GT
1504
GMOS Technology
Crop. www.gmos
■
General
Description
provide
all the active
functions
for a step-down
without
would
+4%
tolerance
on
output
voltage
under
specified
input
voltage
and output
load conditions,
and +15%
on
the oscillator
frequ
ency.
The output
version
■
Features
-
-
3.3V,
5V, 12V and adjustable
output
versions
-
- - - - - - - -
SOP
-8L
packages
■
Applications
-
- - -
Simple
High
-
effici
ency
step-down(buck)
regulator
- Battery
Charger
■
Pin
Assignments
SOP
-8L
7
6 5 (Top
View)
V
IN
Out
GND
8 SD
■
GND
Pin
Descriptions
Name
Descript
ion
V
IN
Operating
voltage
input.
Out Switching
output.
输出脚
Gnd Ground
FB
Output
voltage
feedback
control.
SD ON/OFF
Shutdown.
使能脚
150Khz, 2A PWM Buck Switching Regulator
The
GT1504 is a monolithic integrated circuit that
Adjustable version output voltage range, 1.23V to
switching regulator, capable of driving a 2A load
additional transistor component. Requiring
a minimum number of external component, the
board space can be saved easily. The external
shutdown function can be controlled by TTL logic
level and then come into standby mode. The
internal compensation makes feedback control
have good line and load regulation without external
design. Regarding protected function, thermal
shutdown is to prevent over temperature operating
from damage, and current limit is against over
current operating of the output switch. The GT1504
operates at a switching frequency of 150Khz thus
allowing smaller sized filter components than what
be needed with lower frequency switching
regulators. Other features include a guaranteed
37V +4% max over line and load condiction
Voltage mode non-synchronous PWM control
Thermal-shutdown and current-limit protection
ON/OFF shutdown control input
Input voltage range up to 40V
Output load current: 2A
150 kHz fixed frequency internal oscillator
Low power standby mode
Built-in switching transistor on chip
Efficient preregulator for linear regulators
On-card switching regulators
Positive to negative converter
included fixed 3.3V, 5V, 12V, and an adjustable
type. The packages are available in a standard
8-lead SOP8.
脚位排列
GND
GND
FB
1
2
3
4
脚位描述
输入脚
.接地脚
反馈脚
1/9
-semi.com
GT1504
GMOS Technology
Corp. www.gmos
■
Ordering
Information
Package
BLANK:
SOP
-8L
GT1504
XX X X
Packing
Blank
:
Tube
A :
Taping
-
ADJ : Adjustable
■
Block
Diagram
+ + + _
Output
SD
FB
+
150Khz, 2A PWM Buck Switching Regulator
Output version
-33 : 3.3V
-50 : 5.0V
-12 : 12V
Current
Source
bias
1.235V
Reference
200mV
2.5V
Regulator
Amp
_
Comp
Start
up
150kHz
OSC.
Comp
Comp
Pre-driver
Thermal
Limit
220mV
2A
Switch
V
IN
Gnd
2/9
-semi.com
GT1504
GMOS Technology
Corp. www.gmos
3/9
■
Absolute
Maximum
Ratings
Symbol
Parameter
Rating
Unit
V
CC
Supply
Voltage
+45 V V
SD
ON/OFF
Pin input
voltage
-0.3 to +25 V V
FB
反馈电压
Feedback
Pin voltage
-0.3 to +25 V V
OUT
Output
voltage
to
Ground
-1 V P
D
Power
dissipation
Internally
limited
W T
ST
储存温度
Storage
temperature
-65 to +150
o
C T
OP
Operating
temperature
-40 to
+125
o
C V
OP
Operating
voltage
+4.5
to
+25 V
■
Electrical
Characteristics
(All
Output
Voltage
Versions)
Unless
otherwise
specified,
V
=12V for 3.3V, 5V, adjustable
version
and V
=24V for the 12V version.
I
= 0.2A
Symbol
Paramet
er Conditions
Min.
Typ.
Max.
