NCV8509 Series
http://onsemi.com
16
V
OUT1
V
OUT2
Short On
V
OUT1
Short On
V
OUT2
10 μs
10 μs
Fast SLEW Rate >> Soft Start
Figure 52. Fault Response. Note the High SLEW Rate Coming Out of Fault Conditions.
Soft Start Only Applies to a Power Up Sequence.
Fast SLEW Rate >> Soft Start
Decay Time Dependent
on External Load
Decay Time Dependent
on External Load
Disable Time
Disable Time
Slew Rate Control
Figure 53 shows the circuitry associated with Slew Rate
Control. The diagram highlights the control of one output for
simplicity. V
OUT1
and V
OUT2
are both controlled on the IC.
The slew rate capacitor (C
SLEW
) is charged with an
onchip current source runing at 6.0 mA (typ.). Charging a
capacitor with a current source creates a linear voltage ramp
as shown in Figure 54.
The lowest voltage to the positive terminals of the
comparator (Error Amp) dominates the output voltage
(V
OUT
). Consequently, when C
SLEW
is fully discharged on
power up, it is the dominant factor on the positive terminal
and disables the output. The output (V
OUT
) follows the
linear ramp on the SLEW pin (after being gained up with R1
and R2) until V
BG
becomes the dominant voltage. This
occurs when SLEW = V
BG
+ V
D1
or approximately 1.8 V.
R1
+
+
V
OUT
R2
Error Amp
SLEW
C
SLEW
6.0 μA
Internal
Voltage
Rail 3.8 V
D2
V
IN1
D1
V
BG
Figure 53. Slew Control Circuitry
Slew time can be calculated using the standard capacitor
equation.
I + C
dv
dt
,t+
C(DV)
I
Using a 33 nF capacitor, the slew time is:
t +
(33 nF)(1.8 V)
6 mA
+ 9.9 ms
The corresponding slew rate for this is 1.8 V/9.9 ms =
182 V/s ON THE SLEW PIN.
To calculate the slew rate on outputs, you must multiply
by the gain set up by R1 and R2.
A
v
+
V
OUT
1.28 V
For a 5 V output, the gain would be:
A
v
+
5V
1.28 V
+ 3.9 VńV
assuming V
BG
= 1.28 V.
The resultant slew rate on the output is the slew rate on the
SLEW pin multiplied by the gain, or:
(182 Vńs) (3.9 VńV) + 710 Vńs
Outputs in Regulation
Figure 54.
Time (ms)
SLEW Pin Voltage (V)
3.8
1.8
t
SLEW
NCV8509 Series
http://onsemi.com
17
ORDERING INFORMATION
Device Output Voltage Package Shipping
NCV8509PDW18G
3.3 V/1.8 V
SOIC 16 Lead
(PbFree)
47 Units/Rail
NCV8509PDW18R2G SOIC 16 Lead
(PbFree)
1000 Tape & Reel
NCV8509PDW25G
5 V/2.5 V
SOIC 16 Lead
(PbFree)
47 Units/Rail
NCV8509PDW25R2G SOIC 16 Lead
(PbFree)
1000 Tape & Reel
NCV8509PDW26G
5 V/2.6 V
SOIC 16 Lead
(PbFree)
47 Units/Rail
NCV8509PDW26R2G
SOIC 16 Lead
(PbFree)
1000 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.
NCV8509 Series
http://onsemi.com
18
PACKAGE DIMENSIONS
SOIC 16 LEAD WIDE BODY
EXPOSED PAD
PDW SUFFIX
CASE 751AG01
ISSUE A
G
W
U
P
M
0.25 (0.010) W
T
SEATING
PLANE
K
D 16 PL
C
M
0.25 (0.010) T UW
S S
M
F
DETAIL E
DETAIL E
R x 45
_
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE PROTRUSION SHALL BE
0.13 (0.005) TOTAL IN EXCESS OF THE D DIMENSION
AT MAXIMUM MATERIAL CONDITION.
6. 751R-01 OBSOLETE, NEW STANDARD 751R-02.
J
M
14 PL
PIN 1 I.D.
8
1
16 9
TOP SIDE
0.10 (0.004) T
16
EXPOSED PAD
18
BACK SIDE
L
H
DIM
A
MIN MAX MIN MAX
INCHES
10.15 10.45 0.400 0.411
MILLIMETERS
B 7.40 7.60 0.292 0.299
C 2.35 2.65 0.093 0.104
D 0.35 0.49 0.014 0.019
F 0.50 0.90 0.020 0.035
G 1.27 BSC 0.050 BSC
H 3.45 3.66 0.136 0.144
J 0.25 0.32 0.010 0.012
K 0.00 0.10 0.000 0.004
L 4.72 4.93 0.186 0.194
M 0 7 0 7
P 10.05 10.55 0.395 0.415
R 0.25 0.75 0.010 0.029
____
A
B
9
*For additional information on our PbFree strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
0.350
0.175
0.050
0.376
0.188
0.200
0.074
DIMENSIONS: INCHES
0.024
0.150
Exposed
Pad
C
L
C
L
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
N. American Technical Support: 8002829855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81357733850
NCV8509/D
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 3036752175 or 8003443860 Toll Free USA/Canada
Fax: 3036752176 or 8003443867 Toll Free USA/Canada
Email: orderlit@onsemi.com
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative

NCV8509PDW18R2

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
IC REG LINEAR 3.3V/1.8V 16SOIC
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union