NJW4170
Current Mode Control High Speed Frequency
Internal 1A MOSFET Switching Regulator IC for Buck Converter
GENERAL DESCRIPTION
The
NJW4170
is a high speed oscillating frequency buck
converter with
40V/1A
MOSFET. Current mode control and built-in
phase compensation circuit minimize external parts and contribute
to using a Low ESR Output Capacitor(MLCC) within wide input
range from 4.5V to 40V. Therefore, the
NJW4170
can realize
downsizing of applications.
Also, it has a soft start function, an external clock synchronization
function, an over current protection and a thermal shutdown circuit.
Over 2MHz of Switching frequency can avoid interference with
the AM radio frequency.
It is suitable for supplying power to a Car Accessory, Audio
Automation Equipment, Industrial Instrument and so on.
FEATURES
Oscillating Frequency
Minimum ON time
■
PACKAGE OUTLINE
NJW4170U2
NJW4170KV1
2.4MHz typ. (A ver.)
2.1MHz typ. (B ver.)
80ns typ.(A ver.)
85ns typ.(B ver.)
Current mode Control
External Clock Synchronization
Wide Operating Voltage Range
4.5V to 40V
Switching Current
1.4A min.
PWM Control
Built-in Compensation Circuit
Correspond to Ceramic Capacitor (MLCC)
Soft Start Function
4ms typ.
UVLO (Under Voltage Lockout)
Over Current Protection (Hiccup type)
Thermal Shutdown Protection
Standby Function
Package Outline
NJW4170U2 : SOT-89-5
NJW4170KV1 : DFN8-V1(ESON8-V1)
PRODUCT CLASSIFICATION
Part Number
NJW4170U2-A
NJW4170KV1-A
NJW4170U2-B
Version
A
A
B
Oscillating
Frequency
2.4MHz typ.
2.4MHz typ.
2.1MHz typ.
Package
SOT-89-5
DFN8-V1
(ESON8-V1)
SOT-89-5
Operating
Temperature Range
General Spec.
-40 C to +125 C
General Spec.
-40 C to +125 C
General Spec.
-40 C to +125 C
Ver.2016-01-25
-1-
NJW4170
PIN CONFIGURATION
EN/SYNC 1
GND 2
IN- 3
5 V
+
(2) GND
4 SW
SW
N.C.
V
+
N.C.
1
2
3
4
8
7
6
5
IN-
N.C.
GND
EN/SYNC
8
7
6
5
1
2
3
4
Exposed PAD on backside
connect to GND.
(Top View)
(Bottom View)
NJW4170U2
NJW4170KV1
PIN DESCRIPTIONS
PIN NAME
PIN NUMBER
DFN8-V1
SOT-89-5
(ESON8)
FUNCTION
Standby Control pin
The EN/SYNC pin internally pulls down with 100k . Normal
Operation at the time of High Level. Standby Mode at the time of
Low Level or OPEN.
Moreover, it operates by inputting clock signal at the oscillatory
frequency that synchronized with the input signal.
GND pin
Output Voltage Detecting pin
Connects output voltage through the resistor divider tap to this pin in
order to voltage of the IN- pin become 0.8V.
Switch Output pin of Power MOSFET
Power Supply pin for Power Line
Non connection
Connect to GND (Only DFN8-V1 PKG)
EN/SYNC
1
5
GND
IN-
SW
V
+
N.C.
Exposed
PAD
2
3
4
5
–
–
6
8
1
3
2, 4, 7
–
-2-
Ver.2016-01-25
NJW4170
BLOCK DIAGRAM
V
+
SLOPE
COMP.
UVLO
CURRENT
SENSE
OCP
Enable
(Standby)
100k
SYNC
OSC
S Q
R
TSD
Buffer
EN/SYNC
High: ON
Low : OFF(Standby)
SW
PWM
IN-
ER AMP
Soft Start
Vref
0.8V
GND
Ver.2016-01-25
-3-
NJW4170
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Supply Voltage
V
+
V
+
- SW pin Voltage
V
V-SW
EN/SYNC pin Voltage
V
EN/SYNC
IN- pin Voltage
V
IN-
Power Dissipation
Junction Temperature Range
Operating Temperature Range
Storage Temperature Range
P
D
Tj
T
opr
T
stg
MAXIMUM RATINGS
-0.3 to +45
+45
-0.3 to +45
-0.3 to +6
625 (*1)
SOT-89-5
2,400 (*2)
DFN8-V1
(ESON8-V1)
600 (*3)
1,800 (*4)
-40 to +150
-40 to +125
-50 to +150
(Ta=25°C)
UNIT
V
V
V
V
mW
C
C
C
2
(*1): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard size, 2Layers, Cu area 100mm )
(*2): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers)
(For 4Layers: Applying 74.2×74.2mm inner Cu area and a thermal via hall to a board based on JEDEC standard JESD51-5)
(*3): Mounted on glass epoxy board. (101.5 114.5 1.6mm: based on EIA/JEDEC standard, 2Layers FR-4, with Exposed Pad)
(*4): Mounted on glass epoxy board. (101.5 114.5 1.6mm: based on EIA/JEDEC standard, 4Layers FR-4, with Exposed Pad)
(For 4Layers: Applying 99.5 99.5mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5)
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
Supply Voltage
V
+
External Clock Input Range
A version
f
SYNC
B version
MIN.
4.5
2.3
2.0
TYP.
–
–
–
MAX.
40
2.8
2.5
UNIT
V
MHz
-4-
Ver.2016-01-25
NJW4170
ELECTRICAL CHARACTERISTICS
PARAMETER
Under Voltage Lockout Block
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
Soft Start Block
Soft Start Time
Oscillator Block
Oscillating Frequency
Oscillating Frequency
(Low Frequency Control)
(Unless otherwise noted, V
+
=V
EN/SYNC
=12V, Ta=25 C)
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
SYMBOL
V
T_ON
V
T_OFF
V
HYS
V
+
= L
→
H
V
+
= H
→
L
4.2
4.11
70
4.35
4.26
90
4.5
4.41
–
V
V
mV
t
SS
V
B
=0.75V
2.5
4
8
ms
f
OSC
f
OSC_LOW
f
DV
f
DT
A version, V
IN-
=0.7V
B version, V
IN-
=0.7V
A version, V
IN-
=0.2V
B version, V
IN-
=0.2V
V
+
=4.5 to 40V
Ta= -40 C to +85 C
2.2
1.9
–
–
–
–
2.4
2.1
340
290
1
5
2.6
2.3
–
–
–
–
MHz
MHz
kHz
kHz
%
%
Oscillating Frequency
deviation (Supply voltage)
Oscillating Frequency
deviation (Temperature)
Error Amplifier Block
Reference Voltage
Input Bias Current
PWM Comparate Block
Maximum Duty Cycle
Minimum ON Time1
(Use Built-in Oscillator)
Minimum ON Time2
(Use Ext CLK)
V
B
I
B
-1.0%
-0.1
0.8
–
+1.0%
+0.1
V
A
M
AX
D
UTY
t
ON-min1
t
ON-min2
A, B version, V
IN-
=0.7V
A version
B version
A version, f
SYNC
=2.6kHz
B version, f
SYNC
=2.3kHz
77.5
–
–
–
–
82
80
85
80
85
–
115
120
115
120
%
ns
ns
ns
ns
Ver.2016-01-25
-5-
嵌入式系统
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