LR2596 [LRC]
150KHz, 3A PWM Buck DC/DC Converter TTL shutdown capability; 为150KHz ， 3A PWM降压型DC / DC转换器TTL关断能力
| 型号： | LR2596 |
| 厂家： | 
LESHAN RADIO COMPANY |
| 描述： | 150KHz, 3A PWM Buck DC/DC Converter TTL shutdown capability |
| 文件： | 总7页 (文件大小：154K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LESHAN RADIO COMPANY, LTD.
LR2596 Series
LR2596
150KHz, 3A PWM Buck DC/DC Converter
Description
The LR2596 is Monolithic IC that design for a step-down DC/DC Converter, and own
the ability of driving a 3A load without additional transistor component. The output
version included 3.3V, 5V, 12V and an adjustable type. It operates at a switching
frequency of 150KHz thus allowing smaller sized filter components than what would
be needed with lower frequency switching regulators. Other features include a
guaranteed ±4% tolerance on output voltage under specified input voltage and
output load conditions, and ±15% on the oscillator frequency. Regarding protected
function, thermal shutdown is to prevent over temperature operating from damage,
and current limit is against over current operating of the output switch.
Features
• 3.3V, 5V, 12V and adjustable
• Adjustable version output voltage range: 1.4-37V
• ±4% max over line and load conditions
• 150KHz ±15% fixed switching frequency
• TTL shutdown capability
1 2 3 4 5
• Operating voltage can be up to 40V
• Output load current: 3A
• TO220-5L and TO263-5L packages
• Low power standby mode
• Thermal-shuntdown and current-limit protection
• High efficiency
• Built-in switching a transistor on chip, requires only 4 external components
Applications
• Simple High-efficiency step-down regulator
• Positive to negative converter
• On-card switching regulators
Connection Diagrams
TO220-5L
Pins 1,3,5
TO263-5L
Pins 2,4
Side
View
Side
View
5 - On/Off
4 - Feed Back
3 - Ground
2 - Output
1 - VIN
5 - On/Off
4 - Feed Back
3 - Ground
2 - Output
1 - VIN
Top
View
Top
View
Metal Tab GND
Metal Tab GND
1/7
LESHAN RADIO COMPANY, LTD.
LR2596
Pin Connections
SD
VIN
+
+
Current
Source
Bias
1.235V
Reference
2.5V
Regulator
Start
Up
200mV
220mV
R
+
COMP
-
Current
Limit
-
FB
COMP
+
-
+
R2
AMP
-
3A
Switch
COMP
Driver
+
+
Output
GND
R1=2.5K
150KHz
OSC.
Thermal
Limit
COMP
-
(Note1)
Absolute Maxium Rating
Parameter
Supply Voltage
Symbol
VCC
VSD
Value
40
Unit
V
On/Off Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
-0.3~+25
-0.3~+25
-1
V
VFB
V
VOUT
PD
V
Internally Limited
-40~+125
W
oC
oC
V
Operating Temperature
Storage Temperature
Operating Voltage
Topr
Tstg
-65~+150
VOP
+4.5~+40
Electrical Characteristics (Continued)
Specifications with boldface type apply over for full operating temperature range, the other type are for TJ=25oC(Note 2)
Typ.
(Note3) (Note4)
Max.
Part No.
Parameter
Symbol
Conditions
Min.
Unit
3.168
3.135
3.342
3.3
Output Voltage
Efficiency
VOUT
η
V
%
V
4.75V≤VIN≤40V, 0.2A≤ILOAD≤3A
VIN=12V, ILOAD=3A
3.465
LR2596-3.3
-
73
5.0
-
4.800
4.750
5.200
5.250
Output Voltage
Efficiency
VOUT
η
7V≤VIN≤40V, 0.2A≤ILOAD≤3A
VIN=12V, ILOAD=3A
LR2596-5.0
LR2596-12
LR2596-ADJ
-
80
-
%
V
11.52
11.40
12.48
12.60
Output Voltage
Efficiency
VOUT
η
12.0
90
15V≤VIN≤40V, 0.2A≤ILOAD≤3A
VIN=25V, ILOAD=3A
-
-
%
V
1.261
1.248
1.339
1.352
4.5V≤VIN≤40V, 0.2A≤ILOAD≤3A
VOUT programmed for 3V
Output Voltage
Efficiency
VOUT
η
1.300
73
VIN=12V, VOUT=3V, ILOAD=3A
-
-
%
2/7
LESHAN RADIO COMPANY, LTD.
