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PDF LM2608ATL-1.3 Data sheet ( Hoja de datos )

Número de pieza LM2608ATL-1.3
Descripción 400mA Sub-miniature/ High Efficiency/ Programmable DC-DC Converter with Linear Mode
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! LM2608ATL-1.3 Hoja de datos, Descripción, Manual

December 2002
LM2608
400mA Sub-miniature, High Efficiency, Programmable
DC-DC Converter with Linear Mode
General Description
The LM2608 step-down DC-DC converter is optimized for
powering ultra-low voltage circuits from a single Lithium-Ion
cell. It provides up to 400mA over an input voltage range of
2.8V to 5.5V. Operating from a 1.35V reference, this device
provides pin-selectable output voltages of 1.3V/1.5V
(300mA) for low voltage version or 1.5V/1.8V (400mA) for
high voltage version. This allows adjustment for DSP or CPU
voltage options, as well as dynamic output voltage switching
for reduced power consumption. Internal synchronous recti-
fication provides high efficiency.
The LM2608 offers superior features and performance for
mobile phones and similar portable applications with com-
plex power management systems. Pin-selectable PWM low-
noise and linear micropower modes offer improved system
control for maximizing battery life. During full power opera-
tion, fixed-frequency PWM mode reduces interference in RF
and data acquisition applications by minimizing noise har-
monics at sensitive IF and sampling frequencies. A SYNC
input allows synchronizing the switching frequency in a
range of 500kHz to 1MHz to avoid noise from intermodula-
tion with system frequencies. Linear operation reduces qui-
escent current to 20µA (typ) during system standby for ex-
tended battery life. It provides up to 3 mA in the linear mode.
Shutdown reduces battery consumption to 0.02µA (typ.).
The LM2608 is available in a 10 pin Micro SMD package.
This package uses National’s wafer level chip-scale Micro
SMD technology and offers the smallest possible size. A high
switching frequency (600KHz) allows use of tiny surface-
mount components. Only four small external surface-mount
components, an inductor and three ceramic capacitors are
required. Pin selectable output voltage eliminates the need
for bulky external feedback resistors.
Key Specifications
n Operates from a single LiION cell (2.8V to 5.5V)
n Pin selectable output voltage (1.5V/1.8V or 1.3V/1.5V
versions), without external feedback resistors
n 400mA maximum load capability
n ±1% PWM mode DC output voltage precision
(Excluding external reference tolerance)
n 5mV typ PWM mode output voltage ripple
n 20 µA typ quiescent current (Linear Mode)
n 0.02µA typ shutdown mode current
n Internal synchronous rectification for high efficiency
(91% at 2.8VIN, 1.8VOUT)
n 600kHz PWM mode switching frequency
n SYNC input for PWM mode frequency synchronization
from 500kHz to 1MHz
n 15% accuracy for FOSC and Ilim
Features
n Sub-miniature 10-pin thin Micro SMD package
n Only four tiny surface-mount external components
required
n Uses small ceramic capacitors
n Internal soft start
n Current and Thermal shutdown protection
n No external compensation required
Applications
n Mobile Phones
n Hand-Held Radios
n Battery Powered Devices
Typical Application Circuit
© 2003 National Semiconductor Corporation DS200366
20036602
www.national.com

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LM2608ATL-1.3 pdf
Electrical Characteristics (Continued)
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, VSEL = 0V,
VREF = 1.35V.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VSYNC_H
SYNC/MODE Positive
Going Threshold Voltage
0.85
1.3
V
VSYNC_L
SYNC/MODE Negative
Going Threshold Voltage
0.4 0.80
V
VSEL_H
VSEL Positive Going
Threshold Voltage
0.80
1.3
V
VSEL_L
VSEL Negative Going
Threshold Voltage
0.4 0.75
V
ISEL
IREF
fsync
VSEL Pull Down Current
Input current into VREF pin
SYNC/MODE Clock
Frequency Range
(Note 9)
VSEL = 1.2V
0.70
15
2
150
µA
nA
500
1000
kHz
FOSC
Internal Oscillator
Frequency
LM2608ATL-1.3/1.8, PWM
Mode
510 610 690 kHz
Tmin
Minimum ON-Time of P FET
Switch in PWM Mode
200 ns
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended
to be functional, but parameter specifications may not be guaranteed. For guaranteed specifications and associated test conditions, see the Min and Max limits and
Conditions in the Electrical Characteristics table. Electrical Characteristics table limits are guaranteed by production testing, design or correlation using standard
Statistical Quality Control methods. Typical (Typ) specifications are mean or average values from characterization at 25˚C and are not guaranteed.
Note 2: Thermal shutdown will occur if the junction temperature exceeds the 150˚C maximum junction temperature of the device.
Note 3: Thermal resistance specified with 2 layer PCB(0.5/0.5 oz. cu).
Note 4: The LM2608 is designed for cell phone applications where turn-on after system power-up is controlled by the system processor and internal UVLO (Under
Voltage LockOut) circuitry is unnecessary. The LM2608 has no UVLO circuitry and should be kept in shutdown by holding the EN pin low until the input voltage
exceeds 2.8V. Although the LM2608 exhibits safe behavior while enabled at low input voltages, this is not guaranteed.
Note 5: The LM2608 PWM mode output voltage precision is ±1% when operating from an external 1.35V reference voltage.
Note 6: The hysteresis voltage is the minimum voltage swing on FB that causes the internal feedback and control circuitry to turn the internal PFET switch on and
then off, during test mode.
Note 7: Current limit is built-in, fixed, and not adjustable. If the current limit is reached while the output is pulled below about 0.7V, the internal PFET switch turns
off for 2.5 µs to allow the inductor current to diminish.
Note 8: EN is a Schmitt trigger digital input with logic thresholds that are independent of supply voltage at the VDD pin.
Note 9: SYNC driven with an external clock switching between VDD and GND. When an external clock is present at SYNC, the IC is forced into PWM mode at the
external clock frequency. The LM2608 synchronizes to the rising edge of the external clock.
5 www.national.com

5 Page





LM2608ATL-1.3 arduino
Typical Operating Characteristics LM2608ATL, Circuit of Figure 1, VIN = 3.6V, TA = 25˚C, L1 = 10 µH,
unless otherwise noted. (Continued)
LDO Line Transient Response
LDO Start-up Response
LDO to PWM Mode Change
20036649
20036640
20036641
11 www.national.com

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