NCV894530
1.2 A - 2.1 MHz High
Efficiency Low Voltage
Step-Down Converter
The NCV894530 step−down dc−dc converter is a monolithic
integrated circuit dedicated to automotive driver information systems
from a downstream voltage rail. The output voltage is externally
adjustable from 0.9 V to 3.3 V and can source up to 1.2 A. The
converter is running at a 2.1 MHz switching frequency, above the
sensitive AM band. The NCV894530 provides additional features
expected in automotive power systems such as integrated soft−start,
hiccup mode current limit and thermal shutdown protection. The
device can also be synchronized to an external clock signal in the
range of 2.1 MHz. The NCV894530 is available in the same 3x3 mm
10−pin DFN package as the dual NCV896530, with compatible
pin−out.
Features
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MARKING
DIAGRAM
NCV89
4530
ALYW
DFN10
CASE 485C
. .
•
•
•
•
•
•
•
•
•
Synchronous Rectification for Higher Efficiency
2.1 MHz Switching Frequency
Sources up to 1.2 A
Adjustable Output Voltage from 0.9 V to 3.3 V
2.7 V to 5.5 V Input Voltage Range
Thermal Limit and Short Circuit Protection
Auto Synchronizes with an External Clock
Wettable Flanks − DFN
NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
•
These Devices are Pb−Free and are RoHS Compliant
Typical Applications
NCV89
4530
= Specific Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
FB
EN
SYNC
VIN
SW
1
2
3
4
5
(Top View)
10
9
8
7
6
GND
NC
POR
GND
NC
•
•
•
•
Audio
Infotainment
Safety − Vision System
Instrumentation
ORDERING INFORMATION
Device
NCV894530MWTXG
Package
Shipping
†
DFN10 3000/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
©
Semiconductor Components Industries, LLC, 2015
1
September, 2015 − Rev. 2
Publication Order Number:
NCV894530/D
NCV894530
L
2.2
mH
V
in
V
in
C
in
20
mF
SW
V
out
C
out
10
mF
V
DD
NCV894530
SYNC
1.8
−
2.7 MHz
FB
C
1
R
1
V
in
or V
out
R
2
R
POR
Microprocessor
OFF ON
EN
POR
GND
RESET
Figure 1. NCV894530 Typical Application
BLOCK DIAGRAM
V
in
UVLO
CURRENT
LIMIT
SOFTSTART
EN
ENABLE
THERMAL
SHUTDOWN
REFERENCE
LOGIC and
PWM LATCH
POR
SW
EA
FB
SYNC
SLOPE
COMPENSATON
OSCILLATOR
GND
Figure 2. Simplified Block Diagram
PIN FUNCTION DESCRIPTION
Pin
1
2
3
4
5
Pin Name
FB
EN
SYNC
VIN
SW
Type
Analog Input
Digital Input
Digital Input
Analog / Power
Input
Power Output
Description
Feedback voltage. This is the input to the error amplifier.
Enable. This pin is active HIGH (equal or lower Analog Input voltage) and is turned
off by logic LOW. Do not let this pin float.
Oscillator Synchronization. This pin can be synchronized to an external clock in the
range of 2.1 MHz. If not used, the pin must be connected to ground.
Power supply input for the PFET power stage, analog and digital blocks. The pin
must be decoupled to ground by a 10
mF
ceramic capacitor.
Connection from power MOSFETs of output to the Inductor.
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NCV894530
PIN FUNCTION DESCRIPTION
Pin
6
7
8
Pin Name
NC
GND
POR
Type
−
Analog / Power
Ground
Digital Output
This pin is the GROUND reference for the analog section of the IC. The pin must be
connected to the system ground. Both pins must be connected together on PCB.
Power On Reset. This is an open drain output. This output is shutting down when the
output voltage is less than 90% (typ) of their nominal values. An external pull−up
resistor should be connected between POR and V
IN
or V
OUT
depending on the
supplied device.
Description
9
10
EPAD
NC
GND
EPAD
−
Analog Ground
Exposed Pad
Connect this pin to ground.
Connected to GND potential.
ABSOLUTE MAXIMUM RATINGS
(Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area.)
Rating
Input Voltage
SW Voltage
Enable Input Voltage
Feedback Input Voltage
Oscillator Synchronization Input Voltage
Power On Reset Voltage
Junction Temperature
Storage Temperature
Symbol
V
in
V
SW
V
EN
V
FB
V
SYNC
V
POR
T
J
T
STG
Min
−0.3
−0.3
−0.3
−0.3
−0.3
−0.3
−40
−55
Max
6.0
6 V (or V
in
+ 0.3 V)*
6 V (or V
in
+ 0.3 V)*
6 V (or V
in
+ 0.3 V)*
6 V (or V
in
+ 0.3 V)*
6 V (or V
in
+ 0.3 V)*
150
150
Unit
V
V
V
V
V
V
°C
°C
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.
*Whichever is lower.
ESD CAPABILITY
(Note 1)
Rating
ESD Capability, Human Body Model
ESD Capability, Machine Model
Symbol
ESDHBM
ESDMM
Min
−2
−200
Max
2
200
Unit
kV
V
1. This device series incorporates ESD portection and is tested by the following methods:
ESD Human Body Model tested per AEC−Q100−002 (JS−001−2010)
ESD Machine Model tested per AEC−Q100−003 (EIA/JESD22−A115)
LEAD SOLDERING TEMPERATURE AND MSL
(Note 2)
Rating
Moisture Sensitivity Level
Lead Temperature Soldering
Reflow (SMD Styles Only), Pb−Free Versions
Symbol
MSL
T
SLD
Min
3
265 peak
Max
Unit
per IPC
°C
2. For more information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
THERMAL CHARACTERISTICS
Rating
Thermal Characteristics, DFN10 (Note 3)
Thermal Resistance, Junction−to−Air
Symbol
R
qJA
Value
40
Unit
°C/W
3. Values based on copper area of 645 mm
2
(or 1 in
2
) of 1 oz copper thickness and FR4 PCB substrate.
