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Электронный компонент: FAN2012

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FAN2011/FAN2012 Rev. 1.0.2
1
www.fairchildsemi.com
November 2004
F
AN2011/F
AN2012 1.5A Lo
w
V
olta
g
e
Current Mode Sync
hr
onous PWM Buc
k Regulator
FAN2011/FAN2012
1.5A Low Voltage Current Mode Synchronous PWM Buck
Regulator
Features
I
95% Efficiency, Synchronous Operation
I
Adjustable Output Voltage from 0.8V to V
IN
I
4.5V to 5.5V Input Voltage Range
I
Up to 1.5A Output Current
I
Fixed Frequency 1.3 MHz PWM Operation
I
100% Duty Cycle Low Dropout Operation
I
Soft Start
I
Excellent Load Transient Response
I
3x3mm 6-lead MLP Package
Applications
I
Hard Disk Drive
I
Set Top Box
I
Point of Load Power
I
Notebook Computers
I
Communications Equipment
Description
The FAN2011/FAN2012 is a high-efficiency, low-noise synchro-
nous PWM current mode DC-DC converter, designed for low
voltage applications. It provides up to 1.5A continuous load cur-
rent from the 4.5V to 5.5V input. The output voltage is adjust-
able over a wide range of 0.8V to V
IN
by means of an external
voltage divider.
The FAN2011 is always on, while the FAN2012 has an "Enable
Input," and the device can be put in the shutdown mode, in
which the ground current falls below 1A.
A current mode control loop with a fast transient response
ensures excellent line and load regulation. The fixed 1.3MHz
switching frequency enables the user to choose a small, inex-
pensive external inductor and capacitor. Filtering is also easily
accomplished with very small components.
Protection features include input under-voltage lockout, short
circuit protection and thermal shutdown. Soft-start limits in-rush
current during start-up conditions.
The device is available in a 3x3mm 6-lead MLP package, mak-
ing it possible to build a 1.5A complete DC/DC converter in a
tiny space on the PCB.
Typical Application
Figure 1. Typical Application
FAN2011
FAN2012
1
2
3
6
5
4
FB
PGND
SW
PV
IN
V
IN
NC
P1
(AGND)
L1
R2
R1
+5V
V
OUT
4 x 10
F
3.3
H
10
F
10K
1
2
3
6
5
4
FB
PGND
SW
PV
IN
V
IN
EN
P1
(AGND)
L1
R2
R1
+5V
V
OUT
4 x 10
F
3.3
H
10
F
10K
2
www.fairchildsemi.com
FAN2011/FAN2012 Rev. 1.0.2
F
AN2011/F
AN2012 1.5A Lo
w
V
olta
g
e
Current Mode Sync
hr
onous PWM Buc
k Regulator
Pin Assignment
Figure 2. Pin Assignment
Pin Description
FAN2011 (3x3mm 6-Lead MLP)
FAN2012(3x3mm 6-Lead MLP)
Pin No.
Pin Name
Pin Description
P1
AGND
Analog Ground.
P1 must be soldered to the PCB ground.
1
FB
Feedback Input.
Adjustable voltage option, connect this pin to the resistor divider.
2
PGND
Power Ground.
This pin is connected to the internal MOSFET switches. This pin must be exter-
nally connected to AGND.
3
SW
Switching Node.
This pin is connected to the internal MOSFET switches.
4 PV
IN
Supply Voltage Input.
This pin is connected to the internal MOSFET switches.
5
V
IN
Supply Voltage Input.
6
NC
Not Connected.
This pin is not internally connected.
Pin No.
Pin Name
Pin Description
P1
AGND
Analog Ground.
P1 must be soldered to the PCB ground.
1 FB
Feedback
Input.
Adjustable voltage option, connect this pin to the resistor divider.
2
PGND
Power Ground.
This pin is connected to the internal MOSFET switches. This pin must be exter-
nally connected to AGND.
3
SW
Switching Node.
This pin is connected to the internal MOSFET switches.
4
PV
IN
Supply Voltage Input.
This pin is connected to the internal MOSFET switches.
5
V
IN
Supply Voltage Input.
6
EN
Enable Input.
Logic high enables the chip and logic low disables the chip, reducing the supply
current to less than 1A. Do not float this pin.
FAN2011
3x3mm 6-Lead MLP
FAN2012
3x3mm 6-Lead MLP
Top View
1
2
3
6
5
4
1
2
3
6
5
4
FB
PGND
SW
PV
IN
V
IN
NC
FB
PGND
SW
PV
IN
V
IN
EN
P1
(AGND)
P1
(AGND)
3
www.fairchildsemi.com
FAN2011/FAN2012 Rev. 1.0.2
F
AN2011/F
AN2012 1.5A Lo
w
V
olta
g
e
Current Mode Sync
hr
onous PWM Buc
k Regulator
Absolute Maximum Ratings
(Note1)
Recommended Operating Conditions
Notes:
1. Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This
is a stress rating only and functional operation of the device at these or any other conditions above those indicated
in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability. Absolute maximum ratings apply individually only, not in combination.
Unless otherwise specified, all other voltages are referenced to AGND.
2. Junction to ambient thermal resistance,
JA
,
is a strong function of PCB material, board thickness, thickness and
number of copper planes, number of via used, diameter of via used, available copper surface, and attached heat
sink characteristics.
3. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
4. Refer to the applications section for further details.
Parameter
Min
Max
Unit
V
IN
-0.3
7
V
PV
IN
and any other pin
-0.3
V
IN
V
Thermal Resistance-Junction to Tab (
JC
), 3mmx3mm 6-lead MLP (Note 2)
8
C/W
Lead Soldering Temperature (10 seconds)
260
C
Storage Temperature
-65
150
C
Junction Temperature
-40
150
C
Electrostatic Discharge (ESD) Protection Level (Note 3)
HBM
4
kV
CDM
2
Parameter
Min
Typ
Max
Unit
Supply Voltage Range
4.5
5.5
V
Output Voltage Range, Adjustable Version
0.8
V
IN
V
Output Current
1500
mA
Inductor (Note 4)
3.3
H
Input Capacitor (Note 4)
10
F
Output Capacitor (Note 4)
4 x 10
F
Operating Ambient Temperature Range
FAN2011 and FAN2012
0
+85
C
FAN2011I and FAN2012I
-40
+85
4
www.fairchildsemi.com
FAN2011/FAN2012 Rev. 1.0.2
F
AN2011/F
AN2012 1.5A Lo
w
V
olta
g
e
Current Mode Sync
hr
onous PWM Buc
k Regulator
Electrical Characteristics
Additional Electrical Characteristics for FAN2012
Notes:
5. Load transient response test waveform.
Figure 3. Load Transient Response Test Waveform
V
IN
= 4.5V to 5.5V, V
OUT
= 1.2V, I
OUT
= 200mA, C
IN
= 10F, C
OUT
= 4 x 10F, L = 3.3H, T
A
= 0C to
+85C, unless otherwise noted. Typical values are at T
A
= 25C.
Parameter
Conditions
Min.
Typ.
Max.
Units
Input Voltage
4.5
5.5
V
Quiescent Current
I
OUT
= 0mA
7
10
mA
UVLO Threshold
V
IN
rising
3.5
3.7
3.9
V
Hysteresis
150
mV
PMOS On Resistance
V
IN
= V
GS
= 5V
150
290
m
NMOS On Resistance
V
IN
= V
GS
= 5V
150
290
m
P-channel Current Limit
4.5V < V
IN
< 5.5V
2200
2600
3500
mA
Over-Temperature Protection
Rising temperature
150
C
Hysteresis
20
C
Switching Frequency
1000
1300
1600
kHz
Line Regulation
V
IN
= 4.5 to 5.5V, I
OUT
= 100mA
0.16
%/V
Load Regulation
0mA
I
OUT
1500mA
0.2
0.5
%
Output Voltage During Load Transition
(Note 5)
I
OUT
from 700mA to 100mA
5
%
Output Voltage During Load Transition
(Note 5)
I
OUT
from 100mA to 700mA
-5
%
Reverse Leakage Current Into Pin SW
V
IN
= Open, EN = GND, V
sw
= 5.5V
0.1
1
A
Reference Voltage, V
REF
0.8
V
Output Voltage Accuracy
V
IN
= 4.5 to 5.5V
0mA
I
OUT
1500mA
FAN2011
FAN2012
-2
2
%
FAN2011I
FAN2012I
-40C to +85C
-3
3
%
T
A
= 0C to +85C, V
IN
= 4.5 to 5.5V. Typical values are at T
A
= 25C.
Parameter
Conditions
Min.
Typ.
Max.
Units
Shutdown Mode Supply Current
V
EN
= 0V
0.1
1
A
EN Bias Current
0.1
A
EN High Voltage
1.3
V
EN Low Voltage
0.4
V
0.6
Time (mSec)
I
LOAD
(mA)
ss
0
4.6
100
700
tr = 67nS
tf = 67nS
5
www.fairchildsemi.com
FAN2011/FAN2012 Rev. 1.0.2
F
AN2011/F
AN2012 1.5A Lo
w
V
olta
g
e
Current Mode Sync
hr
onous PWM Buc
k Regulator
Typical Performance Characteristics
T
A
= 25C, C
IN
= 10F, C
OUT
= 40F, L = 3.3H, V
IN
= 5V, unless otherwise noted.
10
100
1000
10000
30
40
50
60
70
80
90
100
-40
-20
0
20
40
60
80
100
120
1.194
1.196
1.198
1.200
1.202
1.204
1.206
1.208
1.210
1.212
1.214
Temp (
C) vs Vout@0 mA
Temp (
C) vs Vout@100mA
Temp (
C) vs Vout@ 500 mA
Temp (
C) vs Vout@1000 mA
Temp (
C) vs Vout@1500 mA
Output Voltage vs. Ambient Temperature
Ambient Temperature (C)
Outp
ut V
o
l
t
a
g
e
(V)
0
20
40
60
80
100
120
1230
1235
1240
1245
1250
1255
1260
Ambient Temperature (C)
Swi
t
ch
i
n
g
Fre
q
ue
nc
y (
KHz)
Switching Frequency vs. Ambient Temperature
Load Current (mA)
Po
wer Efficiency (%)
Efficiency vs. Load Current
V
IN
= 5.5V
V
IN
= 4.5V
V
IN
= 5V
V
OUT
= 3.3V
V
OUT
= 1.2V