FAN5340MTC [FAIRCHILD]
Switching Regulator/Controller, Voltage-mode, BIPolar, PDSO20;
| 型号： | FAN5340MTC |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Switching Regulator/Controller, Voltage-mode, BIPolar, PDSO20 光电二极管 |
| 文件： | 总12页 (文件大小：116K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN5340
Four Channel Controller for Switching Regulator
Features
Description
• 2.5V to 7.5V Input Voltage Range
The FAN5340 is a flexible voltage-mode four-channel
switching regulator, consuming very low quiescent current.
The four channels can be configured to operate either as
buck, boost, sepic, or inverting converters. Mode selection is
achieved by connecting the SEL pin to VIN, GND, or left
floating for boost/sepic, inverter and buck operation respec-
tively. The controller outputs are suitable to drive external
bipolar transistors, P-ch or N-ch MOSFET.
• Four Independent PWM/PFM Channels
• Four Independent Enable Controls
• Four Independent Built-in Soft Start Functions
• Drives MOSFET or BIPOLAR Power Switch
• Channels are Configurable as Buck, Boost, Inverting, or
Sepic Converters
• 500µA Quiescent Current (Typ.)
• Supply Current in Off Mode is less than 3µA
• 500kHz Clock
• Independent On/Off Control for Each Channel
• Short Circuit Protection for Buck and Inverter
The device has very low quiescent current, which makes it
ideally suitable for portable electronic equipment.
The FAN5340 is available in a 20-lead TSSOP package.
Applications
• Digital Still Cameras
• PDAs
• Handheld Equipment
Typical Application
V
IN
V
IN
C
IN
C
IN
500KΩ
SEL
V
IN
EN
FB
SEL
V
IN
EN
FB
O
R2
R1
Cf
C
OUT
O
500KΩ
R2
R1
Cf
C
OUT
Boost Converter
Buck Converter
V
IN
V
IN
C
IN
500KΩ
C
IN
SEL
V
IN
EN
L1
SEL
-ve output voltage
V
IN
EN
REF
FB
O
-ve output voltage
R2
R2
C
R1
Cf
O
Cf
C
L2
OUT
OUT
500KΩ
R1
FB
REF(1.25V )
Inverting Buck/Boost Converter
Sepic Converter (Non-Inverting Buck/Boost)
REV. 1.0.0 10/7/03
FAN5340
PRODUCT SPECIFICATIONS
Pin Assignment
TOP VIEW
ENb
ENa
ENc
ENd
REF
GND
Oc
NC
VIN
Oa
SELc
FBc
FBd
Od
SELa
FBa
FBb
Ob
SELb
SELd
FAN5340
20-Lead TSSOP
Pin Description
Pin No.
1
Pin Name
Pin Description
ENc
ENd
REF
GND
Oc
Enable Pin of Regulator c
Enable Pin of Regulator d
2
3
Auxiliary Reference Voltage Output
System Ground
4
5
Output (Gate Drive) of Regulator c
Select Pin for Channel c
6
SELc
FBc
FBd
Od
7
Feedback Voltage of Regulator c
Feedback Voltage of Regulator d
Output (Gate Drive) of Regulator d
Select Pin for Channel d
8
9
10
11
12
13
14
15
16
17
18
19
20
SELd
SELb
Ob
Select Pin for Channel b
Output (Gate Drive) of Regulator b
Feedback Voltage of Regulator b
Feedback Voltage of Regulator a
Select Pin for Channel a
FBb
FBa
SELa
Oa
Output (Gate Drive) of Regulator a
Input Power Supply
VIN
NC
No Connection
ENa
ENb
Enable Pin of Regulator a
Enable Pin of Regulator b
2
REV. 1.0.0 10/7/03
PRODUCT SPECIFICATIONS
FAN5340
Absolute Maximum Ratings (Note1)
Parameter
Min
-0.3
-0.3
Max
9
Unit
V
VIN to GND
FB, EN, SEL, O, REF to GND
Lead Soldering Temperature (10 seconds)
Junction Temperature
VIN + 0.3
300
V
°C
°C
°C
W
150
Storage Temperature
-55
150
Maximum Continuous Power Dissipation
Electrostatic Discharge Protection (ESD) Level (Note 3)
1
HBM
CDM
4
1
kV
Recommended Operating Conditions
Parameter
Min
2.5
-40
Typ
Max
7.5
85
Unit
V
Input Voltage
Operating Ambient Temperature
25
°C
Notes:
