NCV8842 PDF даташит
Спецификация NCV8842 изготовлена «ON Semiconductor» и имеет функцию, называемую «Buck Regulator». |
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Детали детали
Номер произв | NCV8842 |
Описание | Buck Regulator |
Производители | ON Semiconductor |
логотип |
15 Pages
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NCV8842
1.5 A, 170 kHz, Buck
Regulator with
Synchronization Capability
The NCV8842 is a 1.5 A buck regulator IC operating at a
fixed−frequency of 170 kHz. The device uses the V2t control
architecture to provide unmatched transient response, the best overall
regulation and the simplest loop compensation for today’s high−speed
logic. The NCV8842 accommodates input voltages from 4.5 V to 40 V
and contains synchronization circuitry.
The on−chip NPN transistor is capable of providing a minimum of
1.5 A of output current, and is biased by an external “boost” capacitor
to ensure saturation, thus minimizing on−chip power dissipation.
Protection circuitry includes thermal shutdown, cycle−by−cycle
current limiting and frequency foldback.
Features
• V2 Architecture Provides Ultra−Fast Transient Response, Improved
Regulation and Simplified Design
• 2.0% Error Amp Reference Voltage Tolerance
• Switch Frequency Decrease of 4:1 in Short Circuit Conditions
Reduces Short Circuit Power Dissipation
• BOOST Lead Allows “Bootstrapped” Operation to Maximize
Efficiency
• Sync Function for Parallel Supply Operation or Noise Minimization
• Shutdown Lead Provides Power−Down Option
• 1.0 mA Quiescent Current During Power−Down
• Thermal Shutdown
• Soft−Start
• Internally Fused Leads in SO−16L Package
• NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
• Pb−Free Packages are Available
http://onsemi.com
MARKING
DIAGRAMS
16
16
1
SO−16 WB
PW SUFFIX
CASE 751AG
NCV8842
AWLYYWWG
1
1
18
18
18−LEAD DFN NCV8842
1 MN SUFFIX AWLYYWW G
CASE 505
G
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
E = Automotive Grade
G or G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
October, 2006 − Rev. 1
1
Publication Order Number:
NCV8842/D
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Vout (3.3 V)
D1
L1
27 mH
C1
1 mF
C3 +
100 mF
R3
205
R2
127
D2
NCV8842
R6
10k
U1
Vsw Vin
SHDNB
BOOST
NC NC
NC NC
NC NC
NC NC
SYNC
Vc
GND
Vfb
NCV8842
C5
0.1 mF
C4
0.1 mF
Vin (7 V to 16 V)
+ C2
330 mF
SHDNB
SYNC
Figure 1. Application Diagram, 4.5 V − 16 V to 3.3 V @ 1.0 A Converter
MAXIMUM RATINGS*
Rating
Value
Unit
Peak Transient Voltage (31 V Load Dump @ VIN = 14 V)
Operating Junction Temperature Range, TJ
Lead Temperature Soldering:
Reflow: (Note 1)
45
−40 to 150
240 peak
(Note 2)
V
°C
°C
Storage Temperature Range, TS
ESD
(Human Body Model)
(Machine Model)
(Charge Device Model)
−65 to +150
2.0
200
>1.0
°C
kV
V
kV
Package Thermal Resistance
SO−16 Junction−to−Case, RqJC
SO−16 Junction−to−Ambient, RqJA
18−Lead DFN Junction−to−Ambient, RqJA
16
57
35
°C/W
°C/W
°C/W
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
*The maximum package power dissipation must be observed.
1. 60 second maximum above 183°C.
2. −5°C/0°C allowable conditions.
MAXIMUM RATINGS (Voltages are with respect to GND)
Pin Name
VIN (DC)*
BOOST
VMax
40 V
40 V
VMIN
−0.3 V
−0.3 V
VSW
VC
SHDNB
40 V
7.0 V
7.0 V
−0.6 V/−1.0 V, t < 50 ns
−0.3 V
−0.3 V
SYNC
7.0 V
−0.3 V
VFB
*See table above for load dump.
7.0 V
−0.3 V
ISOURCE
N/A
N/A
4.0 A
1.0 mA
1.0 mA
1.0 mA
1.0 mA
ISINK
4.0 A
100 mA
10 mA
1.0 mA
1.0 mA
1.0 mA
1.0 mA
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NCV8842
PACKAGE PIN DESCRIPTION
SO−8
SO−16
1 15
2 16
31
42
57
68
79
8 10
− 3 − 6, 11 − 14
PIN SYMBOL
FUNCTION
BOOST
The BOOST pin provides additional drive voltage to the on−chip NPN power
transistor. The resulting decrease in switch on voltage increases efficiency.
VIN
VSW
This pin is the main power input to the IC.
This is the connection to the emitter of the on−chip NPN power transistor and
serves as the switch output to the inductor. This pin may be subjected to nega-
tive voltages during switch off−time. A catch diode is required to clamp the pin
voltage in normal operation. This node can stand −1.0 V for less than 50 ns
during switch node flyback.
SHDNB
The shutdown pin is active low and TTL compatible. The IC goes into sleep
mode, drawing less than 1.0 mA when the pin voltage is pulled below 1.0 V.
This pin should be left floating in normal position.
SYNC
This pin provides the synchronization input.
GND
Power return connection for the IC.
VFB The FB pin provides input to the inverting input of the error amplifier. If VFB is
lower than 0.29 V, the oscillator frequency is divided by four, and current limit
folds back to about 1 ampere. These features protect the IC under severe over-
current or short circuit conditions.
VC The VC pin provides a connection point to the output of the error amplifier and
input to the PWM comparator. Driving of this pin should be avoided because
on−chip test circuitry becomes active whenever current exceeding 0.5 mA is
forced into the IC.
NC No Connection
PIN CONNECTIONS
1
VSW
SHDNB
NC
NC
NC
NC
SYNC
GND
16
VIN
BOOST
NC
NC
NC
NC
VC
VFB
SO−16
BOOST
VIN
VIN
VIN
Vsw
VSW
VSW
SHDNB
NC
1
2
3
4
5
6
7
8
9
18 NC
17 VC
16 VFB
15 NC
14 NC
13 GND
12 NC
11 NC
10 SYNC
18−Lead DFN
http://onsemi.com
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Номер в каталоге | Описание | Производители |
NCV8842 | Buck Regulator | ON Semiconductor |
NCV8843 | Buck Regulator | ON Semiconductor |
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