FAN53601 / FAN53611 — 6 MHz, 600 mA / 1 A Synchronous Buck Regulator
October 2012
FAN53601 / FAN53611
6 MHz 600 mA / 1 A Synchronous Buck Regulator
Features
600 mA or 1 A Output Current Capability
24 µA Typical Quiescent Current
6 MHz Fixed-Frequency Operation
Best-in-Class Load Transient Response
Best-in-Class Efficiency
2.3 V to 5.5 V Input Voltage Range
0.8 V to 2 V Fixed Output Voltage
Low Ripple Light-Load PFM Mode
Forced PWM and External Clock Synchronization
Internal Soft-Start
Input Under-Voltage Lockout (UVLO)
Thermal Shutdown and Overload Protection
Optional Output Discharge
6-Bump WLCSP, 0.4 mm Pitch
Applications
6-Bump WLCSP, 0.4mm Pitch
3G, 4G, WiFi
®
, WiMAX™, and WiBro
®
Data Cards
Tablets
DSC, DVC
Netbooks
®
, Ultra-Mobile PCs
Description
The FAN53601/11 is a 6 MHz, step-down switching voltage
regulator, available in 600 mA or 1 A options, that delivers a
fixed output from an input voltage supply of 2.3 V to 5.5 V.
Using a proprietary architecture with synchronous
rectification, the FAN53601/11 is capable of delivering a
peak efficiency of 92%, while maintaining efficiency over
80% at load currents as low as 1 mA.
The regulator operates at a nominal fixed frequency of
6 MHz, which reduces the value of the external components
to as low as 470 nH for the output inductor and 4.7 µF for the
output capacitor. In addition, the Pulse Width Modulation
(PWM) modulator can be synchronized to an external
frequency source.
At moderate and light loads, Pulse Frequency Modulation
(PFM) is used to operate the device in Power-Save Mode
with a typical quiescent current of 24 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 6 MHz. In Shutdown Mode, the supply current
drops below 1 µA, reducing power consumption. For
applications that require minimum ripple or fixed frequency,
PFM Mode can be disabled using the MODE pin.
The FAN53601/11 is available in 6-bump, 0.4 mm pitch,
Wafer-Level Chip-Scale Package (WLCSP).
MODE
L1
A1
B1
C1
A2
B2
C2
VIN
EN
GND
C
IN
2.2 F
SW
FB
470nH
F
C
OUT
All trademarks are the property of their respective owners.
Figure 1. Typical Application
Ordering Information
Part Number
FAN53611AUC11X
FAN53611UC123X
FAN53601UC182X
Output
Voltage
(1)
1.100 V
1.233 V
1.820 V
Max. Output
Current
1A
1A
600 mA
Active
Discharge
(2)
Yes
No
No
Package
WLCSP-6,
0.4 mm Pitch
Temperature
Range
–40 to +85°C
Packing
Tape and
Reel
Notes:
1. Other voltage options available on request. Contact a Fairchild representative.
2. All voltage and output current options are available with or without active discharge. Contact a Fairchild representative.
© 2010 Fairchild Semiconductor Corporation
FAN53601 / FAN53611 • Rev. 1.0.1
www.fairchildsemi.com
FAN53601 / FAN53611 — 6 MHz, 600 mA / 1 A Synchronous Buck Regulator
Pin Configurations
Figure 2. Bumps Facing Down
Figure 3. Bumps Facing Up
Pin Definitions
Pin #
A1
B1
C1
C2
B2
A2
Name
MODE
SW
FB
GND
EN
VIN
Description
MODE.
Logic 1 on this pin forces the IC to stay in PWM Mode. A logic 0 allows the IC to
automatically switch to PFM during light loads. The regulator also synchronizes its switching
frequency to four times the frequency provided on this pin. Do not leave this pin floating.
Switching Node.
Connect to output inductor.
Feedback / V
OUT
. Connect to output voltage.
Ground.
Power and IC ground. All signals are referenced to this pin.
Enable.
The device is in Shutdown Mode when voltage to this pin is < 0.4 V and enabled when
> 1.2 V. Do not leave this pin floating.
Input Voltage.
Connect to input power source.
