Diodes ZXRE160 User Manual

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Description

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ZXRE160

0.6V ENHANCED ADJUSTABLE PRECISION SHUNT REGULATOR

Pin Assignments

The ZXRE160 is a 5-terminal adjustable shunt regulator offering excellent temperature stability and output handling capability. This device offers an enhancement to the ZXRE060 part for use in a comparator mode applications.

In shunt regulator mode, the ZXRE160 simplifies the design of isolated low voltage DC-DC regulators. With its low 0.6V FB pin, it can control the regulation of rails as low 0.6V. This makes the part ideal for state of the art microprocessor, DSP and PLD core voltage POL converters.

The device open-collector output can operate from 0.2V to 18V and regulated output voltage can be set by selection of two external

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divider resistors. Separating the input from the open collector output enables the ZXRE160 to be used to make low-cost low drop-out regulators operating at low input voltages.

The ZXRE160 is available in two grades with initial tolerances of 0.5% and 1% for the A and standard grades respectively. It is available in space saving low profile 5 pin SC70/SOT353, thin TSOT25 and very small DFN1520 packages.

Features

• Low reference voltage (VFB = 0.6V)

• -40°C to +125°C temperature range

• Reference voltage tolerance at +25°C

• 0.5% ZXRE160A

• 1% ZXRE160

• Typical temperature drift

• <4 mV (0°C to +70°C)

• <6 mV (-40°C to +85°C)

• <12mV (-40°C to +125°C)

• 0.2V to 18V open-collector output

• High power supply rejection

• (>45dB at 300kHz)

• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

• Halogen and Antimony Free. “Green” Device (Note 3)

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.

Applications

• Isolated DC-DC converters

• Core voltage POL

• Low Voltage Low-Dropout linear regulators

• Shunt regulators

• Adjustable voltage reference

ZXRE160_H5 (SC70/SOT353) and

ZXRE160_ET5 (TSOT25)

Top viewTop view

ZXRE160_FT4 (X2-DFN1520-6)

Top view

PGND

1

N/C

2

OUT

3

Exposed flag floating or

connect to GND

IN

6

5

GND

4

FB

ZXRE160

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Typical Applications Circuit

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ZXRE160

Pin Descriptions

Package Name

TSOT25

Pin Number

X2-DFN1520-6

Function

Power Ground: Ground return for emitter of output transistor: Connect PGND and GND together.

Output: Connect a capacitor close to device between OUT and GND for closed loop stability. See the Applications Information section.

Analog Ground: Ground return for reference and amplifier: Connect GND and PGND together.

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Pin Name

PGND 1 1

— — 2 No connection

OUT 5 3

FB 4 4 Feedback Input. Threshold voltage 600mV nominal.

GND 2 5

IN 3 6 Supply Input: Connect a 0.1μF ceramic capacitor close to the device from IN to GND. — — Flag Floating or connect to GND

SC70/ SOT353,

ZXRE160

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Functional Block Diagram

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ZXRE160

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The ZXRE160 differs from most other shunt regulators in that it has separate input and output pins and a low voltage reference. This enables it to regulate rails down to 600mV and makes the part ideal for isolated power supply applications that use opto-couplers in the feedback loop and where the open-collector output is required to operate down to voltages as low as 200mV.

The wide input voltage range of 2V to 18V and output voltage range of 0.2V to 18V enables the ZXRE160 to be powered from an auxiliary rail, while controlling a master rail which is above the

auxiliary rail voltage, or below the minimum V allows it to operate as a low-dropout voltage regulator for microprocessor/DSP/PLD cores.

As with other shunt regulators (and shunt references), the ZXRE160 compares its internal amplifier FB pin to a high accuracy internal reference; if FB is below the reference then OUT turns off, but if FB is above the reference then OUT sinks current – up to a maximum of 15mA.

ZXRE160

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voltage. This

IN

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Absolute Maximum Ratings (Voltages to GND, @T

= +25°C, unless otherwise specified.)

