Figure 1. Circuit Schematic for 0.9 Volt 1.7 Ampere LDO
RESULTS
Utilizing the circuit in Figure 1, layout in Figure 3 and
values in Table 1, the output voltage varies 40 millivolts
between 1.5 volts to 3.0 volts and 0 amperes to 1.7 amperes
for an output voltage centered at 0.945 volts, which equates
to a +/– 2.5 % variation for load and line. The voltage droop
due to load transient is small as seen in Figure 2. If R1 is
varied to change the output voltage to 1.8 volts, the
minimum drop out voltage is 34 millivolts under light load
conditions and 230 millivolts for 1.7 amperes. The
minimum input voltage to operate of the circuit in Figure 1
is 1.42 volts for 1.7 amperes and 1.37 volts for 0.5 amperes.
As discussed previously, the operating range of this circuit
can vary depending upon R3.
V
out
: 200 mV/div
I
out
: 0.5 A/div
Time Scale: 100 us/div
Figure 2. Load Transient for 1.8 Volts In and Load
from 0.5 Amperes to 1.5 Amperes
http://onsemi.com
2
AND8028/D
Out
GND
In
C2
+
C1
+
C3 U1
R2
R1
Q1
R6
R3
C4
D1
R4
Q2
R5
Figure 3. Layout of NCP100/MBT35200 LDO (4x)
Table 1. Part Description for LDO Circuit
Reference
C1
C2
C3
C4
D1
JP1
Q1
Q2
R1
R2
R3
R4
R5
R6
U1
Part
100 u
100 u
1u
1n
MRA4003T3
Connector
MBT35200
MBT3904
1.5 k
4.3 k
18
10
300
1k
NCP100
Description
AVX Tantalum SMT
AVX Tantalum SMT
0805 Ceramic Chip Cap
0805 Ceramic Chip Cap
ON Semiconductor SMA Diode
3 Pin Connector
ON Semiconductor TSOP–6 PNP
ON Semiconductor SOT–23 NPN
1206 Chip Resistor
0805 Chip Resistor
0805 Chip Resistor
0805 Chip Resistor
0805 Chip Resistor
0805 Chip Resistor
ON Semiconductor Precision Reference
http://onsemi.com
3
AND8028/D
ON Semiconductor
and
are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
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