LR2596
All Output Voltage Versions Electrical Characteristics
Specifications with boldface type apply over for full operating temperature range, the other type are for TJ=25oC
(Unless otherwise specified, VIN=12V for the 3.3V, 5V, and adjustable version and VIN=24V for the 12V version, ILOAD=500mA)
Parameter
Device Parameters
Symbol
Test Condition
Min.
-
Typ.
Max.
Unit
50
100
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Ib
fO
Adjustable Version Only, VFB=1.3V
10
150
1.3
nA
KHz
V
127
110
173
173
(Note 5)
1.4
1.5
VSAT
DC
ICL
IOUT=3A (Note 6,7)
-
-
(Note 7)
(Note 8)
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
100
0
-
%
5.5
6.5
Current Limit
Peak Current (Note 6,7)
3.6
4.5
A
Output Leakage Current
Quiescent Current
IL
Output=0V (Note 6,8)
(Note 8)
-
-
-
50
10
uA
IQ
5
mA
250
300
Standby Quiescent Current
ISTBY
ON/OFF pin=5V (Note 9)
-
150
uA
TO220-5L
TO263-5L
TO220-5L
TO263-5L
-
-
-
-
2.5
3.5
28
-
-
-
-
Junction to
Case
oC/W
θJC
Thermal Resistance
Junction to
ambient
oC/W
(Note 10)
θJA
23
ON/OFF Control
VIH
Low (Regulator ON)
-
0.6
ON/OFF Pin Logic Input Threshold
Voltage
1.3
V
VIL
IIH
IIL
High (Regulator OFF)
2.0
-
VLOGIC=2.5V (Regulator OFF)
VLOGIC=0.5V (Regulator ON)
-
-
5
15
5
ON/OFF Pin Input Current
uA
0.02
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which
the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions,
see the Electrical Characteristics.
Note 2: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance.
Note 3: Typical numbers are at 25oC 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% production 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: The switching frequency is reduced when the second stage current limit is activated.
Note 6: No diode, inductor or capacitor connected to output pin.
Note 7: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 8: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, ADJ. version, and 15V for the 12V version, to force the output
transistor switch OFF.
Note 9: VIN=40V.
Note 10: Junction to ambient thermal resistance. (With copper area of approximately 3in2)
3/7
LESHAN RADIO COMPANY, LTD.
LR2596
Characteristics Curve
Normalized Output Voltage
Shutdown Quiescent Current
160
140
120
100
80
1.5
V
IN=12V
1
=200mA
ILOAD
0.5
0
VON/VOFF=5V
TJ=25oC
60
-0.5
-1
40
20
-1.5
0
0
25
50
75
100
125
150
175
0
10
20
30
40
Junction Temperature (oC)
Supply Voltage (V)
Switch Current Limit
Switch Saturation Voltage
6.00
5.90
5.80
5.70
5.60
5.50
5.40
5.30
5.20
1.30
1.20
1.10
1.00
0.90
0.80
V
IN=12V
TJ=25oC
V
IN=12V
VOUT=5V
0
1
2
3
4
0
25
50
75
100
125
150
Junction Temperature (oC)
Switch Current (A)
On/Off Pin Current (Sinking)
12
10
8
VIN=40V
TJ=25oC
6
4
2
0
0
5
10
15
20
25
30
On/Off Pin Voltage (V)
4/7
LESHAN RADIO COMPANY, LTD.
LR2596
Typical Application Circuit
Fig.1 Fixed Type Circuit
4
Feedback
+
1
2
D
LR2596
Fix Output
Input
Output
L1
33uH
L
3
GND
5
ON/OFF
Unregulated
DC Input
O
A
D
C1
680uF
D1
1N5825
C2
220uF
Fig.2 Adjustable Output Voltage Versions
R1
R2
1K
4
LR2596
+
1
2
Adjustable Output
Input
Output
L1
47uH
L
O
A
D
3
5
Unregulated
DC Input
C1
680uF
D1
1N5825
C2
220uF
5/7
LESHAN RADIO COMPANY, LTD.