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Symbol Parameter Rating Unit

VIN

V

OUT

VFB

P

GND

I

OUT

TJ

TST

These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation at the absolute maximum rating for extended periods may reduce device reliability.

Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices.

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IN Voltage relative to GND 20 V OUT Voltage relative to GND 20 V FB Voltage relative to GND 20 V PGND Voltage relative to GND -0.3 to +0.3 V OUT Pin Current 20 mA Operating Junction Temperature -40 to 150 °C Storage Temperature 55 to 150 °C

Package Thermal Data

P

Package

SC70/SOT353 400°C/W 310mW

TSOT25 250°C/W 500mW

X2-DFN1520-6 TBD TBD

θ

JA

T

= 25°C, TJ = 150°C

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Recommended Operating Conditions (@T

Symbol Parameter Min Max Units

VIN VIN

V

OUT

I

OUT

TA

IN Voltage Range (0 to +125°C) 2 18 IN Voltage Range (-40°C to 0°C) 2.2 18 OUT Voltage Range 0.2 18 OUT Pin Current 0.3 15 mA Operating Ambient Temperature

Range

DIS

= +25°C, unless otherwise specified.)

A

-40 +125 °C

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ZXRE160

V

ZXRE160

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ZXRE160

Electrical Characteristics (@T

T

= +25°C, VIN = 3.3V, V

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Symbol Parameter Conditions Min Typ Max Units

VFB

Feedback voltage

OUT

= VFB, I

OUT

TA = 0°C to +85°C

TA = -40°C to +85°C

= +25°C, VDD = 3V, unless otherwise specified.)

A

= 5mA, unless otherwise specified.) (Note 4)

ZXRE160A 0.597 0.6 0.603 ZXRE160 0.594 0.6 0.606 ZXRE160A 0.595 0.605 ZXRE160 0.592 0.608

ZXRE160A 0.594 0.606 ZXRE160 0.591 0.609

V

TA = -40°C to +125°C

ZXRE160A 0.593 0.607

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FB

LOAD

LINE

OVR

Feedback pin load regulation

Feedback pin line regulation

Output voltage regulation

I

= 1 to 15mA

OUT

= 2V to 18V

V

IN

V

= 2.2V to 18V TA = -40 to +125°C

IN

V

= 0.2V to 18V,

OUT

I

= 1mA

OUT

(Ref. Figure 1)

ZXRE160 0.590 0.610

3.8 6 TA = -40 to +125°C

10

0.3 1

1.5

mV

1 TA = -40 to +125°C

1.5

mV

-45

IFB

IIN

I

OUT(LK)

Z

OUT

PSRR

BW

G

Note: 4. Production testing of the device is performed at +25°C. Functional operation of the device and parameters specified over the operating temperature range are guaranteed by design, characterization and process control.

FB input bias current

Input current

OUT leakage current

Dynamic Output Impedance

Power supply rejection ratio

Amplifier Unity Gain Frequency

Amplifier Transconductance

ZXRE160

Document number: DS35688 Rev. 2 - 2

VIN = 18V

TA = -40 to +125°C

VFB = 0.7V

= 2V to 18V

V

IN

V

= 2.2V to 18V TA = -40 to +125°C

IN

V

= 2V to 18V

IN

V

= 2.2V to 18V TA = -40 to +125°C

IN

V

= 18V, I

V V V

I

IN

IN OUT FB

OUT

= 18V,

=0V

= 1 to 15mA

I

= 0.3mA

OUT

= 10mA

I

OUT

= 0.3mA VFB = 0.7V

f < 1kHz F = 300kHz

V

= 0.3VPP

AC

0.35 0.7

0.48 1

0.1 TA = +125°C

0.25 0.4 TA = -40 to +125°C

Ref: Figure 2

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-200 0

-50 50

1

1.5 3

1

0.6

>45 dB

600 kHz

5000 mA/V

nA

mA

µA

Ω

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