FAN53555 — 5 A, 2.4 MHz, Digitally Programmable TinyBuck™ Regulator
March 2014
FAN53555
5 A, 2.4 MHz, Digitally Programmable TinyBuck
®
Regulator
Features
Fixed-Frequency Operation: 2.4 MHz
Best-in-Class Load Transient
Continuous Output Current Capability: 5 A
Pulse Current Capability: 6.5 A (05 Option)
2.5 V to 5.5 V Input Voltage Range
Digitally Programmable Output Voltage:
-
00/01/03/05/08/18 Options: 0.6-1.23 V in 10 mV Steps
-
04/042/09/ Options: 0.603-1.411 V in 12.826 mV Steps
-
23 Option: 0.60-1.3875 V in 12.5 mV Steps
-
24 Option: 0.603-1.420 V in 12.967 mV Steps
-
13 Option: 0.8-1.43 V in 10 mV Steps
Programmable Slew Rate for Voltage Transitions
I
2
C-Compatible Interface Up to 3.4 Mbps
PFM Mode for High Efficiency in Light Load
Quiescent Current in PFM Mode: 60 µA (Typical)
Internal Soft-Start
Input Under-Voltage Lockout (UVLO)
Thermal Shutdown and Overload Protection
20-Bump Wafer-Level Chip Scale Package (WLCSP)
Description
The FAN53555 is a step-down switching voltage regulator
that delivers a digitally programmable output from an input
voltage supply of 2.5 V to 5.5 V. The output voltage is
programmed through an I
2
C interface capable of operating up
to 3.4 MHz.
Using a proprietary architecture with synchronous
rectification, the FAN53555 is capable of delivering 5 A
continuous at over 80% efficiency, while maintaining over
80% efficiency at load currents as low as 10 mA. Pulse
currents as high as 6.5 A can be supported by the 05 option.
The regulator operates at a nominal fixed frequency of
2.4 MHz, which reduces the value of the external components
to 330 nH for the output induction and as low as 20 µF for the
output capacitor. Additional output capacitance can be added
to improve regulation during load transients without affecting
stability. Inductance up to 1.2 µH may be used with additional
output capacitance.
At moderate and light loads, Pulse Frequency Modulation
(PFM) is used to operate in Power-Save Mode with a typical
quiescent current of 60 µA. 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, operating at 2.4 MHz. In
Shutdown Mode, the supply current drops below 1 µA,
reducing power consumption. PFM Mode can be disabled if
constant frequency is desired. The FAN53555 is available in a
20-bump, 1.6 x 2 mm, WLCSP.
PVIN
EN
SDA
SCL
VSEL
FAN53555
C
IN1
VOUT
SW
GND
AGND
L1
Applications
Application, Graphic, and DSP Processors
-
ARM™, Krait™, OMAP™, NovaThor™, ARMADA™
Hard Disk Drives
Tablets, Netbooks, Ultra-Mobile PCs
Smart Phones
Gaming Devices
C
IN
VDD
C
OUT
Core
Processor
(System Load)
GND
Figure 1. Typical Application
All trademarks are the property of their respective owners.
© 2010 Fairchild Semiconductor Corporation
FAN53555 • Rev. 1.1.8
www.fairchildsemi.com
FAN53555 — 5 A, 2.4 MHz, Digitally Programmable TinyBuck™ Regulator
Ordering Information
Part Number
FAN53555UC00X
FAN53555UC01X
FAN53555UC03X
FAN53555UC04X
FAN53555UC05X
FAN53555BUC05X
(1)
FAN53555UC08X
FAN53555BUC08X
(1)
Max.
Max.
I C Slave A1 PIN
Pulse Temperature
Packing
RMS
Package
Address Function
Current
Range
Method
Current
VSEL0 VSEL1
(50 ms)
2
Power-Up
Defaults
1.05
0.90
0.90
1.10
0.90
0.90
1.02
1.02
1.10
1.10
1.15
1.15
1.02
1.02
1.15
1.225
1.225
1.10
1.20
OFF
N/A
1.20
OFF
OFF
1.15
1.15
1.10
1.10
1.15
1.15
1.15
1.15
1.15
1.212
1.212
1.20
C4
C0
VSEL
VSEL
PGOOD
VSEL
VSEL
VSEL
VSEL
VSEL
VSEL
VSEL
VSEL
VSEL
VSEL
VSEL
VSEL
VSEL
VSEL
VSEL
5A
5A
5A
5A
5A
5A
4A
4A
3A
3A
5A
5A
5A
5A
5A
4A
4A
5A
N/A
N/A
N/A
N/A
6.5 A
6.5 A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
-40 to 85°C
WLCSP-
20
Tape
& Reel
FAN53555BUC09X
(1)
FAN53555UC09X
FAN53555UC13X
FAN53555BUC13X
(1)
FAN53555UC18X
FAN53555BUC18X
FAN53555BUC23X
(1)
(1)
FAN53555UC24X
FAN53555BUC24X
(1)
FAN53555UC042X
(2)
Notes:
1. The FAN53555BUC05X, FAN53555BUC08X, FAN53555BUC09X, FAN53555BUC13X, FAN53555BUC18X,
FAN53555BUC23X, and FAN53555BUC24X, include backside lamination.
