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LM2830 High Frequency 1.0A Load - Step-Down DC-DC Regulator
March 20, 2008
LM2830
High Frequency 1.0A Load - Step-Down DC-DC Regulator
General Description
The LM2830 regulator is a monolithic, high frequency, PWM
step-down DC/DC converter in a 5 pin SOT23 and a 6 Pin
LLP package. It provides all the active functions to provide
local DC/DC conversion with fast transient response and ac-
curate regulation in the smallest possible PCB area. With a
minimum of external components, the LM2830 is easy to use.
The ability to drive 1.0A loads with an internal 130 mΩ PMOS
switch using state-of-the-art 0.5 µm BiCMOS technology re-
sults in the best power density available. The world-class
control circuitry allows on-times as low as 30ns, thus sup-
porting exceptionally high frequency conversion over the en-
tire 3V to 5.5V input operating range down to the minimum
output voltage of 0.6V. Switching frequency is internally set
to 1.6 MHz, or 3.0 MHz, allowing the use of extremely small
surface mount inductors and chip capacitors. Even though the
operating frequency is high, efficiencies up to 93% are easy
to achieve. External shutdown is included, featuring an ultra-
low stand-by current of 30 nA. The LM2830 utilizes current-
mode control and internal compensation to provide high-
performance regulation over a wide range of operating
conditions. Additional features include internal soft-start cir-
cuitry to reduce inrush current, pulse-by-pulse current limit,
thermal shutdown, and output over-voltage protection.
Features
■
■
■
■
■
■
■
■
■
■
■
Space Saving SOT23-5 Package
Input voltage range of 3.0V to 5.5V
Output voltage range of 0.6V to 4.5V
1.0A output current
High Switching Frequencies
1.6MHz (LM2830X)
3.0MHz (LM2830Z)
130mΩ PMOS switch
0.6V, 2% Internal Voltage Reference
Internal soft-start
Current mode, PWM operation
Thermal Shutdown
Over voltage protection
Applications
■
■
■
■
■
■
Local 5V to Vcore Step-Down Converters
Core Power in HDDs
Set-Top Boxes
USB Powered Devices
DSL Modems
Automotive
Typical Application Circuit
20197464
© 2008 National Semiconductor Corporation
201974
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LM2830
20197481
Connection Diagrams
20197401
20197403
6-Pin LLP
5-Pin SOT-23
Ordering Information
Order Number
LM2830XMF
LM2830XMFX
LM2830XQMF
LM2830XQMFX
LM2830XQMFE
LM2830ZMF
LM2830ZMFX
LM2830ZSD
LM2830ZSDX
NOPB versions available as well
Frequency
Option
Package
Type
NSC Package
Drawing
Top Mark
SKTB
Supplied As
1000 units T& R
3000 units T& R
1000 units T& R
3000 units T& R
250 units T& R
Features
1.6MHz
SOT23-5
MF05A
SUFB
AEC-Q100 Grade 1
qualified. Automotive
Grade Production
Flow.
SOT23-5
3MHz
LLP-6
MF05A
SDE06A
SKXB
L192B
1000 units T& R
3000 units T& R
1000 units T& R
4500 units T& R
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2
LM2830
Pin Descriptions 5-Pin SOT23
Pin
1
2
3
4
5
Name
SW
GND
FB
EN
VIN
Function
Output switch. Connect to the inductor and catch diode.
Signal and power ground pin. Place the bottom resistor of the feedback network as close as
possible to this pin.
Feedback pin. Connect to external resistor divider to set output voltage.
Enable control input. Logic high enables operation. Do not allow this pin to float or be greater
than VIN + 0.3V.
Input supply voltage.
Pin Descriptions 6-Pin LLP
Pin
1
2
3
4
5
6
DAP
Name
FB
GND
SW
VIND
VINA
EN
Die Attach Pad
Function
Feedback pin. Connect to external resistor divider to set output voltage.
Signal and power ground pin. Place the bottom resistor of the feedback network as close
as possible to this pin.
Output switch. Connect to the inductor and catch diode.
Power Input supply.
Control circuitry supply voltage. Connect VINA to VIND on PC board.
Enable control input. Logic high enables operation. Do not allow this pin to float or be greater
than VINA + 0.3V.
Connect to system ground for low thermal impedance, but it cannot be used as a primary
GND connection.
3
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LM2830
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
FB Voltage
EN Voltage
SW Voltage
ESD Susceptibility
-0.5V to 7V
-0.5V to 3V
-0.5V to 7V
-0.5V to 7V
2kV
Junction Temperature (Note 2)
Storage Temperature
Soldering Information
150°C
−65°C to +150°C
Infrared or Convection Reflow
(15 sec)
220°C
Operating Ratings
VIN
Junction Temperature
3V to 5.5V
−40°C to +125°C
Electrical Characteristics
VIN = 5V unless otherwise indicated under the
Conditions
column. Limits in standard
type are for T
J
= 25°C only; limits in
boldface type
apply over the junction temperature (T
J
) range of -40°C to +125°C. Minimum
and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely
parametric norm at T
J
= 25°C, and are provided for reference purposes only.
Symbol
V
FB
ΔV
FB
/V
IN
I
B
UVLO
Parameter
Feedback Voltage
Feedback Voltage Line Regulation
Feedback Input Bias Current
Undervoltage Lockout
UVLO Hysteresis
F
SW
D
MAX
D
MIN
R
DS(ON)
I
CL
V
EN_TH
I
SW
I
EN
I
Q
Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Switch On Resistance
Switch Current Limit
Shutdown Threshold Voltage
Enable Threshold Voltage
Switch Leakage
Enable Pin Current
Quiescent Current (switching)
Quiescent Current (shutdown)
Sink/Source
LM2830X V
FB
= 0.55
LM2830Z V
FB
= 0.55
All Options V
EN
= 0V
1.8
100
100
3.3
4.3
30
5
6.5
LM2830-X
LM2830-Z
LM2830-X
LM2830-Z
LM2830-X
LM2830-Z
LLP-6 Package
SOT23-5 Package
V
IN
= 3.3V
1.2
1.2
2.25
86
82
V
IN
Rising
V
IN
Falling
1.85
Conditions
LLP-6 and SOT23-5
Package
V
IN
= 3V to 5V
Min
0.588
Typ
0.600
0.02
0.1
2.73
2.3
0.43
1.6
3.0
94
90
5
7
150
130
1.75
0.4
195
1.95
3.75
V
MHz
%
%
mΩ
A
V
nA
nA
mA
mA
nA
100
2.90
Max
0.612
Units
V
%/V
nA
V
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