Ultra light load high efficiency,VIN=17V,Current mode Step-down Io=3A Buck Regulator IC
NR131A
General Descriptions
The NR131A is buck regulator ICs integrates High-side
power MOSFETs. With the current mode control, ultra
low ESR capacitors such as ceramic capacitors can be
used. The ICs can realize super-high efficiency by
performing pulse skip operation at light load condition.
The ICs have protection functions such as Over-Current
Protection (OCP), Under-Voltage Lockout (UVLO) and
Thermal Shutdown (TSD). Soft starting time can be set
up by selecting an external capacitor value. The ON/OFF
pin (EN Pin) turns the regulator on or off and helps to
achieve low power consumption requirements. The
NR131A is available in an 8-pin eSOIC package with an
exposed thermal pad on the back side.
Jul/09/2015
Package
eSOIC8
NC
Features & Benefits
Current mode PWM control
Up to 94% efficiency at normal load condition
Up to 85% efficiency at light load condition
Stable with low ESR ceramic output capacitors
Built-in protection function
Over Current Protection (OCP)
Thermal Shutdown (TSD)
Under Voltage Lockout (UVLO)
Built-in phase compensation
Adjustable Soft-Start with an external capacitor
Turn ON/OFF the regulator function
Programable Pulse-Skip operation
Electrical Characteristics
3A Continuous output current
Operating input range V
IN
= 4.5V½17V
Output adjustable V
O
= 0.8V½14V
Fixed 350kHz frequency
Applications
LCD TV / Blue-ray / Set top box
Green electronic products
Other power supply
Typical Application Circuit
NR131A
C1, C2: 10μF / 25V, C4, C5: 22μF / 16V, C9: 0.1μF, C10: 0.1μF, R1: 510kΩ , R3: 10Ω, R4: 36 kΩ, R5: 27kΩ (VO=5.0V), R6: 12kΩ,
R7:510kΩ(Option), D1: SJPJ-L4, L1: 10μH
Rev.2.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
1
Ultra light load high efficiency,VIN=17V,Current mode Step-down Io=3A Buck Regulator IC
NR131A
Series Lineup
Product
Name
NR131A
(1)
(2)
Jul/09/2015
f
SW
V
IN
4.5V to
17V
V
O
0.8V to
14V
I
O
Package
350kHz
(1)
(2)
3A
eSOIC8
The minimum input voltage shall be either of 4.5V or VO+3V, whichever is higher.
The I/O condition limited by the Minimum on-time (TON(MIN)).
Absolute Maximum Ratings
Parameter
DC input voltage
BS terminal voltage
BS-SW Pin voltage
Symbol
V
IN
V
BS
V
BS-SW
Ratings
0.3½19
0.3½25
-0.3½6.0
0.3½7.5
2½19
4.5½19
0.3½5.5
0.3½19
0.3½7.4
5
1.76
40
~ 150
40
~ 150
26
71
Units
V
V
V
DC
Pulse width≦30ns
Conditions
SW terminal voltage
FB terminal voltage
EN terminal voltage
SS terminal voltage
SS terminal allowable input current
Power dissipation
Junction temperature
Storage temperature
Thermal resistance
(junction- Pin No. 4)
Thermal resistance
(junction-ambient air)
(3)
(4)
(3)
V
SW
V
FB
V
EN
V
SS
Issb
P
D1
T
J
T
S
θ
JP
θ
JA
V
V
V
V
mA
W
°C
°C
°C /W
°C /W
DC
Pulse width≦30ns
Glass-epoxy board mounting
in a 40×40mm.
(copper area in a 25×25mm)
Max T
J
=150°C
(4)
Glass-epoxy board mounting
in a 40×40mm.
(copper area in a 25×25mm)
Limited by thermal shutdown.
The temperature detection of thermal shutdown is about 165°C
Rev.2.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
2
Ultra light load high efficiency,VIN=17V,Current mode Step-down Io=3A Buck Regulator IC
NR131A
Recommended Operating Conditions
Parameter
DC input voltage
DC output current
Output voltage
(5)
(6)
(7)
Jul/09/2015
Symbol
V
IN
I
O
V
O
Ratings
MIN
V
o
+3
0
0.8
MAX
17
3.0
14
Units
V
A
V
Conditions
(7)
Ambient operating temperature
T
OP
85
°C
40
(5)
The minimum value of input voltage is taken as the larger one of either 4.5V or V
O
+3V.
In the case of V
IN
=V
O
+1½V
O
+3V , it is set to I
O
= Max. 2A
(6)
Recommended circuit refers to Typical Application Circuit.
(7)
To be used within the allowable package power dissipation characteristics.
