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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
8 7
COMP OSC GND OUT
FB SCP Vcc BR/CTL
1 2 3 4
8
COMP OSC GND OUT
FB SCP Vcc
1 2 3
8 7
COMP OSC GND OUT
OCP3601
Vcc BR/CTL 3 4 6 5
OCP3601
7 6 5
OCP3601
6 5
BR/CTL 4
Pin Description
Name FB SCP VCC BR/CTL OUT GND OSC COMP No. 1 2 3 4 5 6 7 8 I/O I I P I O P I O Description Error amplifier inverting input pin Connected a capacitor Soft start and SCP function pin IC Power supply Output current setting and control pin Totem-pole output IC ground Capacitor and resistor connected for the frequency of oscillation Error amplifier compensation output
Page1 - 17
Rev. 1.1 Sep 26, 2005
Free Datasheet http://www.Datasheet4U.com
OCP3601
Step-Up DC/DC Controller
Functional Block Diagram
3
7
Reference voltage supply 1.25V 1
+
0.6V0.1VSawtooth wave oscillator 0.1V PWM Comp.
+ + +
5
36k Ω
Output drive control circuit
30KΩ
Error Amp. 0.5V 500Ω DTC0.6V
0.22V 8
Soft start SCP 2 4
6
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
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 V LOW Upper threshold voltage V UPPER Soft Start section (S.S.) Parameter Input source current Soft start threshold voltage Test Conditions Min. 1.1 Typ. 1.3 Max. 0.9 1.5 Unit V V
Symbol ISS VSST
Test Conditions V SCP=0V
Min. -1.5 0.8
Typ. -1.0 0.9
Max. -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 V SCP Oscillator section Parameter Oscillation frequency Frequency change with voltage Frequency change with temperature Idle Period Adjustment section Parameter Maximum duty cycle Total device section Parameter Stand-by current Average supply current
Test Conditions V SCP=0V
Min. -1.5 0.7
Typ. -1.0 0.8
Max. -0.7 0.9
Unit μA V
Symbol f Δf/ΔV Δf/ΔT
Test Conditions R T=3.0KΩ, CT=270pF V CC=2V to 15V Ta =0℃ to 85℃
Min. 400
Typ. 500 2 5
Max. 600 10
Unit KHz % %
Symbol T DUTY
Test Conditions R T=3.0KΩ, CT=270pF,V FB=0.8V
Min. 75
Typ.
Max. 85
Unit %
Symbol ISTANDBY IAVE
Test Conditions Pin4 is open or VCC RB =390Ω , V CC=0 ∽20V
Min.
Typ. 5.0
Max. 1 10
Unit μA mA
Page3 - 17
Rev. 1.1 Sep 26, 2005
Free Datasheet http://www.Datasheet4U.com
OCP3601
Step-Up DC/DC Controller
DC Electrical Characteristics (Cont.)
Error Amplifier section Parameter Input threshold voltage VT change with voltage VT change with temperature Input basic current Voltage Gain Frequency bandwidth Output voltage Positive Swing Negative Output source current Output sink current 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 Symbol V FB ΔVFB /ΔV ΔVFB /ΔV IB AV BW VPOS VNEG ISOURCE ISINK Test Conditions V COMP=450mV V CC=2V to 15V T a=-10℃ to 85℃ Min. 480 Typ. 500 5 1 -0.2 100 6 0.87 0.05 -40 40 Max. 520 20 1.0 Unit mV mV % μA V/V MHz V μA μA
-1.0 AV =0dB 0.78 V COMP=450mV
0.2 -24
24
Symbol V OH1 V OH2 VOl1 VOl2 IOSOURCE IOSINK RO
Test Conditions R B=390Ω ,IO=-15mA R B=750Ω ,IO=-10mA,VCC =1.8V R B=390Ω ,IO=15mA R B=750Ω ,I.