FOSLINK FSP3127 150khz 500ma step down voltage regulator Datasheet

150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
„ FEATURES
z 3.3V, 5V, 12V, and adjustable output versions
z Adjustable version output voltage range, 1.2V to
37V ±4% max over line and load conditions
z Available in 8-pin surface mount and DIP-8
package
z Guaranteed 0.5A output current
z Input voltage range up to 40V
z Requires only 4 external components
z 150 kHz fixed frequency internal oscillator
z TTL Shutdown capability
z Low power standby mode, IQ typically 85 µA
z High Efficiency
z Uses readily available standard inductors
z Thermal shutdown and current limit protection
„ Typical Application
z
z
z
z
Simple
high-efficiency
step-down
(buck)
regulator
Efficient pre-regulator for linear regulators
On-card switching regulators
Positive to Negative convertor
„ PIN ASSIGNMENT
(Top View)
*
1
8 OUTPUT
*
2
7 VIN
*
3
6
FB 4
GND
5 ON/OFF
„ GENERAL DESCRIPTION
The FSP3127 series of regulators are monolithic
integrated circuits that provide all the active functions
for a step-down (buck) switching regulator, capable
of driving a 0.5A load with excellent line and load
regulation. These devices are available in fixed
output voltages of 3.3V, 5V, 12V, and an adjustable
output version, and are packaged in a 8-lead DIP and
a 8-lead surface mount package.
Requiring a minimum number of external
components, these regulators are simple to use and
feature internal frequency compensation, a
fixed-frequency oscillator, and improved line and
load regulation specifications.
The FSP3127 series operates at a switching
frequency of 150 kHz thus allowing smaller sized
filter components than what would be needed with
lower frequency switching regulators. Because of its
high efficiency, the copper traces on the printed
circuit board are normally the only heat sinking
needed.
A standard series of inductors (both through hole and
surface mount types) are available from several
different manufacturers optimized for use with the
FSP3127 series. This feature greatly simplifies the
design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance
on output voltage under all conditions of input
voltage and output load conditions, and ±15% on the
oscillator frequency. External shutdown is included,
featuring typically 85 µA stand-by current. Self
protection features include a two stage frequency
reducing current limit for the output switch and an
over temperature shutdown for complete protection
under fault conditions.
*: Pin 1,2,3 No internal connection, but should be soldered to PC board for best heat transit
„
ABSOLUTE MAXIMUM RATINGS(NOTE1)
Parameter
Value
Unit
Maximum Supply Voltage
45
V
ON/OFF Pin Input Voltage
-0.3 to 25
V
Feedback Pin Voltage
– 0.3 to 25
V
Output Voltage to Ground(Steady State)
-1
V
Power Dissipation
Internally limited
Maximum Junction Temperature
+150
°C
ESD Susceptibility(Note 2)
2000
V
Storage Temperature
-65 to 150
°C
Vapor Phase (60 sec.)
215
Lead Temperature (SOP8L)
°C
Infrared (15 sec.)
220
Lead Temperature (PDIP8L) (Soldering, 10 sec)
260
°C
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating
Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific
performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
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2007-4-9
150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
„
OPERATING CONDITIONS
Parameter
Input Voltage
Junction Temperature
„
Symbol
VIN
TJ
Test Conditions
Min.
4.5
-40
Typ.
Max.
40
+125
Unit
V
°C
Test Conditions
VFB = 1.3V
(Adjustable Version Only)
No Outside Circuit ,
VFB = 0V force drive on
When Current Limit Occur and
VFB < 0.5V, TA=25°C
Min.
Typ.
Max.
50
100
173
173
Unit
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Feedback Bias Current
IFB
Oscillator Frequency
Fosc
Short Circuit Oscillator
Frequency
FCSP
Saturation Voltage
VSAT
Maximum Duty Cycle(On)
Minimum Duty Cycle(Off)
DC
Current Limit
ICL
150
10
30
50
kHz
IOUT= 0.5A,
0.9
1.1
1.2
V
100
0
Output
Leakage
Current
Output=1
Quiescent Current
IQ
Standby Quiescent Current
ISTBY
ON/OFF Pin=5V,VIN = 40V
ON/OFF Pin Logic Input
Threshold Voltage
ON/OFF Pin Input Current
ON/OFF Pin Logic Input
Current
VIL
VIH
IL
Low (Regulator ON)
High (Regulator OFF)
VLOGIC=0.5V(ON)
IH
VLOGIC=2.5V(OFF)
Thermal Resistance
θJA
Output
Feedback
IL
VFB
FSP3127-ADJ
Junction to Ambient
Junction to Ambient
4.5V ≤VIN ≤40V
0.1A ≤ILOAD ≤0.5A
VOUT Programmed for 3V
0.65
0.58
2.0
SOP8L
PDIP8L
1.193
1.18
VIN =12V, ILOAD= 0.5A
80
Output
Feedback
VFB
4.5V ≤VIN ≤40V
0.1A ≤ILOAD ≤0.5A
3.168
3.135
η
VIN =12V, ILOAD= 0.5A
80
7V ≤VIN ≤40V
0.2=1A ≤ILOAD ≤2=0.5A
VIN =12V, ILOAD= 2=0.5A
4.8
4.75
82
15V ≤VIN ≤40V
0.1A ≤ILOAD ≤0.5A
11.52
Output
Feedback
Efficiency
Output
Feedback
FSP3127-5.0V
VFB
η
FSP3127-12V
VFB
1.3
1.4
A
2
50
µA
2
5
15
10
200
250
0.6
mA
mA
1.3
0.02
5
5
15
1.23
µA
V
µA
℃/W
1.267
1.28
V
%
3.3
3.432
3.465
V
%
5
12
5.2
5.25
11.4
12.48
12.6
Efficiency
η
VIN =12V, ILOAD= 0.5A
88
Specifications with boldface are for full operating temperature range, the other type are for TJ=25°C
2/8
kHz
%
150
95
η
FSP3127-3.3V
0.8
85
Efficiency
Efficiency
nA
127
110
VFB = 0V force drive on
VFB =12V force drive off
Peak Current
No Outside Circuit ,
VFB = 0V force drive on
No Outside Circuit ,
VFB = 12V force drive off
VIN = 40V
VFB = 12V force drive off
Output=0
10
2007-4-9
V
%
V
%
150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
„
FUNCTIONAL BLOCK DIAGRAM
„
FUNCTIONAL DESCROPTION
Pin Functions
VIN
This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at
this pin to minimize voltage transients and to supply the switching currents needed by the regulator.