© 2010 Fairchild Semiconductor Corporation
FAN53601 / FAN53611 • Rev. 1.0.1
www.fairchildsemi.com
2
FAN53601 / FAN53611 — 6 MHz, 600 mA / 1 A Synchronous Buck 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
V
IN
V
SW
V
CTRL
Input Voltage
Voltage on SW Pin
EN and MODE Pin Voltage
Other Pins
ESD
T
J
T
STG
T
L
Electrostatic Discharge
Protection Level
Junction Temperature
Storage Temperature
Parameter
Min.
–0.3
–0.3
–0.3
–0.3
Max.
7.0
V
IN
+ 0.3
(3)
V
IN
+ 0.3
V
IN
+ 0.3
3.5
1.5
(3)
(3)
Units
V
V
V
V
kV
Human Body Model per JESD22-A114
Charged Device Model per JESD22-C101
–40
–65
+150
+150
+260
°C
°C
°C
Lead Soldering Temperature, 10 Seconds
Note:
3. 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
CC
I
OUT
L
C
IN
C
OUT
T
A
T
J
Supply Voltage Range
Parameter
Output Current for FAN53601
Output Current for FAN53611
Inductor
Input Capacitor
Output Capacitor
Operating Ambient Temperature
Operating Junction Temperature
Min.
2.3
0
0
Typ.
Max.
5.5
600
1
Units
V
mA
A
nH
µF
470
2.2
1.6
–40
–40
4.7
12.0
+85
+125
μF
°C
°C
Thermal Properties
Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with four-layer 1s2p
boards in accordance to JEDEC standard JESD51. Special attention must be paid to not exceed junction temperature T
J(max)
at a
given ambient temperate T
A
.
Symbol
JA
Parameter
Junction-to-Ambient Thermal Resistance
Typical
150
Unit
°C/W
© 2010 Fairchild Semiconductor Corporation
FAN53601 / FAN53611 • Rev. 1.0.1
www.fairchildsemi.com
3
FAN53601 / FAN53611 — 6 MHz, 600 mA / 1 A Synchronous Buck Regulator
Electrical Characteristics
Minimum and maximum values are at V
IN
= V
EN
= 2.3 V to 5.5 V, V
MODE
= 0 V (AUTO Mode), T
A
= -40°C to +85°C; circuit of
Figure 1, unless otherwise noted. Typical values are at T
A
= 25°C, V
IN
= V
EN
= 3.6 V.
Symbol Parameter
Power Supplies
I
Q
I
(SD)
V
UVLO
Quiescent Current
Shutdown Supply Current
Under-Voltage Lockout Threshold
Conditions
No Load, Not Switching
PWM Mode
EN = GND
Rising V
IN
Min.
Typ.
24
8
0.25
2.15
200
Max.
50
Units
µA
mA
1.00
2.27
µA
V
mV
V
UVHYST
Under-Voltage Lockout Hysteresis
Logic Inputs: EN and MODE Pins
V
IH
V
IL
V
LHYST
I
IN
Enable HIGH-Level Input Voltage
Enable LOW-Level Input Voltage
Logic Input Hysteresis Voltage
Enable Input Leakage Current
Switching Frequency
(4)
MODE Synchronization Range
(4)
Pin to V
IN
or GND
1.2
V
0.4
100
0.01
1.00
V
mV
µA
Switching and Synchronization
f
SW
f
SYNC
V
IN
= 3.6 V, T
A
= 25°C
Square Wave at MODE Input
5.4
1.3
6.0
1.5
6.6
1.7
MHz
MHz
Regulation
1.233 V
Output Voltage
Accuracy
I
LOAD
= 0 to 1 A
PWM Mode
I
LOAD
= 0 to 1 A
PWM Mode
I
LOAD
= 0 to 1 A
PWM Mode
From EN Rising Edge
1.207
1.207
1.784
1.784
1.075
1.075
1.233
1.233
1.820
1.820
1.100
1.100
180
1.272
1.259
1.875
1.856
1.136
1.125
300
µs
V
V
O
1.820 V
1.100 V
t
SS
Soft-Start
Output Driver
R
DS(on)
PMOS On Resistance
NMOS On Resistance
PMOS Peak Current Limit
Output Discharge Resistance
Thermal Shutdown
Thermal Shutdown Hysteresis
V
IN
= V
GS
= 3.6 V
V
IN
= V
GS
= 3.6 V
Open-Loop for FAN53601
Open-Loop for FAN53611
EN = GND
900
1500
175
165
1100
1750
230
150
15
1250
2000
m
m
mA
mA
°C
°C
I
LIM(OL)
R
DIS
T
TSD
T
HYS
Notes:
4. Limited by the effect of t
OFF
minimum
(see Operation Description section).
