Document
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 INFB
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
Block Diagram
1
Reference Regulator
1.25V
Oscillator
3 0.5V
4
36KΩ 500Ω
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=-10℃ to 25℃
TA=25℃ to 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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Rev. 1.0 Jan 09, 2007
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=--10℃ to 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 = -10℃to 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
mΩ
µA
Symbol ISTANDBY
Test Conditions
Min. -
Typ. 4.5
Max. 6
Unit mA
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Rev. 1.0 Jan 09, 2007
Typical Characteristics
Reference Output Voltage(V)
0.509 0.508 0.507 0.506
0.505 0.504 0.503 0.502
0.501 3.6
Power Supply Voltage VS.
Reference Output Voltage
6 10 12 15 17 20 Power Supply Voltage (V)
Figure 1
595 590 585 580 575 570 565
560 555 550 545
540 3.6
Power Supply Voltage VS.
Oscillator Frequency
6 10 12 15 17 Power Supply Voltage (V)
20
Figure 3
Oscillator Frequency(KHz)
Reference Output Voltage(V)
Oscillator Frequency(KHz)
OCP2030
SWITCHING BUCK REGULATOR
Tempetature VS.
Reference Output Voltage
0.507 0.506 0.505 0.504 0.503
0.502 0.501 0.500 0.499
0.498 -25
25 50 75 100 120 Tempetature(°C)
Figure 2
700 650 600 550 500 450
400 350 300 250
200-25
Tempetature VS.
Oscillator Frequency
25 50 75 100 120 Tempetature(°C)
Figure 4
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Rev. 1.0 Jan 09, 2007
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