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PDF LPO4812 Data sheet ( Hoja de datos )
| Número de pieza | LPO4812 | |
| Descripción | High Efficiency Synchronous Step-Down DC-DC Converter | |
| Fabricantes | ON Semiconductor | |
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NCP1511
Up to 500 mA, High
Efficiency Synchronous
Step−Down DC−DC Converter
in Chip Scale Package
The NCP1511 step−down PWM DC−DC converter is optimized
for portable applications powered from 1−cell Li−ion or 3−cell
Alkaline/NiCd/NiMH batteries. This DC−DC converter utilizes a
current−mode control architecture for easy compensation and better
line regulation. It also uses synchronous rectification to increase
efficiency and reduce external part count. The NCP1511 optimizes
efficiency in light load conditions when switched from a normal
PWM mode to a “pulsed switching” mode. The device also has a
built−in oscillator for the PWM circuitry, or it can be synchronized to
an external 500 kHz to 1000 kHz clock signal. Finally, it includes an
integrated soft−start, cycle−by−cycle current limiting, and thermal
shutdown protection. The NCP1511 is available in a chip scale
package.
Features
• High Efficiency:
93% for 1.89 V Output at 3.6 V Input and 150 mA Load Current
92% for 1.89 V Output at 3.6 V Input and 300 mA Load Current
• Digital Programmable Output Voltages: 1.0, 1.3, 1.5 or 1.89 V
• Output Current up to 500 mA at Vin = 3.6 V
• Low Quiescent Current of 14 mA in Pulsed Switching Mode
• Low 0.1 mA Shutdown Current
• −30°C to 85°C Operation Temperature
• Ceramic Input/Output Capacitor
• 9 Pin Chip Scale Package
• Pb−Free Package is Available
Applications
• Cellular Phones, Smart Phones and PDAs
• Digital Still Cameras
• MP3 Players and Portable Audio Systems
• Wireless and DSL Modems
• Portable Equipment
Vin
2.5 V − 5.2 V
A3 VCC
Cin
10 mF C1
SHD
B1 SYNC
LX A2 6.8 mH
B3
FB
Vout
Cout
22 mF
C2
CB1 CB0 and CB1
CB0 C3 Control Input
GNDA GNDP
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100
90
80
70
60
50
40
30
20
10
0
0.1
Figure 1. Typical Application Circuit
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9 PIN
MICRO BUMP
FC SUFFIX
A1 CASE 499AC
XX = Device Code
A = Assembly Location
Y = Year
WW = Work Week
MARKING
DIAGRAM
DAL
AYWW
A1
PIN CONNECTIONS
A1 B1 C1
A2 B2 C2
A3 B3 C3
(Bottom View)
Pin: A1. − GNDP
A2. − LX
A3. − VCC
B1. − SYNC
B2. − GNDA
B3. − FB
C1. − SHD
C2. − CB1
C3. − CB0
ORDERING INFORMATION
Device
Package
Shipping†
NCP1511FCT1 Micro Bump 3000 Tape & Reel
NCP1511FCT1G Micro Bump 3000 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.
Pulsed Mode
PWM Mode
Vin = 3.6 V
Vout = 1.5 V
TA= 25°C
1 10 100 1000
Iout (mA)
Figure 2. Efficiency vs. Output Current
© Semiconductor Components Industries, LLC, 2005
January, 2005 − Rev. 5
1
Publication Order Number:
NCP1511/D
1 page  
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NCP1511
ELECTRICAL CHARACTERISTICS (continued) (Vin = 3.6 V, Vo = 1.5 V, TA = 25°C, Fsyn = 600 kHz 50% Duty Cycle square wave
for PWM mode; TA = –30 to 85°C for Min/Max values, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max Unit
Sync PWM Mode Characteristics (continued)
Feedback Voltage Accuracy, Vout Set = 1.0 V CB0 = L, CB1 = L
Feedback Voltage Accuracy, Vout Set = 1.3 V CB0 = L, CB1 = H
Feedback Voltage Accuracy, Vout Set = 1.5 V CB0 = H, CB1 = H
Feedback Voltage Accuracy, Vout Set = 1.89 V CB0 = H CB1 = L
Load Transient Response
10 to 100 mA Load Step
Vout
0.950
1.000
1.050
V
Vout
1.261
1.300
1.339
V
Vout
1.450
1.500
1.550
V
Vout
1.833
1.890
1.947
V
Vout − 35 − mV
Line Transient Response, Iout = 100 mA
3.0 to 3.6 Vin Line Step
Vout − "10 − mVpp
PWM Mode with Internal Oscillator Characteristics
Switching P−FET Current Limit
Minimum On Time
Internal Oscillator Frequency
Rdson Switching P−FET and N_FET
