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LM2594M-5.0 数据表(PDF) 6 Page - Texas Instruments

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部件名 LM2594M-5.0
功能描述  SIMPLE SWITCHER Power Converter 150-kHz 0.5-A Step-Down Voltage Regulator
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM2594M-5.0 数据表(HTML) 6 Page - Texas Instruments

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LM2594, LM2594HV
SNVS118D – DECEMBER 1999 – REVISED MAY 2016
www.ti.com
Product Folder Links: LM2594 LM2594HV
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
(1)
Typical numbers are at 25°C and represent the most likely norm.
(2)
All limits ensured at room temperature and at temperature extremes. All room temperature limits are 100% production tested. All limits at
temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to
calculate Average Outgoing Quality Level (AOQL).
(3)
External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance. When the LM2594/LM2594HV is used as shown in the Figure 35 test circuit, system
performance is as shown in the system parameters.
7.8 Electrical Characteristics – Adjustable
Specifications are for TJ = 25°C (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP(1)
MAX(2)
UNIT
SYSTEM PARAMETERS(3) (see Figure 35 for test circuit)
VFB
Feedback voltage
4.5 V
≤ VIN ≤ VINmax,
0.1 A
≤ ILOAD ≤ 0.5 A,
VOUT programmed for 3 V,
Circuit of Figure 35
TJ = 25°C
1.193
1.23
1.267
V
Over full operating temperature range
1.18
1.28
η
Efficiency
VIN = 12 V, ILOAD = 0.5 A
80%
(1)
Typical numbers are at 25°C and represent the most likely norm.
(2)
All limits ensured at room temperature and at temperature extremes. All room temperature limits are 100% production tested. All limits at
temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to
calculate Average Outgoing Quality Level (AOQL).
(3)
The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the
severity of current overload.
(4)
No diode, inductor or capacitor connected to output pin.
(5)
Feedback pin removed from output and connected to 0 V to force the output transistor switch ON.
(6)
Feedback pin removed from output and connected to 12 V for the 3.3-V, 5-V, and the adjustable version, and 15 V for the 12-V version,
to force the output transistor switch OFF.
(7)
VIN = 40 V for the LM2594 and 60 V for the LM2594HV.
7.9 Electrical Characteristics – All Output Voltage Versions
Specifications are for TJ = 25°C, VIN = 12 V for the 3.3-V, 5-V, and adjustable version, and VIN = 24 V for the 12-V version,
ILOAD = 100 mA (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP(1)
MAX(2)
UNIT
DEVICE PARAMETERS
Ib
Feedback bias current
Adjustable version only, VFB =
1.3 V
TJ = 25°C
10
50
nA
Over full operating temperature range
100
fO
Oscillator frequency
See(3)
TJ = 25°C
127
150
173
kHz
Over full operating temperature range
110
173
VSAT
Saturation voltage
IOUT = 0.5 A
(4) (5)
TJ = 25°C
0.9
1.1
V
Over full operating temperature range
1.2
DC
Max duty cycle (ON)
See(5)
100%
Min duty cycle (OFF)
See(6)
0%
ICL
Current limit
Peak current(4)(5)
TJ = 25°C
0.65
0.8
1.3
A
over full operating temperature range
0.58
1.4
IL
Output leakage current
Output = 0 V(4)(6)(7)
Output =
−1 V
50
μA
2
15
mA
IQ
Quiescent current
See(6)
5
10
mA
ISTBY
Standby quiescent
current
ON/OFF pin = 5 V (OFF)(7)
85
μA
LM2594
TJ = 25°C
200
μA
Over full operating temperature range
250
LM2594HV
TJ = 25°C
140
250
μA
Over full operating temperature range
300
ON/OFF CONTROL (see Figure 35 for test circuit)
ON/OFF pin logic input
1.3
V
VIH
Threshold voltage
Low (regulator ON), over full operating temperature range
0.6
V
VIL
High (regulator OFF), over full operating temperature range
2
V
IH
ON/OFF pin input
current
VLOGIC = 2.5 V (regulator OFF)
5
15
μA
IL
VLOGIC = 0.5 V (regulator ON)
0.02
5
μA


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