1. Operation beyond the absolute maximum rating may cause permanent damage to device.
2. Applies to all four switching regulator device outputs.
3. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
REV. 1.0.0 10/7/03
3
FAN5340
PRODUCT SPECIFICATIONS
DC Electrical Characteristics
Unless otherwise noted, VIN = 5V, TA = -40°C to +85°C, Typical values are at TA = 25°C
Parameter
Conditions
Min.
Typ.
Max.
Units
Quiescent Current (Note 4)
VIN = 5V, One channel enabled, no
load on all channels
500
µA
V
IN = 5V, All channels enabled,
800
1
no load on any output
VIN = 5V, No load on any output
VIN = 7.5V
Supply Current, Off Mode
Feedback Voltage
REF Voltage
3
µA
10
FB Current = 0.1µA
(Typical)
TA = 25ºC
0.61
0.60
1.19
1.17
0
0.63
0.65
0.66
1.28
1.3
V
V
Load on REF Pin < 1mA
TA = 25ºC
1.235
V
V
Enable Voltage
Device Shutdown
Device Enabled
EN = High
0.5
V
1.7
VIN
V
Enable Pin Sink Current
Enable Pin Source Current
SEL Pin Sink Current
1
1
µA
µA
µA
µA
EN = Low, VIN > 6V
SEL = High
12
10
SEL Pin Source Current
Output Drivers a, b, c, and d:
SEL = Low
Output Source Current Io+
(Note 2)
Device Enabled
15
20
20
40
mA
(VIN =2.5V, VOUT = 0V)
Device in Shutdown mode
5
5
µA
Output Sink Current Io-
(Note 2)
Device Enabled
(VIN =2.5V, VOUT = 2.5V)
mA
Device in Shutdown mode
µA
Oscillator
Oscillator Frequency
Maximum Duty Cycle
500
75
kHz
%
Notes:
4. No load supply current is measured with the oscillator running.
4
REV. 1.0.0 10/7/03
PRODUCT SPECIFICATIONS
FAN5340
Typical Performance Characteristics
TA = 25°C, unless otherwise noted.
Output Voltage vs Load Current
Output Voltage vs Input Voltage
Buck Mode
Buck Mode
1.190
1.35
1.30
1.25
1.185
V
IN
= 4V
1.180
1.175
1.170
1.165
1.160
1.155
1.150
1.20
1.15
1.10
1.05
No Load
I
= 100mA
load
0
20
40
60
80
100
120
2
3
4
5
6
Load Current (mA)
Input Voltage (V)
Output Voltage vs Load Current
Boost Mode
Output Voltage vs Input Voltage
Boost Mode
16.0
15.6
15.4
15.8
15.6
15.4
15.2
15.0
14.8
14.6
14.4
14.2
14.0
V
= 5V
IN
15.2
I
= 100mA
load
15.0
14.8
14.6
14.4
No Load
0
5
10
15
20
25
30
2
3
4
5
6
Input Voltage (V)
Load Current (mA)
Ground Current vs Ambient Temperature
Ground Current vs Input Voltage
1000
1.8
1.6
1.4
All Channels Enabled
All Channels Enabled
900
800
700
600
500
400
300
T
LOAD
= 25°C
A
V
IN
= 3V
I
= 100µA
I
= 100µA
LOAD
1.2
1.0
0.8
0.6
0.4
-40
-20
0
20
40
60
80
100
2
4
6
8
10
Ambient Temperature (°C)
Input Voltage (V)
REV. 1.0.0 10/7/03
5
FAN5340
PRODUCT SPECIFICATIONS
Typical Performance Characteristics (Continued)
TA = 25°C, unless otherwise noted.