Unit
-50 I
B
Feedback
bias current
V
FB
=1.3V
(Adjustable
version
only)
-10 -
100 nA 127 150 173 F
OSC
oscillator
frequency
110 173
Khz Fscp
Oscillator
frequency
of
When
current
limit occurred
short
circuit
protect
and V
FB
<0.55V
30 70
Khz 1.4 V
SAT
saturation
voltage
I
OUT
=1.5A
no outside
circuit
V
FB
=0V force
driver
on
1.25
1.5
V Max.
Duty
Cycle(ON)
V
FB
=0V force
driver
on
100 DC
Min. Duty
cycle(OFF)
V
FB
=12V
force
driver
off
0 %
3.3 I
CL
current
limit
peak
current
no outside
circuit
V
FB
=0 force
driver
on
2.4 2.8
3.6
A Output
= 0V
no outside
circuit
V
FB
=12 force
driver
off
-200 uA I
L
Output
V
IN
=24V
-5 mA I
Q
Quiescent
Current
V
FB
=12 force
driver
off
5 10 mA
150 I
STBY
Standby
Quiescent
ON/OFF
pin=5V
Current
V
IN
=24V
70
200
uA V
IL
Low (regulator
ON) - 0.6 V
IH
ON/OFF
pin logic
input
High
(regulator
OFF)
2.0 1.3 - V I
H
ON/OFF
pin logic
V
LOGIC
=2.5V
(OFF)
-0.01 I
L
ON/OFF
pin input
current
V
LOGIC
=0.5V
(ON)
-0.1 -1 uA Tj
increasing
175 Ts Over
temperature
Tj decreasing
150
℃
150Khz, 2A PWM Buck Switching Regulator
反馈偏流
震荡频率
短路保
符号
输入电压
使能电压
输出电压
耗散功率
运行温度
运行电压
参数
IN
仅仅适用于可调版
IN
限流出现时
范围
单位
LOAD
饱和电压
极限电流
Output = -1V
待机静态电流
threshold voltage
使能阀值输入电压
input current 使能输入电流
shutdown threshold
饱和电压
极限电流
Leakage泄漏
Current 电流
温控阀值
输出
静态电流
无外部电路
强制驱动开
强制驱动开
强制驱动关
峰值电流
无外围电路
强制驱动
无外围电路
强制驱动关
强制驱动关
-semi.com
GT1504
GMOS Technology
Corp. www.gmos
4/9
■
Electrical
Characteristics
(Continued)
Symbo
l Parameter
Conditions
Typ.
Limit
Unit
FB
V
Output
5V < V
IN
< 40V 0.2A
< I
LOAD
< 2A V
OUT
programmed
for 3V 1.235
1.193/
1.18
V 1.267/
1.28
V
MIN
V
MAX
GT1504
-
ADJ
Efficiency
V
IN
= 12V,
I
LOAD
=2A 75 %
OUT
输出电压
V Output
voltage
5.5V
< V
IN
< 40V 0.2A
< I
LOAD
< 2A 3.3 3.168/
3.135
V V
MIN
V
MAX
GT1504
-
3.3V
Efficiency
V
IN
= 12V,
I
LOAD
=2A 75 %
OUT
V Output
voltage
8V < V
IN
< 40V 0.2A
< I
LOAD
< 2A 5 4.8/
4.75
V V
MIN
V
MAX
GT15
04-5V
Efficiency
V
IN
= 12V,
I
LOAD
=2A 80 %
OUT
V Output
voltage
15V < V
IN
< 40V 0.2A
< I
LOAD
< 2A 12 11.52/
11.4
V V
MIN
V
MAX
GT1504
-
12V
Efficiency
V
IN
= 15V,
I
LOAD
= 2A 90 %
Specifications
with boldface
type are for
full operating
temperature
range,
the other type are for T =25_C.
