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PDF LA8040 Data sheet ( Hoja de datos )
| Número de pieza | LA8040 | |
| Descripción | 5V 2A Synchronous Step-Down Converter | |
| Fabricantes | INNO-TECH | |
| Logotipo |  |
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LA8040
1MHz, 5V/2A Synchronous Step-Down Converter
General Description
Features
The LA8040 is a current mode, synchronous
step-down DC-DC converter that is designed to
meet 2A output current, and utilizes PWM
control scheme that switches with 1MHz fixed
frequency.
The input voltage range of LA8040 is from 2.5V
to 6V, and available in adjustable output
voltage from 0.8V to VIN. The supply current is
only 0.6mA during operation and under 25uA in
shutdown.
This device provides an enable function that can
be controlled by external logic signal. It also
provides excellent regulation during line or load
transient due to the current mode operation.
Other features of soft-start, current limit,
thermal shutdown protection, short circuit
protection, and over voltage protection are also
included. The under voltage lockout prevents
low input voltage start-up until it reaches the
UVLO threshold voltage. It is available in the
Exposed Pad SOP-8 (ESOP) package.
l Continuous 2A Output Capability
l 0.8V Reference Voltage
l 2.5V to 6V Input Voltage Range
l Adjustable Output from 0.8V to VIN
l 1MHz Oscillation Frequency
l 0.6mA Low Supply Current
l 25uA Low Shutdown Current
l Internal Soft-Start & Current Limit
l Current Mode for Excellent Response
l Short Circuit Protection
l Thermal shutdown Protection
l Over Voltage Protection
l Under Voltage Lockout
l Available in ESOP-8 Package
l Meet RoHS Standard
Applications
l LCD TV / Monitor
l Set-Top-Box
l Portable & Storage Device
l Wireless & Broadband Communication
Ordering Information
LA8040 1 2 3 4
1 (Package Type) => J: SOP
2 (Number of Pins) => G: 8 pin
3 (Output Voltage) => Blank: Adjustable
4 (Special Feature) => Blank: N/A
Available Part Number
LA8040JG
Marking Information
1 2 (Date Code)
For date code rule, please contact our
sales representative directly.
3 4 (Internal Code)
Rev01
-1-
Mar. 07, 2013
www.inno.com.tw
Free Datasheet http://www.Datasheet4U.com
1 page  
LA8040
Absolute Maximum Ratings
Parameter
Input Voltage
SW Voltage Range
FB Voltage Range
EN Voltage Range
Storage Temperature Range
Junction Temperature
Lead Soldering Temperature (10 sec)
Rating
6.5V
-0.3V ~ VCC+0.3V
-0.3V ~ VCC+0.3V
-0.3V ~ VCC+0.3V
-65oC ~ 150oC
150 oC
300 oC
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for
prolonged time periods may affect device reliability. All voltages are with respect to ground.
Recommended Operating Conditions
Parameter
Input Voltage Range
Ambient Temperature Range
Junction Temperature Range
Rating
2.5V ~ 6V
-40oC ~ 85oC
-40oC ~ 125oC
These are conditions under which the device functions but the specifications might not be guaranteed. For
guaranteed specifications and test conditions, please see the Electrical Specifications.
Package Information
Parameter
Thermal Resistance
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Package
SOP-8
Symbol
θJC
θJA
Rating
40 oC/W
105 oC/W
Rev01
-5-
Mar. 07, 2013
www.inno.com.tw
Free Datasheet http://www.Datasheet4U.com
5 Page 
LA8040
Component Selection
Inductor Selection
The conduction mode of power stage depends on input voltage, output voltage, output current,
and the value of the inductor. Select an inductor to maintain this device operating in continuous
conduction mode (CCM). The minimum value of inductor can be determined by the following
procedure.
(1) Calculate the minimum duty cycle:
VOUT + ILOAD × RL + VDS _ NMOS
TON
D(MIN) = VIN(MAX) - VDS _ PMOS + VDS _ NMOS = TS
Where RL is the DC resistance of the external inductor, VDS is the turn-on voltage of the internal
MOSFET, and Ts is the switching period. This formula can be simplified to
V OUT
TON
D(MIN ) =
=
V IN(MAX )
TS
; 0 ≤D ≤1
(2) Define a value of minimum current that is approximately 10%~30% of full load current to
maintain continuous conduction mode, usually referred to as the critical current (ICRIT).
IL
ILOAD
ICRIT
T ICRIT = δ × ILOAD ; δ =0.1~0.3
(3) Calculate the inductor ripple current (△IL). In steady state conditions, the inductor ripple
current increase, (△IL+), during the ON time and the current decrease, (△IL-), during the OFF
time must be equal.
IL TS
TOFF TON
ICRIT
△IL
T
ΔIL = 2 × ICRIT
(4) Calculate the minimum value of inductor use maximum input voltage. That is the worst case
condition because it gives the maximum △IL.
L ≥ [VIN(MAX ) - ILOAD × (RDS(ON) + RL) - VOUT ] × D(MIN )
ΔIL × fs
This formula can be simplified to
L ≥ (VIN(MAX) - VOUT)×D(MIN)
ΔIL × fs
Rev01
- 11 -
Mar. 07, 2013
www.inno.com.tw
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LA8040.PDF ] | |
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