LR2596
TO-263-5L Dimension
DIM
A
B
C
D
E
Min.
9.9
-
15.20
-
Max.
10.30
#7.10
15.60
*1.70
4.70
*1.27
8.60
0.25
5.50
2.64
#7.00
#4.48
7O
Marking:
A
B
E
Product Series
Pb Free Mark
F
K
D
U
.
"
ADJ,3.3,5.0,
Pb-Free: "
2 5 9 6 -
4.50
-
Normal: None
Date Code
F
Control Code
L
G
H
I
J
K
8.20
0.05
5.10
2.44
-
G
Note: Green label is used for pb-free packing
H
I
C
Pin Style: 1.Vin 2.Output 3.Ground 4.Feed Back
5.On/Off
1
2
3
4
5
Material:
L
a1
-
• Lead solder plating: Sn60/Pb40 (Normal),
Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free)
• Mold Compound: Epoxy resin family,
flammability solid burning class: UL94V-0
J
0O
D
#: REF, *: Typical, Unit: mm
a1
5-Lead TO-263
Plastic Package
DBMI Package Code: U
TO-220-5L Dimension
DIM
A
B
C
D
E
Min.
10.10
2.55
3.20
7.90
12.50
22.30
3.20
0.70
6.60
4.40
1.17
17.00
16.00
17.00
2.30
3.30
0.28
7.62
22.90
1.85
1.20
2.80
4.5o
Max.
10.50
2.95
3.60
8.30
12.90
22.70
3.60
0.90
7.00
4.80
1.37
18.00
16.40
19.00
2.70
4.10
0.48
8.02
23.30
1.95
1.30
3.20
5.5o
Marking:
Pb Free Mark
Product Series
J
A
.
ADJ,3.3,5.0,12
Pb-Free: "
"
E
D
r1
K
B
2 5 9 6 -
Normal:
F
C
Date Code
Control Code
G
H
I
J
K
Note: Green label is used for pb-free packing
D
E
a1
a1
Pin Style: 1.Vin 2.Output 3.Ground 4.Feed Back
5.On/Off
M
L
N
a1
L
Material:
r2
F
S
M
N
O
P
Q
R
S
r1
r2
r3
a1
• Lead solder plating: Sn60/Pb40 (Normal),
Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free)
• Mold Compound: Epoxy resin family,
flammability solid burning class: UL94V-0
O
r3
r3
Q
r3
5-Lead TO-220
Plastic Package
DBMI Package Code: E
G
I
H
P
R
*: Typical, Unit: mm
6/7
LESHAN RADIO COMPANY, LTD.
LR2596
Soldering Methods for DBMI’s Products
1. Storage environment: Temperature=10oC~35oC Humidity=65%±15%
2. Reflow soldering of surface-mount devices
Figure 1: Temperature profile
t
P
Critical Zone
TP
L
P
T to T
Ramp-up
T
L
tL
Tsmax
Tsmin
t
S
Preheat
Ramp-down
25
t 25oC to Peak
Time
Profile Feature
Average ramp-up rate (TL to TP)
Preheat
Sn-Pb Eutectic Assembly
<3oC/sec
Pb-Free Assembly
<3oC/sec
- Temperature Min (Tsmin
)
100oC
150oC
150oC
200oC
- Temperature Max (Tsmax
- Time (min to max) (ts)
Tsmax to TL
)
60~120 sec
60~180 sec
- Ramp-up Rate
<3oC/sec
<3oC/sec
Time maintained above:
- Temperature (TL)
- Time (tL)
183oC
217oC
60~150 sec
240oC +0/-5oC
60~150 sec
260oC +0/-5oC
Peak Temperature (TP)
Time within 5oC of actual Peak
10~30 sec
20~40 sec
Temperature (tP)
Ramp-down Rate
<6oC/sec
<6oC/sec
Time 25oC to Peak Temperature
<6 minutes
<8 minutes
3. Flow (wave) soldering (solder dipping)
Products
Pb devices.
Peak temperature
245oC ±5oC
260oC +0/-5oC
Dipping time
5sec ±1sec
5sec ±1sec
Pb-Free devices.
7/7
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