STEP-UP DC/DC CONTROLLER FSP3601 FEATURES z z z z z z z z z GENERAL DESCRIPTION Wide supply voltage operating range: 1.8 to 15V Reference voltage precision: 4% Low current consumption: Operation Mode 5.5mA Standby 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 The FSP3601 is a boost topology switching regulator control IC for battery-used applications field. The FSP3601 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. TYPICAL APPLICATION z z z Digital Camera PDA Portable Equipment PIN ASSIGNMENT SOP8 MSOP8 FB 1 8 COMP SCP 2 7 OSC Vcc 3 BR/CTL 4 FSP3601 FB 1 SCP 2 6 GND Vcc 3 5 OUT BR/CTL 4 FSP3601 TSSOP8 FB 1 OSC SCP 2 6 GND Vcc 5 OUT BR/CTL 4 8 COMP 7 3 FSP3601 8 COMP 7 OSC 6 GND 5 OUT PIN DESCRIPTION 1/14 Name FB No. 1 I/O I SCP 2 I VCC BR/CTL OUT GND OSC COMP 3 4 5 6 7 8 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 2007-6-6 STEP-UP DC/DC CONTROLLER FSP3601 FUNCTIONAL BLOCK DIAGRAM 7 3 Reference voltage supply 0.6V- Sawtooth wave oscillator 0.1V- 1.25V 1 - 36kΩ + + + + Error Amp. 0.5V 5 0.1V PWM Comp. 30KΩ Output drive control circuit DTC0.6V 500Ω 0.22V 8 Soft start SCP 4 2 6 ABSOLUTE MAXIMUM RATINGS Power supply voltage Output source current Output sink current SOP8 MSOP8 TSSOP8 Allowable dissipation Operating temperature Storage temperature SOP8 lead Temperature (solding,10 sec) TSSOP8 Lead Temperature (solding,10 sec) MSOP8Lead Temperature (soldering,10 sec) 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 Soft Start section (S.S.) Parameter Input source current Soft start threshold voltage 2/14 +15V -50mA +50mA Ta≦+25℃ Ta≦+25℃ Ta≦+25℃ -10℃∽+85℃ -55℃∽+125℃ +260℃ +260℃ +260℃ Symbol ISS VSST Test Conditions Test Conditions VSCP=0V Min. Typ. 1.1 1.3 Min. -1.5 0.8 Typ. -1.0 0.9 2007-6-6 Max. 0.9 1.5 Max. -0.7 1.0 Unit V V Unit μA V STEP-UP DC/DC CONTROLLER FSP3601 DC ELECTRICAL CHARACTERISTICS (CONTINUED) Short Circuit Protection section (S.C.P.) Parameter Symbol Input source current ISCP 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 Idle Period Adjustment section Parameter Symbol Maximum duty cycle TDUTY Total device section Parameter Stand-by current Average supply current 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 ISTANDBY IAVE Symbol VFB ∆VFB/∆V ∆VFB/∆V IB AV BW VPOS VNEG ISOURCE ISINK Symbol VOH1 VOH2 VOl1 VOl2 IOSOURCE IOSINK RO Output Current Setting / Control section Parameter Symbol Pin voltage VBR Input off condition IOFF Input on condition ION Pin current range IBR 3/14 Test Conditions VSCP=0V Min. -1.5 0.7 Typ. -1.0 0.8 Max. -0.7 0.9 Unit μA V Test Conditions RT=3.0KΩ, CT=270pF VCC=2V to 15V Ta=0℃ to 85℃ Min. 400 Typ. 500 2 5 Max. 600 10 Unit KHz % % Test Conditions RT=3.0KΩ, CT=270pF,VFB=0.8V Min. Typ. Max. Unit 85 % Test Conditions Pin4 is open or VCC RB=390Ω, VCC=0∽20V Min. Max. 1 10 Unit