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L6932D25 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 L6932D25은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 L6932D25 기능
기능 HIGH PERFORMANCE 2A ULDO LINEAR REGULATOR
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L6932D25 데이터시트, 핀배열, 회로
L6932
HIGH PERFORMANCE 2A ULDO LINEAR REGULATOR
s 2V TO 14V INPUT VOLTAGE RANGE
s 200mRdson MAX.
s 200µA QUIESCENT CURRENT AT ANY LOAD
s EXCELLENT LOAD AND LINE REGULATION
s 1.8V AND 2.5V FIXED VOLTAGE
s ADJUSTABLE FROM 1.2V TO 5V (L6932D1.2)
s 1% VOLTAGE REGULATION ACCURACY
s SHORT CIRCUIT PROTECTION
s THERMAL SHUT DOWN
s SO-8 (4+4) PACKAGE
SO-8 (4+4)
ORDERING NUMBERS:
L6932D1.2 (SO-8) L6932D1.2TR (T&R)
L6932D1.8 (SO-8) L6932D1.8TR (T&R)
L6932D2.5 (SO-8) L6932D2.5TR (T&R)
APPLICATIONS
s MOTHERBOARDS
s MOBILE PC
s HAND-HELD INSTRUMENTS
s PCMCIA CARDS
s PROCESSORS I/O
s CHIPSET AND RAM SUPPLY
DESCRIPTION
The L6932 Ultra Low Drop Output linear regulator op-
erates from 2V to 14V and is able to support 2A. De-
signed with an internal 50mN-channel
Mosfet, can be usefull for the DC-DC conversion be-
tween 2.5V and 1.8V at 2A in portable applications
reducing the power dissipation.
L6932 is available in 1.8V, 2.5V and adj version from
1.2V and ensure a voltage regulation accuracy of
1%.
The current limit is fixed at 2.5A to control the current
in short circuit condition within ±8%. The current is
sensed in the power mos in order to limit the power
dissipation.
The device is also provided of a thermal shut down
that limits the internal temperature at 150°C with an
histeresys of 20°C. L6932 provides the Enable and
the Power good functions.
TYPICAL OPERATING CIRCUIT
VIN
2V to 14V
IN
2
OUT
3
L6932D
PGOOD
4
C1
5,6,7,8
1
GND
EN
VOUT
1.8V or 2.5V
C2
February 2003
VIN
2V to 14V
IN
2
OUT
4
L6932D1.2
ADJ
3
C1
5,6,7,8
1
GND
EN
R1
R2
VOUT
1.2V to 5V
C2
1/10




L6932D25 pdf, 반도체, 판매, 대치품
L6932
ELECTRICAL CHARACTERISTCS (continued)
Symbol
Parameter
Pgood threshold
Pgood Hysteresis
Pgood saturation
Vo rise
Test Condition
Ipgood =1mA
Min.
Typ.
90
10
0.2
Max.
0.4
Unit
%Vo
%Vo
V
Figure 1. Output Voltage vs. Junction
Temperature (L6932D1.2)
1.213
1.212
1.212
1.211
V
1.211
1.210
1.210
1.209
-60 -40 -20 0 20 40 60 80 100 120 140 160
Temp [°C]
Figure 4. Quiescent Current vs. Junction
Temperature
310
300
Vin=5V
290
Iq 280
(uA)
270
260
250
-40 -20
0 20 40 60 80 100 120 140
Temp [°C ]
Figure 2. Output Voltage vs. Junction
Temperature (L6932D1.8)
1.808
1.804
1.800
V
1.796
1.792
1.788
-60 -40 -20 0
20 40 60 80 100 120 140 160
Temp [°C]
Figure 3. Output Voltage vs. Junction
Temperature (L6932D2.5)
2.520
Figure 5. Shutdown Current vs. Junction
Temperature
7.5
7
6.5
Ishdn 6
(uA)
5.5
Vin=5V
5
4.5
4
-40
-20
0
20 40 60
Temp [°C ]
80 100 120 140
2.515
2.510
V
2.505
2.500
2.495
-60 -40 -20 0
20 40 60 80 100 120 140 160
Temp [°C]
4/10

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L6932D25 전자부품, 판매, 대치품
L6932
Loop Stability
The stability of the loop is affected by the zero introduced by the output capacitor.
The time constant of the zero is given by:
T = ESR COUT
FZERO
=
---------------------1-----------------------
2π ⋅ ESR COUT
This zero helps to increase the phase margin of the loop until the time constant is higher than some hundreds
of nsec, depending also on the output voltage and current.
So, using very low ESR ceramic capacitors could produce oscillations at the output, in particular when regulating
high output voltages (adjustable version).
To solve this issue is sufficient to add a small capacitor (e.g. 1nF to 10nF) in parallel to the high side resistor of
the external divider, as shown in figure 9.
Figure 9. Compensation Network
VIN=2V TO 14V
C1
IN
2
OUT
4
L6932D1.2
R1
EN
1
5
ADJ
3
6 78
GND
R2
VOUT=1.2V TO 5V UP to 2A
C3
C2
Thermal Considerations
Since the device is housed in a small SO(4+2+2) package the thermal issue can be the bottleneck of many ap-
plications. The power dissipated by the device is given by:
PDISS = (VIN - VOUT) · IOUT
The thermal resistance junction to ambient of the demoboard is approximately 62°C/W. This mean that, consid-
ering an ambient temperature of 60°C and a maximum junction temperature of 150°C, the maximum power that
the device can handle is 1.5W.
This means that the device is able to deliver a DC output current of 2A only with a very low dropout.
In many applications, high output current pulses are required. If their duration is shorter than the thermal con-
stant time of the board, the thermal impedance (not the thermal resistance) has to be considered.
In figure 10 the thermal impedance versus the duration of the current pulse for the SO(4+2+2) mounted on board
is shown.
7/10

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