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PDF FAN5355 Datasheet ( Hoja de datos )

Número de pieza FAN5355
Descripción 3MHz Digitally Programmable TinyBuckTM Regulator
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo

Total 27 Páginas
		
FAN5355 Hoja de datos, Descripción, Manual
March 2008
www.datasheet4u.com
FAN5355
1A / 0.8A, 3MHz Digitally Programmable TinyBuckTM Regulator
Features
ƒ 91% Efficiency at 3MHz
ƒ 800mA or 1A Output Current(1)
ƒ 2.7V to 5.5V Input Voltage Range
ƒ 6 or 7-bit VOUT Programmable from 0.75 to 1.975V
ƒ 3MHz Fixed-Frequency Operation
ƒ Excellent Load and Line Transient Response
ƒ Small Size, 1μH Inductor Solution
ƒ ±2% PWM DC Voltage Accuracy
ƒ 35ns Minimum On-Time
ƒ High-Efficiency, Low-Ripple, Light-Load PFM
ƒ Smooth Transition between PWM and PFM
ƒ 37μA Operating PFM Quiescent Current
ƒ Software Selectable 25kHz Minimum PFM Frequency
Prevents Audible Noise in PFM Mode
ƒ I2C™-Compatible Interface up to 3.4Mbps
ƒ Pin-Selectable or I2C™ Programmable Output Voltage
ƒ On-the-Fly External Clock Synchronization
ƒ 10-lead MLP (3 x 3mm) or 12-bump CSP Packages
Applications
ƒ SmartReflex™-Compliant Power Supply
ƒ Split Supply DSPs and μP Solutions OMAP™, XSCALE™
ƒ Cell Phones, Smart Phones, PDAs, Digital Cameras, and
Portable Media Players
ƒ Micro DC-DC Converter Modules
ƒ Handset Graphic Processors (NVIDIA®, ATI)
I2C is a trademark of Philips Corporation.
SmartReflex and OMAP are trademarks of Texas Instruments.
XSCALE is a trademark of Intel Corporation.
NVIDIA is a registered trademark of NVIDIA Corporation.
Description
The FAN5355 device is a high-frequency, ultra-fast transient
response, synchronous step-down DC-DC converter
optimized for low-power applications using small, low-cost
inductors and capacitors. The FAN5355 supports up to
800mA or 1A(1) load current.
The device is ideal for mobile phones and similar portable
applications powered by a single-cell Lithium-Ion battery. With
an output voltage range adjustable via I2C™ interface from
0.75V to 1.975V, the device supports low-voltage DSPs and
processors, core power supplies in smart phones, PDAs, and
handheld computers.
The FAN5355 operates at 3MHz (nominal) fixed switching
frequency using either its internal oscillator or external SYNC
frequency.
During light-load conditions, the regulator includes a PFM
mode to enhance light-load efficiency. The regulator
transitions smoothly between PWM and PFM modes with no
glitches on VOUT. Normal PFM (NPFM) mode offers the lowest
quiescent current, at the expense of setpoint accuracy.
Enhanced PFM (EPFM) mode features higher accuracy, as
well as a 25kHz minimum PFM frequency, designed to
prevent the regulator from operating in the audible range. In
shutdown, the current consumption is reduced to less than
2μA, using software shutdown (EN = 1 with EN_DCDC = 0),
and less than 200nA in hardware shutdown (EN = 0).
The serial interface is compatible with Fast/Standard and
High-Speed mode I2C specifications, allowing transfers up to
3.4Mbps. This interface is used for dynamic voltage scaling
with 12.5mV voltage steps, for reprogramming the mode of
operation (PFM or Forced PWM), or to disable/enable the
output voltage.
The chip's advanced protection features include short-circuit
protection and current and temperature limits. During a
sustained over-current event, the IC shuts down and restarts
after a delay to reduce average power dissipation into a fault.
During start-up, the IC controls the output slew rate to
minimize input current and output overshoot at the end of soft-
start. The IC maintains a consistent soft-start ramp, regardless
of output load during start-up.
The FAN5355 is available in 10-lead MLP (3x3mm) and
12-bump CSP packages.
© 2008 Fairchild Semiconductor Corporation
FAN5355 • Rev. 1.0.4
www.fairchildsemi.com

