ZXRE160
Document number: DS35688 Rev. 2 - 2 1 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
0.6V ENHANCED ADJUSTABLE PRECISION SHUNT REGULATOR
Description
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
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)
Pin Assignments
ZXRE160_H5 (SC70/SOT353) and
ZXRE160_ET5 (TSOT25)
ZXRE160_FT4 (X2-DFN1520-6)
Applications
• Isolated DC-DC converters
• Core voltage POL
• Low Voltage Low-Dropout linear regulators
• Shunt regulators
• Adjustable voltage reference
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.
Top viewTop view
1
2
34
5
6
PGND
N/C
OUT FB
GND
IN
Exposed flag floating or
connect to GND
Top view
1
2
34
5
6
PGND
N/C
OUT FB
GND
IN
Exposed flag floating or
connect to GND
Top view
ZXRE160
Document number: DS35688 Rev. 2 - 2 2 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Typical Applications Circuit
Pin Descriptions
Pin Name
Package Name
Pin Number Function
SC70
/
SOT353,
TSOT25 X2-DFN1520-6
PGND 1 1
Power Ground: Ground return for emitter of output transistor: Connect PGND and
GND together.
— — 2 No connection
OUT 5 3
Output: Connect a capacitor close to device between OUT and GND for closed loop
stability. See the Applications Information section.
FB 4 4 Feedback Input. Threshold voltage 600mV nominal.
GND 2 5
Analog Ground: Ground return for reference and amplifier: Connect GND and PGND
together.
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
ZXRE160
Document number: DS35688 Rev. 2 - 2 3 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Functional Block Diagram
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 VIN voltage. This
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 ref er ence then OUT
turns off, but if FB is above the reference then OUT sinks current
– up to a maximum of 15mA.
ZXRE160
Document number: DS35688 Rev. 2 - 2 4 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Absolute Maximum Ratings (Voltages to GND, @TA = +25°C, unless otherwise specified.)
Symbol Parameter Rating Unit
VIN IN Voltage relative to GND 20 V
VOUT OUT Voltage relative to GND 20 V
VFB FB Voltage relative to GND 20 V
PGND PGND Voltage relative to GND -0.3 to +0.3 V
IOUT OUT Pin Current 20 mA
TJ Operating Junction Temperature -40 to 150 °C
TST Storage Temperature 55 to 150 °C
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.
Package Thermal Data
Package θJA PDIS
TA = 25°C, TJ = 150°C
SC70/SOT353 400°C/W 310mW
TSOT25 250°C/W 500mW
X2-DFN1520-6 TBD TBD
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Min Max Units
VIN IN Voltage Range (0 to +125°C) 2 18
V
VIN IN Voltage Range (-40°C to 0°C) 2.2 18
VOUT OUT Voltage Range 0.2 18
IOUT OUT Pin Current 0.3 15 mA
TA Operating Ambient Temperature
Range -40 +125 °C
ZXRE160
Document number: DS35688 Rev. 2 - 2 5 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Electrical Characteristics (@TA = +25°C, VDD = 3V, unless otherwise specified.)
TA = +25°C, VIN = 3.3V, VOUT = VFB, IOUT = 5mA, unless otherwise specified.) (Note 4)
Symbol Parameter Conditions Min Typ Max Units
VFB Feedback voltage
ZXRE160A 0.597 0.6 0.603
V
ZXRE160 0.594 0.6 0.606
TA = 0°C to +85°C ZXRE160A 0.595 0.605
ZXRE160 0.592 0.608
TA = -40°C to +85°C ZXRE160A 0.594 0.606
ZXRE160 0.591 0.609
TA = -40°C to +125°C ZXRE160A 0.593 0.607
ZXRE160 0.590 0.610
FBLOAD Feedback pin load
regulation IOUT = 1 to 15mA 3.8 6
mV
TA = -40 to +125°C 10
FBLINE Feedback pin line
regulation VIN = 2V to 18V 0.3 1
mV
VIN = 2.2V to 18V TA = -40 to +125°C 1.5
FBOVR Output voltage
regulation
VOUT = 0.2V to 18V,
IOUT = 1mA
(Ref. Figure 1)
1
mV
TA = -40 to +125°C 1.5
IFB FB input bias current VIN = 18V -45 nA
TA = -40 to +125°C -200 0
VFB = 0.7V -50 50
IIN Input current
VIN = 2V to 18V IOUT = 0.3mA 0.35 0.7
mA
VIN = 2.2V to 18V TA = -40 to +125°C 1
VIN = 2V to 18V IOUT = 10mA 0.48 1
mA
VIN = 2.2V to 18V TA = -40 to +125°C 1.5
VIN = 18V, IOUT = 0.3mA VFB = 0.7V 3
IOUT(LK) OUT leakage current VIN = 18V,
VOUT = 18V,
VFB =0V
0.1
µA
TA = +125°C 1
ZOUT Dynamic Output
Impedance IOUT = 1 to 15mA
f < 1kHz 0.25 0.4
Ω
TA = -40 to +125°C 0.6
PSRR Power supply rejection
ratio F = 300kHz
VAC = 0.3VPP >45 dB
BW Amplifier Unity Gain
Frequency Ref: Figure 2 600 kHz
G Amplifier
Transconductance 5000 mA/V
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.
