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부품번호 | NCP1596 기능 |
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기능 | 1.5 MHz Current Mode PWM Buck Down Converter | ||
제조업체 | ON Semiconductor | ||
로고 | |||
전체 12 페이지수
NCP1596, NCP1596A
Product Preview
1.5 A, 1.5 MHz Current
Mode PWM Buck Down
Converter
The NCP1596/NCP1596A is a current mode PWM buck converter
with integrated power switch. It can provide up to 1.5 A output current
with high conversion efficiency. High frequency PWM control
scheme can provide a low output ripple noise. Thus, it allows the
usage of small size passive components to reduce the board space. In a
low load condition, the controller will automatically change to PFM
mode which provides a higher efficiency at low load. Additionally, the
device includes soft−start, thermal shutdown with hysteresis,
cycle−by−cycle current limit, and short circuit protection. This device
is available in a compact 3x3 DFN package.
Features
• High Efficiency up to 90%, 1 A @ 3.3 V, 75% @ 1.2 V
• Fully Internal Compensation
• Low Output Voltage Ripple, 20 mV Typical
• ±1.5% Reference Voltage
• High PWM Switching Frequency, 1.5 MHz
• Automatic PWM / PFM Switchover at Light Load
• Built−in 1 ms Digital Soft Start
• Cycle−by−cycle Current Limit
• Thermal Shutdown with Hysteresis
• Internal UVLO Protection
• Ext. Adjustable Output Voltage
• Low Profile and Minimum External Components
• Designed for use with Ceramic Capacitor
• Compact 3x3 DFN Package
• These are Pb−Free Devices
Typical Applications
• Hard Disk Drives
• USB Power Device
• Wireless and DSL Modems
http://onsemi.com
1
6 PIN DFN 3x3
MN SUFFIX
CASE 506AH
MARKING DIAGRAMS
1 N1596
ALYW
G
1 1596A
ALYW
G
N1596/1596A = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
PIN CONNECTIONS
FB
GND
LX
1596
NC
VCC
VCCP
FB
GND
LX
(Top View)
EN
VCC
VCCP
1596A
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2009
March, 2009 − Rev. P3
1
Publication Order Number:
NCP1596/D
NCP1596, NCP1596A
PIN FUNCTION DESCRIPTIONS
Pin #
Symbol
Pin Description
NCP1596
1 FB Feedback pin. Part is internally compensated. Only necessary to place a voltage divider or connect the out-
put directly to this pin.
2
GND
Ground
3 LX Pin connected internally to power switch. Connect externally to inductor.
4
VCCP
Power connection to the power switch.
5
VCC
IC power connection.
6 NC No Connection
NCP1596A
1 FB Feedback pin. Part is internally compensated. Only necessary to place a voltage divider or connect the out-
put directly to this pin.
2
GND
Ground
3 LX Pin connected internally to power switch. Connect externally to inductor.
4
VCCP
Power connection to the power switch.
5
VCC
IC power connection.
6 EN Device Enable pin. This pin has an internal current source pull up. No connect is enable the device. With this
pin pulled down below 0.8 V, the device is disabled and enters the shutdown mode.
NC/EN
Vin VCC
500 nA
C1
Isense
FB
Short
circuit
protect
UVLO
Thermal
Shutdown
Soft Start
0.8 V
disable
Isense
Oscillator
SQ
driver
R Q Ton(min)
VCCP
Vout = 0.8 V to 0.9 V * Vin
LX L1
D1
GND
R1
R2
C2
Figure 2. Detail Block Diagram
EXTERNAL COMPONENT REFERENCE DATA
Device
VOUT
3.3 V
Inductor Model
CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
Inductor (L1)
3.3 mH
NCP1596/
NCP1596A
2.5 V
1.5 V
CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
3.3 mH
3.3 mH
1.2 V CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
3.3 mH
Diode (D1)
MBRA210LT3G
MBRA210LT3G
MBRA210LT3G
MBRA210LT3G
CIN (C1)
22 mF
22 mF x 2
22 mF
22 mF x 2
22 mF
22 mF x 2
22 mF
22 mF x 2
COUT (C2)
R1
R2
22 mF
22 mF x 2
31 k 10 k
22 mF
22 mF x 2
21 k 10 k
22 mF
22 mF x 2
8 k 10 k
22 mF
22 mF x 2
5 k 10 k
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4
4페이지 NCP1596, NCP1596A
1.5
1.0
0.5
VIN = 5.0 V
0.0
−0.5
VOUT = 3.3 V
VIN = 4.0 V
−1.0
L = 3.3 mH
CIN = 22 mF
−1.5 COUT = 22 mF
1
10
100
1000
10000
OUTPUT CURRENT
Figure 11. Output Voltage Change vs. Output
Current
100
VIN = 4.0 V
90
80
VIN = 5.0 V
70
60
50
40
30
10
VOUT = 3.3 V
L = 3.3 mH
CIN = 22 mF
COUT = 22 mF
100
1000
10000
OUTPUT CURRENT
Figure 12. Efficiency vs. Output Current
1.5
1.0
0.5
0.0
−0.5
−1.0
−1.5
1
VIN = 5.0 V
VIN = 4.0 V
VOUT = 1.8 V
L = 3.3 mH
CIN = 22 mF
COUT = 22 mF
10 100 1000
OUTPUT CURRENT
10000
Figure 13. Output Voltage Change vs.
Output Current
100
90 VIN = 4.0 V
80 VIN = 5.0 V
70
60
50
40
3010
VOUT = 1.8 V
L = 3.3 mH
CIN = 22 mF
COUT = 22 mF
100
1000
10000
OUTPUT CURRENT
Figure 14. Efficiency vs. Output Current
1.5
1.0
0.5
VIN = 5.0 V
0.0
−0.5
−1.0
−1.5
1
VOUT = 1.2 V
L = 3.3 mH
CIN = 22 mF
COUT = 22 mF
VIN = 4.0 V
10
100
1000
10000
OUTPUT CURRENT
Figure 16. Output Voltage Change vs.
Output Current
100
90
VIN = 4.0 V
80
70 VIN = 5.0 V
60
50
40
3010
VOUT = 1.2 V
L = 3.3 mH
CIN = 22 mF
COUT = 22 mF
100 1000
OUTPUT CURRENT
10000
Figure 15. Efficiency vs. Output Current
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7
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구 성 | 총 12 페이지수 | ||
다운로드 | [ NCP1596.PDF 데이터시트 ] |
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