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NCP1546DG

P1-P3P4-P6P7-P9P10-P12P13-P15
© Semiconductor Components Industries, LLC, 2011
July, 2011 − Rev. 5
1 Publication Order Number:
NCP1546/D
NCP1546
1.5 A, 170 kHz, Buck
Regulator with
Synchronization Capability
The NCP1546 is a 1.5 A buck regulator IC operating at a
fixed−frequency of 170 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 NCP1546 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
• These are Pb−Free Devices
MARKING
DIAGRAM
http://onsemi.com
18−LEAD DFN
MN SUFFIX
CASE 505
1
NCP1546
AWLYYWW G
G
118
18
Device Package Shipping
†
ORDERING INFORMATION
NCP1546DR2G SOIC−8
(Pb−Free)
2500 / Tape & Reel
†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.
(Note: Microdot may be in either location)
1
8
SOIC−8
D SUFFIX
CASE 751
P1546
ALYWE
G
1
8
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
E = Automotive Grade
G = Pb−Free Package
NCP1546MNR2G DFN18
(Pb−Free)
2500 / Tape & Reel
NCP1546DG SOIC−8
(Pb−Free)
98 Units / Rail
NCP1546
http://onsemi.com
2
Figure 1. Application Diagram, 4.5 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
27 mH
C1
1 mF
NCP1546
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
0 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
18−Lead DFN Junction−to−Ambient, R
q
JA
SO−8 Junction−to−Ambient, R
q
JA
(Note 3)
16
100
°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.
3. 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.
NCP1546
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3
PACKAGE PIN DESCRIPTION
SO−8 DFN−18
PIN SYM-
BOL
FUNCTION
1 1 BOOST The BOOST pin provides additional drive voltage to the on−chip NPN power transistor. The
resulting decrease in switch on voltage increases efficiency.
2 2−4 V
IN
This pin is the main power input to the IC.
3 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 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 a resistor.
5 10 SYNC This pin provides the synchronization input.
6 13 GND Power return connection for the IC.
7 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 ampere. These
features protect the IC under severe overcurrent or short circuit conditions.
8 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.
− 9, 11, 12,
14, 15, 18
NC No Connection
− − − Exposed die attach pad. Internally connected to GND. External connection to GND is optional.
PIN CONNECTIONS
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
BOOST
V
IN
V
IN
V
IN
Vsw
V
SW
V
SW
SHDNB
NC
NC
V
C
V
FB
NC
NC
GND
NC
NC
SYNC
18−Lead DFN
1
8
SYNCSHDNB
GNDV
SW
V
FB
V
IN
V
C
BOOST
SO−8
P1-P3P4-P6P7-P9P10-P12P13-P15

NCP1546DG

Mfr. #:
Buy NCP1546DG
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators 1.5A LOW VOLTAGE REG
Lifecycle:
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