Fairchild FAN4603MM18X 600ma, fully integrated, buck power supply module Datasheet

FAN4603
600mA, Fully Integrated, Buck Power Supply Module
Features
Description
ƒ
Solder and Play DC/DC Converter;
No External Components Required
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ƒ
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Up to 91% Efficiency
The FAN4603 is a fully integrated synchronous DC/DC buck
converter that provides up to 600mA of output current over an
input voltage ranging from 2.3V to 5.5V. It provides a fixed
output voltage level ranging from 1.0V to 1.8V. Other voltage
options are available on request.
ƒ
ƒ
4.0 x 2.5mm MLP Package
600mA Output Current Capability
The FAN4603 converter is offered as an ultra-miniature
“Solder and Play” solution that requires no external
components and is able to achieve a DC accuracy of ±2%
PWM and an output ripple less than 12mV.
2.3V to 5.5V Input Voltage Range
Fixed Output Voltages from 1.0V to 1.8V
35µA PFM Quiescent Current
Best-in-Class Load and Line Transient Response
±2% PWM DC Voltage Accuracy
No External Components Required
High-Efficiency, Low-Ripple, Light-Load PFM
Thermal Shutdown (TSD), Under-Voltage Lockout,
(UVLO), and Short-Circuit (SCP) Protection
Total footprint is 4.0 x 2.5mm with a maximum height of
1.1mm. It can be used in small battery-powered devices and
applications with distributed DC POL requirements.
At moderate and light loads, pulse frequency modulation is
used to operate the device in power-save mode with a typical
quiescent current of 35µA. Even with such a low quiescent
current, the part exhibits excellent transient response during
large load swings. At higher loads, the system automatically
switches to fixed-frequency control.
In shutdown mode, the supply current drops below 2µA,
reducing power consumption.
Maximum Height: 1.1mm
Applications
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ƒ
ƒ
POL and Distributed DC-DC Module Applications
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Wireless Cards, Meters, Hearing Aids, Bluetooth
Headsets, POS Equipment, VOIP, PDAs, MIDs,
Netbooks, and Servers
Small Form Factor, Battery-Powered Applications
POL Core Power for FPGA, DSP, CPU, and GPU with
Fast-Transient, Wide Dynamic Load Requirements
Ordering Information
Part Number
(1)
Output Voltage
FAN4603MM18X
1.82V
FAN4603MM15X
1.5V
FAN4603MM13X
1.3V
FAN4603MM12X
1.23V
FAN4603MM10X
1.0V
Package
Temperature Range
Packing
6-Lead Molded Leadless Package (MLP),
4 x 2.5 x 1mm
–40 to 85°C
Tape and
Reel
Note:
1. Other voltage options are available on request. Contact a Fairchild representative.
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
www.fairchildsemi.com
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
August 2010
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
Typical Application
Figure 1. Typical Application
Pin Configuration
Figure 2. MLP 4.0 x 2.5 mm (Top View)
Figure 3. 3D Package View
Pin Definitions
Pin #
Name
Description
1
VIN
Input Voltage. Connect to input power source
2
EN
Enable. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.2V.
Do not leave this pin floating.
3
SW
Switching Node. Leave this pin floating.
4
VOUT
5
FB
6
GND
Ground. Power and IC ground. All signals are referenced to this pin.
P1
GND
Optional Ground Connection. Not typically used.
Output Voltage. Connect to Load.
Feedback/VOUT. This pin must be shorted directly to VOUT (Pin 4).
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
www.fairchildsemi.com
2
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
exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings
are stress ratings only.
Symbol
Min.
Max.
Units
Input Voltage with Respect to GND
-0.3
6.0
V
Voltage on Any Other Pin with Respect to GND
-0.3
VIN
V
TJ
Junction Temperature
-40
+150
°C
TSTG
Storage Temperature
-65
+150
°C
+260
°C
VIN
TL
ESD
Parameter
Lead Temperature (Soldering, 10 Seconds)
Electrostatic Discharge
Capability
Human Body Model JESD22-A114
6
Charged Device Model, JESD22-C101
2
kV
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
VCC
Supply Voltage Range
IOUT
Output Current
Min.
