SY8009A datasheet

SY8009A/SY8009B

Ordering Information

SY8009 □(□□

High Efficiency 1.5MHz/1MHz, 1.5A/2A

Synchronous Step Down Regulator

General Description

The SY8009A and SY8009B are high-efficiency, high frequency synchronous step-down DC-DC regulator

ICs capable of delivering up to 1.5A/2A output currents. The SY8009 family operate over a wide input voltage range from 3V to 5.5V and integrate main switch and synchronous switch with very low R

DS(ON) to minimize the conduction loss.

Low output voltage ripple and small external inductor and capacitor sizes are achieved with greater than

1MHz switching frequency.

Features

•

Low R

DS(ON)

for internal switches (top/bottom)

•

SY8009A: 180mΩ/120mΩ, 1.5A, SOT23-5

•

SY8009B:100mΩ/80mΩ,2.0A

SOT23-6, SSOT23-6

•

3-5.5V input voltage range

•

High switching frequency minimizes the external components

•

SY8009A: 1.5MHz

•

SY8009B: 1MHz

•

Internal softstart limits the inrush current

•

100% dropout operation

•

RoHS Compliant and Halogen Free

•

Compact package: SOT23-5, SOT23-6 and Super

SOT23-6 are pin-compatible. Other packages are available upon requests

Temperature Range: 40°C to 85°C

Ordering Number Package type

SY8009AAAC SOT23-5

SY8009BABC

SY8009BEBC

SOT23-6

SSOT23-6

Note

①

1.5A

2A

2A

Applications

•

LCD TV

•

Set Top Box

•

Net PC

•

Mini-Notebook PC

•

Access Point Router

Typical Applications

96

V

OUT

=1.8V

94

ON/ OFF

V

IN

C

IN

92

EN

L

V

OUT

90

IN LX

88

R

1

C

1

(opt.) 86

GND FB

R

2

C

OUT 84

82

V

IN

=3.3V

V

IN

=4.2V

V

IN

=5.5V

80

0 0.4

0.8

1.2

Load Current (A)

1.6

Figure 1.Schematic diagram Figure 2. Efficiency vs Load Current

2

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SY8009A/SY8009B

Pinout (top view)

EN 1 6 FB

GND 2 5 NC

LX 3 4

SOT23-5(SY8009A) SOT23-6(SY8009B) SSOT23-6(SY8009B)

Part Number Package type Top Mark

①

Pin Name

EN

GND

LX

IN

FB

IN

SY8009AAAC SOT23-5 ADxyz

SY8009BABC SOT23-6 CUxyz

SY8009BEBC

Pin Number

SSOT23-6

Note①

： x=year code, y=week code, z= lot number code.

ASxyz

Pin Description

1

2

3

4

6

Enable control. Pull high to turn on. Do not float.

Ground pin

Inductor pin. Connect this pin to the switching node of inductor.

Input pin. Decouple this pin to GND pin with at least 1uF ceramic cap.

Output Feedback Pin. Connect this pin to the center point of the output resistor divider (as shown in Figure 1) to program the output voltage:

Vout=0.6*(1+R

1

/R

2

).

Absolute Maximum Ratings

(Note 1)

Supply Input Voltage ------------------------------------------------------------------------------------------ 6.0V

Enable, FB Voltage--------------------------------------------------------------------------------------------- V

IN

+ 0.6V

Power Dissipation, P

D

@ T

A

= 25°C,

SOT23-5, SOT23-6, SSOT23-6 -------------------------------------------------------------------- 0.6W

Package Thermal Resistance (Note 2)

SOT23-5, SOT23-6, SSOT23-6, θ

JA

-------------------------------------------------------------- 170°C/W

SOT23-5, SOT23-6, SSOT23-6, θ

JC

---------------------------------------------------------------130°C/W

Junction Temperature Range ----------------------------------------- -----------------------------------------125°C

Lead Temperature (Soldering, 10 sec.) ---------------------------------------------------------------------- 260°C

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

ESD Susceptibility (Note 2)

HBM (Human Body Mode) ----------------------------------------------------------------------------------- 2kV

MM (Machine Mode) ------------------------------------------------------------------------------------------ 200V

Dynamic LX voltage in 50ns duration --------------------------------------------------------------------- IN+3V to GND-4V

Recommended Operating Conditions

(Note 3)

Supply Input Voltage ------------------------------------------------------------------------------------------3V to 5.5V

Junction Temperature Range -------------------------------------------------------------------------------- 40°C to 125°C

Ambient Temperature Range -------------------------------------------------------------------------------- 40°C to 85°C

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SY8009A/SY8009B

Electrical Characteristics

(V

IN

= 5V, V

OUT

= 2.5V, L = 2.2uH, C

OUT

= 10uF, T

A

= 25°C, unless otherwise specified)

Parameter Symbol Test Conditions

Input Voltage Range

Quiescent Current

Shutdown Current I

SHDN

Feedback Reference Voltage V

REF

FB Input Current

PFET RON

NFET RON

PFET Current Limit

V

IN

I

Q

I

I

FB

R

R

DS(ON)

,

P

DS(ON)

LIM

,

N

I

OUT=

0

,

V

FB

=V

REF

⋅

105%

EN=0

V

FB

=V

IN

SY8009A

SY8009B

SY8009A

SY8009B

SY8009A

SY8009B

Min Typ Max Unit

3

µA

0.588 0.6 0.612 V

-50

1.8

2.5

80

0.1

180

100

120

80

5.5

1

50

V

µA nA mΩ mΩ mΩ mΩ

A

EN rising threshold

EN falling threshold

Input UVLO threshold

UVLO hysteresis

Oscillator Frequency

V

ENH

V

ENL

V

UVLO

V

HYS

F

OSC

I

OUT

=200mA, SY8009A

I

OUT

=500mA, SY8009B

1.5

0.1

1.5

1

0.4

2.7

Min ON Time

Max Duty Cycle

Thermal Shutdown

Temperature

T

SD

100

50

160

Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device.

These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability.

A

V

V

V

V

MHz

MHz ns

%

°C

Note 2: θ JA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Pin 2 of SOT23-5/SSOT-23-6 packages is the case position for θ JC measurement. Test condition: Device mounted on 2” x 2” FR-4 substrate PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane

Note 3: The device is not guaranteed to function outside its operating conditions.

SY8009A/B Rev1.0 Silergy Corp. Confidential- Prepared for Customer Use Only 3

SY8009A/SY8009B

SOT23-5 Package outline & PCB layout design

Recommended Pad Layout

Notes: All dimensions are in millimeters.

All dimensions don’t include mold flash & metal burr.

SY8009A/B Rev1.0 Silergy Corp. Confidential- Prepared for Customer Use Only 4

SY8009A/SY8009B

SOT23-6 Package outline & PCB layout design

Recommended Pad Layout

0.60

Notes: All dimensions are in millimeters.

All dimensions don’t include mold flash & metal burr.

SY8009A/B Rev1.0 Silergy Corp. Confidential- Prepared for Customer Use Only 5

SY8009A/SY8009B

SSOT23-6 Package outline & PCB layout design

Recommended Pad Layout

0.60

0.25 - 0.40

Notes: All dimensions are in millimeters.

All dimensions don’t include mold flash & metal burr.

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