LM2653 반도체 회로 부품 판매점
1.5A High Efficiency Synchronous Switching Regulator
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 National Semiconductor |
November 1999
LM2653
1.5A High Efficiency Synchronous Switching Regulator
General Description
The LM2653 switching regulator provides high efficient
power conversion over a 100:1 load range (1.5A to 15 mA).
This feature makes the LM2653 an ideal fit in
battery-powered applications.
Synchronous rectification is used to achieve up to 97% effi-
ciency. At light loads, the LM2653 enters a low power hyster-
etic or “sleep” mode to keep the efficiency high. In many ap-
plications, the efficiency still exceeds 80% at 15 mA load. A
shutdown pin is available to disable the LM2653 and reduce
the supply current to 7µA.
All the power, control, and drive functions are integrated
within the ICs. The ICs contain patented current sensing cir-
cuity for current mode control. This feature eliminates the ex-
ternal current sensing resistor required by other
current-mode DC-DC converters.
The ICs have a 300 kHz fixed frequency internal oscillator.
The high oscillator frequency allows the use of extremely
small, low profile components.
Protection features include thermal shutdown, input under-
voltage lockout, adjustable soft-start, cycle by cycle current
limit, output overvoltage and undervoltage protections.
Features
n Efficiency up to 97%
n 4V to 14V input voltage range
n 1.5V to 5.0V adjustable output voltage
n 0.1Ω Switch On Resistance
n 300 kHz fixed frequency internal oscillator
n 7 µA shutdown current
n Patented current sensing for current mode control
n Input undervoltage lockout
n Output overvoltage shutdown protection
n Output undervoltage shutdown protection
n Adjustable soft-start
n Adjustable PGOOD delay
n Current limit and thermal shutdown
Applications
n Webpad
n Personal digital assistants (PDAs)
n Computer peripherals
n Battery-powered devices
n Notebook computer video supply
n Handheld scanners
n GXM I/O and core voltage
n High efficiency 5V conversion
Typical Application
Efficiency vs Load Current
(VIN = 5V, VOUT = 3.3V)
DS101049-2
© 1999 National Semiconductor Corporation DS101049
DS101049-30
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.
Input Voltage
PGOOD Pin Voltage
Feedback Pin Voltage
Power Dissipation (TA =25˚C),
(Note 2)
Junction Temperature
Range
Storage Temperature Range
15V
15V
−0.4V ≤ VFB ≤ 5V
893 mW
−40˚C ≤ TJ ≤ +125˚C
−65˚C to +150˚C
Lead Temperature
M Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
Maximum Junction
Temperature
ESD Susceptibility
Human Body Model (Note 3)
215˚C
220˚C
150˚C
1 kV
Operating Ratings (Note 1)
Supply Voltage
4V ≤ VIN ≤ 14V
Electrical Characteristics
Specifications
Range. VIN =
with
10V
standard typeface are for TJ
unless otherwise specified.
=
25˚C,
and
those
in
boldface
type
apply
over
full
Operating
Temperature
Symbol
Parameter
Conditions
Typical
(Note 5)
Limit
(Note 4)
Units
VFB
Feedback Voltage
ILOAD = 900 mA
1.238
1.200
1.263
V
V(min)
V(max)
VOUT
VINUV
Output Voltage Line
Regulation
Output Voltage Load
Regulation
Output Voltage Load
Regulation
VIN Undervoltage Lockout
Threshold Voltage
VIN = 4V to 12V
ILOAD = 900 mA
ILOAD = 10 mA to 1.5A
VIN = 5V
ILOAD = 200 mA to 1.5A
VIN = 5V
Rising Edge
0.2 %
1.3 %
0.3 %
3.8 V
3.95 V(max)
VUV_HYST
Hysteresis for the Input
Undervoltage Lockout
210 mV
ICL
Switch Current Limit
VIN = 5V
VOUT = 2.5V
2.0 A
1.55 A(min)
2.60 A(max)
ISM
Sleep Mode Threshold
VIN = 5V, VOUT = 2.5V
Current
100
mA
VHYST
Sleep Mode Feedback
Voltage Hysteresis
24 mV
IQ Quiescent Current
1.7 mA
2.0 mA(max)
IQSD
Quiescent Current in
Shutdown Mode
Shutdown Pin Pulled Low
7 µA
12/20
µA(max)
RDS(ON)
High-Side or Low-Side
MOSFET ON Resistance
ISWITCH = 1A
75 mΩ
130 mΩ (max)
RSW(ON)
High-Side or Low-Side
Switch On Resistance
(MOSFET ON Resistance
+ Bonding Wire
Resitstance)
ISWITCH = 1A
110 mΩ
IL Switch Leakage
Current — High Side
130 nA
Switch Leakge
Current — Low Side
130 nA
VBOOT
Bootstrap Regulator
Voltage
IBOOT = 1 mA
6.75 V
6.45/6.40
V(min)
6.95/7.00
V(max)
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