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STEP-UP DC/DC CONTROLLER
FSP3601
FEATURES
Wide supply voltage operating range: 1.8 to 15V Reference voltage precision: 4% Low current consumption: Operation Mode 5.5mA Standby Mode: 1A 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
GENERAL DESCRIPTION
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
Digital Camera PDA Portable Equipment
PIN ASSIGNMENT
SOP8 MSOP8 TSSOP8
FB SCP Vcc BR/CTL
1 2 3 4
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
COMP OSC GND OUT
FSP3601
6 5
FSP3601
7 6 5
FSP3601
7 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
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STEP-UP DC/DC CONTROLLER
FSP3601
FUNCTIONAL BLOCK DIAGRAM
3
7
Reference voltage supply 1.25V 1
+
0.6V0.1V-
Sawtooth wave oscillator 0.1V PWM Comp.
+ + +
5
36k
Output drive control circuit
30K
Error Amp. 0.5V 500
DTC0.6V 0.22V
8
Soft start SCP 6 2 4
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 Ta+25 Ta+25 Ta+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 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 VSCP=0V
Min. -1.5 0.8
Typ. -1.0 0.9
Max. -0.7 1.0
Unit A V
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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 Idle Period Adjustment section Parameter Maximum duty cycle 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 Test Conditions VSCP=0V Min. -1.5 0.7 Typ. -1.0 0.8 Max. -0.7 0.9 Unit A V
Symbol f f/V f/T
Test Conditions RT=3.0K, CT=270pF VCC=2V to 15V Ta=0 to 85
Min. 400
Typ. 500 2 5
Max. 600 10
Unit KHz % %
Symbol TDUTY
Test Conditions RT=3.0K, CT=270pF,VFB=0.8V
Min. 75
Typ.
Max. 85
Unit %
Symbol ISTANDBY IAVE
Test Conditions Pin4 is open or VCC RB=390, VCC=020V
Min.
Typ. 5.0
Max. 1 10
Unit A mA
Symbol VFB VFB/V VFB/V IB AV BW VPOS VNEG ISOURCE ISINK
Test Conditions VCOMP=450mV VCC=2V to 15V Ta=-10 to 85 AV=0dB
Min. 480
-1.0 0.78 VCOMP=450mV 24
Typ. 500 5 1 -0.2 100 6 0.87 0.05 -40 40
Max. 520 20 1.0
Unit mV mV % A V/V MHz V A A
0.2 -24
Symbol VOH1 VOH2 VOl1 VOl2 IOSOURCE IOSINK RO
Test Conditions RB=390,IO=-15mA RB=750,IO=-10mA,VCC=1.8V RB=390,IO=15mA RB=750,IO=10mA,VCC=1.8V RB=390,VO=-0.9V RB=390,VO=-0.3V
Min. 1.0 0.8
30 20
Typ. 1.2 1.0 0.1 0.1 -40 40 30
Max. 0.2 0.2 -20 40
Unit V V V V mA mA K
Output Current Setting / Control section Parameter Symbol Pin voltage VBR Input off condition IOFF Input on condition ION Pin current range IBR
Test Conditions RB=390
Min. 0.15 -20 -1.8
Typ. 0.22
Max. 0.3 0 -4.5 -0.1
Unit V A A mA
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STEP-UP DC/DC CONTROLLER
FSP3601
TYPICAL CHARACTERISTICS
10 8 -10 6 4 2 0
Ta=25 RB=390
12 16 4 8 Supply voltage Vcc (V) Figure 1
20
Input threshold voltage variation ratio V/Vt (%)
Ambient temperature vs.Input threshold voltage variation ratio 30 10 5 0 -5
Input threshold voltage Vt (V)
Supply voltage vs. Supply current 12
High level output 1.2 High level output voltage Vout(V) 1.0 0.8 0.6 0.4 0.2 0 -10 -20 -30 -40 -50 High level output current Iout(mA) Figure 4 Vcc=2V RB=390 Ta=25
Vcc=2V
-10 -15 -25 50 75 100 0 25 Ambient Temperature Ta () Figure 3
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STEP-UP DC/DC CONTROLLER
FSP3601
TYPICAL CHARACTERISTICS (CONTINUED)
BR/CTL pin current vs. Output source current Vcc=2V Vout=0.9V Ta=25
-60 Low level output voltage Vout(V) -50 -40 -30 -20 -10 0
-0.4
-0.8
-1.2
-1.6
-2.0
BR/CTL pin current IBR(mA) Figure 6
BR/CTL pin voltage VBR(mV)
Supply current Icc(mA)
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TYPICAL CHARACTERISTICS (CONTINUED)
Frequency variation ratio f/f(%) Oscillation frequency fosc(Hz)
Frequency variation ratio f/f(%)
STEP-UP DC/DC CONTROLLER
2007-6-6
FSP3601
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
