GMO SGT1504 User Manual
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
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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
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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
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