5.
The Electrical Characteristics table reflects open-loop data.
Refer to the Operation Description and Typical Characteristics
Sections for closed-loop data.
© 2010 Fairchild Semiconductor Corporation
FAN53601 / FAN53611 • Rev. 1.0.1
www.fairchildsemi.com
4
FAN53601 / FAN53611 — 6 MHz, 600 mA / 1 A Synchronous Buck Regulator
Typical Performance Characteristics
Unless otherwise noted, V
IN
= V
EN
= 3.6 V, V
MODE
= 0 V (AUTO Mode), V
OUT
= 1.82 V, and T
A
= 25°C.
95%
92%
90%
88%
86%
84%
82%
80%
78%
76%
74%
72%
70%
68%
66%
64%
62%
60%
0
200
400
600
90%
Efficiency
80%
Efficiency
85%
- 40C, AUTO
+25C, AUTO
+85C, AUTO
- 40C, PWM
+25C, PWM
+85C, PWM
800
1000
75%
70%
0
200
400
600
800
2.7
3.6
4.2
5.0
VIN
VIN
VIN
VIN
1000
Load Current (mA)
Load Current (mA)
Figure 4. Efficiency vs. Load Current and
Input Voltage, Auto Mode, Dotted for Decreasing Load
90%
88%
86%
84%
82%
Figure 5. Efficiency vs. Load Current
and Temperature, Auto Mode, Dotted for FPWM
90%
88%
86%
84%
82%
80%
Efficiency
78%
76%
74%
72%
70%
68%
66%
64%
0
200
400
600
800
2.7
3.6
4.2
5.0
VIN
VIN
VIN
VIN
1000
Efficiency
80%
78%
76%
74%
72%
70%
68%
66%
64%
62%
60%
0
200
400
600
- 40C, AUTO
+25C, AUTO
+85C, AUTO
- 40C, PWM
+25C, PWM
+85C, PWM
800
1000
Load Current (mA)
Load Current (mA)
Figure 6. Efficiency vs. Load Current and
Input Voltage, V
OUT
= 1.23 V, Auto Mode, Dotted
for Decreasing Load
3
2.7VIN, AUTO
3.6VIN, AUTO
4.2VIN, AUTO
5.0VIN, AUTO
2.7VIN, PWM
3.6VIN, PWM
4.2VIN, PWM
5.0VIN, PWM
Figure 7. Efficiency vs. Load Current
and Temperature, V
OUT
=1.23 V, Auto Mode,
Dotted for FPWM
3
2.7VIN, AUTO
3.6VIN, AUTO
4.2VIN, AUTO
5.0VIN, AUTO
2.7VIN, PWM
3.6VIN, PWM
4.2VIN, PWM
5.0VIN, PWM
2
2
Output Regulation (%)
1
Output Regulation (%)
1
0
0
-1
-1
-2
0
200
400
600
800
1000
-2
0
200
400
600
800
1000
Load Current (mA)
Load Current (mA)
Figure 8.
∆V
OUT
(%) vs. Load Current and Input Voltage,
Normalized to 3.6 V
IN
, 500 mA Load, FPWM, Dotted for
Auto Mode
Figure 9.
∆V
OUT
(%) vs. Load Current and Input Voltage,
V
OUT
=1.23 V, Normalized to 3.6 V
IN
, 500 mA Load, FPWM,
Dotted for Auto Mode
© 2010 Fairchild Semiconductor Corporation
FAN53601 / FAN53611 • Rev. 1.0.1
www.fairchildsemi.com
5
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