WRN78XXT-500
Series
WIDE INPUT, NON-ISOLATED & REGULATED SMD PACKAGE SINGLE OUTPUT
PRODUCT PROGRAM
Input Voltage(VDC)
Part Number
Nominal
Range
Normal
Output Voltage (VDC)
Adjust
Range
Current
(mA)
Efficiency(%,Typ)
Efficiency
Vin
(min.)
Vin
(max.)
WRN7803T-500
12
12
24
24
24
4.5-28
6.0-28
11-28
14-28
17-28
3.3
5.0
9.0
12
15
1.8-5.5
2.5-8.0
3.0-11.5
4.5-13.5
4.5-15.5
500
500
500
500
500
90
94
95
95
96
75
81
87
90
92
FEATURES
◆
Efficiency up to 96%
◆
No need for heat sinks
◆
0.5AMP SMD package
◆
Wide input voltage range(4.5V~28V)
◆
Adjustable output voltage
◆
Remote ON/OFF control
◆
Short circuit protection,Thermal shutdown
◆
Very low shutdown current
◆
Super low ripple and noise
WRN7805T-500
WRN7809T-500
WRN7812T-500
WRN7815T-500
Note:
1. Answer for Vin-Vo>2V if needed to adjust the output voltage;
2. If input voltage above specified may cause permanent damage to the device.
3. WRN7812T-500, WRN7815T-500 is not allowed to operate under no load.
SPECIFICATIONS
Characteristics
Conditions
Min.
Typ.
Max.
Units
Input voltage range
Output voltage adjust range
See selection guide
See selection guide
Input voltage range at full load
Input voltage range at full load
Nominal Input ,10% to 100% load
20MHz bandwidth
Hiccup mode
Continuous, automatic recovery
4.5
1.8
12/24
28
15.5
V
V
%
%
%
mVp-p
MODEL SELECTION
WRN78 05 T -500
①
②
③
④
Output voltage accuracy
Line regulation
Load regulation
Ripple and Noise
Short circuit protection mode
Short circuit protection
Output current limit
Dynamic load stability
Quiescent current
Thermal shutdown
±2
±0.2
±0.3
10
±3
±0.5
±0.75
25
①Product
Series
②Output
Voltage
③SMD
Package Style
④Output
Current
1.8
100%<->10% load
Normal input (3.3V, 5V output)
Internal IC junction
-40℃ to +85℃ ambient
±30
15
160
±0.02
1000
ON: open or 1.5<Vc≤6V
OFF:GND or 0V<Vc<1V
2
15
1.1
-40
1.25
30
1.4
±85
±100
-55
1.5mm from case for 10 seconds
±125
300
95
Free Air Convection
Plastic (UL94-V0)
(MIL-HDBK-217F,+25℃)
2000
2.3
±75
A
mV
mA
℃
%/℃
µF
µA
µA
V
℃
℃
℃
℃
%
APPLICATIONS
The WRN78xxT-500 series with high efficiency
switching
regulators
are
ideally
supply
for
space
Temperature coefficient
Max capacitance load
ON/OFF control current
Shutdown input current
constrained mobile applications . They are no need for
any heat sinks , even if operate at +85
℃.
The additional
features include remote ON/OFF control and
adjustable
ON/OFF shutdown threshold voltage
Operating temperature range
Operating case temperature
Storage temperature range
Lead temperature
Storage humidity range
Cooling
Case material
MTBF
Package weight
output voltage.Super low ripple and noise of typically
only 10mV and a shutdown input current of typically only
15uA .
