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參數(shù)資料
| 型號(hào)： | LT1054MJ8#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 40 kHz SWITCHING FREQ-MAX, CDIP8 |
| 封裝： | 0.300 INCH, LEAD FREE, HERMETIC SEALED, CERAMIC, DIP-8 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 264K |
| 代理商： | LT1054MJ8#PBF |
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LT1054/LT1054L
5
1954lfg
TYPICAL PERFORMANCE CHARACTERISTICS
Regulated Output Voltage
Reference Voltage Temperature
Coefficient
TEMPERATURE (°C)
–50
–12.6
OUTPUT
VOLTAGE
(V)
–12.4
–12.0
–11.8
–11.6
–4.7
–5.0
0
50
75
LT1054 TPC09
–12.2
–4.9
–4.8
–5.1
–25
25
100 125
TEMPERATURE (°C)
–50
–100
REFERENCE
VOLTAGE
CHANGE
(mV)
–80
–40
–20
0
100
40
0
50
75
LT1054 TPC10
–60
60
80
20
–25
25
100 125
VREF AT 0 = 2.500V
PIN FUNCTIONS
FB/SHDN (Pin 1): Feedback/Shutdown Pin. This pin has
two functions. Pulling Pin 1 below the shutdown threshold
(≈0.45V) puts the device into shutdown. In shutdown the
reference/regulator is turned off and switching stops. The
switchesaresetsuchthatbothCINandCOUTaredischarged
through the output load. Quiescent current in shutdown
drops to approximately 100A (see Typical Performance
Characteristics). Any open-collector gate can be used to
put the LT1054 into shutdown. For normal (unregulated)
operation the device will start back up when the external
gate is shut off. In LT1054 circuits that use the regulation
feature, the external resistor divider can provide enough
pull-down to keep the device in shutdown until the output
capacitor (COUT) has fully discharged. For most applica-
tions where the LT1054 would be run intermittently, this
does not present a problem because the discharge time
of the output capacitor will be short compared to the off-
time of the device. In applications where the device has
to start up before the output capacitor (COUT) has fully
discharged, a restart pulse must be applied to Pin 1 of
the LT1054. Using the circuit of Figure 5, the restart signal
can be either a pulse (tp > 100s) or a logic high. Diode
coupling the restart signal into Pin 1 will allow the output
voltage to come up and regulate without overshoot. The
resistor divider R3/R4 in Figure 5 should be chosen to
provide a signal level at pin 1 of 0.7V to 1.1V.
Pin 1 is also the inverting input of the LT1054’s error
amplifier and as such can be used to obtain a regulated
output voltage.
CAP+/CAP– (Pin 2/Pin 4): Pin 2, the positive side of the
input capacitor (CIN), is alternately driven between V+
and ground. When driven to V+, Pin 2 sources current
from V+. When driven to ground Pin 2 sinks current to
ground. Pin 4, the negative side of the input capacitor, is
driven alternately between ground and VOUT. When driven
to ground, Pin 4 sinks current to ground. When driven to
VOUT Pin 4 sources current from COUT. In all cases current
flowintheswitchesisunidirectionalasshouldbeexpected
using bipolar switches.
VOUT (Pin 5): In addition to being the output pin this pin
is also tied to the substrate of the device. Special care
must be taken in LT1054 circuits to avoid pulling this
pin positive with respect to any of the other pins. Pulling
Pin5 positive with respect to Pin 3 (GND) will forward
bias the substrate diode which will prevent the device from
starting. This condition can occur when the output load
driven by the LT1054 is referred to its positive supply (or
to some other positive voltage). Note that most op amps
present just such a load since their supply currents flow
from their V+ terminals to their V– terminals. To prevent
start-up problems with this type of load an external
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