OCP3601

Max.
Unit
V
V
0.2
V
0.2
V
-20
mA
mA
40
KΩ
Output Current Setting / Control section
Parameter
Symbol
Pin voltage
VBR
Input off condition
IOFF
Input on condition
ION
Pin current range
IAVE
Test Conditions
RT=3.0KΩ, CT=270pF,VFB=0.8V
Min. Typ. Max. Unit
75
85
%
Test Conditions
Pin4 is open or VCC RB=390Ω, VCC=0∽20V
Min. Typ. Max. Unit
1
µA
5.0 10 mA
Symbol
VOH1 VOH2 VOl1 VOl2 IOSOURCE IOSINK RO
Test Conditions
RB=390Ω,IO=-15mA RB=750Ω,IO=-10mA,VCC=1.8V RB=390Ω,IO=15mA RB=750Ω,IO=10mA,VCC=1.8V RB=390Ω,VO=-0.9V RB=390Ω,VO=-0.3V
Pin Assignment
1) SOP8
2) MSOP8
FB 1 SCP 2 Vcc 3 BR/CTL 4
8 COMP
7 OSC
OCP3601
6 GND
5 OUT
FB 1 SCP 2 Vcc 3 BR/CTL 4
OCP3601
8 COMP 7 OSC 6 GND 5 OUT
Pin Description
Power supply voltage Output source current Output sink current
Allowable dissipation
Operating temperature Storage temperature SOP8 lead Temperature (solding,10 sec) MSOP8Lead Temperature (soldering,10 sec)
Ambient temperature vs.Input threshold voltage variation ratio 30
10
Vcc=2V
5
0
-5
-10
-15 -25 0 25 50 75 100 Ambient Temperature Ta (℃) Figure 3
Input threshold voltage Vt (V)
DC Electrical Characteristics
Under Voltage Lock-Out section (U.V.L.O.)
Parameter
Symbol
Low threshold voltage Upper threshold voltage
VLOW VUPPER
Soft Start section (S.S.) Parameter
S.C.P. threshold voltage
VSCP
Oscillator section Parameter
Oscillation frequency Frequency change with voltage Frequency change with temperature
Symbol f
∆f/∆V ∆f/∆T
OCP3601
Step-Up DC/DC Controller
Supply voltage vs. Input threshold voltage 1.2 Ta=25℃ 1.0
0.8
0.6
0.4
0.2
0 4 8 12 16 20 Supply voltage Vcc (V) Figure 2
High level output voltage Vout(V)
Test Conditions VSCP=0V
Min. -1.5 0.7
Typ. -1.0 0.8
Max. Unit
-0.7 μA
0.9
V
Test Conditions
RT=3.0KΩ, CT=270pF VCC=2V to 15V Ta=0℃ to 85℃
Min. Typ. Max. Unit
400 500 600 KHz
Input source current
Soft start threshold voltage
Symbol ISS VSST
SOP8 MSOP8
+15V -50mA +50mA Ta≦+25℃ Ta≦+25℃ -10℃∽+85℃ -55℃∽+125℃ +260℃ +260℃
Test Conditions
Min. 480
-1.0
0.78
24
Min. 1.0 0.8
30 20
Typ. 500
5 1 -0.2 100 6 0.87 0.05 -40 40
Typ. 1.2 1.0 0.1 0.1 -40 40 30
Max. 520 20
1.0
0.2 -24
Unit mV mV % µA V/V MHz
V
µA µA
Min.
Typ.
1.1
1.3
Test Conditions VSCP=0V
Min. -1.5 0.8
Typ. -1.0 0.9
570mW 400mW
Max. Unit
0.9
V
1.5
V
Max. Unit
-0.7 μA
1.0
V

Page2 - 14
Rev. 1.2 Feb 07, 2007
Output voltage
Positive
Swing
Negative
Output source current
Output sink current
Symbol VFB
∆VFB/∆V ∆VFB/∆V
IB AV BW VPOS VNEG ISOURCE ISINK
Test Conditions VCOMP=450mV VCC=2V to 15V

Page1 - 14
Rev. 1.2 Feb 07, 2007
Functional Block Diagram
OCP3601
Step-Up DC/DC Controller
3
7
Reference voltage supply
0.6V0.1V-
1.25V
1
Error Amplifier section
Parameter
Input threshold voltage
VT change with voltage
VT change with temperature
Input basic current
Voltage Gain
Frequency bandwidth
2
10
%
5
%
Idle Period Adjustment section Parameter
Maximum duty cycle
Total device section Parameter
Stand-by current Average supply current
Symbol TDUTY
Symbol ISTANDBY
Name
No.
FB
1
SCP
2
VCC
3
BR/CTL
4
OUT
5
GND
6
OSC
7
COMP
8
I/O
Description
I
Error amplifier inverting input pin
I
Connected a capacitor Soft start and SCP function pin
P
IC Power supply
Features
z Wide supply voltage operating range: 1.8 to 15V z Reference voltage precision: 4% z Low current consumption: Operation Mode 5.5mA
Standby Mode: 1µA z High speed oscillator frequency: 1MHz max z Programmable Soft Start function (SS) z Short Circuit Protection function (SCP) z Totem-pole output with adjustable on/off current
Supply voltage vs. Supply current 12
Ta=25℃
10
RB=390Ω
8 -10
6
4
2
0 4 8 12 16 20 Supply voltage Vcc (V)
Figure 1
Input threshold voltage variation ratio ∆V/Vt (%)
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
-
36kΩ
+
Error Amp.
Sawtooth wave
oscillator
0.1V PWM Comp.
+ + +
Output drive control circuit
5 30KΩ
0.5V
500Ω
DTC0.6V
0.22V
8
Soft start SCP
6
2
4
Absolute Maximum Ratings
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.
(for NPN transistors or n-channel MOSFET) z Logic level control stand-by mode function z Package: SOP8/MSOP8
Typical Application
z Digital Camera z PDA z Portable Equipment
High level output
IBR
Test Conditions RB=390Ω
Min.
Typ.
Max.
Unit
0.15
0.22
0.3
V
-20
0
µA
-4.5
µA
-1.8
-0.1
mA

Page3 - 14
Rev. 1.2 Feb 07, 2007
Typical Characteristics
Ta=-10℃ to 85℃
AV=0dB
VCOMP=450mV
Output section Parameter
Output high voltage Output high voltage Output saturation voltage Output saturation voltage Output source current Output sink current Internal pull-down resistor
OCP3601
Step-Up DC/DC Controller
DC Electrical Characteristics (Cont.)
Short Circuit Protection section (S.C.P.)
Parameter
Symbol
Input source current
ISCP