal for powering portable equipment that

runs from a single cell lithium-Ion (Li+)

battery. The YB1680 can supply 600mA of

load current from a 2.5V to 5.5V input

voltage. The output voltage can be

regulated as low as 0.6V. The YB1680 can

also run at 100% duty cycle for low dropout

operation, extending battery life in portable

system. Idle mode operation at light loads

provides very low output ripple voltage for

noise sensitive applications.

The YB1680 is offered in a low profile 5-pin,

SOT package, and is available in an

adjustable version.

Features

 High Efficiency : Up to 94%  1.5MHz Constant Switching Frequency  600mA Output Current at V  Integrated Main Switch and Synchronous

=3V

IN

Rectifier. No Schottky Diode Required

 2.5V to 5.5V Input Voltage Range  Output Voltage as Low as 0.6V  100% Duty Cycle in Dropout  Low Quiescent Current : 300μA  Slope Compensated Current Mode

Control for Excellent Line and Load Transient Response

 Short Circuit Protection  Thermal Fault Protection  <1μA Shutdown Current  Space Saving 5-Pin SOT23 Package  Pb-free Package

Applications

 Cellular and Smart Phones  Microprocessors and DSP Core Supplies  Wireless and DSL Modems  PDAs  MP3 Player  Digital Still and Video Cameras  Portable Instruments

T ypical Applicatio n Circuit

Figure 1: Typical Application Circuit

YB1680 Rev.1.0 www.yobon.com.tw 1

Pin Configuration

YB1680

1.5MHz, 600mA Synchronous Step-Down Converter

EN

GND

SW

1

2

3

SOT23-5

Figure 2: Pin Configuration

5

4

Pin Description

Table 1

Pin Name Description

Regulator Enable control input. Drive EN above 1.5V to turn on the

1 EN

part. Drive EN below 0.3V to turn it off. In shutdown, all functions are disabled drawing <1μA supply current. Do not leave EN floating.

FB

VIN

2 GND Ground.

Power Switch Output. It is the Switch note connection to Inductor. This

3 SW

4 VIN

5 FB

pin connects to the drains of the internal P-CH and N-CH MOSFET switches.

Supply Input Pin. Must be closely decoupled to GND, Pin 2, with a

2.2μF or greater ceramic capacitor.

VFB (Adjustable Version) : Feedback Input Pin. Connect FB to the center point of the external resistor divider. The feedback threshold voltage is 0.6V.

Ordering Information

Order Number Package Type Supplied As Package Marking

YB1680ST25XADJP SOT23-5 3000 units Tape & Reel A1XY (Note 1)

Note 1: XY = Manufacturing Date Code

YB1680 Rev.1.0 www.yobon.com.tw 2

1.5MHz, 600mA Synchronous Step-Down Converter

Absolute Maximum Ratings

YB1680

Input Supply Voltage................... -0.3V to 6V

EN, VFB Voltage ................ -0.3V to VIN+0.3V

SW, V

Voltage.............. -0.3V to VIN+0.3V

OUT

Peak SW Sink and Source Current........1.5A

Electrical Characteristics

Table 2 (V

Input Voltage Range

Input DC Supply Current Active Mode Shutdown Mode

Regulated Feedback Voltage

VFB Input Bias Current

= V

IN

= 3.6V, TA=25°C, Test Circuit Figure 1, unless otherwise noted.)

RUN

Description Symbol Test Conditions MIN TYP MAX Units

V

IN

I

V

Q

= 0.5V

FB

V

= 0V, VIN = 4.2V

FB

TA = +25℃

V

FB

I

FB

TA = 0℃ ≦ TA ≦ 85℃

T

= -40℃ ≦ TA ≦ 85℃

A

V

= 0.65V

FB

Operating Temperature Range.. -40°C to 85°C

Junction Temperature ....................... 125°C

Storage Temperature Range ... -65°C to 150°C

Lead Temperature (Soldering, 10s) .. 300°C

2.5 5.5 V

270

0.08

0.5880 0.6000 0.6120

0.5865 0.6000 0.6135

0.5850 0.6000 0.6150

400

μA

1.0

V

±30 nA

Reference Voltage Line Regulation

Output Voltage Line Regulation

Output Voltage Load Regulation

Maximum Output Current

Oscillator Frequency

R

of P-CH MOSFET

DS(ON)

of N-CH MOSFET

DS(ON)

Peak Inductor Current

SW Leakage

Output Over Voltage Lockout

EN Threshold

EN Leakage Current

V

= 2.5V to 5.5V,

F

OSC

FB

V

OUT

V

= 2.5V to 5.5V, I

IN

I

OUT

VIN = 3.0V

V

FB

ISW = 300mA

ISW = -300mA

= 3V, V

V

IN

V

OUT

= VFB (R2=0)

OUT

from 0 to 600mA

= 0.6V or V

FB

= 100%

OUT

= 0.5V or

= 90%

= 10mA

0.11 0.63 %/V

0.0015 %/mA

600 mA

1.2 1.5 1.8 MHz

0.30 0.50 Ω

0.20 0.45 Ω

1.20 A

Duty Cycle < 35%

= 0V, V

V

RUN

V

= 5V

IN

ΔV

= V

OVL

-40℃ ≦ T

V

EN

I

EN

= 0V or 5V,

SW

- VFB

OVL

≦ 85℃

A

±0.01 ±1 μA

60 mV

0.3 0.45 1.30 V

±0.1 ±1 μA

YB1680 Rev.1.0 www.yobon.com.tw 3