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GM1117 데이터시트 PDF




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부품번호 GM1117 기능
기능 LOW DROPOUT PRECISION LINEAR REGULATORS
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GM1117 데이터시트, 핀배열, 회로
www.DataSheet4U.com
AA
MICROELECTRONICS
Power Management
GM1117
1.0A LOW DROPOUT PRECISION LINEAR REGULATORS
Description
GM1117 of positive adjustable and fixed regulators is de-
signed to provide 1.0A output with low dropout voltage per-
formance. On-chip trimming adjusts the reference voltage
to 1%. For usage on working in post regulators or micro-
processor power supplies, low voltage operation and fast
transient response are required.
Pin-to-pin compatible with the LT1086 family of regulators,
GM1117 is available in surface-mount SOT-223 and TO-
252 packages.
Features
Adjustable or Fixed Output
Output Current of 1.0A
Dropout Voltage (Typical) 1.15V @ 1.0A
Line Regulation 0.2% max.
Load Regulation 0.4% max.
Fast Transient Response
Current Limit Protection
Thermal Shutdown Protection
Application
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Microprocessor Supply
Hard Drive Controllers
Battery Chargers
Adjustable Power Supply
TYPICAL APPLICATION CIRCUITS
(Adjustable Version)
VIN> 4.75V
GM1117-Adj
3 VIN
VOUT 2
+ C1
10µF
Tant
ADJ
1
(Fixed Version)
VOUT= 3.45V
VIN> 4.75V
GM1117-3.3
3 VIN
VOUT 2
R1
133W
1.0%
R2
232W
1.0%
+ C2
10µF
Tant. Min
+ C1
10µF
Tant
GND
1
VOUT= 3.3V
+ C2
10µF
Tant. Min
VOUT=
VREF
X
(1
+
R2
R1
)
+
IADJ
X
R2
Notes:
1. C1 needed if device is far from filter capacitors
2. C2 minimum value required for stability
www.gammamicro.com 1




GM1117 pdf, 반도체, 판매, 대치품
AA
MICROELECTRONICS
Power Management
GM1117
1.0A LOW DROPOUT PRECISION LINEAR REGULATORS
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Power Dissipation
Input Voltage
Lead Temperature(Soldering, 10sec)
Operating Junction Temperature Range
Control Section
Power Transistor
Storage Temperature Range
Thermal Characteristics
SOT-223
Thermal Resistance, Junction-to-Case
DPAK
Thermal Resistance, Junction-to-Case
D2PAK
Thermal Resistance, Junction-to-Case
SYMBOL
PD
VIN
TLEAD
TJ
TSTG
VALUE
Internally limited
7.0
300
0 to 125
0 to 150
-65 to + 150
UNIT
W
V
°C
°C
°C
RqJC
15
°C/ W
6.0
3.0
BLOCK DIAGRAM
(Fixed Version)
VIN
Thermal
Shutdown
Bandgap
Reference
Output
Current
Error
Limit
Amplifier
-+
VOUT
GND
(Adjustable Version)
VOUT
VIN
Thermal
Shutdown
Output
Current
Error
Limit
Amplifier
-+
Bandgap
Reference
ADJ
4

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GM1117 전자부품, 판매, 대치품
AA
MICROELECTRONICS
Power Management
GM1117
1.0A LOW DROPOUT PRECISION LINEAR REGULATORS
Protection Diodes
When large external capacitors are used with most
linear regulator, it is wise to add protection diodes. If
the input voltage of the regulator is shorted, the out-
put capacitor will discharge into the output of the reg-
ulator. The discharge current depends on the value
of capacitor, output voltage, and rate at which VIN
drops.
Figure 2 (a),(b) Protection Diode Scheme for
Large Output Capacitors
(a) Fixed Version
VIN
C1
IN4002
V VIN OUT
GM1117-3.3
GND
VOUT
C2
(b) Adjustable Version
VIN
C1
IN4002
V VIN OUT
VOUT
GM1117-Adj
ADJ R1 C2
CADJ
R2
In the GM1117 linear regulators, the discharge path
is through a large junction, and protection diodes are
normally not needed. However, damage can occur if
the regulator is used with large output capacitance
values and the input voltage is instantaneously
shorted to ground. In this case, a diode connected
as shown above in Figure 2.
Output Voltage Sensing
The GM1117 are three terminal regulators. For which,
they cannot provide true remote load sensing. Load
regulation is limited by the resistance of the conductors
connecting the regulator to the load. For best results
the GM1117 should be connected are as shown in
Figure 3.
VIN
VIN VOUT
GM1117-3.3
Conductor
RC
Parasitic
Resistance
GND
RLOAD
(a) Fixed Version
VIN VIN
VOUT
GM1117-Adj
ADJ
(b) Adjustable Version
RC
R1
R2
Conductor
Parasitic
Resistance
RLOAD
Figure 3 (a),(b) Conductor Parasitic Resistance Effects are
Minimized by this Grounding Scheme For Fixed
and Adjustable Output Regulators
Calculating Power Dissipation and Heat
Sink Requirements
The GM1117 precision linear regulators include thermal
shutdown and current limit circuitry to protect the de-
vices. However, high power regulators normally oper-
ate at high junction temperatures. It is important to cal-
culate the power dissipation and junction temperatures
accurately to be sure that you use and adequate heat
sink. The case is connected to VOUT on the GM1117,
and electrical isolation may be required for some appli-
cations. Thermal compound should always be used
with high current regulators like the GM1117.
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