µA mA Test Conditions VCOMP=450mV VCC=2V to 15V Ta=-10℃ to 85℃ 75 Min. 480 -1.0 AV=0dB 0.78 VCOMP=450mV 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 Test Conditions RB=390Ω 24 Min. 1.0 0.8 30 20 Min. 0.15 -20 -1.8 Typ. 5.0 Typ. 500 5 1 -0.2 100 6 0.87 0.05 -40 40 Max. 520 20 Typ. 1.2 1.0 0.1 0.1 -40 40 30 Max. 40 Unit V V V V mA mA KΩ Typ. 0.22 Max. 0.3 0 -4.5 -0.1 Unit V µA µA mA 1.0 0.2 -24 0.2 0.2 -20 2007-6-6 Unit mV mV % µA V/V MHz V µA µA STEP-UP DC/DC CONTROLLER FSP3601 Supply voltage vs. Supply current 12 Ta=25℃ RB=390Ω 10 8 -10 6 4 2 0 12 16 4 8 Supply voltage Vcc (V) Input threshold voltage Vt (V) TYPICAL CHARACTERISTICS 20 Ambient temperature vs.Input threshold voltage variation ratio 30 10 Vcc=2V 5 0 -5 -10 -15 4/14 -25 50 75 100 0 25 Ambient Temperature Ta (℃) Figure 3 High level output 1.2 High level output voltage Vout(V) Input threshold voltage variation ratio ∆V/Vt (%) Figure 1 1.0 Vcc=2V RB=390Ω Ta=25℃ 0.8 0.6 0.4 0.2 0 -10 -20 -30 -40 -50 High level output current Iout(mA) Figure 4 2007-6-6 STEP-UP DC/DC CONTROLLER FSP3601 TYPICAL CHARACTERISTICS (CONTINUED) Low level output voltage Vout(V) -60 -50 BR/CTL pin current vs. Output source current Vcc=2V Vout=0.9V Ta=25℃ -40 -30 -20 -10 0 -0.4 -0.8 -1.2 -1.6 -2.0 5/14 Supply current Icc(mA) BR/CTL pin voltage VBR(mV) BR/CTL pin current IBR(mA) Figure 6 2007-6-6 Frequency variation ratio ∆f/f(%) 6/14 Frequency variation ratio ∆f/f(%) Oscillation frequency fosc(Hz) STEP-UP DC/DC CONTROLLER FSP3601 TYPICAL CHARACTERISTICS (CONTINUED) 2007-6-6 STEP-UP DC/DC CONTROLLER FSP3601 TIMING WAVEFORM COMP pin voltage Reference input for short circuit detection comparator Idle period setting voltage Soft start setting voltage OUT pin waveforms SCP pin waveforms ON Power supply control SW OFF tpe Output short circuit Output short circuit Soft start ts Short circuit detection DETAILED DESCRIPTION Voltage reference A 1.25V regulator operating from VCC is used to power the internal circuitry of the FSP3601. An internal resister divider provides 0.5V reference for the error amplifier, Soft-start (typ. 0.9V) and SCP (typ.0.8V). Error amplifier The error amplifier compares a sample of the dc-dc converter output voltage to the 0.5V reference and generates an error signal for the PWM comparator. Output voltage of the dc-dc converter is setting with the resistor divider using the following expression (see fig12): VOUT = (1+R1/ R2)*0.5 Vout R1 1 R2 Error Amplifier 36K + 500 0.5V FSP3601 8 C1 Figure 12. Error Amplifier with Feedback resistance divider 7/14 2007-6-6 STEP-UP DC/DC CONTROLLER FSP3601 Oscillator The oscillator frequency can be set between 20 KHz and 500 KHz by connecting a resistor and a capacitor at OSC pin of FSP3601 to ground. The oscillator frequency can be determined by using the graph