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CS51033YDR8

P1-P3P4-P6P7-P9P10-P10
© Semiconductor Components Industries, LLC, 2005
October, 2005 − Rev. 10
1 Publication Order Number:
CS51033/D
CS51033
Fast P−Ch FET Buck
Controller
The CS51033 is a switching controller for use in DC−DC
converters. It can be used in the buck topology with a minimum
number of external components. The CS51033 consists of a 1.0 A
power driver for controlling the gate of a discrete P−Channel
transistor, fixed frequency oscillator, short circuit protection timer,
programmable Soft−Start, precision reference, fast output voltage
monitoring comparator, and output stage driver logic with latch.
The high frequency oscillator allows the use of small inductors and
output capacitors, minimizing PC board area and systems cost. The
programmable Soft−Start reduces current surges at start up. The short
circuit protection timer significantly reduces the P−Ch FET duty cycle
to approximately 1/30 of its normal cycle during short circuit
conditions.
Features
• 1.0 A Totem Pole Output Driver
• High Speed Oscillator (700 kHz max)
• No Stability Compensation Required
• Lossless Short Circuit Protection
• 2.0% Precision Reference
• Programmable Soft−Start
• Wide Ambient Temperature Range:
♦ Industrial Grade: −40°C to 85°C
♦ Commercial Grade: 0°C to 70°C
• Pb−Free Packages are Available
PIN CONNECTIONS
51033 = Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
x = Continuation of Device Code
x = Y or G
G = Pb−Free Package
SOIC−8
D SUFFIX
CASE 751
1
8
MARKING DIAGRAM
V
FB
GND
V
CC
C
OSC
CSPGND
V
C
V
GATE
1
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
ORDERING INFORMATION
51033
ALYWx
G
1
8
CS51033
http://onsemi.com
2
Figure 1. Typical Application Diagram
V
GATE
PGND
C
OSC
GND
V
C
CS
V
CC
V
FB
CS51033
100 mF
0.1 mF
R
B
300
C
2
1.0 mF
GND
100
R
C
10 W
R
G
0.1 mF
CS
4.7 mH
IRF7404
D
4
10 W
C
IN
100 mF
1.5V
OUT
@ 3.0 Am
p
D
1
D
2
C
1
0.1 mF
D
3
1N5818
1N4148
1N4148
C
3
100 mF
C
OSC
150 pF
R
A
1.5 k
0.1 mF
GND
3.3V
IN
1N5821
C
0
100 mF
C
4
0.1 mF
U1
Note: Capacitors C
2
, C
3
, and C
4
, are low
ESR tantalum caps used for noise reduction.
MAXIMUM RATINGS
Rating Value Unit
Power Supply Voltage, V
CC
5.0 V
Driver Supply Voltage, V
C
20 V
Driver Output Voltage, V
GATE
20 V
C
OSC
, CS, V
FB
(Logic Pins) 5.0 V
Peak Output Current 1.0 A
Steady State Output Current 200 mA
Operating Junction Temperature, T
J
150 °C
Storage Temperature Range, T
S
−65 to 150 °C
ESD (Human Body Model) 2.0 kV
Package Thermal Resistance, Junction−to−Case, R
q
JC
Junction−to−Ambient, R
q
JA
45
165
°C/W
°C/W
Lead Temperature Soldering: Reflow (SMD styles only) (Note 1) 230 peak °C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. 60 sec. max above 183°C.
CS51033
http://onsemi.com
3
ELECTRICAL CHARACTERISTICS (Specifications apply for 3.135 ≤ V
CC
≤ 3.465, 3.0 V ≤ V
C
≤ 16 V;
Industrial Grade: −40°C < T
A
< 85°C; −40°C < T
J
< 125°C: Commercial Grade: 0°C < T
A
< 70°C; 0°C < T
J
< 125°C, unless otherwise specified.)
Characteristic Test Conditions Min Typ Max Unit
Oscillator V
FB
= 1.2 V
Frequency C
OSC
= 470 pF 160 200 240 kHz
Charge Current 1.4 V < V
COSC
< 2.0 V − 110 −
mA
Discharge Current 2.7 V > V
COSC
> 2.0 V − 660 −
mA
Maximum Duty Cycle 1 − (t
OFF
/t
ON
) 80.0 83.3 − %
Short Circuit Timer
V
FB
= 1.0 V; CS = 0.1 mF; V
COSC
= 2.0 V
Charge Current 1.0 V < V
CS
< 2.0 V 175 264 325
mA
Fast Discharge Current 2.55 V > V
CS
> 2.4 V 40 66 80
mA
Slow Discharge Current 2.4 V > V
CS
> 1.5 V 4.0 6.0 10
mA
Start Fault Inhibit Time − 0.70 0.85 1.40 ms
Valid Fault Time 2.6 V > V
CS
> 2.4 V 0.2 0.3 0.45 ms
GATE Inhibit Time 2.4 V > V
CS
> 1.5 V 9.0 15 23 ms
Duty Cycle − 2.5 3.1 4.6 %
CS Comparator V
FB
= 1.0 V
Fault Enable CS Voltage − − 2.5 − V
Max CS Voltage V
FB
= 1.5 V − 2.6 − V
Fault Detect Voltage V
CS
when GATE goes high − 2.4 − V
Fault Inhibit Voltage Minimum V
CS
− 1.5 − V
Hold Off Release Voltage V
FB
= 0 V 0.4 0.7 1.0 V
Regulator Threshold Voltage Clamp V
CS
= 1.5 V 0.725 0.866 1.035 V
V
FB
Comparators V
COSC
= V
CS
= 2.0 V
Regulator Threshold Voltage T
J
= 25°C (Note 2)
T
J
= −40 to 125°C
1.225
1.210
1.250
1.250
1.275
1.290
V
V
Fault Threshold Voltage T
J
= 25°C (Note 2)
T
J
= −40 to 125°C
1.12
1.10
1.15
1.15
1.17
1.19
V
V
Threshold Line Regulation 3.135 V ≤ V
CC
≤ 3.465 − 6.0 15 mV
Input Bias Current V
FB
= 0 V − 1.0 4.0
mA
Voltage Tracking (Regulator Threshold − Fault Threshold Voltage) 70 100 120 mV
Input Hysteresis Voltage − − 4.0 20 mV
Power Stage V
C
= 10 V; V
FB
= 1.2 V
GATE DC Low Saturation Voltage V
COSC
= 1.0 V; 200 mA Sink − 1.2 1.5 V
GATE DC High Saturation Voltage V
COSC
= 2.7 V; 200 mA Source; V
C
= V
GATE
− 1.5 2.1 V
Rise Time C
GATE
= 1.0 nF; 1.5 V < V
GATE
< 9.0 V − 25 60 ns
Fall Time C
GATE
= 1.0 nF; 9.0 V > V
GATE
> 1.5 V − 25 60 ns
Current Drain
I
CC
3.135 V < V
CC
< 3.465 V, Gate switching − 3.5 6.0 mA
I
C
3.0 V < V
C
< 16 V, Gate non−switching − 2.7 4.0 mA
2. Guaranteed by design, not 100% tested in production.
P1-P3P4-P6P7-P9P10-P10

CS51033YDR8

Mfr. #:
Buy CS51033YDR8
Manufacturer:
ON Semiconductor
Description:
Switching Controllers Fast PFET Buck
Lifecycle:
New from this manufacturer.
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