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PDF NCP1411 Data sheet ( Hoja de datos )
| Número de pieza | NCP1411 | |
| Descripción | Sync-Rect PFM Step-Up DC-DC Converter | |
| Fabricantes | ON | |
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NCP1411
Sync−Rect PFM Step−Up
DC−DC Converter with
Low−Battery Detector and
Ring−Killer
NCP1411 is a monolithic micropower high frequency Boost
(step−up) voltage switching converter IC specially designed for
battery operated hand−held electronic products up to 250 mA loading.
It integrates Synchronous Rectifier for improving efficiency as well as
eliminating the external Schottky Diode. High switching frequency
(up to 600 kHz) allows low profile inductor and output capacitor being
used. Low−Battery Detector, Logic−Controlled Shutdown and
Cycle−by−Cycle Current Limit provide value−added features for
various battery−operated applications. The innovative Ring−Killer
circuitry guarantees quiet operation in discontinuous conduction
mode. With all these functions ON, the device quiescent supply
current is only 9.0 mA typical. This device is available in the space
saving compact Micro8t package.
Features
• Pb−Free Package is Available
• High Efficiency, up to 92%
• Very Low Device Quiescent Supply Current of 9.0 mA Typical
• Built−in Synchronous Rectifier (P−FET) Eliminates One External
Schottky Diode
• High Switching Frequency (up to 600 kHz) Allows use of Small Size
Inductor
• High Accuracy Reference Output, 1.19 V $ 0.6% @ 25°C, can
supply more than 2.5 mA when VOUT ≥ 3.3 V
• Ring−Killer for Quiet Operation in Discontinuous Conduction Mode
• 1.0 V Startup at No Load Guaranteed
• Output Voltage from 1.5 V to 5.5 V Adjustable
• Output Current up to 250 mA @ VIN = 2.5 V, VOUT = 3.3 V
• Logic−Controlled Shutdown
• Open Drain Low−Battery Detector Output
• 1.0 A Cycle by Cycle Current Limit
• Low Profile and Minimum External Parts
• Compact Micro8 Package
Typical Applications
• Personal Digital Assistant (PDA)
• Handheld Digital Audio Product
• Camcorder and Digital Still Camera
• Handheld Instrument
• Conversion from One or Two NiMH or NiCd, or One Li−ion Cell
to 3.3 V/5.0 V
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MARKING
DIAGRAM
8
1
Micro8
DM SUFFIX
CASE 846A
A2
AYW
A2 = Device Marking
A = Assembly Location
Y = Year
W = Work Week
PIN CONNECTIONS
FB 1
LBI/EN 2
LBO 3
REF 4
8 OUT
7 LX
6 GND
5 BAT
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCP1411DMR2
Micro8 4000 Tape & Reel
NCP1411DMR2G Micro8 4000 Tape & Reel
(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.
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 4
1
Publication Order Number:
NCP1411/D
1 page  
NCP1411
TYPICAL OPERATING CHARACTERISTICS
1.220
1.215
1.210
1.205
VOUT = 3.3 V
L = 22 mH
CIN = 10 mF
COUT = 33 mF
CREF = 1 mF
TA = 25°C
1.200
VIN = 1.8 V
VIN = 2.2 V
1.195
1.190
1
VIN = 3.0 V
10 100
ILOAD, OUTPUT CURRENT (mA)
1000
Figure 3. Reference Voltage versus Output
Current
1.195
1.192
1.189
1.186
1.183
1.180
1
IREF = 0 mA
CREF = 1 mF
TA = 25°C
IREF = 2.5 mA
23 45
VOUT, INPUT VOLTAGE AT OUT PIN (V)
Figure 4. Reference Voltage versus Input
Voltage at OUT Pin
6
1.194
1.5
1.192
1.190
1.188
1.186
1.184
−40
VOUT = 3.3 V
CREF = 150 nF
IREF = 0 mA
−20 0 20 40 60 80
TA, AMBIENT TEMPERATURE (°C)
Figure 5. Reference Voltage versus
Temperature
100
1.2
P−FET (M2)
0.9
0.6 N−FET (M1)
0.3
VOUT = 3.3 V
0
−40 −20 0 20 40 60 80
TA, AMBIENT TEMPERATURE (°C)
100
Figure 6. Switch ON Resistance versus
Temperature
1.8
1.7
1.6
1.5
1.4
1.3
1.2
−40
−20 0 20 40 60 80
TA, AMBIENT TEMPERATURE (°C)
100
Figure 7. LX Switch Max. ON Time versus
Temperature
1.9
WITHOUT SCHOTTKY DIODE
1.6
1.4
1.1 WITH SCHOTTKY DIODE
(MBR0502)
0.9
0.6
0
20 40 60 80 100
ILOAD, OUTPUT LOADING CURRENT (mA)
120
Figure 8. Min. Startup Battery Voltage versus
Loading Current
http://onsemi.com
5
5 Page 
NCP1411
along the path. Feedback signal path must be separated with
the main current path and sensing directly at the anode of the
output capacitor.
Components Placement
Power components, i.e. input capacitor, inductor and
output capacitor, must be placed as close together as
possible. All connecting traces must be short, direct and
thick. High current flowing and switching paths must be
kept away from the feedback (FB, pin 1) terminal to avoid
unwanted injection of noise into the feedback path.
Feedback Network
Feedback of the output voltage must be a separate trace
detached from the power path. External feedback network
must be placed very close to the feedback (FB, pin 1) pin and
sensing the output voltage directly at the anode of the output
capacitor.
VBATT
RLB1
225 k
CIN +
10 mF/10 V
GND
CEN
120 nF
RLB2
330 k
RFB1
335 k
CFB2
220 pF
RFB2
200 k
CFB1
150 pF
L 22 mH
1
2
3
4
CREF
150 nF
NCP1411
FB
LBI/EN
LBO
REF
OUT
LX
GND
BAT
8
7
6
5
VOUT
+
COUT
33 mF/10 V
GND
Figure 28. Typical Application Schematic for 2 Alkaline Cells Supply
http://onsemi.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NCP1411.PDF ] | |
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