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LM2595T-3.3/NOPB Datasheet(PDF) 6 Page - Texas Instruments

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No. de pieza LM2595T-3.3/NOPB
Descripción Electrónicos  SIMPLE SWITCHER Power Converter 150-kHz 1-A Step-Down Voltage Regulator
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM2595T-3.3/NOPB Datasheet(HTML) 6 Page - Texas Instruments

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6
LM2595
SNVS122C – MAY 1999 – REVISED MAY 2016
www.ti.com
Product Folder Links: LM2595
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
(1)
All limits specified at room temperature and 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).
(2)
Typical numbers are at 25°C and represent the most likely norm.
(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 LM2595 is used as shown in the Figure 35 test circuit, system performance is shown
in the test conditions column.
7.8 Electrical Characteristics – Adjustable
Specifications are for TJ = 25°C (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN(1)
TYP(2)
MAX(1)
UNIT
SYSTEM PARAMETERS(3) (see Figure 35 for test circuit)
VFB
Feedback voltage
4.5 V
≤ VIN ≤ 40 V, 0.1 A ≤ ILOAD ≤ 1 A
1.23
V
VOUT programmed for 3 V,
circuit of Figure 35
TJ = 25°C
1.193
1.267
Over full operating temperature range
1.18
1.28
η
Efficiency
VIN = 12 V, VOUT = 3 V, ILOAD = 1 A
78%
(1)
All limits specified at room temperature and 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).
(2)
Typical numbers are at 25°C and represent the most likely norm.
(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 adjustable versions, and 15 V for the 12-V version, to
force the output transistor switch OFF.
(7)
VIN = 40 V.
7.9 Electrical Characteristics – All Output Voltage Versions
Specifications are for TJ = 25°C, ILOAD = 200 mA, VIN = 12 V for the 3.3-V, 5-V, and adjustable versions, and VIN = 24 V for the
12-V version (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN(1)
TYP(2)
MAX(1)
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(3)
TJ = 25°C
127
150
173
kHz
Over full operating temperature range
110
173
VSAT
Saturation voltage
IOUT = 1 A, TJ = 25°C
(4) (5)
1
1.2
V
Over full operating temperature range
1.3
DC
Max duty cycle (ON)(5)
100%
Min duty cycle (OFF)(6)
0%
ICL
Current limit
Peak current(4)(5)
TJ = 25°C
1.2
1.5
2.4
A
Over full operating
temperature range
1.15
2.6
IL
Output leakage current
Output = 0 V(4)(6)(7)
50
μA
Output =
−1 V
2
15
mA
IQ
Quiescent current(6)
5
10
mA
ISTBY
Standby quiescent current
ON/OFF pin = 5 V (OFF)(7)
TJ = 25°C
85
200
μA
Over full operating
temperature range
250
ON/OFF CONTROL (see Figure 35 for test circuit)
ON/OFF pin logic input
1.3
V
VIH
Threshold voltage, high
Regulator ON, over full operating temperature range
0.6
V
VIL
Threshold voltage, low
Regulator OFF, over full operating temperature range
2
V
IH
ON/OFF pin input current, high
VLOGIC = 2.5 V (regulator OFF)
5
15
μA
IL
ON/OFF pin input current, low
VLOGIC = 0.5 V (regulator ON)
0.02
5
μA


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