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부품번호 FAN5355 기능
기능 3MHz Digitally Programmable TinyBuckTM Regulator
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FAN5355 데이터시트, 핀배열, 회로
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




FAN5355 pdf, 반도체, 판매, 대치품
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above
the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended
www.daeatrxaepshosestreuetr4sesu.trcoaotmsintrgesssoenslya. bove the recommended operating conditions may affect device reliability. The absolute maximum ratings
Symbol Parameter
AVIN, SW, PVIN Pins
VCC Other Pins
ESD
Human Body Model per JESD22-A114
Electrostatic Discharge Protection Level
Charged Device Model per JESD22-C101
TJ Junction Temperature
TSTG
Storage Temperature
TL Lead Soldering Temperature, 10 Seconds
Note:
8. Lesser of 6.5V or VCC+0.3V.
Min.
-0.3
-0.3
–40
–65
Max.
6.5
AVIN + 0.3(8)
3.5
1.5
+150
+150
+260
Units
V
V
KV
KV
°C
°C
°C
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating
conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding
them or designing to absolute maximum ratings.
Symbol Parameter
Min.
Max.
Units
VIN Supply Voltage
f Frequency Range
VSW SDA and SCL Voltage Swing(9)
TA Ambient Temperature
TJ Junction Temperature
2.7 5.5
V
2.7 3.3 MHz
2.5 V
–40 +85
°C
–40 +125
°C
Note:
9. The I2C interface operates with tHD;DAT = 0 as long as the pull-up voltage for SDA and SCL is less than 2.5V. If voltage
swings greater than 2.5V are required (for example if the I2C bus is pulled up
increased to 80ns. Most I2C masters change SDA near the midpoint between
to VIN), the minimum
the falling and rising
tHD;DAT
edges
must be
of SCL, which
provides ample tHD;DAT .
Dissipation Ratings(10)
Package
Molded Leadless Package (MLP)
RθJA(11)
49ºC/W
Power Rating at TA 25°C
2050mW
Derating Factor > TA = 25ºC
21mW/ºC
Wafer-Level Chip-Scale Package (WLCSP)
110ºC/W
900mW
9mW/ºC
Notes:
10. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any
allowable ambient temperature is PD = [TJ(max) - TA ] / θJA.
11. This thermal data is measured with high-K board (four-layer board according to JESD51-7 JEDEC standard).
© 2008 Fairchild Semiconductor Corporation
FAN5355 • Rev. 1.0.4
4
www.fairchildsemi.com

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FAN5355 전자부품, 판매, 대치품
Electrical Specifications (Continued)
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.datasheet4u.com
Symbol Parameter
Conditions
Min. Typ. Max. Units
DAC
Resolution
Timing
I2CEN
Differential Nonlinearity
EN HIGH to I2C Start
tV(L-H)
VOUT LOW to HIGH Settling
Soft-Start
Option 07
7 Bits
All Other Options
6 Bits
Monotonicity Assured by Design
0.8 LSB
RLOAD = 75Ω, Transition from 1.0 to 1.5375V
VOUT Settled to within 2% of Setpoint
250
7
μs
μs
Regulator Enable Option 06
RLOAD > 5Ω, to VOUT = 1.8000V
tSS to Regulated
VOUT
All Other
Options
RLOAD > 5Ω, to VOUT = Power-up Default
VSLEW
Soft-start VOUT Slew Rate(12)
Note:
12. Option 06 slew rate is 35.5V/ms during the first 16μs of soft-start.
170
140
18.75
210
180
μs
μs
V/ms
AVIN
EN
VSEL
SYNC
SDA
SCL
I2C
INTERFACE
AND LOGIC
3 MHz Osc
7-bit
DAC
REF
SOFT START
FPWM
EN_REG
CLK
MODULATOR
Q1
Q2
Figure 4. Block Diagram
PVIN
VIN
CIN
SW
L OUT
VOUT
COUT
PGND
VOUT
AGND
© 2008 Fairchild Semiconductor Corporation
FAN5355 • Rev. 1.0.4
7
www.fairchildsemi.com

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