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NCP137BFCTADJT2G

P1-P3P4-P6P7-P8
NCP137
www.onsemi.com
4
ELECTRICAL CHARACTERISTICS −40°C ≤ T
J
≤ 85°C; V
BIAS
= 2.7 V or (V
OUT
+ 1.6 V), whichever is greater, V
IN
= V
OUT(NOM)
+
0.3 V, I
OUT
= 1 mA, V
EN
= 1 V, C
IN
= 4.7 mF, C
OUT
= 10 mF, C
BIAS
= 1 mF, unless otherwise noted. Typical values are at T
J
= +25°C.
Min/Max values are for −40°C ≤ T
J
≤ 85°C unless otherwise noted. (Notes 4, 5)
Parameter
Test Conditions Symbol Min Typ Max Unit
Operating Input Voltage
Range
V
IN
V
OUT
+
V
DO
5.5 V
Operating Bias Voltage
Range
V
BIAS
(V
OUT
+
1.50) ≥ 2.5
5.5 V
Undervoltage Lock−out V
BIAS
Rising
Hysteresis
UVLO 1.6
0.2
V
Reference Voltage
(Adj devices)
T
J
= +25°C V
REF
0.500 V
Output Voltage Accuracy V
OUT
±0.5 %
Output Voltage Accuracy −40°C ≤ T
J
≤ 85°C, V
OUT(NOM)
+ 0.3 V ≤ V
IN
≤
V
OUT(NOM)
+ 1.0 V, 2.7 V or (V
OUT(NOM)
+
1.6 V), whichever is greater < V
BIAS
< 5.5 V,
1 mA < I
OUT
< 700 mA
V
OUT
−1.0 +1.0 %
V
IN
Line Regulation V
OUT(NOM)
+ 0.3 V ≤ V
IN
≤ 5.0 V Line
Reg
0.01 %/V
V
BIAS
Line Regulation 2.7 V or (V
OUT(NOM)
+ 1.6 V), whichever is
greater < V
BIAS
< 5.5 V
Line
Reg
0.01 %/V
Load Regulation I
OUT
= 1 mA to 700 mA Load
Reg
1.5 mV
V
IN
Dropout Voltage I
OUT
= 700 mA (Notes 6, 7) V
DO
40 60 mV
V
BIAS
Dropout Voltage I
OUT
= 700 mA, V
IN
= V
BIAS
(Notes 6, 8, 9) V
DO
1.1 1.5 V
Output Current Limit V
OUT
= 90% V
OUT(NOM)
I
CL
800 1200 1500 mA
FB/SNS Pin Operating
Current
I
FB
, I
SNS
0.1 0.5
mA
Bias Pin Quiescent
Current
V
BIAS
= 2.7 V, I
OUT
= 0 mA I
BIASQ
35 50
mA
Bias Pin Disable Current V
EN
≤ 0.4 V I
BIAS(DIS)
0.5 1
mA
Vinput Pin Disable
Current
V
EN
≤ 0.4 V I
VIN(DIS)
0.5 1
mA
EN Pin Threshold Voltag
e
EN Input Voltage “H” V
EN(H)
0.9
V
EN Input Voltage “L” V
EN(L)
0.4
EN Pull Down Current V
EN
= 5.5 V I
EN
0.3 1
mA
Turn−On Time From assertion of V
EN
to V
OUT
=
98% V
OUT(NOM)
. V
OUT(NOM)
= 1.0 V,
C
OUT
= 4.7 mF
t
ON
150
ms
Power Supply Rejection
Ratio (Adj devices)
V
IN
to V
OUT
, f = 1 kHz, I
OUT
= 10 mA,
V
IN ≥ V
OUT
+0.5 V, V
OUT(NOM)
= 1.0 V,
C
OUT
= 4.7 mF
PSRR(V
IN
) 75 dB
V
BIAS
to V
OUT
, f = 1 kHz, I
OUT
= 10 mA,
V
IN ≥ V
OUT
+0.5 V, V
OUT(NOM)
= 1.0 V,
V
BIAS
= 3.0 V, C
OUT
= 4.7 mF
PSRR(V
BIAS
) 85 dB
Output Noise Voltage
(Adj devices)
V
IN
= V
OUT
+0.5 V, f = 10 Hz to 100 kHz,
V
OUT(NOM)
= 1.0 V, C
OUT
= 4.7 mF
V
N
35 x
V
OUT
/V
REF
mV
RMS
Thermal Shutdown
Threshold
Temperature increasing 160
°C
Temperature decreasing 140
4. Performance guaranteed over the indicated operating temperature range by design and/or characterization. Production tested at T
A
=
25°C. Low duty cycle pulse techniques are used during the testing to maintain the junction temperature as close to ambient as possible.