Max.
Units
2.3
5.5
V
0
600
mA
TA
Operating Ambient Temperature
-40
+85
°C
TJ
Operating Junction Temperature
-40
+125
°C
Thermal Properties
Symbol
ΘJA
Parameter
Junction-to-Ambient Thermal Resistance
(2)
Typical
Units
120
°C/W
Note:
2. Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with a twolayer 2s0p board in accordance to the JESD51- JEDEC standard. Special attention must be paid not to exceed junction
temperature TJ(max) at a given ambient temperature TA.
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
www.fairchildsemi.com
3
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
Absolute Maximum Ratings
Unless otherwise noted, VIN = 2.5 to 5.5V, EN = VIN. TA = -40°C to +85°C, using circuit of Figure 1. Typical values are at
3.6VIN, TA = 25°C.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
35
55
µA
Power Supplies
IQ
Quiescent Current
ISD
Shutdown Supply Current
VIN = 3.6V, EN = GND
0.1
2.0
µA
VUVLO
Under-Voltage Lockout Threshold
Rising VIN
2.15
2.25
V
VUVHYST
Under-Voltage Lockout Hysteresis
VENH
Enable HIGH-Level Input Voltage
VENL
Enable LOW-Level Input Voltage
150
mV
1.05
V
0.4
VEN_HYS
Enable Logic Input Hysteresis
100
IEN
Enable Input Leakage Current
EN = VIN or GND
Oscillator Frequency(3)
PWM Mode
V
mV
0.01
1.00
µA
5.4
6.0
6.6
MHz
ILOAD = 0 to 600mA
1.784
1.820
1.890
PWM Mode
1.784
1.820
1.856
ILOAD = 0 to 600mA
1.470
1.500
1.560
PWM Mode
1.470
1.500
1.530
ILOAD = 0 to 600mA
1.274
1.300
1.352
PWM Mode
1.274
1.300
1.326
ILOAD = 0 to 600mA
1.207
1.233
1.283
PWM Mode
1.207
1.233
1.260
ILOAD = 0 to 600mA
0.975
1.000
1.050
PWM Mode
0.975
1.000
1.025
180
300
µs
1050
1250
mA
Oscillator
fOSC
Regulation
1.82V
1.50V
VO
Output Voltage Accuracy
1.30V
1.23V
1.00V
tSS
Soft-Start Time
Rising EN to VOUT Regulation
V
Protection
ILIM
Peak Input Current Limit
850
TTSD
Thermal Shutdown
+150
°C
THYS
Thermal Shutdown Hysteresis
+15
°C
Note:
3. PWM frequency may be lower than specified when limited by tON-min (minimum on-time) or tOFF_min (minimum off-time), at
duty cycle extremes, but output regulation is maintained.