J
150Khz, 2A PWM Buck Switching Regulator
反馈电压
η效率
η效率
输出电压
η效率
输出电压
η效率
Feedback
3.432/3.465
5.2/5.25
12.48/12.6
-semi.com
GT1504
GMOS Technology
Corp. www.gmos
5/9
■
Typical
Performance
Characteristics
Typical
Performance
Characteristics
V
IN
=20V, I
LOAD
=2A Normalized
at T
=25oC
JOutput
current
Io
(A)
Switch
Current
Limit
Operating
Quiescent
Current
JUNCTION
TEMPERATURE(oC)
Efficiency
30 35 40
2A Load
3
SWITCH
CURRENT(A)
3
1 : -40
oC
2 : 25
oC
3 : 125
o
C
Switch
Saturation
Voltage
Shutdown
Quiescent
Current
V
ON/OFF
=5V 1 : -40
oC
2 : 25
oC
1 3 2 Switch
ON
Switch
OFF
10=10V 20V 30V V
IN
150Khz, 2A PWM Buck Switching Regulator
Normalized Output Voltage
5.10
5.05
5.00
4.95
4.90
-50 -25 0 25 50 75 100 125
JUNCTION TEMPERATURE(oC)
1.7
1.6
1.5
1.4
1.3
1.2
1
2
2.0
4 5
95
90
85
80
75
70
8.0
6.0
4.0
2.0
0.0
5V
3.3V
8 10 15 20 25
0 1 2 3 4 5 6 7
-semi.com
25.0
20.0
15.0
10.0
5.0
0.0
-50 -25 0
JUNCTION TEMPERATURE(oC)
25 50 75 100 125
200.0
130.0
100.0
80.0
40.0
0.0
oC
3 : 125
10 20 30 40
SUPPLY VOLOTAGE (V)
GT1504
GMOS Technology
Corp. www.gmos
6/9
■
Typical
Performance
Characteristics
(Continued)
JUNCTION
TEMPERATURE(oC)
1.4 5 10 15 20 22 23 24 25
ON/OFF
Pin Current
(Sinking)
150.0
V
IN
=40V
-40oC
T J125oC
50.0
0 25 50 75
100 125
Adjustable
Version
Only
1.0
Minimum
Operating
Supply
Voltage
-50 -25 0 25 50 75 100 125
V
OUT
=1.23V
I
LOAD
=120mA
JUNCTION
TEMPERATURE
(oC)
ON/OFF
Threshold
Voltage
5.0
-50 -25 0 25 50 75
100 125
Switch
Frequency
JUNCTION
TEMPERATURE
(oC)
200
-50 -25 0 25 50 75
100 125
Thermal
protection
10
JUNCT
ION TEMPERATURE(
50 75 100 125 150 175 200
o
C)
TSC OFF
50
150Khz, 2A PWM Buck Switching Regulator
5.0
4.0
3.0
2.0
0.0
JUNCTION TEMPERATURE (oC)
4.0
3.0
2.0
1.0
0.0
120.0
90.0
60.0
30.0
0.0
Feedback Pin Bias Current
40.0
30.0
20.0
10.0
0.0
-50 -25
≤ ≤
ON/OFF PIN VOLTAGE (V)
150
100
0.0
8
2
6
4
0
-semi.com
GT1504
GMOS Technology
Corp. www.gmos
7/9
■
Typical
Application
Circuit
1
2
3
12V
C
in Capacitor
FB SD Out
Inductor
Gnd
GT1504
Co
L1 3.3V/2A
Output
Load 8 7 6
39uH
R1
1%
1%
Some
standard
value
of R
1
and R
2
for most
commonly
used
output
voltage
are listed
below.
VIN(V)
/Vo ( V ) R
1
(KΩ) R
2
(KΩ) L
1
Minimum
24/12
17.6 2 68uH
12/5.0
6 2
33uH
12/3.3
3.3 2 33uH
12/2.5
2 2
27uH
12/1.8
0.91 2 22uH
5.0/3.3
3.4 2 33uH
5.0/2.5
2.1 2 27uH
5.0/1.8
0.95 2 22uH
■
Function
Description
Pin Functions
+V
IN
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
Internal
switch
and power
output.