ZXRE160
Document number: DS35688 Rev. 2 - 2 7 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Typical Operating Characteristics
Figure 2. Test Circuits for Gain and Phase Plots
Gain and Phase vsFrequency, VOU
T
=0.6V
-50
0
50
100
150
200
1 10 100 1k 10k 100k 1M
Frequen cy (Hz)
Gain (dB )
0
45
90
135
180
225
Phase (deg)
Gain
Phase
VOUT = 0.6V
COUT = 2.2uF
Gain and Phase vsFrequency, VOU
T
=0.6V
-50
0
50
100
150
200
1 10 100 1k 10k 100k 1M
Frequen cy (Hz)
Gain (dB )
0
45
90
135
180
225
Phase (deg)
Gain
Phase
Gain
Phase
VOUT = 0.6V
COUT = 2.2uF
Gain and Phase vsFrequency, V
OU
T=6V
-50
0
50
100
150
200
1 10 100 1k 10k 100k 1M
Frequency (Hz)
Gain (dB)
0
45
90
135
180
225
Phase (deg)
VOUT = 6 V
COUT = 0.22uF
Gain
Phase
Gain and Phase vsFrequency, V
OU
T=6V
-50
0
50
100
150
200
1 10 100 1k 10k 100k 1M
Frequency (Hz)
Gain (dB)
0
45
90
135
180
225
Phase (deg)
VOUT = 6 V
COUT = 0.22uF
Gain
Phase
Gain
Phase
ZXRE160
Document number: DS35688 Rev. 2 - 2 8 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Application Information
The following show some typical application examples for the ZXRE160.
Figure 3. 15V Supply Monitor
Figure 3 shows a typical configuration for the ZXRE160 in comparator
mode.
Here the comparator switches low when:
(
)
2
21FB
MRRRV
V+
≥
Alternative values of R1, R2 may be used to provide different threshold
voltages. R3 can also be adjusted to set the bias current for different
values of VM. R2 should be kept as low as possible to minimize errors
due to the bias current of the FB pin.
This circuit has no hysteresis, so a small capacitor of approx.4.7nF
between FB and GND is recommended to provide cleaner transitions at
the output.
In shunt regulator mode it is necessary to include the compensation capacitor C2 to guarantee stability. C2 may range in value from 0.1µF to
10µF depending on the application. The minimum value of C2 can be determined from the following equation (resistor values are in kΩ):
()
μF
RRR R
C2 213
2
MIN +
≥
Both C1 and C2 should be as close to the ZXRE160 as possible and connected to it with the shortest possible track. In the case of Figure 10 and
Figure 11, it means the opto-coupler will have to be carefully positioned to enable this.
REFOUT VV =
3R
OUTIN IVV
3R −
=
Figure 4. 0.6V Shunt Regulator
⎟
⎠
⎞
⎜
⎝
⎛+= 2R1R
1VV REFOUT
3R
OUTIN IVV
3R −
=
Figure 5. 1.0V Shunt Regulator
ZXRE160
Document number: DS35688 Rev. 2 - 2 9 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Application Information (cont.)
REFOUT VV =
Figure 6. 0.6V Series LDO Regulator
⎟
⎠
⎞
⎜
⎝
⎛+= 2R1R
1VV REFOUT
Figure 7. 1.0V Series LDO Regulator
Design guide:
1. Determine IOUT and choose a suitable transistor taking power dissipation into consideration.
2. Determine IB from )1h( I
I(min)FE
(max)OUT
B+
=
3. Determine IR3 from (min)KA
I
B
I
3R
I+≥ . The design of the ZXRE160 effectively means there is no IKA(min) limitation as in conventional
references. There is only an output leakage current which is a maximum of 1µA. Nevertheless, it is necessary to determine an IKA(min) to
ensure that the device operates within its linear range at all times. IKA(min) ≥ 10µA should be adequate for this.
4. Determine R3 from 3R
BEOUTIN I)VV(V
3R +−
=.
Although unlikely to be a problem, ensure that IR3 ≤ 15 mA.
ZXRE160
Document number: DS35688 Rev. 2 - 2 10 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Application Information (cont.)
⎟
⎠
⎞
⎜
⎝
⎛+= 2R1R
1VV REFOUT
BEOUT VV2.0V +≥
3R
OUTIN IVV
3R −
=
Figure 8. 1V Current-Boosted Shunt Regulator
Design guide
1. Determine IOUT and choose a suitable transistor taking power dissipation into consideration.
2. Determine IB from )1h( I
I(min)FE
(max)OUT
B+
=
3. Determine IR3 from (max)OUT3R II =
4. Determine R3 from 3R
OUTIN IVV
3R −
=
5. It is best to let the ZXRE160 supply as much current as it can before bringing Q1 into conduction. Not only does this minimize the strain on
Q1, it also guarantees the most stable operation. Choose a nominal value between 10mA and <15mA for this current, IR4.
