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PDF FAN5308 Data sheet ( Hoja de datos )
| Número de pieza | FAN5308 | |
| Descripción | 800mA High-Efficiency Step-Down DC-DC Converter | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FAN5308 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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April 2005
FAN5308
800mA High-Efficiency Step-Down DC-DC Converter
www.datasheet4u.com
Features
Description
■ 96% Efficiency, Synchronous Operation
■ Adjustable Output Voltage Options from 0.8V to VIN
■ 2.5V to 5.5V Input Voltage Range
■ Up to 800mA Output Current
■ Fixed Frequency 1.3MHz PWM Operation
■ High Efficiency Power Save Mode
■ 100% Duty Cycle Low Dropout Operation
■ Soft Start
■ Output Over-Voltage Protection
■ Dynamic Output Voltage Positioning
■ 25µA Quiescent Current
■ Thermal Shutdown and Short Circuit Protection
■ Pb-Free 3x3mm 6-Lead MLP Package
Applications
■ Pocket PCs, PDAs
■ Cell Phones
■ Battery-Powered Portable Devices
■ Digital Cameras
■ Hard Disk Drives
■ Set-Top-Boxes
■ Point-of-Load Power
■ Notebook Computers
■ Communications Equipment
Designed for use in battery-powered applications, the FAN5308
is a high-efficiency, low-noise synchronous PWM current mode
and Pulse Skip (Power Save) mode DC-DC converter. It can
provide up to 800mA of output current over a wide input range
from 2.5V to 5.5V. The output voltage can be externally adjusted
over a wide range of 0.8V to 5.5V by means of an external volt-
age divider.
At moderate and light loads, pulse skipping modulation is used.
Dynamic voltage positioning is applied, and the output voltage is
shifted 0.8% above nominal value for increased headroom dur-
ing load transients. At higher loads the system automatically
switches over to current mode PWM control, operating at 1.3
MHz. A current mode control loop with fast transient response
ensures excellent line and load regulation. To achieve high effi-
ciency and ensure long battery life, the quiescent current is
reduced to 25µA in Power Save mode, and the supply current
drops below 1µA in shut-down mode. The FAN5308 is available
in a 3x3mm 6-lead MLP package.
Typical Application
CIN
10µF
VIN
1
PGND
2
EN
3
P1
(AGND)
SW
6
3.3µH
5 NC
R1
FB
4
5KΩ
R2 10KΩ
VOUT
1.2V (800mA)
COUT
2 x 10µF
Figure 1. Typical Application
FAN5308 Rev. 1.0.1
©2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
1 page  
Typical Performance Characteristics
TA = 25°C, CIN = 10µF, COUT = 20µF, L = 3.3µH, R2 = 10KΩ, unless otherwise noted.
Efficiency vs. Load Current
100
www.datasheet49u5.com
90
85
80
VIN = 3.6V
75 VOUT = 3V
70
VIN = 5V
VOUT = 3.3V
VIN = 3.6V
VOUT = 1.2V
65
60
1
10 100 1000
Load Current (mA)
Efficiency vs. Load Current
100
95
90
85
80
75
70
65
60
55
VIN = 5.5V
50
45
40
35
0.1
1
VIN = 3.9V
10
VOUT = 3.3V
R 2 = 100KΩ
100
Load Current (mA)
1000
Efficiency vs. Load Current
100
VOUT = 1.2V
90
R 2 = 100KΩ
80
70
60 VIN = 2.5V
50
40 VIN = 3. 6V
VIN = 5.5V
30
0.1
1 10 100
Load Current (mA)
1000
Quiescent Current vs. Input Voltage
80
70 VOUT = 1. 2V
60
50
40
R 2 = 10KΩ
30
20
10
R 2 = 100KΩ
0
2.5 3.0 3.5 4.0 4.5 5.0
Input Voltage (V)
5.5
1.214
1.212
1.210
1.208
1.206
1.204
1.202
1.200
1.198
1.196
1.194
1.192
0
Output Voltage vs. Load Current
VIN = 5V
200 400 600 800
Load Current (mA)
1000
1400
1380
1360
1340
1320
1300
1280
1260
1240
1220
1200
-40
Frequency vs. Temperature
VIN = 5.5V
VIN = 3.6V
VIN = 2.5V
-20 0
20 40 60 80
Temperature (°C)
100
FAN5308 Rev. 1.0.1 5 www.fairchildsemi.com
5 Page 
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is
not intended to be an exhaustive list of all such trademarks.
ACEx™
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www.datasheeCt4uo.ocloFmET™
FRFET™
MICROCOUPLER™ PowerSaver™
SuperSOT™-3
CROSSVOLT™ GlobalOptoisolator™ MicroFET™
PowerTrench
SuperSOT™-6
DOME™
GTO™
MicroPak™
QFET
SuperSOT™-8
EcoSPARK™ HiSeC™
MICROWIRE™
QS™
SyncFET™
E2CMOS™
I2C™
MSX™
QT Optoelectronics™ TinyLogic
EnSigna™
i-Lo™
MSXPro™
Quiet Series™
TINYOPTO™
FACT™
ImpliedDisconnect™ OCX™
RapidConfigure™
TruTranslation™
FACT Quiet Series™
OCXPro™
RapidConnect™
UHC™
Across the board. Around the world.™ OPTOLOGIC
The Power Franchise
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DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TOANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOTASSUMEANY LIABILITY
ARISING OUT OF THEAPPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT
CONVEYANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTENAPPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or
2. A critical component is any component of a life
systems which, (a) are intended for surgical implant into
support device or system whose failure to perform can
the body, or (b) support or sustain life, or (c) whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system, or to affect its safety or
with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the
effectiveness.
user.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Formative or
In Design
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
Preliminary
First Production
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
No Identification Needed
Full Production
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
Obsolete
FAN5308 Rev. 1.0.1
Not In Production
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Rev. I15
11 www.fairchildsemi.com
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet FAN5308.PDF ] | |
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