5. Adjustable devices tested at V
OUT
= V
REF
unless otherwise noted; external resistor tolerance is not taken into account.
6. Dropout voltage is characterized when V
OUT
falls 3% below V
OUT(NOM)
.
7. For adjustable devices, V
IN
dropout voltage tested at V
OUT(NOM)
= 2 x V
REF
.
8. For adjustable devices, V
BIAS
dropout voltage tested at V
OUT(NOM)
= 3 x V
REF
due to a minimum Bias operating voltage of 2.5 V.
9. For fixed output voltages below 1.5 V, V
BIAS
dropout does not apply due to a minimum Bias operating voltage of 2.5 V.
NCP137
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5
ELECTRICAL CHARACTERISTICS −40°C ≤ T
J
≤ 85°C; V
BIAS
= 2.7 V or (V
OUT
+ 1.6 V), whichever is greater, V
IN
= V
OUT(NOM)
+
0.3 V, I
OUT
= 1 mA, V
EN
= 1 V, C
IN
= 4.7 mF, C
OUT
= 10 mF, C
BIAS
= 1 mF, unless otherwise noted. Typical values are at T
J
= +25°C.
Min/Max values are for −40°C ≤ T
J
≤ 85°C unless otherwise noted. (Notes 4, 5)
Parameter UnitMaxTypMinSymbolTest Conditions
Output Discharge
Pull−Down
V
EN
≤ 0.4 V, V
OUT
= 0.5 V, NCP137A options
only
R
DISCH
150
W
Power Supply Rejection
Ratio (Fixed Voltage
devices)
V
IN
to V
OUT
, f = 1 kHz, I
OUT
= 10 mA,
V
IN
≥ V
OUT
+0.5 V, V
OUT(NOM)
= 1.05 V,
C
OUT
= 10 mF
PSRR(V
IN
) 75 dB
V
BIAS
to V
OUT
, f = 1 kHz, I
OUT
= 10 mA,
V
IN
≥ V
OUT
+0.5 V, V
OUT(NOM)
= 1.05 V,
V
BIAS
= 3.0 V, C
OUT
= 10 mF
PSRR(V
BIAS
) 85 dB
Output Noise Voltage
(Fixed Voltage devices)
V
IN
= V
OUT
+0.5 V, f = 10 Hz to 100 kHz,
V
OUT(NOM)
= 1.05 V, C
OUT
= 10 mF
V
N
40
mVRMS
4. Performance guaranteed over the indicated operating temperature range by design and/or characterization. Production tested at T
A
=
25°C. Low duty cycle pulse techniques are used during the testing to maintain the junction temperature as close to ambient as possible.
5. Adjustable devices tested at V
OUT
= V
REF
unless otherwise noted; external resistor tolerance is not taken into account.
6. Dropout voltage is characterized when V
OUT
falls 3% below V
OUT(NOM)
.
7. For adjustable devices, V
IN
dropout voltage tested at V
OUT(NOM)
= 2 x V
REF
.
8. For adjustable devices, V
BIAS
dropout voltage tested at V
OUT(NOM)
= 3 x V
REF
due to a minimum Bias operating voltage of 2.5 V.