Calculate R4 from 4R
BE
I
V
4R =
VOUT goes low and LED is lit when monitored supply
⎟
⎠
⎞
⎜
⎝
⎛+> 2R1R
1
REF
V
M
V
3R
I)2.0
F
V(
IN
V
3R +−
=
)MAX(F
I
3R
ImA15 ≤≥
VF and IF are forward voltage drop and current of LED1.
Figure 9. 1.15V Over-Voltage Indicator
ZXRE160
Document number: DS35688 Rev. 2 - 2 11 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Application Information (cont.)
REFOUT VV =
3R
FIN I)2.0V(V
3R +−
=
)MAX(F3R IImA15 ≤≥
Figure 10. Opto-Isolated 0.6V Shunt Regulator
⎟
⎠
⎞
⎜
⎝
⎛+= 2R1R
1VV REFOUT
3R
FIN I)2.0V(V
3R +−
=
)MAX(F3R IImA15 ≤≥
Figure 11. Opto-Isolated 1.0V Shunt Regulator
VF and IF are forward voltage drop and forward current respectively for the optocoupler LED
More applications information is available in the following publications which can be found on Diodes’ web site.
AN58 - Designing with Diodes’ References – Shunt Regulation
AN59 - Designing with Diodes’ References – Series Regulation
AN60 - Designing with Diodes’ References – Fixed Regulators and Opto-Isolation
AN61 - Designing with Diodes’ References – Extending the operating voltage range
AN62 - Designing with Diodes’ References – Other Applications
AN63 - Designing with Diodes’ References – ZXRE060 Low Voltage Regulator
ZXRE160
Document number: DS35688 Rev. 2 - 2 12 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Ordering Information
Tol. Part Number Package Identification
Code Reel Size Tape Width Quantity/Reel
0.5% ZXRE160AET5TA TSOT25 R8 7”, 180mm 8mm 3000
ZXRE160AH5TA SC70/SOT353 R9 7”, 180mm 8mm 3000
ZXRE160AFT4-7 DFN1520H4-6 R8 7”, 180mm 8mm 3000
1% ZXRE160ET5TA TSOT25 Z8 7”, 180mm 8mm 3000
ZXRE160H5TA SC70/SOT353 Z9 7”, 180mm 8mm 3000
ZXRE160FT4-7 X2-DFN1520-6 Z8 7”, 180mm 8mm 3000
Marking Information
1. TSOT25, SC70/SOT353
2. X2-DFN1520-6
ZXRE160
Document number: DS35688 Rev. 2 - 2 13 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Package Outline Dimensions (All dimensions in mm.)
TSOT25
SC70/SOT353
X2-DFN1520-6
TSOT25
Dim Min Max Typ
A − 1.00 −
A1 0.01 0.10 −
A2 0.84 0.90 −
D − − 2.90
E − − 2.80
E1 − − 1.60
b 0.30 0.45 −
c 0.12 0.20 −
e − − 0.95
e1 − − 1.90
L 0.30 0.50
L2 − − 0.25
θ 0° 8° 4°
θ1 4° 12° −
All Dimensions in mm
SOT353
Dim Min Max
A 0.10 0.30
B 1.15 1.35
C 2.00 2.20
D 0.65 Typ
F 0.40 0.45
H 1.80 2.20
J 0 0.10
K 0.90 1.00
L 0.25 0.40
M 0.10 0.22
α 0° 8°
All Dimensions in mm
X2-DFN1520-6
Dim Min Max Typ
A − 0.40 −
A1 0 0.05 −
A3 − − 0.13
b 0.20 0.30 −
D 1.45 1.575 −
D2 1.00 1.20 −
e − − 0.50
E 1.95 2.075 −
E2 0.70 0.90 −
L 0.25 0.35 −
All Dimensions in mm
c
A1
L
E1 E
A2
D
e1
e5x b
θ
4x 1
θ
L2
A
A
M
JL
D
B C
H
K
F
SEATING PLANE
AA3
A1
E2
b
De
L
E
D2
ZXRE160
Document number: DS35688 Rev. 2 - 2 14 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
Suggested Pad Layout
TSOT25
SC70/SOT353
X2-DFN1520-6
Dimensions Value (in mm)
C 0.950
X 0.700
Y 1.000
Y1 3.199
Dimensions Value (in mm)
Z 2.5
G 1.3
X 0.42
Y 0.6
C1 1.9
C2 0.65
Dimensions Value (in mm)
Z 1.25
G1 0.45
G2 0.15
X1 1.10
C 0.50
C1 0.25
G2
G2
C1 C
Z
G1
X
1
X
Z
Y
C1
C2C2
G
Y1
C C
X (5x)
Y (5x)
ZXRE160
Document number: DS35688 Rev. 2 - 2 15 of 15
www.diodes.com June 2012
© Diodes Incorporated
ZXRE160
NEW PRODUCT
A
Product Line o
f
Diodes Incorporated
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated p roducts for any unintended or una uthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign p atents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their pro ducts and an y
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2012, Diodes Incorporated
www.diodes.com
