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PDF FAN5307SX Data sheet ( Hoja de datos )
| Número de pieza | FAN5307SX | |
| Descripción | High-Efficiency Step-Down DC-DC Converter | |
| Fabricantes | Fairchild Semiconductor | |
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www.fairchildsemi.com
FAN5307
High-Efficiency Step-Down DC-DC Converter
Features
• 95% Efficiency, Synchronous Operation
• Adjustable Output Voltage Option from 0.7V to VIN
• 2.5V to 5.5V Input Voltage Range
• Customized Fixed Output Voltage Options
• Up to 300mA Output Current
• Fixed Frequency 1MHz PWM Operation
• High Efficiency Power Save Mode
• 100% Duty Cycle Low Dropout Operation
• Soft Start
• Dynamic Output Voltage Positioning
• 15µA Quiescent Current
• Excellent Load Transient Response
• 5-Lead SOT-23 Package
• 6-Lead MLP 3x3mm Package
Applications
• Pocket PCs, PDAs
• Cell Phones
• Battery-Powered Portable Devices
• Digital Cameras
• Low Power DSP Supplies
Description
The FAN5307, a high efficiency low noise synchronous
PWM current mode and Pulse Skip (Power Save) mode
DC-DC converter is designed for battery-powered applica-
tions. It provides up to 300mA of output current over a wide
input range from 2.5V to 5.5V. The output voltage can be
either internally fixed or externally adjustable over a wide
range of 0.7V to 5.5V by an external voltage divider. Custom
output voltages are also available.
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 during load transients. At higher loads the system
automatically switches to current mode PWM control,
operating at 1 MHz. A current mode control loop with fast
transient response ensures excellent line and load regulation.
In Power Save mode, the quiescent current is reduced to
15µA in order to achieve high efficiency and to ensure long
battery life. In shut-down mode, the supply current drops
below 1µA. The device is available in 5-lead SOT-23 and
6-lead MLP 3x3mm packages.
Typical Application
100
95
90
85
80
75
70
65
0.01
EFFICIENCY vs. LOAD CURRENT
VOUT = 1.8V
VIN=2.5V
VIN=3.6V
VIN=5.5V
0.1 1 10 100
Load Current [mA]
1000
REV. 1.0.2 6/22/04
1 page  
FAN5307
PRODUCT SPECIFICATION
Electrical Characteristics for Fixed VOUT = 1.8V Version
VIN = 2.5V to 5.5V, IOUT = 200mA, EN = VIN, CIN = 4.7µF, COUT = 22µF, LX = 10µH, TA = -40°C to +85°C, unless
otherwise noted. Typical values are at TA = 25°C.
Parameter
PFM to PWM Transition Voltage
(Note 4)
PFM to PWM Transition Voltage
(Note 4)
Output Voltage during Mode
Transition (Note 5, 6)
Over Voltage Clamp Threshold
Conditions
VIN = 3.7V, TA = 25°C,
0.1 m A ≤ IO U T ≤ 300 m A
VIN = 4.2V, TA = 25°C,
0.1 m A ≤ IO U T ≤ 300 m A
Incl. line, load, load transients,
and temperature
Min.
1.7
Typ.
1.878
Max.
72
72
1.93
1.93
Units
mV
mV
V
V
Note:
4. Transition voltage is defined as the difference between the output voltage measured at 0.1m A (PFM mode) and 300mA
(PWM mode), respectively.
5.
200
2
0
tr = 10µS
0.01
ss
tf = 2µS
0.587 0.589
4.6
Load Transient Response Test Waveform
Time (mSec)
6. These limits also apply to any mode transition caused by any kind of load transition within specified output current range.
REV. 1.0.2 6/22/04
5
5 Page 
FAN5307
Mechanical Dimensions
5-Lead SOT-23 Package
B
e
EH
e1
D
A
A1
PRODUCT SPECIFICATION
Symbol
A
A1
B
c
D
E
e
e1
H
L
α
Inches
Min Max
.035 .057
.000 .006
.008 .020
.003 .010
.106 .122
.059 .071
.037 BSC
.075 BSC
.087 .126
.004 .024
0° 10°
Millimeters
Min Max
.90 1.45
.00 .15
.20 .50
.08 .25
2.70 3.10
1.50 1.80
.95 BSC
1.90 BSC
2.20 3.20
.10 .60
0° 10°
Notes
Notes:
1. Package outline exclusive of mold flash &
metal burr.
2. Package outline exclusive of solder plating.
3. EIAJ Ref Number SC_74A
REV. 1.0.2 6/22/04
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet FAN5307SX.PDF ] | |
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