The voltage
at
this pin switches
between
(+V
IN
V
SAT
) and approximately
0.5V,
with a duty cycle
of
approximately
V
OUT
/ V
IN
. The PC board
copper
area connected
to
this
pin should
be
kept a minimum
in
order
to
reduce
the coupling
sensitivity
to
the circuitry
Ground
ON /OFF
Allows
the switching
regulator
circuit
to be
shutdo
wn using
logic
level
signals
thus dropping
the total input
150Khz, 2A PWM Buck Switching Regulator
DC Input
Vin
-ADJ
4
5
D1
Schottky
Diode
R2
470uF
Capacitor
regulator.
Out
Circuit ground.
Feedback
Complete the feedback loop by sensing the regulated output voltage
-semi.com
GT1504
GMOS Technology
Corp. www.gmos
8/9
supply
current
to
approximately
100uA.
Pulling
this pin below
a
threshold
voltage
of
approximately
1.3V
If this shutdown
feature
is
not needed,
the ON /OFF
pin must
be
wired
to
the ground
pin, in either
case
the regulator
will be in the ON condi
tion.
data for these
curves
was taken
with the GT1504
operating
as a
buck
switching
regulator
in an
ambient
temperature
of 25 C
(still air). These
temperature
increments
are all
approximate
and are affected
by
many
o
factors.
Some
of
these
factors
include
board
size,
shape
,thickness
,position
,location,
and even
board
■
Marking
Information
(1) SOP
-8L
GT
1504
-XX
( Top view )
1504-ADJ: ADJ
Logo ID code Year: "04" = 2004 "03" = 2003
YY WW ~
Xth week: 01~52
150Khz, 2A PWM Buck Switching Regulator
turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 25V) shuts the regulator down.
Thermal Considerations
The SOP-8 package needs a heat sink under most condictions . The size of the heatsink depends on the
input voltage, the output voltage, the load current and the ambient temperature. The GT1504 junction
temperature rises above ambient temperature for a 2A load and different input and output voltages. The
temperature. Other factors are trace width, total printed circuit copper area, copper thickness , single or
double-sided, multi-layer board and amount of solder on the board. Higher ambient temperatures require
more heat sinking.
For the best thermal performance ,wide copper traces and generous amounts of printed circuit board copper
should be used in the board layout. (One exception is the out(switch) pin, which should not have large areas
of copper.) Large areas of copper provide the best transfer of heat(lower thermal resistance) to the
surrounding air, and moving air lowers the thermal resistance even further.
The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other
components on the board , as well as whether the surrounding air is still or moving. Furthermore, some of
these components such as the catch diode will add heat to the PC board and heat can vary as the input
voltage changes. For the inductor, depending on the phical size, type of core material and the DC resistance,
it could either act as a heat sink taking heat away from the board, or it could add heat to the board.
Output Type:
1504-33: 3.3V
1504-50: 5.0V
1504-12: 12V
-semi.com
GT1504
GMOS Technology
Corp. www.gmos
■
Package
Information
(1) Package
Type:
SOP
-8L
0.015x45
L
B e y 7 (4X) D 7 (4X) VIEW "A"
Dimensions
In
Millimeters
Dimensions
In
Inches
Symbol
Min.
Nom.
Max.
Min.
Nom.
Max.
A 1.40 1.60 1.75 0.055
0.063
0.069
A1
0.10
−0.25 0.040
−0.100
A2
1.30 1.45 1.50 0.051
0.057
0.059
B
0.33 0.41 0.51 0.013
0.016
0.020
C
0.19 0.20 0.25 0.0075
0.008
0.010
D
4.80 4.85 5.05 0.189
0.191
0.199
E
3.80 3.91 4.00 0.150
0.154
0.157 e −1.27
0.050
−H 5.79 5.99 6.20 0.228
0.236
0.244
L
0.38 0.71 1.27 0.015
0.028
0.050
y
0.10
0.004
θ 0
O
−
8
O
0
O
−
8
O
150Khz, 2A PWM Buck Switching Regulator
VIEW "A"
9/9
-semi.com
− −
− −
− −
Loading...