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PDF NCP1417 Data sheet ( Hoja de datos )
| Número de pieza | NCP1417 | |
| Descripción | 200 mA DC-DC Step-up Converter | |
| Fabricantes | ON | |
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NCP1417
200 mA DC−DC Step−up
Converter with Dual Low
Battery Protection
NCP1417 is a monolithic micropower high frequency Boost
(step−up) voltage switching converter IC specially designed for
battery operated hand−held electronic products up to 200 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 use of a low profile inductor and output
capacitor. Dual Low−Battery Detectors and Cycle−by−Cycle Current
Limit provide value−added features for various battery−operated
applications. With all these functions ON, the quiescent supply current
is only 9.0 mA typical. This device is available in a space saving
compact Micro8t package.
Features
• High Efficiency, Up to 92%, Typical
• 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 Small Size
Inductor and Capacitor
• High Accuracy Reference Output, 1.19 V ± 0.6% @ 25_C, Can
Supply More Than 2.5 mA when VOUT ≥ 3.3 V
• 1.0 V Startup at No Load Guaranteed
• Output Voltage from 1.5 V to 5.5 V Adjustable
• Output Current Up to 200 mA @ Vin = 2.5 V, Vout = 3.3 V
• Multi−Function LBI/Shutdown Control Pin
• Dual Open Drain Low−Battery Detector Outputs
• 1.0 A Cycle by Cycle Current Limit
• Low Profile and Minimum External Parts
• Compact Micro8 Package
Applications
• Personal Digital Assistants (PDA)
• Handheld Digital Audio Product
• Camcorders and Digital Still Camera
• Handheld Instrument
• Conversion from One or Two NiMH or NiCd or One Lithium−ion
Cells to 3.3 V/5.0 V
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8
1
Micro8
DM SUFFIX
CASE 846A
MARKING
DIAGRAM
8
1417
AYW
1
1417 = Device Marking
A = Assembly Location
Y = Year
W = Work Week
PIN CONNECTIONS
FB
LBI/SHDN
LBO1
REF
1
2
3
4
(Top View)
8 OUT
7 LX
6 GND
5 LBO2
ORDERING INFORMATION
Device
Package
Shipping
NCP1417DMR2
Micro8 4000 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 3
1
Publication Order Number:
NCP1417/D
1 page  
NCP1417
1.220
1.215
1.210
1.205
VOUT = 3.3 V
L = 22 μH
Cin = 10 μF
Cout = 33 μF
CREF = 1 μF
TA = 25_C
1.200
1.195
VIN = 1.8 V
VIN = 2.2 V
VIN = 3 V
1.195
1.192
1.189
1.186
1.183
CREF = 1 μF
TA = 25_C
IREF = 0 mA
IREF = 2.5 mA
1.190 1
10 100
OUTPUT CURRENT, ILOAD/mA
Figure 3. Reference Voltage versus
Output Current
1000
1.180
1
1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE at OUT PIN, VOUT/V
Figure 4. Reference Voltage versus
Input Voltage at OUT Pin
5.5
1.194
2
1.192
1.5 P−FET (M2)
1.19
1.188
1 N−FET (M1)
1.186
VOUT = 3.3 V
CREF = 150 nF
IREF = 0 mA
0.5
VOUT = 3.3 V
1.184−40 −20 0 20 40 60 80 100
0−40 −20
0
20 40 60 80 100
AMBIENT TEMPERATURE, TA/_C
AMBIENT TEMPERATURE, TA/_C
Figure 5. Reference Voltage versus
Temperature
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
AMBIENT TEMPERATURE, TA/_C
Figure 7. Lx Switch Max. ON Time
versus Temperature
100
2.1
1.8
Without Schottky Diode
1.5
1.2
With Schottky Diode
0.9 (MBR0502)
0.6 0
20 40 60 80 100
OUTPUT LOADING CURRENT, ILOAD/mA
Figure 8. Min. Startup Battery Voltage
versus Loading Current
120
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5
5 Page 
NCP1417
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.
TYPICAL APPLICATION CIRCUIT
Input
1 V to
VOUT
308 K
RLB1
Shutdown
Open Drain
Input
Low Battery
Open Drain
Output 1
CIN
10 μF
RFB2
200 K
CFB1
150 pF
RFB1
355 K
1
2
3
RLB2 4
330 K
NCP1417
FB OUT
LBI/SHDN LX
LB01
GND
REF
LB02
56 nF
CSHDN
150 nF
CREF
8
7
6
5
L
22 μH
33 μF
COUT
+
VOUT = 3.3 V/200 mA max.
Low Battery
Open Drain
Output 2
Figure 28. Typical Application Schematic for 2 Alkaline Cells Supply
GENERAL DESIGN PROCEDURES
Switch mode converter design is considered as black
magic to most engineers, some complicate empirical
formulae are available for reference usage. Those formulae
are derived from the assumption that the key components,
i.e. power inductor and capacitors are available with no
tolerance. Practically, its not true, the result is not a matter
of how accurate the equations you are using to calculate the
component values, the outcome is still somehow away from
the optimum point. Following, is a simple method based on
the most basic first order equations to estimate the inductor
and capacitor values for NCP1417 operating in Continuous
Conduction Mode. The component value set can be used as
a starting point to fine tune the circuit operation. By all
means, detail bench testing is needed to get the best
performance out of the circuit.
Design Parameters:
VIN = 1.8 V to 3.0 V, Typical 2.4 V
VOUT = 3.3 V
IOUT = 150 mA (200 mA max)
VLB1 = 2.3 V; VLB2 [ 0.8 VLB1 = 1.84 V
VOUT−RIPPLE = 40 mVP−P at IOUT = 200 mA
Calculate the feedback network:
Select RFB2 = 200 K
ǒ ǓRFB1 + RFB2
VOUT
VREF
*
1
ǒ ǓRFB1 + 200 K
3.3 V
1.19 V
*
1
+ 355 K
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet NCP1417.PDF ] | |
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