ZXRE160

A Product Line of
Diodes Incorporated
ZXRE160
0.6V ENHANCED ADJUSTABLE PRECISION SHUNT REGULATOR
Description
Pin Assignments
ZXRE160_H5 (SC70/SOT353) and
The ZXRE160 is a 5-terminal adjustable shunt regulator offering
excellent temperature stability and output
ZXRE160_ET5 (TSOT25)
handling capability. This
Top view
device offers an enhancement to the ZXRE060 part for use in a
NEW PRODUCT
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
ZXRE160_FT4 (X2-DFN1520-6)
regulated output voltage can be set by selection of two external
Top view
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%
PGND
1
6
IN
N/C
2
5
GND
OUT
3
4
FB
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.
Exposed flag floating or
connect to GND
Features
•
Low reference voltage (VFB = 0.6V)
•
-40°C to +125°C temperature range
•
Reference voltage tolerance at +25°C
Applications
•
0.5% ZXRE160A
•
•
Isolated DC-DC converters
1%
ZXRE160
•
•
Core voltage POL
Typical temperature drift
•
•
Low Voltage Low-Dropout linear regulators
<4 mV (0°C to +70°C)
•
•
Shunt regulators
<6 mV (-40°C to +85°C)
•
•
Adjustable voltage reference
<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.
ZXRE160
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ZXRE160
NEW PRODUCT
Typical Applications Circuit
Pin Descriptions
Pin Name
Package Name
Pin Number
SC70/ SOT353,
X2-DFN1520-6
TSOT25
Function
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.
5
Analog Ground: Ground return for reference and amplifier: Connect GND and PGND
together.
GND
2
IN
3
6
—
—
Flag
ZXRE160
Document number: DS35688 Rev. 2 - 2
Supply Input: Connect a 0.1μF ceramic capacitor close to the device from IN to GND.
Floating or connect to GND
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ZXRE160
NEW PRODUCT
Functional Block Diagram
The ZXRE160 differs from most other shunt regulators in that it
auxiliary rail voltage, or below the minimum VIN voltage. This
has separate input and output pins and a low voltage reference.
allows it to operate as a low-dropout voltage regulator for
This enables it to regulate rails down to 600mV and makes the
microprocessor/DSP/PLD cores.
part ideal for isolated power supply applications that use
As with other shunt regulators (and shunt references), the
opto-couplers in the feedback loop and where the open-collector
ZXRE160 compares its internal amplifier FB pin to a high
output is required to operate down to voltages as low as 200mV.
accuracy internal reference; if FB is below the reference then OUT
The wide input voltage range of 2V to 18V and output voltage
turns off, but if FB is above the reference then OUT sinks current
range of 0.2V to 18V enables the ZXRE160 to be powered from
– up to a maximum of 15mA.
an auxiliary rail, while controlling a master rail which is above the
ZXRE160
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ZXRE160
Absolute Maximum Ratings (Voltages to GND, @TA = +25°C, unless otherwise specified.)
Symbol
VIN
NEW PRODUCT
VOUT
VFB
Parameter
Rating
Unit
IN Voltage relative to GND
20
V
OUT Voltage relative to GND
20
V
FB Voltage relative to GND
20
V
PGND
PGND Voltage relative to GND
IOUT
OUT Pin Current
-0.3 to +0.3
V
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
PDIS
Package
θJA
SC70/SOT353
400°C/W
310mW
TSOT25
250°C/W
500mW
X2-DFN1520-6
TBD
TBD
TA = 25°C, TJ = 150°C
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Min
Max
Units
VIN
IN Voltage Range (0 to +125°C)
2
18
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
Operating Ambient Temperature
Range
-40
+125
°C
TA
ZXRE160
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ZXRE160
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)
NEW PRODUCT
Symbol
Parameter
Conditions
TA = 0°C to +85°C
VFB
Feedback voltage
Min
Typ
Max
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
ZXRE160A
0.593
0.607
ZXRE160
0.590
0.610
Units
V
TA = -40°C to +85°C
TA = -40°C to +125°C
FBLOAD
Feedback pin load
regulation
FBLINE
Feedback pin line
regulation
FBOVR
Output voltage
regulation
3.8
IOUT = 1 to 15mA
TA = -40 to +125°C
VIN = 2V to 18V
0.3
VIN = 2.2V to 18V
TA = -40 to +125°C
VOUT = 0.2V to 18V,
IOUT = 1mA
6
10
1
1.5
mV
mV
1
TA = -40 to +125°C
(Ref. Figure 1)
1.5
mV
-45
IFB
FB input bias current
VIN = 18V
TA = -40 to +125°C
-200
0
VFB = 0.7V
-50
50
VIN = 2V to 18V
0.35
0.7
IOUT = 0.3mA
VIN = 2.2V to 18V
IIN
Input current
nA
mA
TA = -40 to +125°C
VIN = 2V to 18V
1
0.48
1
IOUT = 10mA
VIN = 2.2V to 18V
TA = -40 to +125°C
VIN = 18V, IOUT = 0.3mA
VFB = 0.7V
1.5
3
VIN = 18V,
IOUT(LK)
OUT leakage current
VOUT = 18V,
VFB =0V
mA
0.1
TA = +125°C
1
0.25
IOUT = 1 to 15mA
0.4
µA
ZOUT
Dynamic Output
Impedance
PSRR
Power supply rejection F = 300kHz
ratio
VAC = 0.3VPP
>45
dB
Amplifier Unity Gain
Frequency
600
kHz
5000
mA/V
BW
TA = -40 to +125°C
Ref: Figure 2
Amplifier
Transconductance
G
Note:
f < 1kHz
0.6
Ω
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
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ZXRE160
NEW PRODUCT
Typical Characteristics
ZXRE160
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ZXRE160
Typical Operating Characteristics
200
225
200
225
150
180
100
135
100
135
50
90
50
90
0
45
Gain (dB)
180
Phase (deg)
Gain (dB)
NEW PRODUCT
150
0
45
Gain
Gain
Phas e
Phase
-50
0
1
10
Phase (deg)
V OUT = 6V
COUT = 0.22uF
V OUT = 0.6V
COUT = 2.2uF
100
1k
10k
100k
1M
-50
0
1
10
100
1k
10k
100k
1M
Frequency (Hz)
Frequency (Hz)
Gain and Phase vs Frequency, VOUT=0.6V
Gain and Phase vs Frequency, V OUT=6V
Figure 2. Test Circuits for Gain and Phase Plots
ZXRE160
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ZXRE160
Application Information
The following show some typical application examples for the ZXRE160.
