FAN5336 — 1.5MHz TinyBoost™ Regulator with 33V Integrated FET Switch
April 2009
FAN5336
1.5MHz TinyBoost™ Regulator with 33V Integrated
FET Switch
Features
■
1.5MHz Switching Frequency
■
Low Noise
■
Adjustable Output Voltage
■
Up to 1.5A Peak Switch Current
■
Low Shutdown Current: <1µA
■
Cycle-by-Cycle Current Limit
■
Over-Voltage Protection at the Feedback Pin
■
Fixed-Frequency PWM Operation
■
Soft-Start Capability
■
Internal Compensation
■
Thermal Shutdown
■
Excellent Load Regulation: 0.2%
■
Low Ripple
■
6-Lead 3x3mm MLP
Description
The FAN5336 is a high-efficiency, low-noise, fixed-fre-
quency PWM, current-mode, DC-DC boost regulator. It
is designed for small LCD bias supply and white LED
backlight supply applications. Depending on the applica-
tion, a FAN5336 regulator can output up to 33V at up to
50mA output current. With output voltage up to 21V, the
output current can be up to 100mA. FAN5336 can be
used for power conversion as low as 9V output voltage.
A current-mode control loop has a fast transient
response that provides excellent load regulation within
0.2% of output voltage. The FAN5336 switches at fixed
1.5MHz frequency, allowing the use of small, low-cost
external components. Constant frequency switching
results in low input noise and small output capacitors.
FAN5336 provides cycle-by-cycle current limiting up to
1.5A peak current.
The FAN5336 may be used to drive a serial flash LED
with up to 100mA current at 21V for a maximum of
400ms on-time and 10% duty cycle.
A low-EMI mode reduces interference and radiated elec-
tromagnetic energy caused by the ringing of the inductor.
Additional features include thermal shutdown, over-volt-
age protection, cycle-by-cycle current limit, low ripple,
and soft-start support.
The device is available in a 3x3mm 6-lead MLP, 0.8mm
thickness package.
Applications
■
Portable Displays
■
Mobile Phone / Smart Phone LED Backlights
■
Display Bias
■
PDA, DVD, Camcorder Backlights
■
Pager and Cordless Phone Displays
■
Portable Medical Diagnostic Equipment
■
Remote Controls
■
MP3 or PMP or DSC Players
■
Serial Flash LED Drivers
Application Diagram
V
IN
C
IN
10µF
1 V
2
L1
6.8µH
SW 6
NC 5
C
F
R1
180pF
D1
V
OUT
C
OUT
4.7µF
IN
GND
P1
ON
OFF
3
SHDN
FB
4
R2
Figure 1. Typical Application Diagram
© 2004 Fairchild Semiconductor Corporation
FAN5336 Rev. 1.0.2
www.fairchildsemi.com
FAN5336 — 1.5MHz TinyBoost™ Regulator with 33V Integrated FET Switch
Ordering Information
Part Number
FAN5336MPX
FAN5336UMPX
Package
6-Lead 3x3mm MLP
6-Lead 3x3mm UMLP
Temperature Range
-40°C to +85°C
-40°C to +85°C
Eco Status
Green
Green
Packing Method
Tape and Reel
Tape and Reel
For Fairchild’s definition of “green” Eco Status, please visit:
http://www.fairchildsemi.com/company/green/rohs_green.html.
Pin Assignments
VIN
GND
SHDN
1
2
3
6
SW
NC
FB
P1
5
4
Figure 2. 6-Lead, 3x3mm MLP (Top View)
Pin Descriptions
Pin #
P1
1
2
3
4
5
6
Name
GND
V
IN
GND
SHDN
FB
NC
SW
Description
Analog and Power Ground.
P1 must be soldered to the PCB ground.
Input Voltage Pin.
Ground.
Shutdown Control Pin.
Logic HIGH enables, logic LOW disables the device.
Feedback Pin.
Feedback node that connects to an external voltage divider.
No Connect.
Switching Node.
© 2004 Fairchild Semiconductor Corporation
FAN5336 Rev. 1.0.2
www.fairchildsemi.com
2
FAN5336 — 1.5MHz TinyBoost™ Regulator with 33V Integrated FET Switch
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only.
Symbols
V
IN
V
IN
to GND
FB, SHDN to GND
SW to GND
T
L
T
J
T
STG
Θ
JA
ESD
Parameter
Min.
-0.3
-0.3
Max.
6.0
V
IN
+ 0.3
35
300
150
Unit
V
V
V
°C
°C
°C
°C/W
kV
Lead Soldering Temperature (10 seconds)
Junction Temperature
Storage Temperature
Thermal Resistance
Electrostatic Discharge Protection Level
(1)
HBM
CDM
2
1
-55
150
265
Note:
1. Using EIA/JESD22A114B (Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
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.
