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부품번호 | NCP1512 기능 |
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기능 | PWM Buck Converter | ||
제조업체 | ON Semiconductor | ||
로고 | |||
NCP1512
Advance Information
PWM Buck Converter with a
Very Low Iq During Low
Load Conditions
The NCP1512 is a tri-mode regulator that operates either as a
Synchronized PWM Buck Converter, PWM Buck Converter with
internal oscillator or as a Pulsed Switching Regulator. If a
synchronization signal is present, the NCP1512 operates as a current
mode PWM converter with synchronous rectification. The optional
external frequency input signal allows the user to control the location
of the spurious frequency noise generated by a PWM converter. The
Pulsed Switching Regulator mode is active when the Sync Pin is
Low. The Pulsed Mode is an extremely low quiescent current Buck
Converter. NCP1512 operates in a PWM mode with an internal
oscillator when the Sync Pin is held high. The NCP1512
configuration allows the flexibility of efficient high power operation
and low input current during system sleep modes.
Features
• Synchronous Rectification for Higher Efficiency in PWM Mode
• Pulsed Switching Mode Operation for Low Current Consumption at
Low Loads
• Integrated MOSFETs and Feedback Circuits
• Cycle -by-Cycle Current Limit
• Automatic Switching Between PWM, with External or Internal
Oscillator, and Pulsed Mode
• Operating Frequency Range of 450 to 1000 kHz
• Internal 1.0 MHz Oscillator
• Thermal Limit Protection
• Built -in Slope Compensation for Current Mode PWM Converter
• 2.5, 2.85, 3.0, 3.3 Fixed Output Voltages
• Shutdown Current Consumption of 0.2 mA
• Pb Free Package for Green Manufacturing
Applications
• Cellular Phones and Pagers
• PDA
• Digital Cameras
• Supplies for DSP Cores
• Portable Applications
This document contains information on a new product. Specifications and information
herein are subject to change without notice.
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MARKING
DIAGRAM
9 PIN
MICRO BUMP
FC SUFFIX
CASE 499E
XXXX
YYWW
1
XX = Device Code
YY = Year
WW = Work Week
PIN CONNECTIONS
Pin: A1. - GNDP
A1 B1 C1
A2. - LX
A3. - VCC
B1. - SYNC
A2 B2 C2
B2. - GNDA
B3. - FB
C1. - SHD
A3 B3 C3
C2. - CB1
C3. - CB0
(Bottom View)
ORDERING INFORMATION
Device
Package
Shipping
NCP1512FCT1G 9 Pin Pb Free
Micro Bump
TBD
© Semiconductor Components Industries, LLC, 2003
June, 2003 - Rev. 0
1
Publication Order Number:
NCP1512/D
NCP1512
ELECTRICAL CHARACTERISTICS (Vin = 3.6 V, Vo = 3.0 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
VCC Pin
Quiescent Current of Sync Mode, Iout = 0 mA
Quiescent Current of PWM Mode, Iout = 0 mA
Quiescent Current of Pulsed Mode, Iout = 0 mA
Quiescent Current, SHD Low
Iq PWM
Iq PWM
Iq Pulsed
Iq Off
-
-
-
-
175 - mA
185 - mA
14 - mA
0.1 1.0 mA
Input Voltage Range
Vin 2.5 - 5.2 V
Sync Pin
Input Voltage
Vsync
- 0.3
- Vcc + 0.3 V
Frequency Operational Range
Fsync
450
600
1000
kHz
Minimum Synchronization Pulse Width
Dcsync Min
-
30
-%
Maximum Synchronization Pulse Width
Dcsync Max
-
70
-%
SYNC “H” Voltage Threshold
Vsynch
-
920
1200
mV
SYNC “L” Voltage Threshold
Vsyncl 400 830
- mV
SYNC “H” Input Current, Vsync = 3.6 V
Isynch - 2.2 - mA
SYNC “L” Input Current, Vsync = 0 V
Isyncl
- 0.5
-
- mA
Output Level Selection Pins
Input Voltage
Vcb -0.3 - Vcc + 0.3 V
CB0, CB1 “H” Voltage Threshold
Vcb h
-
920
1200
mV
CB0, CB1 “L” Voltage Threshold
Vcb l
400 830
- mV
CB0, CB1 “H” Input Current, CB = 3.6 V
Icb h
- 2.2 - mA
CB0, CB1 “L” Input Current, CB = 0 V
Icb l -0.5 -
- mA
Shutdown Pin
Input Voltage
Vshd -0.3 - Vcc + 0.3 V
SHD “H” Voltage Threshold
Vshd h
-
920
1200
mV
SHD “L” Voltage Threshold
Vshd l
400 830
- mV
SHD “H” Input Current, SHD = 3.6 V
SHD “L” Input Current, SHD = 0 V
Ishd h - 2.2
Ishd l -0.5 -
- mA
- mA
Feedback Pin
Input Voltage
Vfb -0.3 - Vcc + 0.3 V
Input Current, Vfb = 1.5 V
Ifb - 5.0 7.5 mA
Sync PWM Mode Characteristics
Switching P-FET Current Limit
I lim - 800 - mA
Duty Cycle
DC - - 100 %
Minimum On Time
Ton min
-
75
- nsec
Rdson Switching P-FET and N_FET
Rdson - 0.23 - W
Switching P-FET and N-FET Leakage Current
Ileak - 0 10 mA
Output Overvoltage Threshold
Vo - 5.0 - %
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4
4페이지 NCP1512
Sync
Vbat
C1
10 m
Set
En Ramp R1
IQ1
R2
OC Detect
COMP
+
-
Latch
SQ
R En
Vref+5%
+ Error Amp
- OVP
COMP
Vref
Q1 L1
6.8 mH
R3
Q2 R4
LOAD
C2
10 m
Figure 3. PWM Circuit Schematic
3.6040
3.6000
3.5960
400 m
200 m
0.00
VIN
IPFET
400 m
300 m
200 m
IL
400 m
100 m
-200 m
INFET
3.01
3.00
2.99
VO
3.70 VLX
2.00
- 0.30
196.0
201.0
204.0
TIME (m)
207.0
Figure 4. Waveforms During PWM Operation
210.0
213.0
PWM Mode with Internal Oscillator
If a synchronization signal is not available, the converter
has a 1.0 MHz internal oscillator available. The Sync Pin
must be held high to enter this mode. The characteristics of
the PWM mode with internal oscillator are similar to the
Sync PWM Mode.
Pulsed Mode
During low-level current output, NCP1512 can enter a
low current consumption mode when the Sync Pin is held
low. This mode will typically have a free running frequency
and an output voltage ripple similar to a PFM mode. The
advantage of the Pulsed mode is much lower Iq (14 mA) and
drastically higher efficiency compared with PWM and
PFM modes in low output loads.
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부품번호 | 상세설명 및 기능 | 제조사 |
NCP1512 | PWM Buck Converter | ON Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |