NCP1587DR2G ON Semiconductor, NCP1587DR2G Datasheet

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NCP1587DR2G

Manufacturer Part Number
NCP1587DR2G
Description
IC CTLR SYNC BUCK LV 8-SOIC
Manufacturer
ON Semiconductor
Type
Step-Down (Buck)r
Datasheet

Specifications of NCP1587DR2G

Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
Adjustable
Current - Output
1A
Frequency - Switching
275kHz
Voltage - Input
4.5 ~ 13.2 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Topology
Boost, Buck
Output Voltage
0.8 V to 5 V
Output Current
8 mA
Switching Frequency
300 KHz
Duty Cycle (max)
80 %
Operating Supply Voltage
15 V
Supply Current
8 mA
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Synchronous Pin
No
Number Of Pwm Outputs
2
On/off Pin
Yes
Adjustable Output
Yes
Switching Freq
300KHz
Duty Cycle
80%
Operating Supply Voltage (max)
13.2V
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC N
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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NCP1587, NCP1587A
Low Voltage Synchronous
Buck Controller
designed to operate from a 5 V or 12 V supply. These devices are
capable of producing an output voltage as low as 0.8 V. These 8−pin
devices provide an optimal level of integration to reduce size and cost
of the power supply. The NCP1587/A provide a 1 A gate driver design
and an internally set 275 kHz (NCP1587) and 200 kHz (NCP1587A)
oscillator. In addition to the 1 A gate drive capability, other efficiency
enhancing features of the gate driver include adaptive non−overlap
circuitry. The devices also incorporate an externally compensated
error amplifier and a capacitor programmable soft−start function.
Protection features include programmable short circuit protection and
under voltage lockout (UVLO). The NCP1587/A comes in an 8−pin
SOIC package.
Features
Applications
© Semiconductor Components Industries, LLC, 2011
February, 2011 − Rev. 4
The NCP1587 and NCP1587A are low cost PWM controllers
Compliant
Input Voltage Range from 4.5 to 13.2 V
275 kHz (NCP1587) and 200 kHz (NCP1587A) Internal Oscillator
Boost Pin Operates to 30 V
Voltage Mode PWM Control
0.8 V ±1.0 % Internal Reference Voltage
Adjustable Output Voltage
Capacitor Programmable Soft−Start
Internal 1 A Gate Drivers
80% Max Duty Cycle
Input Under Voltage Lockout
Programmable Current Limit
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Graphics Cards
Desktop Computers
Servers / Networking
DSP & FPGA Power Supply
DC−DC Regulator Modules
1
†For information on tape and reel specifications,
NCP1587DR2G
NCP1587ADR2G
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
8
Device
1
ORDERING INFORMATION
GND
BST
BG
TG
1587x = Specific Device Code
A
L
Y
W
G
PIN CONNECTIONS
http://onsemi.com
CASE 751
D SUFFIX
1
2
3
4
SOIC−8
(x = A for NCP1587A,
blank for NCP1587)
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Device
(Top View)
(Pb−Free)
(Pb−Free)
Package
SOIC−8
SOIC−8
Publication Order Number:
MARKING DIAGRAM
8
1
8 PHASE
7 COMP/DIS
6 FB
5 V
2500/Tape & Reel
2500/Tape & Reel
ALYW
1587x
Shipping
CC
G
NCP1587/D

Related parts for NCP1587DR2G

NCP1587DR2G Summary of contents

Page 1

... PIN CONNECTIONS BST GND (Top View) ORDERING INFORMATION Device Package NCP1587DR2G SOIC−8 (Pb−Free) NCP1587ADR2G SOIC−8 (Pb−Free) †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. 1 MARKING DIAGRAM 8 ...

Page 2

0 REF COMP/DIS 3 BST FB COMP/DIS TG PHASE BG GND Figure 1. Typical Application Diagram POR UVLO FAULT LATCH FAULT + R PWM - Q ...

Page 3

PIN FUNCTION DESCRIPTION Pin No. Symbol 1 BST 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 ...

Page 4

ELECTRICAL CHARACTERISTICS 0 V < PHASE < 1.0 nF, for min/max values unless otherwise noted Characteristic Input Voltage Range Boost Voltage Range Supply Current Quiescent Supply Current V Boost Quiescent Current V ...

Page 5

TYPICAL CHARACTERISTICS 5.0 4.7 4.4 4.1 3.8 3 JUNCTION TEMPERATURE (°C) J Figure 3. I vs. Temperature JUNCTION ...

Page 6

General The NCP1587 and NCP1587A are PWM controllers intended for DC−DC conversion from 5.0 V & buses. The devices have internal gate driver circuit designed to drive N−channel MOSFETs in a synchronous−rectifier buck topology. The ...

Page 7

UVLO Undervoltage Lockout (UVLO) is provided to ensure that unexpected behavior does not occur when V support the internal rails and power the converter. For the NCP1587/A, the UVLO is set to permit operation when converting from a 5.0 input ...

Page 8

Input Capacitor Selection The input capacitor has to sustain the ripple current produced during the on time of the upper MOSFET must have a low ESR to minimize the losses. The RMS value of this ripple is: Iin ...

Page 9

In contrast, smaller values of inductance increase the regulator’s maximum achievable slew rate and decrease the necessary capacitance, at the expense of higher ripple current. The peak-to-peak ripple current for NCP1587 is given by the following ...

Page 10

P = control IC power dissipation measured supply current supply voltage top gate driver losses bottom gate driver losses. BG The upper (switching) MOSFET gate driver ...

Page 11

Figure 13. Closed-loop Voltage Loop-gain of the NCP1587 DESIGN EXAMPLE II: Type III Compensation (Oscon Cap. with small ESR; Do not place R Switching Frequency F Output Capacitance R Output Capacitance C Output Inductance L Input Voltage V Output Voltage ...

Page 12

After choose R4 value, adjust R4 to get enough phase margin Ù 665 W 2nd pole; Choose C to eliminate the noise 275 KHz ...

Page 13

VCC GND 5 3 Figure 15. Demo Board PCB Layout http://onsemi.com 13 ...

Page 14

... TP U1 NCP1587 http://onsemi.com 14 Quantity MFG 1 PANASONIC TAIYO YUDEN 1 AVX 2 PANASONIC PANASONIC TDK 1 ON SEMICONDUCTOR 1 PANASONIC 1 MOLEX 1 PASTERNACK ENTERPRISES 1 PANASONIC SEMICONDUCTOR 2 ON SEMICONDUCTOR 2 ON SEMICONDUCTOR 2 ON SEMICONDUCTOR SEMICONDUCTOR 1 PANASONIC 2 DALE DALE 3 PANASONIC DALE 24 DALE 24 PANASONIC 1 DALE 1 DALE 16 KEYSTONE 1 ON SEMICONDUCTOR ...

Page 15

Figure 16. Gate Waveforms 20 A Load Sustaining Figure 18. Start-up Sequence Figure 17. Over Current Protection (12 Trip) Figure ...

Page 16

... *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. ON Semiconductor and are registered 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. “ ...

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