NCV896530
2.1 MHz Low Voltage Dual
Output Buck Converter
The NCV896530 dual step−down dc−dc converter is a monolithic
integrated circuit dedicated to automotive driver information systems
from a downstream voltage rail.
Both channels are externally adjustable from 0.9 V to 3.3 V and can
source totally up to 1600 mA. Converters are running at 2.1 MHz
switching frequency above the sensitive AM band and operate 180°
out of phase to reduce large amounts of current demand on the rail.
Synchronous rectification offers improved system efficiency.
The NCV896530 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 NCV896530 is available in a space saving, 3 x 3 mm 10−pin
DFN package.
Features
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MARKING DIAGRAM
NCV89
6530
ALYWG
G
DFN10
CASE 485C
A
L
Y
W
G
•
•
•
•
•
•
•
•
•
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Device
Synchronous Rectification for Higher Efficiency
2.1 MHz Switching Frequency, 180° Out−of−Phase
Sources up to 1600 mA Total and 1 A Per Channel
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
•
This is a Pb−Free Device
Typical Applications
(Note: Microdot may be in either location)
PIN CONNECTIONS
FB1
EN1
SYNC
VIN
SW1
1
2
3
4
5
(Top View)
10
9
8
7
6
FB2
EN2
POR
GND
SW2
•
•
•
•
Audio
Infotainment
Vision System
Instrumentation
2.2
mH
VOUT1
10
mF
POR
2.2
mH
VOUT2
10
mF
ORDERING INFORMATION
Device
NCV896530MWTXG
Package
DFN10
(Pb−Free)
Shipping
†
3000 / Tape &
Reel
4 VIN
11
7 GND
2 EN1
3 SYNC
9 EN2
SW1 5
FB1 1
†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.
OFF ON
2.1MHz
POR 8
SW2 6
OFF ON
Figure 1. NCV896530 Typical Application
©
Semiconductor Components Industries, LLC, 2015
April, 2015 − Rev. 3
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FB2 10
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1
Publication Order Number:
NCV896530/D
NCV896530
BLOCK DIAGRAM
EA1
EA2
FB1
1
VREF
UVLO
VREF
10
FB 2
Thermal
shutdown
VIN
EN 1
2
LOGIC
CONTROL
SYNC
9
Voltage
reference
LOGIC
CONTROL
8
EA1
AVIN
EN2
SYNC
3
POR
Oscillator
EA2
VIN
Ramp generator
AVIN
0°
180°
Q3
PVIN
VIN
4
PVIN Q1
7
GND
PWM
Q2
PWM
CONTROL
Q4
CONTROL
SW 1
5
ILIMIT
SYNC
6
ILIMIT
SW 2
Figure 2. Simplified Block Diagram
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2
NCV896530
PIN FUNCTION DESCRIPTION
Pin
1
2
Pin Name
FB1
EN1
Type
Analog Input
Digital Input
Description
Feedback voltage from the output 1. This is the input to the error amplifier.
Enable for converter 1. 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 to 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 1 to the Inductor.
Connection from power MOSFETs of output 2 to the Inductor.
This pin is the GROUND reference for the analog section of the IC. The pin must be
connected to the system ground.
Power On Reset. This is an open drain output. This output is shutting down when one
of the output voltages are less than 90% (typ) of their nominal values. A pull−up resist-
or around 500 kW should be connected between POR and VIN, VOUT1 or VOUT2
depending on the supplied device.
Enable for converter 2. This pin is active HIGH (equal or lower Analog Input voltage)
and is turned off by logic LOW.
Do not let this pin float.
Feedback voltage from the output 2. This is the input to the error amplifier.
This pin is the GROUND reference for the NFET power stage of the IC. The pin must
be connected to the system ground and to both input and output capacitors.
3
SYNC
Digital Input
4
5
6
7
8
VIN
SW1
SW2
GND
POR
Analog / Power
Input
Analog Output
Analog Output
Analog Ground
Digital Output
9
EN2
Digital Input
10
11
FB2
Exposed Pad
Analog Input
Power Ground
MAXIMUM RATINGS
Rating
Minimum Voltage All Pins
Maximum Voltage All Pins
Maximum Voltage ENx, SYNC, FBx, , SWx, POR
Thermal Resistance Junction−to−Ambient (3x3 DFN) (Note 1)
Storage Temperature Range
Junction Operating Temperature
ESD Withstand Voltage
Human Body Model
Machine Model
Moisture Sensitivity Level
Symbol
V
min
V
max
V
max
R
qJA
T
stg
T
J
V
esd
2.0
200
MSL
3
kV
V
per IPC
Value
−0.3
6.0
VIN+0.3
40
−55 to 150
−40 to 150
Unit
V
V
V
°C/W
°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.
