NCP1582, NCP1582A,
NCP1583
Low Voltage Synchronous
Buck Controllers
The NCP158x is a low cost PWM controller designed to operate from
a 5 V or 12 V supply. This device is capable of producing an output
voltage as low as 0.8 V. This 8−pin device provides an optimal level of
integration to reduce size and cost of the power supply. Features include a
0.7 A gate driver and an internally set 350 kHz (NCP1582, NCP1582A)
and a 300 kHz (NCP1583) oscillator. The NCP158x also incorporates an
externally compensated transconductance error amplifier and a
programmable soft−start function. Protection features include short
circuit protection (SCP) and under voltage lockout (UVLO). The
NCP158x comes in an 8−pin SOIC package.
Features
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MARKING DIAGRAM
8
8
1
x
A
L
Y
W
G
SOIC−8
D SUFFIX
CASE 751
1
158x
ALYW
G
•
Input Voltage Range from 4.5 V to 13.2 V
•
350 kHz (NCP1582, NCP1582A), 300 kHz (NCP1583) Internal
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Oscillator
Boost Pin Operates to 30 V
Voltage Mode PWM Control
0.8 V
$1.5%
Internal Reference Voltage
Adjustable Output Voltage
Programmable Soft−Start
Internal 0.7 A Gate Drivers
80% Max Duty Cycle
Input UVLO
R
DS(on)
Current Sensing for Short Circuit Protection
These are Pb−Free Devices
Graphics Cards
Desktop Computers
Servers/Networking
DSP and FPGA Power Supply
DC−DC Regulator Modules
V
IN
V
CC
FB
COMP/DIS
BST
TG
PHASE
GND
BG
V
OUT
= 2, 2A or 3
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Device
PIN CONNECTIONS
BST 1
TG 2
GND 3
BG 4
(Top View)
NCP158x
Series
NCP1582
NCP1582A
NCP1583
Oscillator
Frequency
350 kHz
350 kHz
300 kHz
SCP Trip Voltage
−350
mV
−450
mV
−350
mV
8 PHASE
7 COMP/DIS
6 FB
5 V
CC
Applications
ORDERING INFORMATION
Device
NCP1582DR2G
NCP1582ADR2G
NCP1583DR2G
Package
SOIC−8
(Pb−Free)
SOIC−8
(Pb−Free)
SOIC−8
(Pb−Free)
Shipping
†
2500/Tape & Reel
2500/Tape & Reel
2500/Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Figure 1. Typical Application Diagram
©
Semiconductor Components Industries, LLC, 2008
October, 2008
−
Rev. 3
1
Publication Order Number:
NCP1582/D
NCP1582, NCP1582A, NCP1583
12 V
3.3 V
V
CC
FB
COMP/DIS
BST
TG
PHASE
V
OUT
GND
BG
Figure 2. Typical VGA Card Application Diagram
POR
UVLO
SCP Trip Voltage
FAULT
FB
6
-
+
0.8 V
(V
REF
)
LATCH
SCP
+
-
5
V
CC
+
-
FAULT
R
S
PWM
OUT
Q
1
2
8
BST
TG
PHASE
Clock
Ramp
COMP/DIS
7
OSC
OSC
+
-
+
-
2
V
2
V
FAULT
V
CC
4
3
BG
GND
Figure 3. Detailed Block Diagram
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2
NCP1582, NCP1582A, NCP1583
PIN FUNCTION DESCRIPTION
Pin No.
1
Symbol
BST
Description
Supply rail for the floating top gate driver. To form a boost circuit, use an external diode to bring the
desired input voltage to this pin (cathode connected to BST pin). Connect a capacitor (C
BST
) between this pin
and the PHASE pin. Typical values for C
BST
range from 0.1
mF
to 1
mF.
Ensure that C
BST
is placed near the IC.
Top gate MOSFET driver pin. Connect this pin to the gate of the top N−Channel MOSFET.
IC ground reference. All control circuits are referenced to this pin.
Bottom gate MOSFET driver pin. Connect this pin to the gate of the bottom N−Channel MOSFET.
Supply rail for the internal circuitry. Operating supply range is 4.5 V to 15 V. Decouple with a 1
mF
capacitor to GND. Ensure that this decoupling capacitor is placed near the IC.
This pin is the inverting input to the error amplifier. Use this pin in conjunction with the COMP pin to
compensate the voltage−control feedback loop. Connect this pin to the output resistor divider (if used) or dir-
ectly to Vout.
Compensation Pin. This is the output of the error amplifier (EA) and the non−inverting input of the PWM com-
parator. Use this pin in conjunction with the FB pin to compensate the voltage−control feedback loop. The com-
pensation capacitor also acts as a soft−start capacitor. Pull this pin low with an open drain transistor for disable.
Switch node pin. This is the reference for the floating top gate driver. Connect this pin to the source of the top
MOSFET.
2
3
4
5
6
TG
GND
BG
V
CC
FB
7
COMP/DIS
8
PHASE
ABSOLUTE MAXIMUM RATINGS
Pin Name
Main Supply Voltage Input
Bootstrap Supply Voltage Input
Switching Node (Bootstrap Supply Return)
High−Side Driver Output (Top Gate)
Low−Side Driver Output (Bottom Gate)
Feedback
COMP/DISABLE
Symbol
V
CC
BST
PHASE
TG
BG
FB
COMP/DIS
V
MAX
15 V
30 V wrt/GND
15 V wrt/PHASE
24 V
30 V wrt/GND
15 V wrt/PHASE
15 V
5.5 V
5.5 V
V
MIN
−0.3
V
−0.3
V
−0.7
V
−5
V for < 50 ns
−0.3
V
wrt/PHASE
−0.3
V
−2
V for < 200 ns
−0.3
V
−0.3
V
MAXIMUM RATINGS
Rating
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Operating Junction Temperature Range
Operating Ambient Temperature Range
Storage Temperature Range
Lead Temperature Soldering (10 sec): Reflow (SMD styles only)
(Note 1)
Moisture Sensitivity Level
Pb−Free
MSL
Symbol
R
qJA
R
qJC
T
J
T
A
T
stg
Value
165
45
−40
to 150
−40
to 85
−55
to +150
260 peak
1
Unit
°C/W
°C/W
°C
°C
°C
°C
−
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. 60−180 seconds minimum above 237°C.
