FOSLINK FSP3601MSAH Step-up dc/dc controller Datasheet

STEP-UP DC/DC CONTROLLER
FSP3601
„ FEATURES
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„ 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
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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
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