Electrical Characteristics
Parameter
Reference voltage
Output voltage temperature
coefficient
Switching frequency
Line regulation
Load regulation
Over current protection
threshold
Supply Current(Non-switching)
Shutdown Supply Current
Input Under Voltage Lockout
threshold
SS Pin Charging current
EN Pin
Sink current
Threshold voltage
(8)
(8)
(8)
(8)
Ta = 25°C
Symbol
V
REF
⊿V
REF
/⊿T
f
SW
V
Line
V
Load
I
S
I
IN
I
IN(off)
Vuvlo
I
SS
I
EN
V
EN
D
MAX
T
ON(MIN)
TSD
TSD_hys
151
0.7
13
3.1
245
Ratings
MIN
0.780
TYP
0.800
±0.05
350
10
70
4.5
100
1
3.9
22
5
1.3
90
170
165
15
4.4
31
10
2.1
455
MAX
0.820
Units
V
Test conditions
(8)
V
IN
= 12V，I
o
= 1.0A
V = 12V, I
o
= 1.0A
mV/°C
IN
40°C
to +85°C
V
IN
=12V, V
o
=5.0V,
kHz
I
o
=1A
V
IN
= 8V½17V,
mV
V
o
= 5.0V, I
o
= 1A
V
IN
= 12V, V
o
= 5.0V,
mV
I
o
= 0.1A½2.0A
A
μA
μA
V
μA
μA
V
%
nsec
°C
°C
V
IN
= 12V, V
o
= 5.0V
V
IN
= 12V, V
EN
=12V
V
IN
=12V, V
EN
=0V
V
IN
Rising
V
SS
=0V, V
IN
=12V
V
EN
= 12V
V
IN
=12V
V
IN
=12V
V
IN
=12V
V
IN
=12V
V
IN
=12V
Max on-duty
Minimum on-time
Thermal shutdown threshold
temperature
Thermal shutdown restart
hysteresis of temperature
(8)
Guaranteed by design,not tested.
(8)
Rev.2.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
3
Ultra light load high efficiency,VIN=17V,Current mode Step-down Io=3A Buck Regulator IC
NR131A
Typical Performance Characteristics
NR131A typical Performance Characteristics
(1)Efficiency
Condition: V
O
=3.3V
Jul/09/2015
100
90
80
Ffficiency
η [%]
70
60
50
0.001
Vin=6V
Vin=12V
Vin=8V
Vin=14V
Vin=10V
Vin=16V
0.01
0.1
Output Current
I
O
[A]
1
10
Condition:V
O
=5.0V
100
90
Efficiency η [%]
80
70
60
50
0.001
Vin=6V
Vin=12V
Vin=8V
Vin=14V
Vin=10V
Vin=16V
0.01
0.1
Output Current I
O
[A]
1
10
Rev.2.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
4
Ultra light load high efficiency,VIN=17V,Current mode Step-down Io=3A Buck Regulator IC
NR131A
(2) Output startup Io=1A
6
5
Jul/09/2015
(5)Over Current Protection
6
5
4
3
2
1
0
Vin=8[V]
Vin=12[V]
Vin=16[V]
Output Voltage
V
O
[V]
4
3
2
1
0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
1
2
3
4
5
6
Input Voltage VIN [V]
Output Current I
O
[A]
(3) Load Regulation
:
V
Load
NR116KLoadReg.
Vo=3.3V L=10uH Ta=25℃
5.300
5.250
5.200
5.150
5.100
5.050
5.000
4.950
4.900
4.850
4.800
4.750
4.700
0.0
0.5
1.0
1.5
2.0
2.5
3.0
8
7
6
(6) Supply Current : I
IN
V
O
=5.0V
Supply Current : I
IN
Output Voltage
Vo [V]
V
O
[V]
Input Current
Iin [mA]
5
4
3
2
1
0
0
3
6
9
12
15
Input Voltage VIN [V]
18
Io [A]
Output Current I
O
[A]
(4) Shutdown Supply Current : I
IN(off)
0.40
0.35
0.30
0.25
0.20
0.15
(7) Switching Frequency: f
SW
NR110K focs
Vo=3.3V L=10uH
500
480
460
440
420
400
380
360
340
320
300
280
260
240
220
200
NR110K,111K,114K,115K,116K,117K
IQ_off
V
EN
=0V
Input Current
Iin [mA]
Iin [mA]
0.10
0.05
0.00
-0.05
-0.10
0.0
5.0
10.0
15.0
20.0
25.0
30.0
frequency
fosc [kHz]
f
OSC
[kHz]
0.0
1.0
2.0
3.0
4.0
5.0
Input Voltage
VIN[V]
V
IN
[V]
Io [A]
Output Current
I
O
[A]
Rev.2.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
5
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