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PDF LM2594HV Data sheet ( Hoja de datos )

Número de pieza LM2594HV
Descripción SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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December 1999
LM2594/LM2594HV
SIMPLE SWITCHER® Power Converter 150 kHz 0.5A
Step-Down Voltage Regulator
General Description
The LM2594/LM2594HV series of regulators are monolithic
integrated circuits that provide all the active functions for a
step-down (buck) switching regulator, capable of driving a
0.5A load with excellent line and load regulation. These de-
vices are available in fixed output voltages of 3.3V, 5V, 12V,
and an adjustable output version, and are packaged in a
8-lead DIP and a 8-lead surface mount package.
Requiring a minimum number of external components, these
regulators are simple to use and feature internal frequency
compensation, a fixed-frequency oscillator, and improved
line and load regulation specifications.
The LM2594/LM2594HV series operates at a switching fre-
quency of 150 kHz thus allowing smaller sized filter compo-
nents than what would be needed with lower frequency
switching regulators. Because of its high efficiency, the cop-
per traces on the printed circuit board are normally the only
heat sinking needed.
A standard series of inductors (both through hole and sur-
face mount types) are available from several different manu-
facturers optimized for use with the LM2594/LM2594HV se-
ries. This feature greatly simplifies the design of
switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on out-
put voltage under all conditions of input voltage and output
load conditions, and ±15% on the oscillator frequency. Ex-
ternal shutdown is included, featuring typically 85 µA
standby current. Self protection features include a two stage
frequency reducing current limit for the output switch and an
over temperature shutdown for complete protection under
fault conditions.
The LM2594HV is for applications requiring an input voltage
up to 60V.
Features
n 3.3V, 5V, 12V, and adjustable output versions
n Adjustable version output voltage range, 1.2V to 37V
(57V for the HV version)±4% max over line and load
conditions
n Available in 8-pin surface mount and DIP-8 package
n Guaranteed 0.5A output current
n Input voltage range up to 60V
n Requires only 4 external components
n 150 kHz fixed frequency internal oscillator
n TTL Shutdown capability
n Low power standby mode, IQ typically 85 µA
n High Efficiency
n Uses readily available standard inductors
n Thermal shutdown and current limit protection
Applications
n Simple high-efficiency step-down (buck) regulator
n Efficient pre-regulator for linear regulators
n On-card switching regulators
n Positive to Negative convertor
Typical Application (Fixed Output Voltage Versions)
DS012439-1
SIMPLE SWITCHER and Switchers Made Simpleare registered trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS012439
www.national.com

1 page




LM2594HV pdf
All Output Voltage Versions
Electrical Characteristics (Continued)
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Note 3: Typical numbers are at 25˚C and represent the most likely norm.
Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% produc-
tion tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate
Average Outgoing Quality Level (AOQL).
Note 5: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator sys-
tem performance. When the LM2594/LM2594HV is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section
of Electrical Characteristics.
Note 6: The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current over-
load.
Note 7: No diode, inductor or capacitor connected to output pin.
Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 9: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor
switch OFF.
Note 10: VIN = 40V for the LM2594 and 60V for the LM2594HV.
Note 11: Junction to ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional copper area will
lower thermal resistance further. See application hints in this data sheet and the thermal model in Switchers Made Simple® software.
Typical Performance Characteristics
Normalized
Output Voltage
Line Regulation
Efficiency
Switch Saturation
Voltage
DS012439-4
DS012439-5
Switch Current Limit
Dropout Voltage
DS012439-6
DS012439-7
DS012439-8
DS012439-9
5 www.national.com

5 Page





LM2594HV arduino
LM2594/LM2594HV Series Buck Regulator Design Procedure (Fixed
Output) (Continued)
Conditions
Output
Voltage
(V)
3.3
5
12
Load
Current
(A)
0.5
0.2
0.5
0.2
0.5
0.2
Max Input
Voltage
(V)
5
7
10
40
6
10
40
8
10
15
40
9
20
40
15
18
30
40
15
20
40
Inductor
Inductance Inductor
(µH)
(#)
33 L14
47 L13
68 L21
100 L20
68 L4
150 L10
220 L9
47 L13
68 L21
100 L20
150 L19
150 L10
220 L9
330 L8
68 L21
150 L19
220 L27
330 L26
100 L11
220 L9
330 L17
Output Capacitor
Through Hole
Surface Mount
Panasonic Nichicon AVX TPS
Sprague
HFQ Series PL Series
Series
595D Series
(µF/V)
(µF/V)
(µF/V)
(µF/V)
220/16
220/16
100/16
100/6.3
120/25
120/25
100/16
100/6.3
120/25
120/25
100/16
100/6.3
120/35
120/35
100/16
100/6.3
120/25
120/25
100/16
100/6.3
120/16
120/16
100/16
100/6.3
120/16
120/16
100/16
100/6.3
180/16
180/16
100/16
33/25
180/16
180/16
100/16
33/25
120/25
120/25
100/16
33/25
120/25
120/25
100/16
33/25
82/16
82/16
100/16
33/25
120/16
120/16
100/16
33/25
120/16
120/16
100/16
33/25
82/25
82/25
100/16
15/25
82/25
82/25
100/16
15/25
82/25
82/25
100/16
15/25
82/25
82/25
100/16
15/25
82/25
82/25
100/16
15/25
82/25
82/25
100/16
15/25
82/25
82/25
100/16
15/25
FIGURE 2. LM2594/LM2594HV Fixed Voltage Quick Design Component Selection Table
LM2594/LM2594HV Series Buck Regulator Design Procedure (Adjustable
Output)
PROCEDURE (Adjustable Output Voltage Version)
Given:
VOUT = Regulated Output Voltage
VIN(max) = Maximum Input Voltage
ILOAD(max) = Maximum Load Current
F = Switching Frequency (Fixed at a nominal 150 kHz).
EXAMPLE (Adjustable Output Voltage Version)
Given:
VOUT = 20V
VIN(max) = 28V
ILOAD(max) = 0.5A
F = Switching Frequency (Fixed at a nominal 150 kHz).
11 www.national.com

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