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
www.fairchildsemi.com
4
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
Electrical Specifications
Unless otherwise specified, VIN = 3.7V, TA = 25°C,VIN = VEN
100%
100%
1.82VOUT
VIN=3.7V
1.5VOUT
90%
90%
VIN=5V
1.3VOUT
70%
Efficiency
Efficiency
1.23VOUT
80%
1.82VOUT
1.0VOUT
80%
70%
1.5VOUT
1.3VOUT
60%
1.23VOUT
60%
1.0VOUT
50%
1
10
100
50%
1000
1
10
Output Current (mA)
Figure 4. Efficiency, VIN=3.7V
100%
100%
90%
90%
80%
70%
2.5VIN
80%
70%
3.3VIN, -40C
3.3VIN
3.3VIN, +85C
3.7VIN
60%
60%
5.0VIN, -40C
5.0VIN
5.0VIN, +85C
50%
50%
1
10
100
1
1000
10
100
1000
Output Current (mA)
Output Current (mA)
Figure 6. 1.82VOUT Efficiency
Figure 7. 1.82 VOUT Efficiency Over Temperature
40
75
2.5VIN
3.3VIN
5VIN
5.0Vin, 2.2uF
30
Output Ripple (mVp-p)
2.5VIN
Vout Error (mV)
1000
Figure 5. Efficiency, VIN=5V
Efficiency
Efficiency
100
Output Current (mA)
3.3VIN
3.7VIN
20
5.0VIN
10
60
45
30
15
0
0
0
100
200
300
400
500
600
-10
0
100
200
300
400
500
600
Load Current (mA)
Output Current (mA)
Figure 9. 1.82VOUT Output Ripple with Optional 2.2µF
COUT (1.5µF Actual)
Figure 8. 1.82VOUT Regulation (Normalized)
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
www.fairchildsemi.com
5
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
Typical Performance
Unless otherwise specified, VIN = 3.7V, TA = 25°C,VIN = VEN
40
100%
3.3VIN
3.3VIN, 2.2uF
30
90%
5.0VIN, 2.2uF
20
Efficiency
Vout Error (mV)
5.0VIN
10
80%
70%
2.5VIN
3.3VIN
0
60%
-10
50%
3.7VIN
5.0VIN
0
100
200
300
400
500
600
1
10
Output Current (mA)
Figure 10. 1.82VOUT Regulation (Normalized) with
Optional 2.2µF COUT (1.5µF Actual)
1000
Figure 11. 1.23 VOUT Efficiency
20
100%
2.5VIN
15
90%
3.3VIN
Vout Error (mV)
Efficiency
100
Output Current (mA)
80%
70%
3.3VIN, -40C
3.7VIN
10
5.0VIN
5
0
3.3VIN, +85C
60%
5.0VIN, -40C
-5
5.0VIN, +85C
-10
50%
1
10
100
0
1000
100
1.23VOUT Efficiency Over Temperature
Figure 14.
Figure 13.
1.82VOUT PFM / PWM Boundary
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
300
400
500
600
Output Current (mA)
Output Current (mA)
Figure 12.
200
Figure 15.
1.23VOUT Regulation (Normalized)
1.23VOUT PFM / PWM Boundary
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6
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
Typical Performance
Unless otherwise specified, VIN = 3.7V, TA = 25°C,VIN = VEN
Figure 16. Quiescent Current Over Temperature (EN=VIN) Figure 17.
Figure 18. 1.82VOUT Startup, 3.7VIN, No Load
Figure 19.
Figure 21.
Figure 20. 1.82VOUT Startup into Pre-Charged Output,
3.7VIN, 300mA Load
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
Shutdown Current Over Temperature (EN=0V)
1.82VOUT Startup, 3.7VIN, 3.6Ω Load
Over-Current Protection, 300mA Load
Transition to 300mΩ Fault
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7
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
Typical Performance
Unless otherwise specified, VIN = 3.7V, TA = 25°C,VIN = VEN
1.82VOUT Load Transient, 10-160mA,
tR/tF=100ns
Figure 23. 1.82VOUT Load Transient, 150-500mA,
tR/tF=100ns
Figure 24. 1.82VOUT Load Transient, 10-160mA,
tR/tF=100ns with Optional 2.2µF COUT
Figure 25. 1.82VOUT Load Transient, 150-500mA,
tR/tF=100ns with Optional 2.2µF COUT
Figure 26. 1.82VOUT Line Transient, 3.6-4.2VIN, tR/tF=10µs,
with 10mA Load
Figure 27. 1.82VOUT Line Transient, 3.6-4.2VIN,
tR/tF=10µs, with 300mA Load
Figure 22.
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
www.fairchildsemi.com
8
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
Typical Performance
The FAN4603 is a 600mA, step-down, switching-voltage
regulator that delivers a fixed output from an input voltage
supply of 2.3V to 5.5V. Using a proprietary architecture with
synchronous rectification, the FAN4603 is capable of
delivering a peak efficiency of >90%, while maintaining
efficiency over 80% at load currents as low as 1mA. The
regulator operates at a nominal PWM frequency of 6MHz.