Switching P−FET and N−FET Leakage Current
Output Overvoltage Threshold
I lim − 800 − mA
Ton min
−
75
− nsec
Fosc
700 900 1200 kHz
Rdson − 0.23 −
W
Ileak − 0 1.0 mA
Vo
− 5.0 −
%
Feedback Voltage Accuracy, Vout Set = 1.0 V CB0 = L, CB1 = L
Feedback Voltage Accuracy, Vout Set = 1.3 V CB0 = L, CB1 = H
Feedback Voltage Accuracy, Vout Set = 1.5 V CB0 = H, CB1 = H
Feedback Voltage Accuracy, Vout Set = 1.89 V CB0 = H CB1 = L
Load Transient Response
10 to 100 mA Load Step
Vout
0.950
1.000
1.050
V
Vout
1.261
1.300
1.339
V
Vout
1.450
1.500
1.550
V
Vout
1.833
1.890
1.947
V
Vout − 35 − mV
Line Transient Response, Iout = 100 mA
3.0 to 3.6 Vin Line Step
Vout − "10 − mVpp
Pulsed Mode Characteristics
On Time
Output Ripple Voltage, Iout = 100 mA
Feedback Voltage Accuracy, Vout Set = 1.0 V CB0 = L, CB1 = L
Feedback Voltage Accuracy, Vout Set = 1.3 V CB0 = L, CB1 = H
Feedback Voltage Accuracy, Vout Set = 1.5 V CB0 = H, CB1 = H
Feedback Voltage Accuracy, Vout Set = 1.89 V CB0 = H CB1 = L
Ton − 660 − nsec
Vout − 22 − mV
Vout
0.930
1.000
1.070
V
Vout
1.241
1.300
1.359
V
Vout
1.430
1.500
1.570
V
Vout
1.813
1.890
1.967
V
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NCP1511
Table 1. Operating Mode Selection
SYNC Pin State
Operating Mode
LOW
Pulsed Mode (PM)
HIGH
PWM, 1 MHz Switch Frequency
CLOCK
PWM, Frequency Synchronization
Output Voltage Selection
The output voltage is digitally programmed to one of
four voltage levels depending on the logic state of CB0 and
CB1. Therefore if the NCP1511’s load, such as a digital
cellular phone’s baseband processor, supports dynamic
power management, the device can lower or raise its core
voltage under software control. When combined with the
pulsed current mode function in low load situations, this
active voltage management further stretches the useful
operating life of the handset battery between charges.
The output voltage levels are listed in Table 2. The CB0
has a pull down resistor and the CB1 has a pullup resistor.
The default output voltage is 1.3 V when CB0 and CB1 are
floating.
Table 2. Truth Table for CB0 and CB1 with the
Corresponding Output Voltage
CB0
CB1
Vout(V)
0 0 1.0
0 1 1.3
1 1 1.5
1 0 1.89
Soft−Start
The NCP1511 uses soft−start to limit the inrush current
when the device is initially powered up or enabled.
Soft−start is implemented by gradually increasing the
reference voltage until it reaches the full reference voltage.
During startup, a pulsed current source charges the internal
soft−start capacitor to provide gradually increasing
reference voltage for the PWM loop. When the voltage
across the capacitor ramps up to the nominal reference
voltage, the pulsed current source will be switched off and
the reference voltage will switch to the regular reference
voltage.
Shutdown Mode
When the SHD pin has a voltage applied of less than
0.4 V, the NCP1511 will be disabled. In shutdown mode,
the internal reference, oscillator and most of the control
circuitries are turned off. Therefore, the typical current
consumption will be 0.1 mA (typical value).
Applying a voltage above 1.2 V to SHD pin will enable
the device for normal operation. The device will go through
soft−start to normal operation.
Thermal Shutdown
Internal Thermal Shutdown circuitry is provided to
protect the integrated circuit in the event that the maximum
junction temperature is exceeded. If the junction
temperature exceeds 160°C, the device shuts down. In this
mode switch Q1 and Q2 and the control circuits are all
turned off. The device restarts in soft−start after the
temperature drops below 135_C. This feature is provided
to prevent catastrophic failures from accidental device
overheating and it is not intended as a substitute for proper
heatsinking.
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LPO4812.PDF ] | |
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