Symbols
V
IN
V
OUT
T
A
C
OUT
Input Voltage
Output Voltage
Parameter
Min.
2.7
9
-40
2.2
(2)
Typ.
Max.
5.5
33
Unit
V
V
°C
µF
Ambient Operating Temperature
Output Capacitance
25
85
10
Note:
2. This load capacitance value is required for loop stability. Tolerance, temperature variation, and voltage dependency
of the capacitance must be considered. Typically a 4.7µF ceramic capacitor is required to achieve the specified
value at V
OUT
= 33V.
© 2004 Fairchild Semiconductor Corporation
FAN5336 Rev. 1.0.2
www.fairchildsemi.com
3
FAN5336 — 1.5MHz TinyBoost™ Regulator with 33V Integrated FET Switch
Electrical Characteristics
V
IN
= 2.7 to 5.5V, V
SHDN
= V
IN
, and T
A
= -40°C to +85°C. Typical values are at T
A
= 25°C and V
IN
= 3.6V unless
otherwise noted.
Parameter
Output Voltage Accuracy
Switch Current Limit
Load Current
Switch On-Resistance
Quiescent Current
OFF Mode Current
Shutdown Threshold
Shutdown Pin Bias Current
Feedback Voltage (V
REF
)
Feedback Pin Bias Current
Feedback Voltage Line
Regulation
(3)
Switching Frequency
Maximum Duty Cycle
Start-up Turn-on Time
Load Regulation
Switch Leakage Current
V
IN
= 3.6V
V
IN
= 3.2V
Conditions
Refer to the Test Circuit in Figure 3.
Min.
-3
1.1
75
100
Typ.
Max.
+3
Units
%
A
mA
1.5
1.8
V
OUT
= 21V ±5%, V
IN
≥
3.0V
V
OUT
= 21V ±5%, V
IN
≥
3.2V,
T
ON
< 0.4s, T
OFF
> 3.6s
V
IN
= 3.6V
No Switching, V
FB
≥
1.27V
Switching
V
SHDN
= 0V
Device ON
Device OFF
V
SHDN
= 0V or V
SHDN
= 5.5V
I
Load
= 0mA, V
IN
= 3.6V at 25°C
0.4
0.7
6.5
0.1
1.5
0.5
1
1.205
1.230
1
10
1.255
10
1.5
1.85
5.0
1
3.0
Ω
mA
µA
V
nA
V
nA
%/V
MHz
%
ms
%
µA
3.0V < V
IN
< 5.5V, I
LOAD
= 0mA
1.15
87
V
IN
= 3.0V, I
OUT
= 75mA
V
IN
= 3.6V, 1mA < I
Load
<100mA
No Switching, V
IN
= 5.5V
0.4
1.50
93
3.0
0.2
Note:
ΔV
OUT
1
3.The line regulation is calculated based on
------------------
×
--------------
.
ΔV
IN
V
OUT
Test Circuit
V
IN
C
IN
10µF
1 V
2
2.7V to 5.5V
L
6.8µH
SW 6
NC 5
FB 4
R2
10k
C
F
R1
160k
180pF
BAT54
V
OUT
C
OUT
4.7µF
IN
GND
P1
ON
OFF
3
SHDN
Figure 3. Test Circuit
© 2004 Fairchild Semiconductor Corporation
FAN5336 Rev. 1.0.2
www.fairchildsemi.com
4
FAN5336 — 1.5MHz TinyBoost™ Regulator with 33V Integrated FET Switch
Typical Performance Characteristics
V
IN
=3.6V, V
OUT
=21V, T
A
=25°C, C
IN
=10µF, C
OUT
=4.7µF, L=6.8µH, C
F
=180pF, R
1
=160kΩ, R
2
=10kΩ unless otherwise noted.
Efficiency vs. Load Current
90
85
80
75
70
65
60
55
50
45
40
10
20
30
40
50
60
70
80
Load Regulation
21.5
21.3
21.1
20.9
Vin=2.7V
20.7
20.5
10
20
30
40
50
60
70
80
90
100
Vin=3.6V
Vin=5.5V
Vin=2.7V
Vin=3.6V
Vin=5.5V
90
100
Load Current (mA)
Output Voltage (V)
Efficiency (%)
Load Current (mA)
Figure 4. Efficiency vs. Load Current
Figure 5. Load Regulation
Line Regulation at No Load
22
21.8
21.6
21.4
21.2
21
20.8
20.6
20.4
20.2
20
2.5
3
3.5
4
4.5
5
5.5
Output Voltage(V)
Battery Voltage(V)
Figure 6. Line Regulation at No Load
Figure 7. 100mA Load Current Operation
Figure 8. Start-up Response
Figure 9. Load Transient Response
© 2004 Fairchild Semiconductor Corporation
FAN5336 Rev. 1.0.2
www.fairchildsemi.com
5
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