2. The 042 option is the same as the 04 option, except the I
2
C slave addresses.
Recommended External Components
Table 1. Recommended External Components for 5 A Maximum Load Current
Component
L1
C
OUT
Description
330 nH Nominal
2 Pieces;
22
F,
6.3 V, X5R, 0805
1 Piece;
10
F,
10 V, X5R, 0805
2 Pieces;
10
F,
6.3 V, X5R, 0805
10 nF, 25 V, X7R, 0402
Vendor
See Table 2
GRM21BR60J226M (Murata)
C2012X5R0J226M (TDK)
LMK212BJ106KG-T (Taiyo Yuden)
C2012X5R1A106M (TDK)
GRM21BR60J106M (Murata)
C2012X5R0J106M (TDK)
GRM155R71E103K (Murata)
C1005X7R1E103K (TDK)
Parameter
L
DCR
C
C
C
C
Typ.
0.33
13
44
10
20
10
Unit
µH
m
µF
C
IN
C
IN1
nF
© 2010 Fairchild Semiconductor Corporation
FAN53555 • Rev. 1.1.8
www.fairchildsemi.com
2
FAN53555 — 5 A, 2.4 MHz, Digitally Programmable TinyBuck™ Regulator
Table 2. Recommended Inductors for High-Current Applications
Component Dimensions
Manufacturer
Vishay
Mag. Layers
(4)
Part#
IHLP1616ABERR47M01
MMD-04ABNR33M-M1-RU
MMD-04ABNR47M-M1-RU
SM1608-R33M
SRP4012-R33M
SRP4012-R47M
VLC5020T-R47M
L (nH)
470
330
470
330
330
470
470
DCR (mΩ)
20.0
12.5
20.0
9.6
15.0
20.0
15.0
I
MAXDC
(3)
5.0
7.5
5.0
9.0
6.7
5.0
5.4
L
4.5
4.5
4.5
4.5
4.7
4.7
5.0
W
4.1
4.1
4.1
4.1
4.2
4.2
5.0
H
1.2
1.2
1.2
2.0
1.2
1.2
2.0
Mag. Layers
Inter-Technical
Bournes
Bournes
TDK
Notes:
3. I
MAXDC
is the lesser current to produce 40°C temperature rise or 30% inductance roll-off.
4. Preferred inductor value is 330 nH and all dynamic characterization was performed with this coil.
FAN53555-24, -08, and -09 Reduced Output Current (4 A Max. RMS. for 08, and 24, 3 A
Max. RMS for 09) Smaller Footprint Application
The FAN53555-24, -08, and -09 were developed to provide power for core processors with high-performance graphics
acceleration in Li-Ion-powered handheld devices. These applications require a very compact solution. The smaller input and
output capacitors in the table below assume that additional bypass capacitance exists across the battery in fairly close proximity
to the regulator(s). The C
IN
capacitors specified below are the capacitors that are required in very close proximity to VIN and
PGND
(see layout recommendations in Figure 2 below).
Table 3. Recommended External Components for Lower-Current Applications with FAN53555-08-09-24
Component
L1
Description
470 or 330 nH, 2016 case size
-08, ,24 Option
2 Pieces 22
F,
6.3 V, X5R, 0603
-09 Option
1 Piece 22
F,
6.3 V, X5R, 0603
1 Piece;
10
F,
10 V, X5R, 0402
10 nF, 25 V, X5R, 0201
Vendor
Parameter
See Table 4
Typ.
Unit
44
C1608X5R0J226M (TDK)
C
22
GRM155R61A106M (Murata)
TMK063CG100DT-F (Taiyo Yuden)
C
C
10
10
nF
µF
C
OUT
C
IN
C
IN1
Table 4. Recommended Inductors for Lower-Current Applications with FAN53555-08-09-24
Component Dimensions
Manufacturer
Toko
Toko
Cyntek
SEMCO
Part#
DFE201612R-H-R33N
DFE201612C-R47N
PIFE20161B-R47MS-39
CIGT201610HMR47SCE
L (nH)
330
470
470
470
(5)
DCR (mΩ Typ.) I
MAXDC
L
2.0
2.0
2.0
2.0
W
1.6
1.6
1.6
1.6
H
1.2
1.2
1.2
0.9
25
40
30
30
3.2
3.2
3.1
3.1
Note:
5. I
MAXDC
is the lesser current to produce 40°C temperature rise or 30% inductance roll-off.