Soft start ts
Output short circuit
tpe Output short circuit
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
+
Error Amplifier 36K 500
R2
0.5V FSP3601
8
C1
Figure 12. Error Amplifier with Feedback resistance divider
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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[F] 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[F] 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 Q1 Off On BR/CTL Pin Open Bias Current Output Transistor Function Disable Enable Mode Stand-by Operation
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STEP-UP DC/DC CONTROLLER
FSP3601
APPLICATION NOTE (1)
Vin+12V U1
1 2 3 FB SCP VCC BR/CTL COMP OSC GND OUT 8 7 6 5
L1 20H D1 SCD34 R1 R2 47K 1% C2
Vout+24V/1A
C1 0.1F R3 10 Q2
C7 220F/25V
C5 0.1F R4 390 Q1
4
C8 0.1F
C4 100F/35V
FSP3601
R5 3K
C6 470PF
2N3904
R6 1K 1%
Control
R7 4.7K
Figure 14.DC 12V to DC 24V Boost Regulator
Vin+2.5V+6V U1
1 2 3 FB SCP VCC BR/CTL COMP OSC GND OUT 8 7 6 5
L1 20H C9 10F D1 SCD34 R1 C1 0.1F R3 10 Q2 L2 20H R4 390 Q1 2N3904 R5 3K C6 470PF R6 1K 1% FSP3601 C8 0.1F C2 R2 5.6K 1%
Vout+3.3V
C7 220F/25V
C5 0.1F
4
C4 100F/35V
Control
R7 4.7K
Figure15. DC2.5VDC6V to DC3.3V SEPIC Regulator
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STEP-UP DC/DC CONTROLLER
FSP3601
APPLICATION NOTE (2)
-6.8V R3 5.6K
Q5 2N3906 R2 2.2K R7 2.2K 1 3 2 U2 TL431 C1 C2 0.1F 0.1F R1 390 C3 1F
Q2 2N3904 R4 30K R6 5.1K 2 U3 TL431 3 1 C4 1F
Q3 AP2305 R5 30K Q4 2N3904 R10 5.1K
+17
D2 BAT54S C5 1F
D1 BAT54S
C6 1F
R8 6.8K
C9 1F
C8 1F
Vin U1
1 2 3 FB SCP VCC BR/CTL COMP OSC GND OUT 8 7 6 5
L1 33H
D3 SCD34
L2 33H
R9 300K
+9V
C10 0.1F Q1 R13 10
R11 C13 100F
R12 51K C11 1% C14 0.1F
C15 100F
C12
C16
C7 0.1F
4
220F/6.3vV 0.1F
R14 1K
FSP3601 R16 3K C17 470PF
Q6 2N3904
R15 3K 1%
Control
R17 4.7K
Figure16. Charge Pump DC-DC Converter Circuits
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STEP-UP DC/DC CONTROLLER
FSP3601
ORDER INFORMATION
FSP3601XXX Package: S: SOP8L TS: TSSOP8 MS: MSOP8 Packing: Blank: Tube or Bulk A: Tape & Reel Temperature Grade: H: -10~85
MARKING INFORMATION
1) SOP8 2) MSOP8
Logo
FSP3601
YYWWXX
Part number
FSC 3601
YMXX
Logo
Part number
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
YYWWXX
Part number
Internal code Date code: YY: Year (01=2001) WW: Nth week (01~52)
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STEP-UP DC/DC CONTROLLER
FSP3601
PACKAGE INFORMATION
1) SOP8
E
H
7(4)
D
7(4) 0.01545 A
e
A1
B
A2
VIEW "A" Y
Symbol A A1 A2 B C D E e H L Y
Min. 1.40 0.10 1.30 0.33 0.19 4.80 3.70
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 0 8
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 0
Max. 0.069 0.010 0.059 0.020 0.010 0.209 0.161 0.244 0.050 0.004 8
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STEP-UP DC/DC CONTROLLER
2) MSOP8
FSP3601
D
E1
E
GAGE PLANE L 0.25
DETAIL A
PIN INDICATOR 0.45mm0.038DP SURFACE POLISHED 12 (4)
A2 A1 e
A b
y
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 0 3 6 Dimensions In Inches Nom. 0.040 0.034 0.012 0.006 0.118 0.193 0.118 0.0256 0.021 3
Symbol A A1 A2 b C D E E1 e L y
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 0.016 0
Max. 0.048 0.006 0.038 0.015 0.009 0.122 0.197 0.122 0.026 0.003 6
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STEP-UP DC/DC CONTROLLER
3) TSSOP8
FSP3601
e A2 A1 b y A
E1
L1
DETAILA C
Symbol A A1 A2 b C D E E1 e L L1 y
Min. 1.05 0.05 0.20 2.90 6.20 4.30 0.50 0.90 0
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 4 8
Min. 0.041 0.002 0.008 0.114 0.244 0.169 0.02 0.035 0
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 4
Max. 0.047 0.006 0.041 0.011 0.122 0.26 0.177 0.028 0.043 0.004 8
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