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SY8201 Rev0[1].2

SY8201

High Efficiency Fast Response, 1A, 27V Input

Synchronous Step Down Regulator

Preliminary Specification

General Description

SY8201 develops high efficiency synchronous step-down DC-DC converter capable of delivering 1A . SY8201 operates over a wide input voltage range from 4.5V to 27V and integrate main switch and

synchronous switch with very low R DS(ON) to minimize the conduction loss.

SY8201 adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 500 kHz under heavy load conditions to minimize the size of inductor and capacitor.

Ordering Information

Temperature Code SY8201Package Code Optional Spec Code □(□□)□

Temperature Range: -40°C to 85°C

Features

? Low R DS(ON) for internal switches (top/bottom):350/150 m? ? 4.5-27V input voltage range

? Instant PWM architecture to achieve fast transient responses Internal softstart limits the inrush current ? 2% 0.6V reference

? RoHS Compliant and Halogen Free ? Compact package: SOT23-6

Applications

? Set Top Box ? Portable TV

? Access Point Router ? DSL Modem ? LCD TV

Typical Applications

2

E f f i c i e n c y (%)

Load Current (A)

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

Ordering Number Package type Note SY8201ABC

SOT23-6

--

SY8201

Pinout (top view)

(SOT23-6)

Top Mark: EN xyz , (Device code: EN, x=year code, y=week code, z= lot number code )

Pin Name Pin Number

Pin Description

BS 1 Boot-Strap Pin. Supply high side gate driver. Decouple this pin to LX pin with 0.1uF ceramic cap. GND 2 Ground pin

FB 3 Output Feedback Pin. Connect this pin to the center point of the output resistor divider (as shown in Figure 1) to program the outpu Vout=0.6*(1+R1/R2)

EN 4 Enable control. Pull high to turn on. Do not float.

IN 5 Input pin. Decouple this pin to GND pin with at least 1uF ceramic cap LX 6

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

Absolute Maximum Ratings (Note 1)

Supply Input Voltage ----------------------------------------------------------------------------------------- 30V

LX, EN Voltage------------------------------------------------------------------------------------------------ V IN + 0.3V FB, BS-LX Voltage--------------------------------------------------------------------------------------------- 4V Power Dissipation, P D @ T A = 25°C SOT23-6, ----------------------------------------------------------- 0.6W Package Thermal Resistance (Note 2)

θJA ---------------------------------------------------------------------------------------------------- 250°C/W θJC ---------------------------------------------------------------------------------------------------- 130°C/W

Junction Temperature Range -------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------- 260°C

Storage Temperature Range --------------------------------------------------------------------------------- -65°C to 150°C Dynamic LX voltage in 50ns duration ---------------------------------------------------------------------IN+3V to GND-4V

Recommended Operating Conditions (Note 3)

Supply Input Voltage ----------------------------------------------------------------------------------------- 4.5V to 27V Junction Temperature Range -------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------- -40°C to 85°C

SY8201

Electrical Characteristics

(V IN= 12V, V OUT= 1.2V, L = 2.2uH, C OUT= 10uF, T A= 25°C, I OUT= 1A unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit Input Voltage Range V IN 4.5 27 V Quiescent Current I Q I OUT=0, V FB=V REF×105% 400 μA

Shutdown Current I SHDN EN=0 5 10 μA

Feedback Reference Voltage V REF

0.588 0.6 0.612

FB Input Current I FB V FB=V IN-50 50 nA Top FET RON R DS(ON)10.35 ? Bottom FET RON R DS(ON)20.15 ? Bottom FET Valley

Current Limit

I LIM 1.5 A EN Rising Threshold V ENH 1.5 V

EN Falling Threshold V ENL0.4 V Input UVLO Threshold V UVLO 4.5 V UVLO Hysteresis V HYS0.4 V On Time T ON V IN= 12V ,V OUT=1.2V,I OUT= 1A200 ns Min ON Time 50 ns Min Off Time 100 ns

Thermal Shutdown Temperature T SD

150 °C

Thermal Shutdown Hysteresis T HYS

15 °C

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.

Note 2: θJA 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 SOT23-6 packages is the case position for θJC 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.

SY8201

SOT23-6 Package Outline & PCB layout

2.40

0.50

Recommended Pad Layout Top View

Notes: All dimension in MM

All dimension do not include mold flash & metal burr

SY8201

Reel

Width

Taping & Reel Specification

1.SOT23-6 taping orientation

Feeding direction

2.Carrier Tape & Reel specification for packages

Package

types

Tape width

(mm)

Pocket

pitch(mm)

Reel size

(Inch)

Reel

width(mm)

Trailer

length(mm)

Leader length

(mm)

Qty per

reel SOT23-6 8 4 7" 8.4 280 160 3000 3.Others: NA

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