9. For fixed output voltages below 1.5 V, V
BIAS
dropout does not apply due to a minimum Bias operating voltage of 2.5 V.
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
NCP137
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6
APPLICATIONS INFORMATION
IN
EN FB
LX
GND
Processor
I/O
BIAS
IN
OUT
GND
NCP137
LOAD
VBAT
1.5 V
1.0 V
To other circuits
I/O
EN
Figure 4. Typical Application: Low−Voltage DC/DC Post−Regulator with ON/OFF Functionality
Switch−mode DC/DC
V
OUT
= 1.5 V
SNS
The NCP137 dual−rail very low dropout voltage regulator
is using NMOS pass transistor for output voltage regulation
from V
IN
voltage. All the low current internal control
circuitry is powered from the V
BIAS
voltage.
The use of an NMOS pass transistor offers several
advantages in applications. Unlike PMOS topology devices,
the output capacitor has reduced impact on loop stability.
Vin to Vout operating voltage difference can be very low
compared with standard PMOS regulators in very low Vin
applications.
The NCP137 offers smooth monotonic start-up. The
controlled voltage rising limits the inrush current.
The Enable (EN) input is equipped with internal
hysteresis. NCP137 Voltage linear regulator Fixed and
Adjustable version is available.
Output Voltage Adjust
The required output voltage of Adjustable devices can be
adjusted from 0.5 V to 3.0 V using two external resistors.
Typical application schematics is shown in Figure 5.
BIAS
IN
OUT
GND
C
BIAS
4.7
mF
C
IN
NCP137  ADJ
V
BIAS
V
IN
EN
V
EN
V
OUT
FB
R1
R2
Figure 5. Typical Application Schematics
V
OUT
+ 0.5 V
ǒ
1 ) R1ńR2
Ǔ
It is recommended to keep the total serial resistance of
resistors (R1 + R2) no greater than 100 kW.
Dropout Voltage
Because of two power supply inputs V
IN
and V
BIAS
and
one V
OUT
regulator output, there are two Dropout voltages
specified.
The first, the V
IN
Dropout voltage is the voltage
difference (V
IN
– V
OUT
) when V
OUT
starts to decrease by
percent specified in the Electrical Characteristics table.
V
BIAS
is high enough; specific value is published in the
Electrical Characteristics table.
The second, V
BIAS
dropout voltage is the voltage
difference (V
BIAS
– V
OUT
) when V
IN
and V
BIAS
pins are
joined together and V
OUT
starts to decrease.
Input and Output Capacitors
The Adjustable device is designed to be stable for ceramic
output capacitors with Effective capacitance in the range
from 4.7 mF to 22 mF. The device is also stable with multiple
capacitors in parallel, having the total effective capacitance
in the specified range. For ADJ applications with nominal
output voltage less than 0.6 V and for all the fixed voltage
devices applications the output capacitor effective
capacitance 10 mF to 22 mF is recommended.
In applications where no low input supplies impedance
available (PCB inductance in V
IN
and/or V
BIAS
inputs as
example), the recommended C
IN
= 1 mF and C
BIAS
= 0.1 mF
or greater. Ceramic capacitors are recommended. For the best
performance all the capacitors should be connected to the
NCP137 respective pins directly in the device PCB copper
layer, not through vias having not negligible impedance.
When using small ceramic capacitor, their capacitance is
not constant but varies with applied DC biasing voltage,
temperature and tolerance. The effective capacitance can be
much lower than their nominal capacitance value, most
importantly in negative temperatures and higher LDO
output voltages. That is why the recommended Output
capacitor capacitance value is specified as Effective value in
the specific application conditions.
P1-P3P4-P6P7-P8

NCP137BFCTADJT2G

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Manufacturer:
ON Semiconductor
Description:
LDO Voltage Regulators 700 MA VERY LOW DROPOUT
Lifecycle:
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