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OCP2030
SWITCHING BUCK REGULATOR
„ General Description
The OCP2030 is a buck topology of switching regulator for wide operating voltage applications field. The OCP2030
includes a high current P-MOSFET, high precision reference (0.5V) for comparing output voltage with feedback
amplifier, an internal dead-time control and oscillator for controlling the maximum duty cycle and PWM frequency, and
has power-on programmable soft start time and short circuit PMOS turn-off and auto re-start protection functions.
„ Features
z Precision feedback reference voltage: 0.5V (2%)
z Wide supply voltage operating range: 3.0 to 20V
z Low current consumption: 5.5mA
z Internal fixed oscillator frequency: Typ. 500KHz
z Programmable Soft-Start function (SS)
z Short Circuit Shutdown and Auto Re-start function(ARSCP)
z Built-in P-MOSFET for 3A loading capability
z Package: SOP8
„ Typical Application Circuit
Vin
+
1 VCC
LX 8
LX 7
OCP2030
IN- 3
2
SCP
FB
GND GND
4
56
Vout
+
„ Pin Configuration
Top View
18
27
3 OCP2030 6
45
Name
VCC
SS/SCP
IN-
FB
GND
LX
No. Status
1P
2I
3I
4O
5
6
P
7
8
O
Description
IC Power Supply (PMOS Source)
Connecting with a Soft-start &
ARSCP timing capacitor
Error Amplifier Inverting Input
Error Amplifier Compensation
Output
IC Ground
PMOS High Current Output
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Rev. 1.0 Jan 09, 2007

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„ Block Diagram
1
Reference
Regulator
1.25V
Oscillator
3
0.5V
4
36K
500
0.7V
Soft start&Auto Re-start
S.C.P Circuits
OCP2030
SWITCHING BUCK REGULATOR
Thermal
Shuntdown
Output drive
control circuits
56
2
78
„ Absolute Maximum Ratings
Power supply voltage
Output source current
Error amplifier inverting input
Allowable dissipation
SOP8 Ta+25
Operating temperature
Storage temperature
SOP8 Lead Temperature (soldering, 10 sec)
+20V
+3A
-0.3V~+1.2V
650mW
-10+85
-55+125
+260
„ DC Electrical Characteristics
Electrical characteristics over recommended operating free-air temperature range, VCC=6V, (unless otherwise noted)
Reference
Parameter
Output voltage
Input regulation
Output voltage change with temperature
Symbol
VREF
VREF
VREF/VREF
Test Conditions
COMP connected to FB
Vcc=3.0V to 20V
TA=-10to 25
TA=25to 85
Min.
0.490
Typ.
0.5
2
1
1
Max.
0.510
12.5
2
2
Unit
V
mV
%
Soft Start (S.S.)
Parameter
S.S. Source current
Soft start threshold voltage
Symbol
ISS
VSST
Test Conditions
VSS= 0V
-
Min.
-15
0.8
Typ.
-10
0.9
Max.
-7
1.0
Unit
µA
V
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OCP2030
SWITCHING BUCK REGULATOR
„ DC Electrical Characteristics (Continuous)
Short-circuit protection (S.C.P.)
Parameter
S.C.P source current
SCP re-start/hold time
S.C.P threshold voltage
Symbol
ISCP
TRS/THOLD
VSCP
VSB
Test Conditions
VSCP=0V
VCOMP>0.8V
VFB>450mV
VFB<450mV
Min.
-15
0.9
Typ.
-10
1/20
1.0
0.1
Max.
-7
1.1
0.15
Unit
µA
-
V
Oscillator
Parameter
Frequency
Frequency change with voltage
Frequency change with temperature
Symbol
f
f/V
f/T
Test Conditions
Vcc=3.0 V to 20V
TA=--10to 85
Min.
400
-
-
Typ.
500
5
5
Max.
600
-
Unit
KHz
%
%
Error amplifier
Parameter
Input threshold voltage
VTchange with voltage
VTchange with temperature
Input bias current
Voltage Gain
Frequency bandwidth
Output voltage
Positive
Swing
Negative
Output source current
Output sink current
Symbol
VIN-
VIN-/ V
VIN-/ T
IB
Av
BW
VPOS
VNEG
ISOURCE
ISINK
Test Conditions
VFB=450mV
VCC=3V to 20V
Ta = -10to 85
--
--
Av=0 dB
VIN-=0.3V
VIN-=0.7V
VFB=450mV
Min.
490
-
-
-1.0
-
-
0.78
-
-
30
Typ.
500
5
1
-0.2
100
6
0.87
0.05
-45
45
Max.
510
20
-
1.0
-
-
-
0.2
-30
-
Unit
mV
mV
%
µA
V/V
MHz
V
µA
µA
Idle Period Adjustment
Parameter
Maximum duty cycle
Symbol
TDUTY
Test Conditions
VIN- =0.2V
Min. Typ, Max. Unit
- 80 - %
Output
Parameter
PMOS D-S voltage
PMOS source current
PMOS On resistance
Output leakage current
Total device
Parameter
Standby supply current
Symbol
VDSS
ID
RDS(ON)
IL
Test Conditions
VFB=0.1V
VCC=5.0V, VIN-=0V
VCC=10V, VIN-=0V
SCP active
Min.
Typ,
-25
-2
70
42
5
Max.
-
90
65
-
Unit
V
A
m
µA
Symbol
ISTANDBY
Test Conditions
Min.
-
Typ.
4.5
Max.
6
Unit
mA
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Page3 - 8
Rev. 1.0 Jan 09, 2007