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LM2618BTLX 데이터시트 PDF




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부품번호 LM2618BTLX 기능
기능 400mA Sub-miniature/ High Efficiency/ Synchronous PWM & PFM Programmable DC-DC Converter
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LM2618BTLX 데이터시트, 핀배열, 회로
September 2002
LM2618
400mA Sub-miniature, High Efficiency, Synchronous
PWM & PFM Programmable DC-DC Converter
General Description
The LM2618 step-down DC-DC converter is optimized for
powering low voltage circuits from a single Lithium-Ion cell. It
provides up to 400mA (300mA for B grade), over an input
voltage range of 2.8V to 5.5V. Pin programmable output
voltages of 1.80V, 1.83V, 1.87V or 1.92V allow adjustment
for MPU voltage options without board redesign or external
feedback resistors. Internal synchronous rectification pro-
vides high efficiency in both PWM and PFM operation.
The device has three pin-selectable modes for maximizing
battery life in mobile phones and similar portable applica-
tions. Low-noise PWM mode offers 600kHz fixed-frequency
operation to reduce interference in RF and data acquisition
applications during full-power operation. A SYNC input al-
lows synchronizing the switching frequency in a range of
500kHz to 1MHz to avoid noise from intermodulation with
system frequencies. Low-current hysteretic PFM mode re-
duces quiescent current to 180 µA (typ.) during system
standby. Shutdown mode turns the device off and reduces
battery consumption to 0.02µA (typ.). Additional features
include soft start and current overload protection.
The LM2618 is available in a 10 pin micro SMD packge. This
package uses National’s wafer level chip-scale micro SMD
technology and offers the smallest possible size. Only three
small external surface-mount components, an inductor and
two ceramic capacitors are required.
Key Specifications
n Operates from a single LiION cell (2.8V to 5.5V)
n Internal synchronous rectification provides high
efficiency in both PWM and PFM
n Pin programmable output voltage (1.80V, 1.83V, 1.87V
and 1.92V)
n 400mA maximum load capability (300mA for B grade)
n ±2% PWM mode DC output voltage precision
n 5mV typ PWM mode output voltage ripple
n 180 µA typ PFM mode quiescent current
n 0.02µA typ shutdown mode current
n Internal synchronous rectification for high efficiency
(91% at 3.0VIN, 1.92VOUT)
n 600kHz PWM mode switching frequency
n SYNC input for PWM mode frequency synchronization
from 500kHz to 1MHz
Features
n Sub-miniature 10-pin micro SMD package
n Only three tiny surface-mount external components
required
n Uses small ceramic capacitors.
n Internal soft start
n Current overload protection
n Thermal Shutdown Protection
n No external compensation required
Applications
n Mobile Phones
n Hand-Held Radios
n Battery Powered Devices
Typical Application Circuit
© 2002 National Semiconductor Corporation DS200364
20036402
www.national.com




LM2618BTLX pdf, 반도체, 판매, 대치품
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
PVIN, VDD, to SGND
PGND to SGND
EN, SYNC/MODE, VID0, VID1 to
SGND
FB, SW
Storage Temperature Range
−0.2V to +6V
−0.2V to +0.2V
−0.2V to +6V
(GND −0.2V) to
(VDD +0.2V)
−45˚C to +150˚C
Lead temperature
(Soldering, 10 sec.)
Junction Temperature (Note 2)
Minimum ESD Rating
Human body model, C = 100pF, R =
1.5 k
Thermal Resistance (θJA)
LM2618ATL & LM2618BTL (Note 3)
260˚C
−25˚C to 125˚C
±2.0kV
140˚C/W
Electrical Characteristics
Specifications with standard typeface are for TA = TJ = 25˚C, and those in bold face type apply over the full Operating Tem-
perature Range (TA = TJ = - 25˚C to +85˚C). Unless otherwise specified, PVIN = VDD = EN = SYNC = 3.6V, VID0 = VID1 =
0V.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VIN
Input Voltage Range (Note PVIN = VDD = VID1 = VID0 =
2.8
4) VIN
PVIN = VDD = VD1 = VIN,
3.0
VID0 = 0V
5.5
V
5.5
Feedback Voltage
VFB (Note 5)
VID0 = VIN, VID1 = VIN
VID0 = VIN, VID1 = 0V
VID0 = 0V, VID1 = 0V
1.764
1.793
1.833
1.80
1.83
1.87
1.836
1.867
1.907
V
VHYST
PFM Comparator Hysteresis
Voltage
(Note 6)
VID0 = 0V, VID1 = VIN
PFM Mode (SYNC = 0V)
1.882
1.92
25
1.958
mV
ISHDN
IQ1
IQ2
RDSON (P)
Shutdown Supply Current
DC Bias Current into VDD
Pin-Pin Resistance for P
FET
EN = 0V
PFM mode, VFB = 2V
PWM mode, VFB = 2V
LM2618ATL & LM2618BTL
0.02
180
605
395
3
215
735
550
µA
µA
m
RDSON (N)
Pin-Pin Resistance for N
FET
LM2618ATL & LM2618BTL
330 500 m
RDSON , TC
FET Resistance
Temperature Coefficient
0.5 %/C
Ilim Switch Peak Current Limit LM2618ATL
(Note 7)
LM2618BTL
540 720 880
mA
430 720 1020
VEN_H
EN Positive Going
Threshold Voltage
VDD = 3.6V
0.95
1.3
V
VEN_L
EN Negative Going
Threshold Voltage
VDD = 3.6V
0.4 0.80
V
VSYNC_H
SYNC/MODE Positive
Going Threshold Voltage
0.95
1.3
V
VSYNC_L
SYNC/MODE Negative
Going Threshold Voltage
0.4 0.84
V
VID_H
VID0, VID1 Positive Going
Threshold Voltage
0.92
1.3
V
VID_L
VID0, VID1 Negative Going
Threshold Voltage
0.4 0.83
V
IVID
VID1, VID0 Pull Down
VID1, VID0 = 3.6V
Current
1.8 3.0
µA
www.national.com
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LM2618BTLX 전자부품, 판매, 대치품
Typical Operating Characteristics LM2618ATL, Circuit of Figure 1, VIN = 3.6V, TA = 25˚C, L1 = 10 µH,
unless otherwise noted. (Continued)
Output Voltage vs Supply Voltage
(VOUT = 1.8V, PFM Mode)
Output Voltage vs Output Current
(VOUT = 1.8V, PWM Mode)
20036419
Output Voltage vs Output Current
(VOUT = 1.8V, PFM Mode)
20036417
Efficiency vs Output Current
(VOUT = 1.8V, PWM Mode)
20036420
Efficiency vs Output Current
(VOUT = 1.8V, PFM Mode)
20036423
Switching Frequency vs Temperature
(PWM Mode)
20036424
7
20036408
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관련 데이터시트

부품번호상세설명 및 기능제조사
LM2618BTL

400mA Sub-miniature/ High Efficiency/ Synchronous PWM & PFM Programmable DC-DC Converter

National Semiconductor
National Semiconductor
LM2618BTLX

400mA Sub-miniature/ High Efficiency/ Synchronous PWM & PFM Programmable DC-DC Converter

National Semiconductor
National Semiconductor

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