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NCP1582, NCP1582A, NCP1583
ELECTRICAL CHARACTERISTICS
(0_C < T
A
< 70_C,
−40_C
< T
J
< 125_C (Note 2), 4.5 V < V
CC
< 13.2 V, 4.5 V < BST < 26.5 V,
C
TG
= C
BG
= 1.0 nF(REF:NTD30N02), for min/max values unless otherwise noted.)
Characteristic
Input Voltage Range
Boost Voltage Range
Supply Current
Quiescent Supply Current
Boost Quiescent Current
Under Voltage Lockout
UVLO Threshold
UVLO Hysteresis
Switching Regulator
VFB Feedback Voltage,
Control Loop in Regulation
Oscillator Frequency (NCP1582,
NCP1582A)
Oscillator Frequency (NCP1583)
Ramp−Amplitude Voltage
Minimum Duty Cycle
Maximum Duty Cycle
Minimum Pulse Width
Blanking Time
BG Minimum On Time
Error Amplifier (GM)
Transconductance
Open Loop DC Gain
Output Source Current
Output Sink Current
Input Offset Voltage
Input Bias Current
Unity Gain Bandwidth
Soft−Start
SS Source Current
Switch Over Threshold
Current Limit
Trip Voltage (NCP1582, NCP1583)
Trip Voltage (NCP1582A)
Gate Drivers
Upper Gate Source
Upper Gate Sink
Lower Gate Source
Lower Gate Sink
PHASE Falling to BG Rising Delay
BG Falling to TG Rising Delay
Enable Threshold
Vgs = 6.0 V
Vugate wrt Phase = 1.0 V
Vgs = 6.0 V
Vlgate wrt GND = 1.0 V
V
CC
= 12 V, PHASE < 2.0 V, BG > 2.0 V
V
CC
= 12 V, BG < 2.0 V, TG > 2.0 V
−
−
−
−
0.7
2.4
0.7
2.2
30
30
0.4
90
60
A
W
A
W
ns
ns
V
Vphase to ground
Vphase to ground
−350
−450
mV
mV
V
FB
< 0.8 V
5.0
10
100
15
mA
% of Vref
V
FB
= 0.8 V
V
FB
> 0.8 V
55
80
80
−2.0
70
120
120
0
0.1
4.0
2.0
1.0
5.0
−
mmho
DB
mA
mA
mV
mA
Mhz
Static Operating
T
A
= 0 to 70°C
−40
to 125°C
T
A
= 0 to 70°C
−40
to 125°C
T
A
= 0 to 70°C
−40
to 125°C
0.788
300
275
−
−
70
100
50
~500
0.8
0.8
350
350
300
300
1.1
0
75
0.812
400
325
−
−
80
150
V
kHz
kHz
V
%
%
ns
ns
ns
V
CC
Rising Edge
⎯
3.85
−
4.2
0.5
V
V
V
FB
= 1.0 V, No Switching
V
CC
= 13.2 V
V
FB
= 1.0 V, No Switching
−
−
1.0
140
1.75
−
mA
mA
Conditions
⎯
⎯
Min
4.5
4.5
Typ
Max
13.2
26.5
Unit
V
V
2. Specifications to
−40°C
are guaranteed via correlation using standard quality control (SQC), not tested in production.
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4
NCP1582, NCP1582A, NCP1583
TYPICAL OPERATING CHARACTERISTICS
380
I
CC
, SUPPLY CURRENT (mA)
F
SW
, FREQUENCY (kHz)
370
360
350
340
330
320
310
−50
−25
0
25
50
75
100
125
V
CC
= 12 V
V
CC
= 5.0 V
4.3
4.2
4.1
4.0
3.9
3.8
3.7
−50
−25
0
25
50
75
100
125
T
J
, JUNCTION TEMPERATURE (°C)
T
J
, JUNCTION TEMPERATURE (°C)
Figure 4. Oscillator Frequency (F
SW
) vs.
Temperature
812
V
ref
, REFERENCE VOLTAGE (mV)
UVLO RISING/FALLING (V)
808
804
800
796
792
788
784
−50
−25
0
25
50
75
100
125
4.4
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
−50
Figure 5. I
CC
vs. Temperature
RISING
FALLING
−25
0
25
50
75
100
125
T
J
, JUNCTION TEMPERATURE (°C)
T
J
, JUNCTION TEMPERATURE (°C)
Figure 6. Reference Voltage (V
ref
) vs. Temperature
Figure 7. UVLO vs. Temperature
SOFT START SOURCING CURRENT (mA)
12
500
11
I−LIMIT TRIP (mV)
450
400
10
350
9.0
−50
−25
0
25
50
75
100
125
300
−50
−25
0
25
50
75
100
125
T
J
, JUNCTION TEMPERATURE (°C)
T
J
, JUNCTION TEMPERATURE (°C)
Figure 8. Soft Start Sourcing Current vs.
Temperature
Figure 9. I−Limit vs. Temperature
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