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PDF NCP1400A Data sheet ( Hoja de datos )
| Número de pieza | NCP1400A | |
| Descripción | Fixed Frequency PWM Step-Up Micropower Switching Regulator | |
| Fabricantes | ON Semiconductor | |
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NCP1400A
100 mA, Fixed Frequency
PWM Step−Up Micropower
Switching Regulator
The NCP1400A series are micropower step−up DC to DC
converters that are specifically designed for powering portable
equipment from one or two cell battery packs. These devices are
designed to startup with a cell voltage of 0.8 V and operate down to
less than 0.2 V. With only four external components, this series allows
a simple means to implement highly efficient converters that are
capable of up to 100 mA of output current.
Each device consists of an on−chip fixed frequency oscillator, pulse
width modulation controller, phase compensated error amplifier that
ensures converter stability with discontinuous mode operation,
soft−start, voltage reference, driver, and power MOSFET switch with
current limit protection. Additionally, a chip enable feature is provided
to power down the converter for extended battery life.
The NCP1400A device series are available in the Thin SOT23−5
package with seven standard regulated output voltages. Additional
voltages that range from 1.8 V to 4.9 V in 100 mV steps can be
manufactured.
Features
• Extremely Low Startup Voltage of 0.8 V
• Operation Down to Less than 0.2 V
• Only Four External Components for Simple Highly Efficient
Converters
• Up to 100 mA Output Current Capability
• Fixed Frequency Pulse Width Modulation Operation
• Phase Compensated Error Amplifier for Stable Converter Operation
• Chip Enable Power Down Capability for Extended Battery Life
• Pb−Free Packages are Available
Typical Applications
• Cellular Telephones
• Pagers
• Personal Digital Assistants
• Electronic Games
• Digital Cameras
• Camcorders
• Handheld Instruments
• White LED Torch Light
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5
1
THIN SOT23−5
SN SUFFIX
CASE 483
PIN CONNECTIONS AND
MARKING DIAGRAM
CE 1
5 LX
OUT 2
NC 3
4 GND
(Top View)
xxx = Marking
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 2 of this data sheet.
VIN CE
1
OUT
2
NC
3
LX
5
GND
4
VOUT
Figure 1. Typical Step−Up Converter
Application
© Semiconductor Components Industries, LLC, 2006
March, 2006 − Rev. 11
1
Publication Order Number:
NCP1400A/D
1 page  
NCP1400A
2.1 3.4
2.0
VIN= 1.5 V
1.9
VIN= 0.9 V VIN= 1.2 V
1.8
1.7 NCP1400ASN19T1
L = 22 mH
TA = 25°C
1.6
0
20 40 60 80 100
IO, OUTPUT CURRENT (mA)
Figure 2. NCP1400ASN19T1 Output Voltage
vs. Output Current
6.0
3.2
VIN= 2.0 V
3.0
VIN= 0.9 V
2.8
VIN= 1.2 V VIN= 1.5 V
NCP1400ASN30T1
2.6 L = 22 mH
TA = 25°C
2.4
0 20 40 60 80 100
IO, OUTPUT CURRENT (mA)
Figure 3. NCP1400ASN30T1 Output Voltage
vs. Output Current
100
5.5
5.0
VIN= 0.9 V
4.5
VIN= 1.5 V
VIN= 3.0 V
VIN= 2.0 V
NCP1400ASN50T1
4.0 L = 22 mH
TA = 25°C
3.5
0
20 40
60 80 100
IO, OUTPUT CURRENT (mA)
Figure 4. NCP1400ASN50T1 Output Voltage
vs. Output Current
100
80
60 VIN= 0.9 V
VIN= 2.5 V
VIN= 1.2 V
VIN= 2.0 V
VIN= 1.5 V
40
NCP1400ASN30T1
20 L = 22 mH
TA = 25°C
0
0 20 40 60 80 100
IO, OUTPUT CURRENT (mA)
Figure 6. NCP1400ASN30T1 Efficiency vs.
Output Current
80
VIN= 1.5 V
60 VIN= 1.2 V
VIN= 0.9 V
40
NCP1400ASN19T1
20 L = 22 mH
TA = 25°C
0
0 20 40 60 80 100
IO, OUTPUT CURRENT (mA)
Figure 5. NCP1400ASN19T1 Efficiency vs.
Output Current
100
80
VIN= 0.9 V
60
VIN= 1.5 V
VIN= 3.0 V
VIN= 2.0 V
40
NCP1400ASN50T1
20 L = 22 mH
TA = 25°C
0
0 20 40 60 80 100
IO, OUTPUT CURRENT (mA)
Figure 7. NCP1400ASN50T1 Efficiency vs.
Output Current
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5
5 Page 
NCP1400A
VIN = 1.5 V, L = 22 mH
1. VOUT = 5.0 V (AC coupled), 50 mV/div
2. IO = 3.0 mA to 30 mA
Figure 38. NCP1400ASN50T1
Load Transient Response
VIN = 1.5 V, L = 22 mH
1. VOUT = 5.0 V (AC coupled), 50 mV/div
2. IO = 30 mA to 3.0 mA
Figure 39. NCP1400ASN50T1
Load Transient Response
OUT
2
NC
3
GND
4
ERROR
+ AMP
−
PHASE
COMPENSATION
VOLTAGE
REFERENCE
SOFT−START
VLX LIMITER
DRIVER
PWM
CONTROLLER
180 kHz
OSCILLATOR
LX
5
POWER
SWITCH
1 CE
Figure 40. Representative Block Diagram
PIN FUNCTION DESCRIPTION
Pin #
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ4
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ5
Symbol
CE
OUT
NC
GND
LX
Pin Description
Chip Enable Pin
(1) The chip is enabled if a voltage equal to or greater than 0.9 V is applied.
(2) The chip is disabled if a voltage less than 0.3 V is applied.
(3) The chip is enabled if this pin is left floating.
Output voltage monitor pin and also the power supply pin for the device.
No internal connection to this pin.
Ground pin.
External inductor connection pin to power switch drain.
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet NCP1400A.PDF ] | |
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