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OCP3601
Step-Up DC/DC Controller
General Description
The OCP3601 is a boost topology switching regulator control IC for battery-used applications field. The OCP3601
includes a totem-pole single output stage for driving NPN transistor or N-MOS, high precision reference (0.5V) for
comparing output voltage with feedback amplifier, an internal dead-time control for controlling the minimum duty cycle,
programmable soft start with short circuit protection function and logic level control for operating mode or standby
mode.
Features
Wide supply voltage operating range: 1.8 to 15V
Reference voltage precision: 4%
Low current consumption: Operation Mode 5.5mA
Standby-by Mode: 1μA
High speed oscillator frequency: 1MHz max
Programmable Soft Start function (SS)
Short Circuit Protection function (SCP)
Totem-pole output with adjustable on/off current
(for NPN transistors or n-channel MOSFET)
Logic level control stand-by mode function
Package: SOP8/MSOP8/TSSOP8
Typical Application
Digital Camera
PDA
Portable Equipment
Pin Assignment
SOP8
MSOP8
TSSOP8
FB 1
SCP 2
Vcc 3
BR/CTL 4
OCP3601
8 COMP
FB
7 OSC
SCP
6 GND
Vcc
BR/CTL
5 OUT
1
2
3
4
OCP3601
8 COMP
FB 1
7 OSC
6 GND
SCP 2
Vcc 3
5 OUT BR/CTL 4
OCP3601
8 COMP
7 OSC
6 GND
5 OUT
Pin Description
Name
FB
SCP
VCC
BR/CTL
OUT
GND
OSC
COMP
No.
1
2
3
4
5
6
7
8
I/O Description
I Error amplifier inverting input pin
I
Connected a capacitor
Soft start and SCP function pin
P IC Power supply
I Output current setting and control pin
O Totem-pole output
P IC ground
I Capacitor and resistor connected for the frequency of oscillation
O Error amplifier compensation output
Page1 - 17
Rev. 1.1 Sep 26, 2005
Free Datasheet http://www.Datasheet4U.com

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OCP3601
Step-Up DC/DC Controller
Functional Block Diagram
37
Reference
voltage
supply
0.6V-
0.1V-
1.25V
1
36kΩ
-
+
Error Amp.
0.5V
500Ω
8
Sawtooth
wave
oscillator
0.1V
PWM
Comp.
-
+
+
+
DTC0.6V
Output drive
control circuit
0.22V
5
30KΩ
Soft start SCP
62
4
Order Information
Part Number
OCP3601S
OCP3601SA
OCP3601TS
OCP3601TSA
OCP3601MS
OCP3601MSA
Operating Temperature
-10℃ ~ +85℃
-10℃ ~ +85℃
-10℃ ~ +85℃
-10℃ ~ +85℃
-10℃ ~ +85℃
-10℃ ~ +85℃
Package
SOP8
SOP8
TSSOP8
TSSOP8
MSOP8
MSOP8
Description
Tube
Tape & Reel
Tube
Tape & Reel
Tube
Tape & Reel
Page2 - 17
Rev. 1.1 Sep 26, 2005
Free Datasheet http://www.Datasheet4U.com

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OCP3601
Step-Up DC/DC Controller
Absolute Maximum Ratings
Power supply voltage
Output source current
Output sink current
Allowable dissipation
Operating temperature
Storage temperature
SOP8 lead Temperature (solding,10 sec)
TSSOP8 Lead Temperature (solding,10 sec)
MSOP8Lead Temperature (soldering,10 sec)
SOP8
MSOP8
TSSOP8
+15V
-50mA
+50mA
T a+25
T a+25
T a+25
-10℃∽+85
-55℃∽+125
+260
+260
+260
570mW
400mW
400mW
DC Electrical Characteristics
Under Voltage Lock-Out section (U.V.L.O.)
Parameter
Symbol
Low threshold voltage
VLOW
Upper threshold voltage
VUPPER
Test Conditions
M in.
1.1
Typ.
1.3
M ax.
0.9
1.5
Unit
V
V
Soft Start section (S.S.)
Parameter
Input source current
Soft start threshold voltage
Symbol
ISS
VSST
Test Conditions
VSCP=0V
Min.
-1.5
0.8
Typ.
-1.0
0.9
M ax.
-0.7
1.0
Unit
μA
V
Short Circuit Protection section (S.C.P.)
Parameter
Symbol
Input source current
ISCP
S.C.P. threshold voltage
VSCP
Test Conditions
VSCP=0V
Min.
-1.5
0.7
Typ.
-1.0
0.8
M ax.
-0.7
0.9
Unit
μA
V
Oscillator section
Parameter
Oscillation frequency
Frequency change with voltage
Frequency change with temperature
Symbol
f
Δf/ΔV
Δf/ΔT
Test Conditions
RT=3.0KΩ, CT=270pF
VCC=2V to 15V
Ta=0to 85
Min.
400
Typ.
500
2
5
Max.
600
10
Unit
KHz
%
%
Idle Period Adjustment section
Parameter
Maximum duty cycle
Total device section
Parameter
Stand-by current
Average supply current
Symbol
T DUTY
Symbol
ISTANDBY
IAVE
Test Conditions
R T=3.0KΩ,
CT=270pF,VFB=0.8V
Min. Typ. Max. Unit
75 85 %
Test Conditions
Pin4 is open or VCC
RB=390Ω, VCC=020V
Min.
Typ.
5.0
Max.
1
10
Unit
μA
mA
Page3 - 17
Rev. 1.1 Sep 26, 2005
Free Datasheet http://www.Datasheet4U.com