Shutdown Current vs Ambient Temperature
Shutdown Current vs Input Voltage
3.0
2.5
2.0
1.5
1.0
6
5
4
3
2
T
= 25°C
A
V
= 3V
IN
0.5
0.0
1
0
-40
-20
0
20
40
60
80
100
4
5
6
7
8
9
10
Ambient Temperature (°C)
Input Voltage (V)
Output Sink Current vs
Ambient Temperature
Output Source Current vs
Ambient Temperature
160
150
140
130
120
110
100
70
65
60
55
50
45
40
V
IN
= 5V
V
= 5V
IN
90
80
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Ambient Temperature (°C)
Ambient Temperature (°C)
6
REV. 1.0.0 10/7/03
PRODUCT SPECIFICATIONS
FAN5340
Block Diagram
REG
FBa
ENa
Oa
ENb
SELa
SELb
V
IN
GND
SEL
A
SEL
B
EN
EN
OSC
FB
O
Ob
O
OSC
FB
REGULATOR
OSCILLATOR
FBb
ENc
EN
D
EN
C
OSC
OSC
FB
O
FB
O
Oc
SEL
SEL
FBc
REG
SELc
Od
ENd
FBd SELd
Functional Block Diagram
V
REF
SOFT-START
TIMER
REGULATOR
OSCILLATOR
SHORT-CIRCUIT
DETECTION
FB
DISABLE
SEL
MODE SELECTION
REF
FB
PWM
GENERATOR
O
DRIVER
FB
-
-
REF
+
+
CONTROLLER BLOCK
In discontinuous conduction mode, the pulse width gener-
ated by the internal PWM generator depends on various fac-
tors such as input/output conversion ratio and the output
load.
Circuit Description
The FAN5340 has four independent channels for regulating
up to four voltages. Each channel compares the feedback
voltage with an internal reference voltage. If the feedback
voltage is less than the reference voltage, internally gener-
ated PWM pulses drive the external switch to bring output to
regulation. As soon as the feedback voltage reaches the
internal reference, the PWM pulses are disabled and the con-
troller enters “pulse skipping” mode and remains in that
mode until feedback voltage falls below the reference volt-
age.
Buck Mode
In the discontinuous mode of operation, for a buck controller
the conversion ratio is given by:
VOUT
2
------------- = ----------------------------------------------
VIN
1 + 1 + 4 × K ⁄ D2
As described above, the controller uses “PWM pulses” to
reach regulation and enters “pulse skipping” when the output
is in regulation. For proper regulation of the output, the com-
ponent values need to be selected to ensure discontinuous
conduction mode (DCM).
Where D = Duty Cycle and
2 × L
----------------
K =
× Clock Frequency
RLOAD
REV. 1.0.0 10/7/03
7
FAN5340
PRODUCT SPECIFICATIONS
The input-output relationship is shown in the figure below.
The input-output relationship is shown in the figure below.
Voltage Conversion Ratio vs Duty Cycle
Voltage Conversion Ratio vs Duty Cycle
5
1.2
K = 0.01
1.0
4
K = 0.05
0.8
0.6
K = 0.01
3
D
= 0.75
MAX
0.4
0.2
0.0
2
D
= 0.75
MAX
K = 0.1
K = 0.1
1
K = 0.5
0
0.00
0.25
0.50
0.75
1.00
0.0
0.2
0.4
0.6
0.8
1.0
Duty Cycle “D”
Duty Cycle “D”
Voltage conversion ratio M (D, K) - Buck Converter
Voltage conversion ratio M (D, K) - Boost Converter
For proper regulation:
2 × L
The inductor value is selected by maximum load current
required, and is given by:
----------------
× Clock Frequency < 1 – DMAX
RLOAD
0.075 × RMIN
2 × Clock Frequency
-------------------------------------------------
L <
--------------------------- (2)
Where DMAX for the controller is 3/4.
The inductor value is selected based on maximum load cur-
rent required, and is given by:
VOUT(NOM)
where RMIN = ----------------------------
ILOAD(MAX)
R
-----------------------M-----I-N--------------------
Inverter Mode
The conversion ratio is:
L <
----------------------------- (1)
8 × Clock Frequency
VOUT
–D
VOUT(NOM)
ILOAD(MAX)
------------- = -------
where RMIN = ----------------------------
VIN
K
Selecting a very small inductor value increases the ripple and
peak currents.