To prevent shutdown during soft-start, the following condition
must be met:
where IMAX(DC) is the maximum load current the IC is
guaranteed to support (600mA).
Table 1 shows combinations of external COUT that allow the
IC to start successfully with the minimum RLOAD that can be
supported at each.
Control Scheme
The FAN4603 uses a proprietary, non-linear, fixed-frequency
PWM modulator to deliver a fast load transient response,
while maintaining a constant switching frequency over a
wide range of operating conditions. Regulator stability is not
dependent on output capacitor ESR, which allows the use of
ceramic capacitors. Although this type of operation normally
results in a switching frequency that varies with input voltage
and load current, an internal frequency loop holds the
switching frequency constant over a large range of input
voltages and load currents.
Table 1. Minimum RLOAD Values for Soft-Start with
Various External COUT Values
For very light loads, FAN4603 incorporates a discontinuous
current (DCM) single-pulse PFM mode, which produces
lower output ripple when compared with other PFM
architectures. Transition between PWM and PFM is
seamless, with a glitch of less than 20mV at VOUT during the
transition between DCM and CCM modes.
VOUT / 0.55
4.7μF, 0402
VOUT / 0.50
10μF, 0603
VOUT / 0.45
If the fault is caused by short circuit, the soft-start circuit
attempts to restart and produces an over-current fault after
about 32μs, which results in a duty cycle of less than 30%,
limiting power dissipation.
PWM mode operation is prohibited during the soft-start cycle
to prevent COUT from being discharged. This allows glitchless
starting into a pre-charged output.
Under-Voltage Lockout (UVLO)
Startup into Large COUT
When EN is HIGH, the under-voltage lockout keeps the part
from operating until the input supply voltage rises high
enough to properly operate. This ensures no misbehavior of
the regulator during startup or shutdown.
The IC may fail to start if heavy load is applied during startup
and a large external COUT is present. This is due to the
current-limit fault response, which protects the IC in an overcurrent condition during soft-start.
Thermal Shutdown
The current required to charge COUT during soft-start,
referred to as “displacement current,” is given as:
When the die temperature increases, due to a high load
condition and/or a high ambient temperature, the output
switching is disabled until the temperature on the die has
fallen sufficiently. The junction temperature at which the
thermal shutdown activates is nominally 150°C with 15°C
hysteresis. After cooling, the IC automatically restarts, with a
soft-start cycle.
(1)
dV
refers to the soft-start slew rate.
dt
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
2.2μF, 0402
A heavy load or short circuit on the output causes the current
to increase until a maximum current threshold is reached.
Upon reaching this point, the high-side switch turns off,
preventing high currents from causing damage. The
regulator continues to limit the current cycle-by-cycle. After
21µs of current limit, the regulator triggers an over-current
fault, causing the regulator to shut down for about 85μs
before attempting an automatic restart.
When EN is LOW, all circuits in FAN4603 are off and the IC
draws ~100nA of current. When EN is HIGH and VIN is
above its UVLO threshold, the regulator begins a soft-start
cycle. The output ramp during soft-start is a fixed slew rate
of 50mV/μs from 0 to 1 VOUT, then 12.5mV/μs until the output
reaches its setpoint.
where
Minimum RLOAD
Current Limit, Fault Shutdown, and Restart
Enable and Soft-Start
dV
dt
COUT
Multiple soft-start cycles may be required for COUT>10μf
(15μf with no load). The IC shuts down for 85μs when IDISP+
ILOAD exceeds ILIMIT for more than 21μs of current limit. The
IC then begins a new soft-start cycle. Subsequent soft-start
cycles begin with any charge retained by COUT while the IC is
off, allowing VOUT to incrementally reach regulation over
multiple soft-start attempts.
Combined
with
exceptional
transient
response
characteristics, the very low quiescent current of the
controller (35µA) maintains high efficiency; even at very light
loads, while preserving fast transient response for
applications requiring tight output regulation.
