NCV8852
Automotive Grade
Non-Synchronous Buck
Controller
The NCV8852 is an adjustable−output non−synchronous buck
controller which drives an external P−channel MOSFET. The device
uses peak current mode control with internal slope compensation. The
IC incorporates an internal regulator that supplies charge to the gate
driver.
Protection features include internal soft−start, undervoltage lockout,
cycle−by−cycle current limit, hiccup−mode overcurrent protection,
hiccup−mode short−circuit protection.
Additional features include: programmable switching frequency,
low quiescent current sleep mode and externally synchronizable
switching frequency.
Features
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MARKING
DIAGRAM
8
8
1
V8852
A
L
Y
W
G
SOIC−8
SUFFIX D
CASE 751
V8852
ALYW
G
1
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Ultra Low Iq Sleep Mode
Adjustable Output with 800 mV
±2.0%
Reference Voltage
Wide Input of 3.1 to 44 V with Undervoltage Lockout (UVLO)
Programmable Switching Frequency
Internal Soft−Start (SS)
Fixed−Frequency Peak Current Mode Control
Internal Slope Compensating Artificial Ramp
Internal High−Side PMOS Gate Driver
Regulated Gate Driver Current Source
External Frequency Synchronization (SYNC)
Programmable Cycle−by−Cycle Current Limit (CL)
Hiccup Overcurrent Protection (OCP)
Output Short Circuit Hiccup Protection (SCP)
Space−Saving 8−PIN SOIC Package
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
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PINOUT DIAGRAM
1 ROSC
2 EN/SYNC
3 COMP
4 FB
VIN 8
ISNS 7
GDRV 6
GND 5
ORDERING INFORMATION
Device
NCV8852DR2G
Package
SOIC−8
(Pb−Free)
Shipping
†
2500/Tape & Reel
†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, 2012
October, 2012
−
Rev. 5
1
Publication Order Number:
NCV8852/D
NCV8852
VIN
ROSC
EN/SYNC
EN/SYNC
COMP
FB
VIN
ISNS
GDRV
GND
VO
Figure 1. NCV8852 Application Diagram
8
UVLO
OCP
EN/SYNC
ROSC
2
1
OSC
SCP
FAULT
LOGIC
+
PWM
CLAMP
4
SS
COMP 3
VEA
VREF
5
GND
FB
CL
CSA
7
VIN
ISNS
DRIVE
LOGIC
6
GDRV
Figure 2. NCV8852 Simple Block Diagram
PIN DESCRIPTIONS
No
1
2
3
4
5
6
7
8
Pin Symbol
ROSC
EN/SYNC
COMP
FB
GND
GDRV
ISNS
VIN
Use a resistor from ground to set the frequency.
Enable and synchronization input. The falling edge synchronizes the internal oscillator. The part is disabled
into sleep mode when this pin is brought low for longer than the enable time−out period.
Output of the voltage error amplifier. An external compensator network from COMP to GND is used to sta-
bilize the converter and tailor transient performance.
Output voltage feedback. A resistor from the output voltage to FB with another resistor from FB to GND
creates a voltage divider for regulation and programming of the output voltage.
Ground reference.
Gate driver output. Connect to gate of the external P−channel MOSFET. A series resistance can be added
from GDRV to the gate to tailor EMC performance.
Current sense input. Connect this pin to the source of the external P−channel MOSFET, through a current−
sense resistor to VIN to sense the switching current for regulation and current limiting.
Main power input for the IC.
Function
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2
NCV8852
MAXIMUM RATINGS
(Voltages are with respect to GND unless otherwise indicated.)
Rating
DC Voltage (VIN, ISNS, GDRV)
Peak Transient Voltage (Load Dump on VIN)
DC Voltage (EN/SYNC)
DC Voltage (COMP, FB, ROSC)
DC Voltage Stress (VIN
−
GDRV)
Operating Junction Temperature Range
Storage Temperature Range
Peak Reflow Soldering Temperature: Pb−Free 60 to 150 seconds at 217°C
Value
−0.3
to 44
44
−0.3
to 6.0
−0.3
to 3.6
−0.7
to 12
−40
to 150
−65
to 150
265
Unit
V
V
V
V
V
°C
°C
°C
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.