K hours
g
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Page 1 of 6
WRN78XXT-500
Series
TYPICAL TEMPERATURE CURVE
EXTERNAL CAPACITOR TABL
Part Number
WRN7803T-500
WRN7805T-500
WRN7809T-500
WRN7812T-500
WRN7815T-500
C1
(Ceramic capacitor)
10uF/50V
10uF/50V
10uF/50V
10uF/50V
10uF/50V
C2
(Ceramic capacitor)
22uF/16V
22uF/16V
22uF/16V
10uF/25V
10uF/25V
STANDARD APPLICATION CIRCUIT
1. C1,C2: Choose a ceramic type capacitors; C3 is require ,for best performance , use a 100uF or more capacitor please.
2. C1,C2 are require and should be placed close to the pins of the converter, with shortest possible traces.
3. No parallel connection or plug and play.
ADJUSTMENT RESISTOR VALUES
Model
Vo (nominal)
Adjusted range
Regulated voltage
1.8V
2.5V
3.0V
3.3V
3.6V
3.9V
4.5V
4.9V
5.0V
5.1V
5.5V
6.5V
7.2V
8.0V
9.0V
10.0V
11.0V
11.5V
12.0V
13.0V
13.5V
14.0V
14.5V
15.0V
15.5V
Note: The above dates only are as reference, you could make corresponding adjustment with actual output when they are at practical application.
88.2
40.6
15
18.84
4.47
1.61
129.1
59.1
24.3
15.25
14.05
12.8
8.65
208.5
58.5
15.57
7.8
3.15
WRN7803T-500
3.3V
1.8V-5.5V
R1(kΩ)
24.31
98.9
364
25.28
47.6
67.3
95.8
140.9
411
2060
3.1
5.79
8.47
11.8
19.14
25.77
27.3
29.22
37.8
70.8
115.3
243.1
4.55
8.05
9.16
10.41
15
29.8
43.5
64.8
105
180.6
370
635
2.69
5.55
6.17
6.98
10
18.5
26.2
36.7
52.9
76.3
111
134.1
167.7
277.8
385
586
1128
R2(kΩ)
R1(kΩ)
WRN7805T-500
5.0V
2.5V-8V
R2(kΩ)
WRN7809T-500
9V
3V-11.5V
R1(kΩ)
R2(kΩ)
WRN7812T-500
12V
4.5V-13.5V
R1(kΩ)
R2(kΩ)
WRN7815T-500
15V
4.5V-15.5V
R1(kΩ)
R2(kΩ)
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Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 2 of 6
WRN78XXT-500
Series
TEST CONFIGURATIONS (TA=25
℃
)
(TA=25℃
1
Efficiency and Output Voltage Ripple Test
2
Start-up and Load Transient Response Test
APPLICATION EXAMPLE
1. To reduce output ripple, it is recommended to add a LC filter to output port.
L: Recommended parameter 10µH ~ 47µH.
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Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 3 of 6
WRN78XXT-500
Series
SHUTDOWN CONTROL
The ON/OFF pin provides several features for adjusting and sequencing the power supply, a user has the flexibility of using the ON/OFF pin as:
1) A digital on/off control by pulling down the ON/OFF pin with an open-drain transistor.
2) Line UVLO. If desired to achieve a UVLO voltage, an resistor divider from Vin to ON/OFF to GND can be used to disable the converter until
a higher input voltage is achieved. For example , it is not useful for a converter with 12V output to start up with a 12V input voltage, as the output
cannot teach regulation. To enable the converter when the input voltage reaches 14V , a 51kΩ ⁄ 5kΩ resistor divider from Vin to GND can be
connected to the ON ⁄ OFF pin . Both the precision 1.25V threshold and 150mV hysteresis are multiplied by the resistor ratio , providing a
proportional 12% hysteresis for any startup threshold. So , the turn off threshold would be between 12.3V to 15.7V.
3) Power supply sequencing. By connecting a small capacitor from ON/OFF to GND, the 2µA current source and 1.25V threshold can provide a
stable and predictable delay between startup of multiple power supplies. For example, a startup delay of roughly 64mS is provided using 100nF, and
roughly 136mS by using 200nF.
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Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 4 of 6
WRN78XXT-500
Series
CHARACTERISTIC CURVE (TA=25
℃
)
(TA=25℃
Efficiency and Output Voltage Ripple
TAPING REEL DIMENSIONS
Note:
Unit :mm[inch]
General tolerances:
±0.50mm[±0.020inch]
Devices per reel quantity:500pcs
Inner packaging dimensions: L*W*H=365*350*150mm
Outer packaging dimensions: L*W*H=390*360*245mm
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Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 5 of 6
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