shown in figure 9. The oscillator output is a sawtooth wave with a minimum value of approximately 0.1V and a maximum value of approximately 0.6V. The PWM comparator compares the oscillator voltage with error amplifier output voltage; internal DTC voltage (typ.0.6V) and soft start setting voltage. When the sawtooth wave is lower than the above three output voltage, the output of FSP3601 is high (Turn on NPN transistor or NMOS). Under voltage lockout (UVLO) The under voltage lockout circuits turn the output off whenever the supply voltage drop too low (approximately 0.9V at 25 ℃) for proper operation .A hysterics voltage of 200 mV eliminates false triggering on noise and chattering. Soft Start / Short-circuit protection (S.S. / S.C.P.) The soft start is function after power on, and the interval of the soft start time is determined by capacitor connected to SCP pin (pin 2). When soft start function finished, the internal soft start voltage is setting high, but external SCP pin is setting low in order to change to short circuit detection / protection function. The time of soft start is following expression: TSS=0.35*C[μF] The short circuit protection is functional due to a heavy loading drop and output of error amplifier (COMP pin) is maintain a VPOS (typ.0.87V), the capacitor is charged until SCP threshold voltage (typ.0.8V), then FSP3601 output is disable (internal pull-low ) and the capacitor is discharged to low . The time of short circuit protection is following expression: TSCP=0.8*C[μF] Output transistor The FSP3601 has a totem-pole transistor with a 40 mA source/sink current rating to drive an external NPN transistor or NMOS transistor directly. The driving current capability depends on a resistor R that is connected to BR/CTL pin (pin4) of FSP3601. (see fig.13) FSP3601 4 BR/CTL R Control Q1 Figure13. Output transistor driving control circuit BR/CTL pin can also use to control the output of FSP3601 for disable or enable function of system. Control Pin Low High 8/14 Q1 Off On BR/CTL Pin Open Bias Current Output Transistor Function Disable Enable 2007-6-6 Mode Stand-by Operation STEP-UP DC/DC CONTROLLER FSP3601 APPLICATION NOTE (1) Vin+12V L1 20µH D1 SCD34 Vout+24V/1A U1 1 FB 2 3 C7 C5 220µF/25V 4 COMP SCP OSC VCC GND BR/CTL OUT R1 R2 47K 1% 8 C1 7 C2 0.1µF 6 R3 10 5 Q2 0.1µF C8 C4 0.1µF 100µF/35V FSP3601 R4 390 Control Q1 R5 C6 2N3904 3K 470PF R6 1K 1% R7 4.7K Figure 14.DC 12V to DC 24V Boost Regulator L1 20µH C9 10µF D1 SCD34 Vin+2.5V∽+6V Vout+3.3V U1 1 2 3 C7 220µF/25V C5 4 R1 FB COMP SCP OSC VCC GND BR/CTL OUT 8 C1 7 0.1µF C2 6 R3 10 5 0.1µF R4 R2 5.6K 1% Q2 L2 C8 C4 20µH 0.1µF 100µF/35V FSP3601 390 Control Q1 R5 C6 2N3904 3K 470PF R6 1K 1% R7 4.7K Figure15. DC2.5V∽DC6V to DC3.3V SEPIC Regulator 9/14 2007-6-6 STEP-UP DC/DC CONTROLLER FSP3601 