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LM1577 数据表(PDF) 7 Page - Texas Instruments

部件名 LM1577
功能描述  LM1577/LM2577 SIMPLE SWITCHER짰 Step-Up Voltage Regulator
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM1577 数据表(HTML) 7 Page - Texas Instruments

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LM1577, LM2577
www.ti.com
SNOS658D – JUNE 1999 – REVISED APRIL 2013
Electrical Characteristics—LM1577-ADJ, LM2577-ADJ
Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V, VFEEDBACK = VREF, and ISWITCH = 0.
Symbol
Parameter
Conditions
Typical
LM1577-ADJ
LM2577-ADJ
Units
Limit(1)(2)
Limit(3)
(Limits)
SYSTEM PARAMETERS Circuit of Figure 31 (4)
VOUT
Output Voltage
VIN = 5V to 10V
12.0
V
ILOAD = 100 mA to 800 mA
(1)
11.60/11.40
11.60/11.40
V(min)
12.40/12.60
12.40/12.60
V(max)
ΔVOUT/ΔVIN
Line Regulation
VIN = 3.5V to 10V
20
mV
ILOAD = 300 mA
50/100
50/100
mV(max)
ΔVOUT/ΔILOA
Load Regulation
VIN = 5V
20
mV
D
ILOAD = 100 mA to 800 mA
50/100
50/100
mV(max)
η
Efficiency
VIN = 5V, ILOAD = 800 mA
80
%
DEVICE PARAMETERS
IS
Input Supply Current
VFEEDBACK = 1.5V (Switch Off)
7.5
mA
10.0/14.0
10.0/14.0
mA(max)
ISWITCH = 2.0A
25
mA
VCOMP = 2.0V (Max Duty Cycle)
50/85
50/85
mA(max)
VUV
Input Supply
ISWITCH = 100 mA
2.90
V
Undervoltage Lockout
2.70/2.65
2.70/2.65
V(min)
3.10/3.15
3.10/3.15
V(max)
fO
Oscillator Frequency
Measured at Switch Pin
52
kHz
ISWITCH = 100 mA
48/42
48/42
kHz(min)
56/62
56/62
kHz(max)
VREF
Reference
Measured at Feedback Pin
V
Voltage
VIN = 3.5V to 40V
1.230
1.214/1.206
1.214/1.206
V(min)
VCOMP = 1.0V
1.246/1.254
1.246/1.254
V(max)
ΔVREF/ΔVIN
Reference Voltage
VIN = 3.5V to 40V
0.5
mV
Line Regulation
IB
Error Amp
VCOMP = 1.0V
100
nA
Input Bias Current
300/800
300/800
nA(max)
GM
Error Amp
ICOMP = −30 μA to +30 μA
3700
μmho
Transconductance
VCOMP = 1.0V
2400/1600
2400/1600
μmho(min)
4800/5800
4800/5800
μmho(max)
AVOL
Error Amp Voltage Gain
VCOMP = 1.1V to 1.9V
800
V/V
RCOMP = 1.0 MΩ
(5)
500/250
500/250
V/V(min)
Error Amplifier
Upper Limit
2.4
V
Output Swing
VFEEDBACK = 1.0V
2.2/2.0
2.2/2.0
V(min)
Lower Limit
0.3
V
VFEEDBACK = 1.5V
0.40/0.55
0.40/0.55
V(max)
(1)
All limits ensured at room temperature (standard type face) and at temperature extremes (boldface type). All limits are used to calculate
Outgoing Quality Level, and are 100% production tested.
(2)
A military RETS electrical test specification is available on request. At the time of printing, the LM1577K-12/883, LM1577K-15/883, and
LM1577K-ADJ/883 RETS specifications complied fully with the boldface limits in these columns. The LM1577K-12/883, LM1577K-
15/883, and LM1577K-ADJ/883 may also be procured to Standard Military Drawing specifications.
(3)
All limits ensured at room temperature (standard type face) and at temperature extremes (boldface type). All room temperature limits are
100% production tested. All limits at temperature extremes are ensured via correlation using standard Statistical Quality Control (SQC)
methods.
(4)
External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the
LM1577/LM2577 is used as shown in the Test Circuit, system performance will be as specified by the system parameters.
(5)
A 1.0 M
Ω resistor is connected to the compensation pin (which is the error amplifier's output) to ensure accuracy in measuring AVOL. In
actual applications, this pin's load resistance should be
≥10 MΩ, resulting in AVOL that is typically twice the ensured minimum limit.
Copyright © 1999–2013, Texas Instruments Incorporated
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