© 2010 Fairchild Semiconductor Corporation
FAN53555 • Rev. 1.1.8
www.fairchildsemi.com
3
FAN53555 — 5 A, 2.4 MHz, Digitally Programmable TinyBuck™ Regulator
Layout
Figure 2. Reduced-Footprint Layout
Pin Configuration
VSEL*
A1
EN
A2
SCL
A3
VOUT
A4
A4
A3
A2
A1
SDA
B1
B2
B3
AGND
B4
B4
B3
B2
B1
GND
C1
C2
C3
C4
C4
C3
C2
C1
D4
D3
D2
D1
VIN
D1
D2
D3
SW
D4
E4
E3
E2
E1
E1
E2
E3
E4
A1 = VSEL for 00, 01, 04, 05, 08, 09, 13, 18, 23, 24
A1 = PGOOD for 03
Figure 4. Bottom View
Figure 3. Top View
Pin Definitions
Pin #
Name
Description
VSEL
Voltage Select.
When this pin is LOW, V
OUT
is set by the VSEL0 register. When this pin is HIGH, V
OUT
(Except -
is set by the VSEL1 register.
03 Option)
PGOOD
(03)
A2
A3
A4
B1
B2, B3,
C1 – C4
B4
D1, D2,
E1, E2
D3, D4,
E3, E4
EN
SCL
VOUT
SDA
GND
AGND
VIN
SW
Power Good.
This open-drain pin pulls LOW if an overload condition occurs or soft-start is in progress.
Enable.
The device is in Shutdown Mode when this pin is LOW. All register values are kept during
shutdown. Options 00, 01, 03, 05, 08 09, 13, 18, and 23 do not reset register values when EN is raised.
The 04, 24, and 042 options reset all registers to default values when EN pin is LOW. If pulled up to a
low-impedance voltage source greater than 1.8 V, use at least 100
series resistor.
I
2
C Serial Clock
VOUT.
Sense pin for VOUT. Connect to COUT.
I
2
C Serial Data
Ground.
Low-side MOSFET is referenced to this pin. C
IN
and C
OUT
should be returned with a minimal
path to these pins.
Analog Ground.
All signals are referenced to this pin. Avoid routing high dV/dt AC currents through
this pin.
Power Input Voltage.
Connect to the input power source. Connect to C
IN
with minimal path.
Switching Node.
Connect to the inductor.
A1
© 2010 Fairchild Semiconductor Corporation
FAN53555 • Rev. 1.1.8
www.fairchildsemi.com
4
FAN53555 — 5 A, 2.4 MHz, Digitally Programmable TinyBuck™ Regulator
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
exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum
ratings are stress ratings only.
Symbol
Voltage on SW, VIN Pins
V
IN
Voltage on EN Pin
Parameter
IC Not Switching
IC Switching
Tied without Series Resistance
)
Tied through Series Resistance of at Least 100
Min.
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
Max.
7.0
6.5
2.0
V
IN(6)
V
IN(6)
3.0
100
2500
1500
Unit
V
V
V
V
V/ms
V
Voltage on All Other Pins IC Not Switching
V
OUT
Voltage on VOUT Pin
Human Body Model per JESD22-A114
Charged Device Model per JESD22-C101
V
INOV_SLEW
Maximum Slew Rate of V
IN
> 6.5 V, PWM Switching
ESD
T
J
T
STG
T
L
Electrostatic Discharge
Protection Level
Junction Temperature
Storage Temperature
Lead Soldering Temperature, 10 Seconds
-40
-65
+150
+150
+260
°C
°C
°C
Note:
6. Lesser of 7 V or V
IN
+0.3 V.
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
V
IN
I
OUT
L
C
IN
C
OUT
T
A
T
J
Supply Voltage Range
Output Current
Inductor
Input Capacitor
Output Capacitor
Parameter
Min.
2.5
0
Typ.
Max.
5.5
5
Unit
V
A
µH
µF
µF
0.33
10
44
-40
-40
+85
+125
Operating Ambient Temperature
Operating Junction Temperature
°C
°C
Thermal Properties
Symbol
JA
Parameter
Junction-to-Ambient Thermal Resistance
(7)
Min.
Typ.
38
Max.
Unit
°C/W
Note:
7.
See Thermal Considerations in the Application Information section.
© 2010 Fairchild Semiconductor Corporation
FAN53555 • Rev. 1.1.8
www.fairchildsemi.com
5
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