Where D = Duty Cycle and
2 × L
------------
K =
× Clock Frequency
Boost Mode
R
In the discontinuous conduction mode (DCM), the conver-
sion ratio is:
For proper regulation:
1 + 1 + 4 × D2 ⁄ K
VOUT
2 × L
9
6
------------- = ----------------------------------------------
-------------
--
× Clock Frequency < (approx.)
VIN
2
RLoad
and
Where D = Duty Cycle and
RMIN
9
----- ----------------------------------------
L <
×
-------------------------- (3)
2 × L
32 Clock Frequency
----------------
K =
× Clock Frequency
RLOAD
VOUT(NOM)
where RMIN = ----------------------------
ILOAD(MAX)
For proper regulation:
2 × L
----------------
× Clock Frequency < 0.075 (Approx.)
RLOAD
8
REV. 1.0.0 10/7/03
PRODUCT SPECIFICATIONS
FAN5340
For a step-up application, the short circuit current is not lim-
ited due to a DC current path from inductor and output
through the diode. For this mode, a protection device such as
a fuse must be used to limit short-circuit current.
SEPIC Mode
From the “Voltage conversion ratio M (D, K) - Buck Converter
figure, since the duty cycle “D” is limited to 0.75, it is diffi-
cult to get VOUT ⁄ VIN > 0.75 for heavy loads.
”
Setting the Output Voltage
Output voltage is given approximately by
R2
Similarly, for boost mode from “Voltage conversion ratio
M (D, K) - Boost Convert” figure, it is difficult to achieve regu-
lation at light loads if VOUT ⁄ VIN < 2 .
VOUT = 0.630 × 1 + -----
R1
For the 0.75 < VOUT ⁄ VIN < 2 conversion range, SEPIC
mode is recommended. For DCM (Discontinuous Conduc-
tion Mode) operation:
R2
-----
R2
or VOUT = –
(1.235) – 0.630 × 1 + -----
R1
R1
1
The resistor divider R1and R2 from output should be selected
based on the above relation.
--------------------------------------------------------------------------------
L1 <
× RMIN ----- (4)
2 × Clock Frequency × (M2 + M)
1
Application Information
---------------------------------------------------------------------------
and L2 <
× RMIN ---- (5)
2 × Clock Frequency × (M + 1)
Capacitor Selection
VOUT VOUT(NOM)
The output capacitor type and value affect the voltage ripple.
Low ESR ceramic capacitors in the range of 10µF to 22µF
are recommended. Higher output capacitor values are recom-
mended for lower ripple. However increasing the output
capacitor can result in a frequency spectrum with compo-
nents in the audio range. To filter out the high frequency ESR
spikes additional ESR filter can be used at the output.
where M = ------------- and RMIN = ----------------------------
VIN ILOAD(MAX)
Soft-Start
The FAN5340 features a built-in independent soft-start func-
tion for each controller that limits inrush current by ramping
the reference voltage to the final value in approximately 300
clock cycles at power-up/enable.
The input capacitor reduces the current peaks drawn from
the battery or input power source and lessens switching noise
in the controller. The impedance of the input capacitor at the
clock frequency should be less than that of the input source
so that the high frequency switching currents do not pass
through the input source. A ceramic capacitor of a minimum
10µF should be placed close to the switching transistor of
each power supply.
However, for the boost mode of operation, even though the
MOS switch is disabled, the inductor charges the output
capacitor until VOUT is approximately one diode drop less
than VIN. The inrush current during that duration depends on
the inductor and output capacitor values.
Short-Circuit Protection
At the end of soft start, if VOUT < 0.1 x VOUT_Nominal at any
time, the controller disables the pulses to external device. To
restart the pulses, VIN or enable needs to be recycled.
To improve the efficiency in a Boost/Sepic configuration, it
is recommended to connect 500pF capacitor between VOUT
and FB.
The FAN5340 has a built-in soft-start with internal capaci-
tors for each controller. The soft-start interval is 300 clock
cycles. The Soft-start interval starts, when VIN reaches
approximately 1.6V. For slow ramping VIN at power-up and
if the MOSFET threshold is greater than 1.6V, it is recom-
mended to enable the chip only after VIN has settled to its
final value to avoid false fault detection. If enable and VIN
are applied to the chip without delay, placing a RC network
between VIN and the enable pin will avoid the false fault
MOSFET Selection
The peak current through the MOSFET is:
VIN × DMAX
IPeak = ------------------------------
L
3
where DMAX = --
4
detection for slow ramping VIN
.
