NCP1521BSNT1G ON Semiconductor, NCP1521BSNT1G Datasheet

IC CONV DC-DC STEPDOWN SOT23-5

NCP1521BSNT1G

Manufacturer Part Number
NCP1521BSNT1G
Description
IC CONV DC-DC STEPDOWN SOT23-5
Manufacturer
ON Semiconductor
Type
Step-Down (Buck)r
Datasheet

Specifications of NCP1521BSNT1G

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.9 ~ 3.9 V
Current - Output
600mA
Frequency - Switching
1.5MHz
Voltage - Input
2.7 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
TSOT-23-5, TSOT-5, TSOP-5
Mounting Style
SMD/SMT
Duty Cycle (max)
100 %
Efficiency
90 %
Input / Supply Voltage (max)
3.9 V
Output Current
600 mA
Output Voltage
3.3 V
Switching Frequency
1.5 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
NCP1521BSNT1GOSTR

Available stocks

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ON
Quantity:
3 000
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NCP1521BSNT1G
Manufacturer:
ON Semiconductor
Quantity:
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Part Number:
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ON
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3 000
Part Number:
NCP1521BSNT1G
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ON
Quantity:
12 000
NCP1521B
1.5 MHz, 600 mA Step-Down
DC-DC Converter
High−Efficiency, Low Ripple, Adjustable
Output Voltage
integrated circuit optimized for portable applications powered from one
cell Li−Ion or three cell Alkaline/NiCd/NiMH batteries. The part,
available in adjustable output voltage versions ranging from 0.9 V to
3.9 V, is able to deliver up to 600 mA. It uses synchronous rectification
to increase efficiency and reduce external part count. The device also
has a built−in 1.5 MHz (nominal) oscillator which reduces component
size by allowing smaller inductors and capacitors. Automatic switching
PWM/PFM mode offers improved system efficiency.
current limiting and thermal shutdown protection. The NCP1521B is
available in a space saving, low profile TSOP5 and UDFN6 packages.
Features
Typical Applications
OFF ON
© Semiconductor Components Industries, LLC, 2010
December, 2010 − Rev. 5
The NCP1521B step−down DC−DC converter is a monolithic
Additional features include integrated soft−start, cycle−by−cycle
Up to 96% Efficiency
Best−In−Class Ripple, including PFM Mode
Sources up to 600 mA
1.5 MHz Switching Frequency
Adjustable Output Voltage from 0.9 V to 3.9 V
Synchronous Rectification for Higher Efficiency
2.7 V to 5.5 V Input Voltage Range
Low Quiescent Current
Shutdown Current Consumption of 0.3 mA
Thermal Limit Protection
Short Circuit Protection
All Pins are Fully ESD Protected
This is a Pb−Free Device
Cellular Phones, Smart Phones and PDAs
Digital Still/Video Cameras
MP3 Players and Portable Audio Systems
Wireless and DSL Modems
Portable Equipment
USB Powered Devices
Figure 1. Typical Application − TSOP−5
VIN
CIN
1
2
3
VIN
GND
EN
FB
LX
5
4
COUT
L
R1
R2
VOUT
Cff
1
OFF ON
VIN
Figure 2. Typical Application − UDFN6
†For information on tape and reel specifications,
NCP1521BSNT1G
NCP1521BMUTBG
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
5
1
2
3
Device
1
EN
GND
VIN
GAL
A
Y
W
G
(Note: Microdot may be in either location)
ZC
M
G
(Note: Microdot may be in either location)
ORDERING INFORMATION
GND 4
http://onsemi.com
FB 6
LX
= Specific Device Code
= Assembly Location
= Year
= Work Week
= Pb−Free Package
CASE 517AB
= Specific Device Code
= Date Code
= Pb−Free Package
MU SUFFIX
SN SUFFIX
CASE 483
TSOP−5
5
UDFN6
(Pb−Free)
(Pb−Free)
Package
TSOP−5
UDFN6
Publication Order Number:
R2
R1
3000/T ape & Reel
3000/T ape & Reel
5
1
Shipping
MARKING
DIAGRAM
NCP1521B/D
1
2
3
GALAYWG
ZCMG
G
G
VOUT
6
5
4

NCP1521BSNT1G Summary of contents

Page 1

... FB 4 Figure 1. Typical Application − TSOP−5 © Semiconductor Components Industries, LLC, 2010 December, 2010 − Rev NCP1521BSNT1G NCP1521BMUTBG †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. ...

Page 2

Figure 3. Efficiency vs. Output Current V battery VIN PWM/PFM 1 CONTROL 4.7 mF GND 2 LOGIC CONTROL Enable EN & THERMAL 3 SHUTDOWN Figure 4. Simplified ...

Page 3

PIN FUNCTION DESCRIPTION Pin No. Pin No. TSOP5 UDFN6 Pin Name 1 3 VIN GND VIN GND (Top View) Figure 5. Pin ...

Page 4

ELECTRICAL CHARACTERISTICS ambient temperature, unless otherwise noted, operating conditions V Rating VIN PIN Input Voltage Range Quiescent Current, PFM No Switching Standby Current, EN Low Undervoltage Lockout (V Falling PIN Positive going Input High Voltage Threshold, EN0 Signal ...

Page 5

TABLE OF GRAPHS Typical Characteristics for Step−down Converter I Standby Current STB I Quiescent Current, PFM No Switching q V Output Voltage Accuracy OUT Eff Efficiency Freq Switching Frequency V Soft−Start OUT V Short Circuit Protection OUT V Line Regulation ...

Page 6

I OUT −0.5% −1.0% −40 0 TEMPERATURE (°C) Figure 9. Output Voltage Accuracy vs. Temperature ( OUT 100% 95% V 90% OUT 85% V OUT 80% 75% 70% 65% ...

Page 7

V OUTIN 2 V/div Figure 15. Typical Soft−Start ( OUT OUT 1.25 1.24 1.23 1.22 25°C 85°C 1.21 1.20 1.19 1.18 1.17 1.16 1.15 2.7 3.2 3.7 4 INPUT ...

Page 8

I , (mA) OUT Figure 21. Load Regulation ( OUT V OUT 50 mV/div I OUT 50 mA/div Figure 23. ...

Page 9

Overview The NCP1521B uses a constant frequency, current mode step−down architecture. Both the main (P−Channel MOSFET) and synchronous (N−Channel MOSFET) switches are internal. It delivers a constant voltage from either a single Li−Ion or three cell NiMH/NiCd battery to portable ...

Page 10

Cycle−by−Cycle Current Limitation From the block diagram (Figure 4 used to realize cycle−by−cycle current limit protection. The comparator compares the LX pin voltage with the reference voltage, which is biased by a constant current. If the inductor ...

Page 11

Output Voltage Selection The output voltage is programmed through an external resistor divider connected from V OUT For low power consumption and noise immunity, the resistor from FB to GND (R2) should be in the [100 k−600 k] range. If ...

Page 12

Table 3. LIST OF INDUCTOR FDK MIPW3226 Series TDK VLF3010AT Series Taiyo Yuden LQ CBL2012 Coil craft DO1605−T Series Output Capacitor Selection Selecting the proper output capacitor is based on the desired output ripple voltage. Ceramic capacitors with low ESR ...

Page 13

... A C SEATING 0.05 PLANE H T *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. PACKAGE DIMENSIONS TSOP−5 CASE 483−02 ISSUE H NOTES: 1. DIMENSIONING AND TOLERANCING PER 2. CONTROLLING DIMENSION: MILLIMETERS. ...

Page 14

... Pb−Free strategy and soldering 0. details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. 0. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81− ...

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