1 page

FAN5355 pdf
Electrical Specifications
VIN = 3.6V, EN = VIN, VSEL = VIN, SYNC = GND, VSEL0(6) bit = 1, CONTROL2[4:3] = 00. TA = -40°C to +85°C, unless otherwise
noted. Typical values are at TA = 25°C. Circuit and components according to Figure 1.
www.daStaysmhebeot4lu.coPmarameter
Conditions
Min. Typ. Max. Units
Power Supplies
VIN Input Voltage Range
IQ Quiescent Current
I SD Shutdown Supply Current
VUVLO
Under-Voltage Lockout Threshold
VUVHYST Under-Voltage Lockout Hysteresis
ENABLE, VSEL, SDA, SCL, SYNC
IO = 0mA, EPFM Mode, FPFM = 25kHz
IO = 0mA, NPFM Mode
IO = 0mA, 3MHz PWM Mode
EN = GND
EN = VIN, EN_DCDC bit = 0,
SDA = SCL = VIN
VIN Rising
VIN Falling
2.7 5.5
110 150
37 50
4.8
0.1 2.0
0.1 2.0
2.00
200
2.40
2.15
250
2.60
2.30
300
V
μA
μA
mA
μA
V
V
mV
VIH HIGH-Level Input Voltage
VIL LOW-Level Input Voltage
IIN Input Bias Current
Power Switch and Protection
Input tied to GND or VIN
1.2
0.4
0.01 1.00
V
V
μA
RDS(ON)P
ILKGP
RDS(ON)N
ILKGN
RDIS
P-channel MOSFET On Resistance
P-channel Leakage Current
N-channel MOSFET On Resistance
N-channel Leakage Current
Discharge Resistor for Power-down
Sequence
VIN = 3.6V, CSP Package
VIN = 3.6V, MLP Package
VIN = 2.7V, MLP Package
VDS = 6V
VIN = 3.6V, CSP Package
VIN = 3.6V, MLP Package
VIN = 2.7V, MLP Package
VDS = 6V
Options 03, 06, 07
145
165
200
1
75
95
101
1
15 50
m
μA
m
μA
2.7V VIN 4.2V, All Options Except 06
and 07
1150
1350 1600
ILIMPK
P-MOS Current Limit
2.7V VIN 5.5V, All Options Except 06
and 07
1050
1350 1600
mA
TLIMIT
Thermal Shutdown
THYST
Thermal Shutdown Hysteresis
Frequency Control
2.7V VIN 4.2V, 06 and 07 Option
1300
1550
150
20
1800
°C
°C
fSW
fSYNC
DSYNC
fSYNCVAL
fPFM(MIN)
Oscillator Frequency
Synchronization Range
Synchronization Duty Cycle
SYNC Frequency Rejection
Minimum PFM Frequency
EPFM Mode, ILOAD = 0
2.65 3.00 3.35
2.7 3.0 3.3
20 80
1.6 4.3
25
MHz
MHz
%
MHz
kHz
Continued on the following page…
© 2008 Fairchild Semiconductor Corporation
FAN5355 • Rev. 1.0.4
5
www.fairchildsemi.com

5 Page

FAN5355 arduino
Typical Performance Characteristics
Unless otherwise specified, Auto-PWM/NPFM, VIN = 3.6V, TA = 25°C, and recommended components as specified in Table 1.
www.datash1e.e0t644u.com
1.062
1.060
1.058
1.056
1.054
Auto PWM/NPFM
Forced PWM
1.052
1.050
1.048
1
10 100
I LOAD Output Current (mA)
Figure 10. Load Regulation at VOUT = 1.05V
1000
70
65
60
55
50
45
VSEL = 1.8V
VSEL = 0V
40
35
30
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN Input Voltage (V)
Figure 12. Quiescent Current, ILOAD = 0, EN = 1.8V
0.10%
0.05%
0.00%
-0.05%
-0.10%
-0.15%
-0.20%
-0.25%
VIN = 2.7V
VIN = 3.6V
VIN = 5.5V
-0.30%
-40 -20 0 20 40 60 80
Temperature (C)
Figure 14. % VOUT Shift vs. Temperature (Normalized)
1.364
1.362
1.360
1.358
1.356
1.354
Auto PWM/NPFM
Forced PWM
1.352
1.350
1.348
1
10 100
I LOAD Output Current (mA)
Figure 11. Load Regulation at VOUT = 1.35V
1000
6.0
5.0
VSEL = 1.8V
4.0 VSEL = 0V
3.0
2.0
1.0
-
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN Input Voltage (V)
Figure 13. Shutdown Current, ILOAD = 0, EN = 0
230
210
190
170
150
130
110 P-Channel
90 N-Channel
70
50
30
2 2.5 3 3.5 4 4.5 5 5.5
VIN Input Voltage (V)
Figure 15. Output Stage RDS(ON) vs. VIN
© 2008 Fairchild Semiconductor Corporation
FAN5355 • Rev. 1.0.4
11
www.fairchildsemi.com

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