REV. 1.0.0 10/7/03
9
FAN5340
PRODUCT SPECIFICATIONS
The MOSFET should be rated to handle this peak current
and the MOSFET’s RDS-ON should be as low as possible.
Small gate capacitances are recommended as they decrease
the output ripple and increase the efficiency.
Inductor Selection
The inductor value should be selected based on equations (1)
to (5). The inductor should be rated to handle peak currents
of Ipeak = 3 ⁄ 4 × VIN ⁄ L . Low DC resistance inductors are
recommended.
MOSFET threshold should be lower than the minimum VIN
as the output swing from the controller is limited to VIN. It is
recommended to have a VDS MAX = 2 × V, where “V” is the
Designing a PC Board
A good PC board layout is important to achieve optimal per-
formance from the FAN5340. Poor PCB design can cause
excessive conducted and/or radiated noise, both of which can
cause instability and/or regulation errors.
greater of VIN or VOUT
.
Diode Selection
Schottky diodes are recommended for low output voltage
applications because of the low forward-voltage and fast
recovery time. Schottky diodes exhibit significant leakage at
high reverse-voltages and high temperatures. Thus, for high-
voltage, high-temperature applications, use ultra-fast junc-
tion rectifiers.
Conductors carrying discontinuous currents (MOSFETS,
inductor, output capacitors) should be kept as short and as
wide as possible. The power switch loop and the output recti-
fier loop should be laid out for minimum length. A separate
low-noise ground plane containing chip ground and refer-
ence grounds should connect only to the power-ground plane
at one point to minimize the effects of power-ground cur-
rents.
Snubber Circuit
A snubber circuit is recommended to protect the MOSFET
from voltage spikes, for very high boost voltages or inverter
voltages.
Boost Converter Precaution
For slow ramping VIN (dV ⁄ dt < 50V ⁄ S ), it is recom-
mended to connect the Enable pin to VIN via 500KΩ resistor
to avoid a high current state at VIN = 1.8V.
Transient Response
For improved transient response, it is recommended to have
a capacitor in parallel with R2. The impedance of capacitor
should be less than R2 at the transient frequency.
10
REV. 1.0.0 10/7/03
PRODUCT SPECIFICATIONS
FAN5340
Mechanical Dimensions
20-Lead TSSOP Package
Package MTC20
6.5 0.1
–A–
0.20
20
11
–C–
4.16
7.72
–B–
6.4
4.4 0.1
1.78
3.2
0.42
0.2
C B A
0.65
ALL LEAD TIPS
10
1
Pin #1 IDENT.
LAND PATTERN RECOMMENDATION
0.1
C
SEE DETAIL A
+0.15
0.90
ALL LEAD TIPS
-0.10
1.2 max
–C–
0.1 0.05
0.09–0.20
0.65
0.19–0.30
12.00°
0.10 M
A B S D S
R0.09min
GAGE PLANE
DIMENSIONS ARE IN MILLIMETERS
0 – 8°
0.25
Notes:
SEATING PLANE
0.6 0.1
A. CONFORMS TO JEDEC REGISTRATION MO-153, VARIATION AC,
REF NOTE 6, DATE 7/93.
R0.09min
1.00
B. DIMENSIONS ARE IN MILLIMETERS.
C. DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLDS FLASH,
AND TIE BAR EXTRUSIONS.
DETAIL A
D. DIMENSIONS AND TOLERANCES PER ANSI Y14.5M, 1982.
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC20
REV. 1.0.0 10/7/03
11
FAN5340
PRODUCT SPECIFICATIONS
Ordering Information
Product Number
Package Type
Order Code
FAN5340
20-Lead TSSOP- Tape and reel
20-Lead TSSOP- Tubes
FAN5340MTCX
FAN5340MTC
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY 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 WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
REV. 1.0.0 10/7/03
2002 Fairchild Semiconductor Corporation
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