1. Mounted on 1 sq. in. of a 4−layer PCB with 1 oz. copper thickness.
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NCV896530
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
Standby Current
Under Voltage Lockout
Under Voltage Hysteresis
SYNC
SYNC Threshold Voltage
Logic high
Logic Low
SYNC Pin Bias Current
External Synchronization
SYNC Pulse Duty Ratio
EN1, EN2
ENx Threshold Voltage
Logic high
Logic Low
ENx Pin Bias Current
POWER ON RESET
Power On Reset Threshold
Power On Reset Hysteresis
Sink Current
OUTPUT PERFORMANCES
Feedback Voltage Threshold
Feedback Voltage Accuracy
FB1, FB2
T
A
= 25C
−40°C < T
A
< 125°C
Soft−Start Time
Switching Frequency
Duty Cycle
POWER SWITCHES
High−Side MOSFET On−resistance
Low−Side MOSFET On−resistance
High−Side MOSFET Leakage Current
Low−Side MOSFET Leakage Current
Minimum On Time
PROTECTION
Current Limit
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Hiccup Time
% of Soft−Start Time
Peak inductor current
I
PK
T
SD
T
SDH
t
hcp,dly
1.4
150
5
60
170
2.0
190
20
A
°C
°C
%
I
RDS(on)
= 600 mA, V
IN
= 5 V, T
A
= 25°C
I
RDS(on)
= 600 mA, V
IN
= 5 V, T
A
= 25°C
V
IN
= 5 V, V
LX
= 0 V, V
ENx
= 0 V
V
LX
= 5 V, V
ENx
= 0 V
R
ONHS
R
ONLS
I
LEAKHS
I
LEAKLS
T
ONMIN
−
−
−
−
−
500
450
820
820
5
5
80
mW
mW
mA
mA
ns
Time from EN to 90% of output voltage
EN1 = EN2 = 1, V
IN
= 5 V
V
FB
ΔV
OUT
ΔV
OUT
t
START
F
SW
D
−2
400
1.8
−
−
0.6
±1
−
−
2.1
−
−
−
+2
1000
2.6
100
ms
MHz
%
V
%
V
POR
= 0.4 V
V
OUT
falling
V
PORT
V
PORH
I
SIPOR
87%
−
2
93%
3%
V
V
mA
V
ENx
= 5 V
V
IHENx
V
ILENx
I
ILENx
2
1.2
−
−
0.4
50
mA
V
V
SYNC
= 5 V
V
IHSYNC
V
ILSYNC
I
ILSYNC
F
SYNC
T
SYNC
2
1.8
50
1.2
−
−
0.4
50
2.7
mA
MHz
%
V
SYNC = GND, V
FB
= 0 V
EN1 = EN2 = 2 V, No Switching
EN1 = EN2 = 0 V
V
IN
falling
I
Q
I
STBMAX
V
UVLO
V
UVLOH
−
−
2.2
−
2.0
4.0
2.4
100
3.0
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
NCV896530
TYPICAL CHARACTERISTICS CURVES
2.4
F
SW
, SWITCHING FREQUENCY (MHz)
I
SYNC
, SYNC PULLDOWN CURRENT
(mA)
T
J
= 25°C,
EN1 = EN2 = 1
2.35
12
T
J
= 25°C
10
8
6
4
2
0
2.3
2.25
2.2
2.5
3
3.5
4
4.5
5
5.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
V
IN
, INPUT VOLTAGE (V)
V
SYNC
, SYNC VOLTAGE (V)
Figure 3. Switching Frequency vs. Input
Voltage
I
ENX
, ENABLE PULLDOWN CURRENT (mA)
12
I
STBMAX
, STANDBY CURRENT (mA)
T
J
= 25°C
10
8
6
4
2
0
0
1
2
3
4
5
6
V
ENX
, ENABLE VOLTAGE (V)
14
Figure 4. Sync Pulldown Current vs. Sync
Voltage
T
J
= 25°C
12
10
8
6
4
2
0
2.5
3
3.5
4
4.5
5
5.5
V
IN
, INPUT VOLTAGE (V)
Figure 5. Enable Pulldown Current vs. Enable
Voltage
2.00
1.95
I
PK
, CURRENT LIMIT (A)
1.90
1.85
1.80
1.75
1.70
1.65
1.60
−40
V
REF
, REFERENCE VOLTAGE (mV)
600.0
599.5
599.0
598.5
598.0
597.5
597.0
596.5
596.0
−40
Figure 6. Standby Current vs. Input Voltage
10
60
110
10
60
110
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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PCB设计