Figure 3 shows a typical configuration for the ZXRE160 in comparator
mode.
NEW PRODUCT
Here the comparator switches low when:
VM ≥
VFB (R1 + R 2 )
R2
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.
Figure 3. 15V Supply Monitor
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):
C2MIN ≥
R2
μF
R 3 (R1 + R 2 )
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.
R1 ⎞
⎛
VOUT = VREF ⎜1 +
⎟
⎝ R2 ⎠
VOUT = VREF
R3 =
VIN − VOUT
IR3
R3 =
Figure 4. 0.6V Shunt Regulator
ZXRE160
Document number: DS35688 Rev. 2 - 2
VIN − VOUT
IR3
Figure 5. 1.0V Shunt Regulator
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ZXRE160
NEW PRODUCT
Application Information (cont.)
R1 ⎞
⎛
VOUT = VREF ⎜1 +
⎟
⎝ R2 ⎠
VOUT = VREF
Figure 6. 0.6V Series LDO Regulator
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 IB =
3.
Determine IR3 from IR3 ≥ IB + IKA(min) . The design of the ZXRE160 effectively means there is no IKA(min) limitation as in conventional
IOUT(max)
(hFE(min) + 1)
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 R3 = VIN − ( VOUT + VBE ) .
IR3
Although unlikely to be a problem, ensure that IR3 ≤ 15 mA.
ZXRE160
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ZXRE160
Application Information (cont.)
NEW PRODUCT
R1 ⎞
⎛
VOUT = VREF ⎜1 +
⎟
⎝ R2 ⎠
VOUT ≥ 0.2V + VBE
R3 =
VIN − VOUT
IR3
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 I = IOUT(max)
B
3.
Determine IR3 from IR3 = IOUT(max)
4.
Determine R3 from R3 =
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.
(hFE(min) + 1)
Calculate R4 from R4 =
VIN − VOUT
IR3
VBE
IR4
VOUT goes low and LED is lit when monitored supply
R1 ⎞
⎛
VM > VREF ⎜ 1 +
⎟
⎝ R2 ⎠
V − ( VF + 0.2)
R3 = IN
IR3
15mA ≥ IR3 ≤ IF(MAX)
VF and IF are forward voltage drop and current of LED1.
Figure 9. 1.15V Over-Voltage Indicator
ZXRE160
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ZXRE160
NEW PRODUCT
Application Information (cont.)
R1 ⎞
⎛
VOUT = VREF ⎜1 +
⎟
R2 ⎠
⎝
VOUT = VREF
R3 =
VIN − ( VF + 0.2)
IR3
R3 =
15mA ≥ IR3 ≤ IF(MAX)
VIN − ( VF + 0.2)
IR3
15mA ≥ IR3 ≤ IF(MAX)
Figure 11. Opto-Isolated 1.0V Shunt Regulator
Figure 10. Opto-Isolated 0.6V 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
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NEW PRODUCT
Ordering Information
Tol.
0.5%
1%
Part Number
Package
Identification
Code
Reel Size
Tape Width
Quantity/Reel
ZXRE160AET5TA
TSOT25
R8
7”, 180mm
8mm
3000
ZXRE160AH5TA
SC70/SOT353
R9
7”, 180mm
8mm
3000
ZXRE160AFT4-7
DFN1520H4-6
R8
7”, 180mm
8mm
3000
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
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Package Outline Dimensions (All dimensions in mm.)
TSOT25
D
NEW PRODUCT
e1
E
E1
L2
c
4x θ1
e
L
θ
5x b
A
A2
A1
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
SC70/SOT353
A
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
0°
8°
α
All Dimensions in mm
B C
H
K
J
M
D
L
F
X2-DFN1520-6
A3
A
SEATING PLANE
A1
D
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
e
L
E2
E
D2
b
ZXRE160
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Suggested Pad Layout
TSOT25
NEW PRODUCT
C
C
Dimensions Value (in mm)
C
0.950
X
0.700
Y
1.000
Y1
3.199
Y1
Y (5x)
X (5x)
SC70/SOT353
C2
Z
C2
C1
G
Y
Dimensions Value (in mm)
Z
2.5
G
1.3
X
0.42
Y
0.6
C1
1.9
C2
0.65
X
X2-DFN1520-6
C1
C
G2
G1
X1
Dimensions
Z
G1
G2
X1
C
C1
Value (in mm)
1.25
0.45
0.15
1.10
0.50
0.25
G2
Z
ZXRE160
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IMPORTANT NOTICE
NEW PRODUCT
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 products for any unintended or unauthorized 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 patents 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 products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
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representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
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