Ground
Circuit ground.
Output
Internal switch. The voltage at this pin switches between (VIN - VSAT) and approximately +0.5V, with a duty cycle of
VOUT/VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept to
a minimum.
Feedback
Senses the regulated output voltage to complete the feedback loop.
ON/OFF
Allows the switching regulator circuit to be shut down using logic level signals thus dropping the total input supply
current to approximately 80 mA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator
on, and pulling this pin above 1.3V (up to a maximum of 25V) shuts the regulator down. If this shutdown feature is not
needed, the ON/OFF pin can be wired to the ground pin or it can be left open, in either case the regulator will be in the
ON condition.
„
3/8
TYPICAL APPLICATION CIRCUIT
2007-4-9
150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
„ TYPICAL CHARACTERISTICS
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2007-4-9
150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
„ TYPICAL CHARACTERISTICS (CONTINUED)
5/8
2007-4-9
150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
„ TYPICAL CHARACTERISTICS (CONTINUED)
„
ORDER INFORMATION
FSP3127XXXX
Package:
S: SOP8L
N: PDIP8L
„
Temperature Grade:
Output Voltage: Packing:
Blank: Tube or Bulk E: -40~125℃
Blank: ADJ
A: Tape & Reel
33: 3.3V
50: 5.0V
12: 12V
MARKING INFORMATION
(1) SOP8L
(2) PDIP8L
Logo
Logo
3127-VV
YYWWXX
Part number:
3127-ADJ: ADJ
3127-33: 3.3V
3127-50: 5.0V
3127-12: 12V
Internal code
Date code:
YY: Year (01=2001)
WW: Nth week (01~52)
6/8
3127-VV
YYWWXX
Part number:
3127-ADJ: ADJ
3127-33: 3.3V
3127-50: 5.0V
3127-12: 12V
Internal code
Date code:
YY: Year (01=2001)
WW: Nth week (01~52)
2007-4-9
150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
„
PACKAGE INFORMATION
θ
H
E
(1) SOP8L
D
7ο(4х)
e
B
A
0.015х45ο
A1
A2
7ο(4х)
VIEW “A”
Symbol
A
A1
A2
B
C
D
E
e
H
L
θ
7/8
Dimensions In Millimeters
Nom.
Max.
1.60
1.75
0.25
1.45
1.55
0.41
0.51
0.20
0.25
4.90
5.00
3.90
4.00
1.27TYP.
5.80
5.99
6.30
0.38
0.71
1.27
0ο
8ο
Min.
1.35
0.10
1.35
0.33
0.19
4.80
3.80
Dimensions In Inches
Min.
Nom.
0.053
0.063
0..004
0.053
0.057
0.013
0.016
0.0075
0.008
0.192
0.196
0.148
0.154
0.050TYP.
0.228
0.236
0.015
0.028
0ο
2007-4-9
Max.
0.069
0.010
0.061
0.020
0.010
0.200
0.160
0.248
0.050
8ο
150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
(2) PDIP8L
D
E1
E-PIN 0.018inch
E
PIN #1INDENT 0.025 DEEP 0.006-0.008 Inch
15°(4х)
7°(4х)
C
A
A2
eB
S
e
A1
L
B
B2
B1
Symbol
A
A1
A2
B
B1
B2
C
D
E
E1
e
L
eB
S
8/8
Min.
0.38
3.1
0.36
1.4
0.81
0.20
9.02
7.62
6.15
2.92
8.38
0.71
Dimensions In Millimeters
Nom.
Max.
5.33
3.30
0.46
1.52
0.99
0.25
9.27
7.94
6.35
2.54
3.3
8.89
0.84
Min.
Dimensions In Inches
Nom.
3.5
0.56
1.65
1.14
0.36
9.53
8.26
6.55
0.015
0.122
0.014
0.055
0.032
0.008
0.335
0.300
0.242
3.81
9.40
0.97
0.115
0.330
0.028
0.130
0.018
0.060
0.039
0.010
0.365
0.313
0.250
0.100
0.130
0.350
0.033
2007-4-9
Max.
0.210
0.138
0.022
0.065
0.045
0.014
0.375
0.325
0.258
0.150
0.370
0.038
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