PACKAGE ATTRIBUTES
Characteristic
ESD Capability
Human Body Model
Machine Model
Charge Device Model
Moisture Sensitivity Level
Package Thermal Resistance
Junction–to–Ambient, R
qJA
Value
2.0 kV
200 V
>1.0 kV
MSL 1 260°C
100°C/W
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3
NCV8852
ELECTRICAL CHARACTERISTICS
(−40°C < T
J
< 150°C, 3.4 V < V
IN
< 36 V, EN = 5 V, no sync, unless otherwise specified)
Characteristic
GENERAL
Quiescent Current
I
q,sleep
I
q,off
I
q,on
Undervoltage Lockout
Undervoltage Lockout
Hysteresis
Overvoltage Lockout
OSCILLATOR
Switching Frequency
R
OSC
Voltage
Default Switching
f
SW
V
ROSC
f
SW
R
OSC
= Open
R
OSC
= 100 kW
R
OSC
= 20 kW
R
OSC
= 10 kW
153
180
283
409
100
1.0
170
200
315
455
25.5
90
110
93
100
1.0
200
1.5
300
2.0
400
140
187
220
347
501
500
kHz
V
kHz
V
uvlo
V
uvlo,hys
V
ovlo
V
IN
= 13.2 V, EN = 0 V, Sleep Mode
V
IN
= 13.2 V, EN = 5 V or toggled, V
FB
= 1 V,
No Switching
V
IN
= 13.2 V, EN = 5 V or toggled, V
FB
= 0 V,
Switching
V
IN
decreasing
2.9
50
36.9
2.5
2.0
3.0
3.1
150
38
6.0
3.0
5.0
3.3
300
39.3
mA
mA
mA
V
mV
V
Symbol
Conditions
Min
Typ
Max
Unit
Slope Compensation
Minimum On Time
Minimum Off Time
Max Duty Cycle
Soft−Start Time
Soft−Start Delay
EN/SYNC
Low Threshold
High Threshold
Input Current
SYNC Frequency Range
SYNC Delay
SYNC Duty Cycle
Disable Delay Time
VOLTAGE ERROR AMP
DC Gain
Gain−Bandwidth Product
FB Bias Current
Charge Currents
Reference Voltage
High Saturation Voltage
Low Saturation Voltage
CURRENT SENSE AMP
Common−Mode Range
Differential Mode Range
Amplifier Gain
Input Bias Current
m
a
t
onmin
t
offmin
D
max
t
ss
t
ss,dlly
V
s,il
V
s,ih
I
sync
f
sync
t
s,dly
D
sync
t
en
A
v
G
BW
I
vfb,bias
I
src,vea
I
snk,vea
V
ref
V
c,max
V
c,min
CMR
DMR
A
csa
I
sns,bias
3.1
300
Source, V
FB
= 0.9 V, V
COMP
= 1.2 V
Sink, V
FB
= 0.7 V, V
COMP
= 1.2 V
1.2
0.5
784
2.2
% of f
SW
55
1.7
Relative to Nominal Switching Frequency
From SYNC falling edge to GDRV falling edge
25
80
2.0
mV/ms
ns
%
%
ms
ms
V
V
0.8
5.0
50
300
10
600
100
75
mA
%
ns
%
%
80
2.4
0.1
1.8
0.8
800
2.3
0.001
91
3.1
1.0
2.5
1.0
816
0.3
dB
MHz
mA
mA
mV
V
V
40
2.0
30
50
V
mV
V/V
mA
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4
NCV8852
ELECTRICAL CHARACTERISTICS
(−40°C < T
J
< 150°C, 3.4 V < V
IN
< 36 V, EN = 5 V, no sync, unless otherwise specified)
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
CURRENT LIMIT / OVER CURRENT PROTECTION
Cycle−by−Cycle Current Limit
Threshold
Cycle−by−Cycle Current Limit
Response Time
Over Current Protection
Threshold
Over Current Protection
Response Time
GATE DRIVERS
Leading Edge Blanking Time
Gate Driver Pull Up Current
Gate Driver Pull Down
Current
Gate Driver Clamp Voltage
(V
IN
– V
GDRV
)
Power Switch Gate to Source
Voltage
SHORT CIRCUIT PROTECTION
Startup Blanking Time
Short−Circuit Threshold
Voltage
Hiccup Time
SC Response Time
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown
Hysteresis
Thermal Shutdown Delay
T
sd
T
sd,hys
t
tsd
T
J
rising
T
J
Shutdown – T
J
Startup
T
J
> Thermal Shutdown Threshold to stop
switching
160
10
170
15
180
20
200
°C
°C
ns
t
scp,dly
V
scp
t
hcp,dly
t
scp
From start of soft−start, % of soft−start time
% of Feedback Voltage (V
ref
)
% of Soft−Start Time
Switcher Running
105
65
70
135
60
200
300
75
%
%
%
ns
t
on,min
I
sink
I
src
V
drv
V
gs
V
IN
= 4 V
V
IN
−
V
GDRV
= 4 V
V
IN
−
V
GDRV
= 4 V
6.0
3.8
200
200
8.0
100
300
300
10
ns
mA
mA
V
V
V
cl
t
cl
V
ocp
t
ocp
% of V
cl
125
150
85
100
115
200
175
200
mV
nsec
%
ns
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5
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