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부품번호 | LM5010MHX 기능 |
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기능 | High Voltage 1A Step Down Switching Regulator | ||
제조업체 | National Semiconductor | ||
로고 | |||
전체 19 페이지수
October 2004
LM5010
High Voltage 1A Step Down Switching Regulator
General Description
The LM5010 Step Down Switching Regulator features all the
functions needed to implement a low cost, efficient, buck
bias regulator capable of supplying in excess of 1A load
current. This high voltage regulator contains an N-Channel
Buck Switch, and is available in thermally enhanced LLP-10
and TSSOP-14EP packages. The hysteretic regulation
scheme requires no loop compensation, results in fast load
transient response, and simplifies circuit implementation.
The operating frequency remains constant with line and load
variations due to the inverse relationship between the input
voltage and the on-time. The valley current limit detection is
set at 1.25A. Additional features include: VCC under-voltage
lockout, thermal shutdown, gate drive under-voltage lockout,
and maximum duty cycle limiter.
Features
n Input Voltage Range: 8V to 75V
n Valley Current Limit At 1.25A
n Switching Frequency Can Exceed 1 MHz
n Integrated N-Channel Buck Switch
n Integrated Startup Regulator
n No Loop Compensation Required
n Ultra-Fast Transient Response
n Operating Frequency Remains Constant With Load and
Line Variations
n Maximum Duty Cycle Limited During Startup
n Adjustable Output Voltage
n Precision 2.5V Feedback Reference
n Thermal shutdown
Typical Applications
n High Efficiency Point-Of-Load (POL) Regulator
n Non-Isolated Telecommunications Buck Regulator
n Secondary High Voltage Post Regulator
n Automotive Systems
Package
n LLP-10 (4 mm x 4 mm)
n TSSOP-14EP
n Both Packages Have Exposed Thermal Pad For
Improved Heat Dissipation
Basic Stepdown Regulator
20119943
© 2004 National Semiconductor Corporation DS201199
www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND
BST to GND
SW to GND (Steady State)
BST to VCC
BST to SW
VCC to GND
SGND to RTN
SS to RTN
76V
90V
-1.5V
76V
14V
14V
-0.3V to +0.3V
-0.3V to 4V
VIN to SW
Current Out of ISEN
All Other Inputs to GND
76V
See Text
-0.3 to 7V
ESD Rating (Note 2)
Human Body Model
2kV
Storage Temperature Range
-55˚C to +150˚C
Lead Temperature (Soldering 4 sec) (Note 4)
260˚C
Operating Ratings (Note 1)
VIN
Operating Junction Temperature
8V to 75V
−40˚C to + 125˚C
Electrical Charateristics
Specifications with standard typeface are for TJ = 25˚C, and those with boldface type apply over full Operating Junction
Temperature range. VIN = 48V, RON = 200kΩ, unless otherwise stated (Note 5) and (Note 6).
Symbol
Parameter
Conditions
Min Typ Max
Units
VCC Regulator
VCCReg
VCC regulated output
VIN - VCC
UVLOVCC
VCC output impedance
(0 mA ≤ ICC ≤ 5 mA)
VCC current limit (Note 3)
VCC under-voltage lockout
threshold
ICC = 0 mA, FS < 200 kHz
7.5V ≤ VIN ≤ 8.0V
VIN = 8.0V
VIN = 48V
VCC = 0V
VCC increasing
6.6
7
1.3
140
2.5
10
5.8
7.4
Volts
V
Ω
mA
V
UVLOVCC hysteresis
UVLOVCC filter delay
IIN operating current
IIN shutdown current
Switch Characteristics
VCC decreasing
100 mV overdrive
Non-switching, FB = 3V
RON/SD = 0V
145
3
650 850
95 200
mV
µs
µA
µA
Rds(on)
UVLOGD
Softstart Pin
Buck Switch Rds(on)
Gate Drive UVLO
UVLOGD hysteresis
ITEST = 200 mA
VBST - VSW Increasing
0.35
0.80
3.0 4.3
5.0
440
Ω
V
mV
Pull-up voltage
2.5 V
Internal current source
11.5
µA
Current Limit
ILIM Threshold
Current out of ISEN
1 1.25 1.5
A
Resistance from ISEN to SGND
130 mΩ
Response time
150 ns
On Timer, RON/SD Pin
tON - 1
On-time
tON - 2
On-time
Shutdown threshold
Threshold hysteresis
Off Timer
VIN = 10V, RON = 200 kΩ
VIN = 75V, RON = 200 kΩ
Voltage at RON/SD rising
Voltage at RON/SD falling
2.1
290
0.35
2.75
390
0.65
40
3.4
490
1.1
µs
ns
V
mV
tOFF
Off-time
265 ns
www.national.com
4
4페이지 Typical Performance Characteristics
FIGURE 2. VCC vs VIN
20119904
20119906
FIGURE 4. ICC vs Externally Applied VCC
FIGURE 3. VCC vs ICC
20119905
20119907
FIGURE 5. On-Time vs VIN and RON
7 www.national.com
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부품번호 | 상세설명 및 기능 | 제조사 |
LM5010MH | High Voltage 1A Step Down Switching Regulator | National Semiconductor |
LM5010MHX | High Voltage 1A Step Down Switching Regulator | National Semiconductor |
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