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3
NCV894530
ELECTRICAL CHARACTERISTICS
(2.7 V < V
IN
< 5.5 V, Min and Max values are valid for the temperature range −40°C
≤
T
J
≤
+150°C unless noted otherwise, and are
guaranteed by test, design or statistical correlation. Typical values are referenced to T
A
= +25°C)
Rating
INPUT VOLTAGE
Quiescent Current
Shutdown Current
Under Voltage Lockout
Under Voltage Hysteresis
SYNC
SYNC Threshold Voltage
Logic Low
Logic High
SYNC Input Current
External Synchronization
SYNC Pulse Duty Ratio
ENABLE
Enable Threshold Voltage
Logic Low
Logic High
Enable Input Current
POWER ON RESET
Power On Reset Threshold
Power On Reset Hysteresis
POR Sink Current
FEEDBACK VOLTAGE
Feedback Voltage
(Accuracy %)
Soft−Start Time
SWITCHING FREQUENCY
Switching Frequency
Duty Cycle
Minimum On Time
POWER SWITCHES
High−Side MOSFET On−Resistance
Low−Side MOSFET On−Resistance
High−Side MOSFET Leakage Current
Low−Side MOSFET Leakage Current
CURRENT LIMIT PROTECTION
Current Limit
THERMAL SHUTDOWN
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Guaranteed by Design
Guaranteed by Design
T
SD
T
SH
150
5.0
170
−
190
20
°C
°C
Peak Inductor Current
(100% duty cycle)
I
PK
1.9
−
2.5
A
I
RDS(on)
= 0.6 A, V
IN
= 5 V,
T
J
= 25°C
I
RDS(on)
= 0.6 A, V
IN
= 5 V,
T
J
= 25°C
V
IN
= 5 V, V
SW
= 0 V, V
EN
= 0 V
V
SW
= 5 V, V
EN
= 0 V
R
DS(on)H
R
DS(on)L
I
DS(off)H
I
DS(off)L
−
−
−
−
500
450
−
−
820
820
5.0
5.0
mW
mW
mA
mA
F
SW
D
T
ONmin
1.8
−
−
2.1
−
−
2.4
100
80
MHz
%
ns
T
J
= −40°C to 125°C
Time from EN to 90% of V
FB
V
FB
t
SS
0.591
(−1.5%)
1700
0.6
−
0.609
(+1.5%)
3200
V
ms
V
POR
= 0.4 V
V
OUT
falling
V
PORT
V
PORH
I
POR
87
−
2.0
90
−
−
93
3.0
−
%Vout
%Vout
mA
V
EN
= 5 V
V
V
ILEN
V
IHEN
I
EN
−
1.2
2
−
−
−
0.4
−
50
mA
V
SYNC
= 5 V
V
V
ILSYNC
V
IHSYNC
I
SYNC
f
SYNC
D
SYNC
−
1.2
2.0
1.8
−
−
−
−
−
50
0.4
−
50
2.7
−
mA
MHz
%
SYNC = GND, V
FB
= 0 V, EN = 2 V,
(No Switching)
EN = 0 V
V
IN
falling
I
q
I
OFF
V
UVLO
V
UVLOH
−
−
2.2
−
1.0
−
2.4
100
2.0
10
2.6
150
mA
mA
V
mV
Conditions
Symbol
Min
Typ
Max
Unit
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
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4
NCV894530
TYPICAL CHARACTERISTICS CURVES
2.30
F
SW
, SWITCHING FREQUENCY (MHz)
2.25
2.20
2.15
2.10
2.05
2.00
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V
IN
, INPUT VOLTAGE (V)
T
J
= 25°C
EN1 = 1
I
SYNC
, SYNC PULLDOWN CURRENT (mA)
12
T
J
= 25°C
10
8
6
4
2
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5 5.0
V
SYNC
, SYNC VOLTAGE (V)
Figure 3. Switching Frequency vs. Input
Voltage
I
EN
, ENABLE PULLDOWN CURRENT (mA)
12
T
J
= 25°C
10
8
6
4
2
0
0
1
2
3
4
5
V
EN
, ENABLE VOLTAGE (V)
I
STBMAX
, STANDBY CURRENT (mA)
1.2
Figure 4. Sync Pulldown Current vs. Sync
Voltage
T
J
= 25°C
1.0
0.8
0.6
0.4
0.2
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V
IN
, INPUT VOLTAGE (V)
Figure 5. Enable Pulldown Current vs. Enable
Voltage
2.20
V
REF
, REFERENCE VOLTAGE (mV)
600.0
Figure 6. Standby Current vs. Input Voltage
I
PK
, CURRENT LIMIT (A)
2.15
599.6
599.2
2.10
598.8
2.05
598.4
598.0
−40
2.00
−40
10
60
110
160
10
60
110
160
T
J
, JUNCTION TEMPERATURE (°C)
T
J
, JUNCTION TEMPERATURE (°C)
Figure 7. Current Limit vs. Temperature
Figure 8. Reference Voltage vs. Temperature
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