APPLICATION NOTE (2) -6.8V Q5 2N3906 R3 5.6K C6 1µF D2 BAT54S R7 2.2K R8 6.8K 1 3 2 Q3 AP2305 Q2 2N3904 R2 2.2K C1 C2 0.1µF 0.1µF R1 390 D1 BAT54S C5 1µF C3 1µF U2 TL431 Vin R4 30K L1 33µH D3 SCD34 R6 5.1K 2 U3 TL431 3 C4 1µF 1 R5 30K Q4 2N3904 C9 1µF R9 300K L2 33µH R10 5.1K +9V U1 1 2 3 C12 C16 220µF/6.3vV 0.1µF C7 4 FB COMP SCP OSC VCC GND BR/CTL C10 R11 0.1µF 6 Q1 5 C13 100µF R12 51K C11 1% C14 0.1µF R13 10 0.1µF R14 1K FSP3601 Q6 2N3904 Control OUT 8 7 R16 3K C17 470PF R15 3K 1% R17 4.7K Figure16. Charge Pump DC-DC Converter Circuits 10/14 2007-6-6 +17 C15 100µF C8 1µF STEP-UP DC/DC CONTROLLER FSP3601 ORDER INFORMATION FSP3601XXX Packing: Blank: Tube or Bulk A: Tape & Reel Package: S: SOP8L TS: TSSOP8 MS: MSOP8 Temperature Grade: H: -10~85℃ MARKING INFORMATION 1) SOP8 2) MSOP8 Logo FSP3601 Part number FSC 3601 Logo Part number YMXX YYWWXX Internal code Date code: YY: Year (01=2001) WW: Nth week (01~52) Internal code Date code: Y: Year (1=2001) M: Month (1~9, O, N, D) 3) TSSOP8 FSP3601 Part number YYWWXX Internal code Date code: YY: Year (01=2001) WW: Nth week (01~52) 11/14 2007-6-6 STEP-UP DC/DC CONTROLLER FSP3601 PACKAGE INFORMATION θ H E 1) SOP8 D 7ο(4х) B A1 e 0.015х45ο A A2 7ο(4х) VIEW “A” Y Symbol A A1 A2 B C D E e H L Y θ 12/14 Dimensions In Millimeters Nom. Max. 1.60 1.75 0.25 1.45 1.50 0.41 0.51 0.20 0.25 5.05 5.30 3.90 4.10 1.27 5.79 5.99 6.20 0.38 0.71 1.27 0.10 0ο 8ο Min. 1.40 0.10 1.30 0.33 0.19 4.80 3.70 Dimensions In Inches Min. Nom. 0.055 0.063 0..004 0.051 0.057 0.013 0.016 0.0075 0.008 0.189 0.199 0.146 0.154 0.050 0.228 0.236 0.015 0.028 0ο 2007-6-6 Max. 0.069 0.010 0.059 0.020 0.010 0.209 0.161 0.244 0.050 0.004 8ο STEP-UP DC/DC CONTROLLER FSP3601 2) MSOP8 D E1 E GAGE PLANE L 0.25 DETAIL A PIN INDICATOR Ф0.45mmх0.038DP SURFACE POLISHED 12ο (4х) A2 A1 A e b y Symbol A A1 A2 b C D E E1 e L y θ 13/14 Dimensions In Millimeters Nom. Max. 1.02 1.22 0.15 0.86 0.97 0.30 0.38 0.15 0.23 3.00 3.10 4.90 5.00 3.00 3.10 0.65 0.40 0.53 0.66 0.076 0ο 3ο 6ο Min. 0.81 0.05 0.76 0.28 0.13 2.90 4.80 2.90 Min. 0.032 0.002 0.030 0.011 0.005 0.114 0.189 0.114 Dimensions In Inches Nom. 0.040 0.016 0.034 0.012 0.006 0.118 0.193 0.118 0.0256 0.021 0ο 3ο 2007-6-6 Max. 0.048 0.006 0.038 0.015 0.009 0.122 0.197 0.122 0.026 0.003 6ο STEP-UP DC/DC CONTROLLER FSP3601 3) TSSOP8 A A2 DETAILA A1 b Symbol A A1 A2 b C D E E1 e L L1 y θ 14/14 L1 E1 e Min. 1.05 0.05 0.20 2.90 6.20 4.30 0.50 0.90 0ο C y Dimensions In Millimeters Nom. Max. 1.10 1.20 0.10 0.15 1.00 1.05 0.25 0.28 0.13 3.05 3.10 6.40 6.60 4.40 4.50 0.65 0.60 0.70 1.00 1.10 0.10 4ο 8ο 0.02 0.035 Dimensions In Inches Nom. 0.043 0.004 0.039 0.01 0.005 0.12 0.252 0.173 0.026 0.024 0.039 0ο 4ο Min. 0.041 0.002 0.008 0.114 0.244 0.169 2007-6-6 Max. 0.047 0.006 0.041 0.011 0.122 0.26 0.177 0.028 0.043 0.004 8ο