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NCV8843DG

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
© Semiconductor Components Industries, LLC, 2013
December, 2013 − Rev. 11
1 Publication Order Number:
NCV8843/D
NCV8843
1.5 A, 340 kHz, Buck
Regulator with
Synchronization Capability
The NCV8843 is a 1.5 A buck regulator IC operating at a
fixed−frequency of 340 kHz. The device uses the V
2
t control
architecture to provide unmatched transient response, the best overall
regulation and the simplest loop compensation for today’s high−speed
logic. The NCV8843 accommodates input voltages from 4.0 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
• V
2
Architecture Provides Ultra−Fast Transient Response, Improved
Regulation and Simplified Design
• Wide Operating Range: 4 V to 40 V
• 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
• Exposed Pad Packages for Enhanced Thermal Characteristics
• NCV Prefix for Automotive and Other Applications Requiring Site
and Change Control
• These are Pb−Free Devices
MARKING
DIAGRAMS
http://onsemi.com
SO−16W EP
PW SUFFIX
CASE 751AG
1
16
NCV8843
AWLYYWWG
1
16
DFN18
MN SUFFIX
CASE 505
NCV8843
AWLYYWW G
G
11
8
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
E = Automotive Grade
G or G = Pb−Free Package
(Note: Microdot may be in either location)
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
ORDERING INFORMATION
1
18
1
8
SOIC−8
D SUFFIX
CASE 751
V8843
ALYWE
G
1
8
NCV8843
http://onsemi.com
2
Figure 1. Application Diagram, 7.0 V − 16 V to 3.3 V @ 1.0 A Converter
D2
Vout (3.3 V)
Vin (7 V to 16 V)
D1
R2
100
R3
162
+
U1
NC
NC
NC
NC
SYNC
NC
NC
NC
Vsw
SHDNB
NC
Vfb
Vc
BOOST
Vin
GND
EPAD
+
R6
100k
SHDNB
SYNC
C3
100 mF
L1
18 mH
C1
0.1 mF
NCV8843
C4
0.1 mF
C5
0.1 mF
C2
330 mF
MAXIMUM RATINGS*
Rating Value Unit
Peak Transient Voltage (31 V Load Dump @ V
IN
= 14 V) 45 V
Operating Junction Temperature Range, T
J
−40 to 150 °C
Lead Temperature Soldering: Reflow: (Note 1) 260 peak
(Note 2)
°C
Storage Temperature Range, T
S
−65 to +150 °C
ESD (Human Body Model)
(Machine Model)
(Charge Device Model)
2.0
200
>1.0
kV
V
kV
Package Thermal Resistance
SO−16W EPAD Junction−to−Case, R
q
JC
SO−16W EPAD Junction−to−Ambient, R
q
JA
(Note 3)
DFN18 Junction−to−Ambient, R
q
JA
(Note 3)
SO−8 Junction−to−Ambient, R
q
JA
(Note 4)
16
35
38
100
°C/W
°C/W
°C/W
°C/W
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
*The maximum package power dissipation must be observed.
1. 60 second maximum above 183°C.
2. −5°C/0°C allowable conditions.
3. 4 layer board, 1 oz copper outer layers, 0.5 oz copper inner layers, 600 sq mm copper area.
4. 1 in
2
, 1 oz copper area used for heatsinking.
MAXIMUM RATINGS (Voltages are with respect to GND)
Pin Name V
Max
V
MIN
I
SOURCE
I
SINK
V
IN
(DC)* 40 V −0.3 V N/A 4.0 A
BOOST 40 V −0.3 V N/A 100 mA
V
SW
40 V −0.6 V/−1.0 V, t < 50 ns 4.0 A 10 mA
V
C
7.0 V −0.3 V 1.0 mA 1.0 mA
SHDNB 7.0 V −0.3 V 1.0 mA 1.0 mA
SYNC 7.0 V −0.3 V 1.0 mA 1.0 mA
V
FB
7.0 V −0.3 V 1.0 mA 1.0 mA
*See table above for load dump.
NCV8843
http://onsemi.com
3
PACKAGE PIN DESCRIPTION
SO−8
SO−16W
EPAD
DFN−18
PIN SYM-
BOL
FUNCTION
1 15 1 BOOST The BOOST pin provides additional drive voltage to the on−chip NPN power tran-
sistor. The resulting decrease in switch on voltage increases efficiency.
2 16 2−4 V
IN
This pin is the main power input to the IC.
3 1 5−7 V
SW
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 negative
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.
4 2 8 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 pulled up to V
CC
with resistor.
5 7 10
SYNC External synchronization single input, with 60k internal pull−down resistor. If not
used, leave unconnected or connect to GND.
6 8 13 GND Power return connection for the IC.
7 9 16 V
FB
The FB pin provides input to the inverting input of the error amplifier. If V
FB
is lower
than 0.29 V, the oscillator frequency is divided by four, and current limit folds back
to about 1 A. These features protect the IC under severe overcurrent or short cir-
cuit conditions.
8 10 17 V
C
The V
C
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.
− 3 − 6,
11 − 14
9, 11, 12,
14, 15, 18
NC No Connection
− EPAD EPAD − Exposed die attach pad. Internally connected to GND. External connection to GND
is optional.
PIN CONNECTIONS
1
16
V
FB
GND
V
C
SYNC
NC
NC
NC
NC
NCNC
NCNC
BOOSTSHDNB
V
IN
V
SW
BOOST
NC
SO−16W EPAD
DFN18
118
V
IN
V
C
V
IN
V
FB
V
IN
NC
V
SW
NC
V
SW
GND
V
SW
NC
SHDNB
NC
NC SYNC
217
316
415
514
613
712
811
910
1
8
SYNCSHDNB
GNDV
SW
V
FB
V
IN
V
C
BOOST
SO−8
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

NCV8843DG

Mfr. #:
Buy NCV8843DG
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators 340 KHZ REGULATOR
Lifecycle:
New from this manufacturer.
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