IDISP = C OUT •
(2)
IDISP + ILOAD < IMAX(DC)
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FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
Operation Description
PCB Layout Guideline
PFM output ripple amplitude can be reduced by adding
external COUT, with negligible impact on efficiency.
Reduced output ripple also results in less DC voltage
excursion at very light loads. Maximum PFM ripple occurs at
no load and is VIN and VOUT proportional.
Figure 29.
Recommended PCB Layout
Figure 28. Typical 1.82VOUT No Load PFM Ripple vs. VIN
FB (pin 5) must be directly connected to VOUT (pin 4).
Note:
4. Ripple is less for lower VOUT levels.
Figure 29 shows the recommended locations of optional CIN
and COUT, shown as 0603 size devices.
Pad P1, shown in Figure 30 “Land Pattern,” is an optional
GND pin. Connection is not required on the PCB.
The effective value of external COUT for a desired ripple
amplitude can be determined using:
⎛ ( V − VOUT ) • VOUT • 62 ⎞
⎟ −1
C OUT. (μF) = ⎜⎜ IN
⎟
VIN • VR
⎝
⎠
(3)
where VR is the desired output ripple amplitude in mV and
VIN and VOUT are in Volts.
The simplified equation above is representative of nominal
component values and does not account for device
tolerances. The bias level effects associated with case size,
voltage rating, and dielectric type of ceramic capacitors
should be considered when selecting COUT.
Minimum Off-Time Effect on Switching
Frequency
tOFF(MIN) is 50ns, while tON(MIN) is 35nS This imposes
V
constraints on the maximum/minimum OUT
that the
VIN
FAN4603 can provide while maintaining a fixed switching
frequency in PWM mode.
When VIN is LOW, fixed switching is maintained as long as
VOUT
≤ 1 − tOFF ( MIN ) • fSW ≈ 0.7 .
VIN
When VIN is HIGH, fixed switching is maintained as long as
VOUT
≥ t ON ( MIN ) • f SW ≈ 0.2
V IN
The switching frequency drops when the regulator cannot
provide sufficient duty cycle at 6MHz to maintain regulation.
Lowering the switching frequency allows VOUT to remain in
regulation, even at very low or very high duty cycle.
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
www.fairchildsemi.com
10
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
Reducing PFM Output Ripple
C
L
P1
A
0.05 A
2X
0.25
0.95
0.95
2.50
B
0.13
0.32
0.50
1
PIN A1
MARK
6
6
1
3.70
0.78
CL
4.00
3
1.10
4
2X
1.10
0.90
1.45
0.08 C
SEATING
PLANE
1.20
CL
0.50
0.30
1.25
1.15
P1
3
4
C
NOTES:
A) THIS PACKAGE IS NOT
PRESENTLY REGISTERED WITH
ANY STANDARDS COMMITTEE.
B) DIMENSIONS ARE IN
MILLIMETERS.
C) DIMENSIONS ARE INCLUSIVE OF
BURRS, MOLD FLASH, AND TIE
BAR PROTRUSIONS.
D) DRAWING CONFORMS TO ASME
Y14.5M-1994
E) DRAWING FILENAME:
MKT-MOD06AArev3
2.50
CL
0.63
LAND PATTERN
RECOMMENDATION
0.10 C
0.85
0.65
0.30
0.80
2.70
TOP VIEW
0.05
0.00
0.50
3
4
CL
0.10
C
L
0.40
1.30
0.05 B
1.45
1.45
1.35
0.68
5 0.48
2
6
1
0.40
0.15
4.00
(0.40)
PIN A1
MARK
0.23
(0.25)
BOTTOM VIEW
Figure 30. 6-Lead, MicroModule QFN 2.5 x 4 x 1mm
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without
notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most
recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty
therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
www.fairchildsemi.com
11
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
Physical Dimensions
FAN4603 — 600mA, Fully Integrated Buck Power Supply Module
© 2009 Fairchild Semiconductor Corporation
FAN4603 • Rev. 1.0.1
www.fairchildsemi.com
12
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