2002 Short Form Catalog D-17 © Copyright 2001 Sipex Corporation
D
description
The SP4446 is a micro power step-up DC/DC converter. It is a current
limited, fixed off time controlled regulator configured for use in boost
mode applications. The operating voltage can be less than 2V and is
capable of generating voltages as high as 34 Volts.
The SP4446 is to be supplied in a SOT-23-5 and permits the
construction of complete regulators that occupy < 0.2 square inches of
board space.
SP4446
Low Voltage, Miniature, Boost DC/DC Conver ter
Less than 2V In, up to 34V Out
®
features
■High Output Voltage: Up to 34V
■Optimized for Single Supply,
1.2- 7V Applications
■High Efficiency: Greater than
75%
■Low Quiescent Current: 30µA
■Miniature Package:
5-Lead SOT-23
■Single Battery Cell Operation
■Accurate 1% Band Gap
Reference
■Programmable Output Voltage
■1Ωswitch (300mV/300mA)
applications
■LCD Bias
■Digital Cameras
■Cell Phone
■Battery Backup
■Handheld Computers
■Low Voltage Power
■Portable Instrumentation
typical application circuit
SP4446
R1
C1
4.7µF
VIN
L1
10µH
SHDN GND FB
SW
®
R2
C2
1µF
HV OUT
VIN
2V to 7V
D1
D1N4004
ADVANCE
pin no. name description
1 SW Switch Pin, This is the Drain of the internal
NMOS power switch. Make the metal trace
short to this pin for minimum EMI.
2 GND Ground. Connect this pin directly to the local
ground plane.
3 FB Feedback Pin. Set the output voltage by
selecting values for R1 and R2.
R1 = R2[(VOUT/1.23) - 1]
4 SHDN Shutdown Pin. Tie this pin to 0.9V or higher
to enable the device. Tie below 0.25V to turn
off the device.
5 VIN Input Supply Pin. Bypass this pin with a
capacitor as close to the device as possible.
SP4446
5L SOT-23
5 4
1 2 3
SW GND FB
SHDN
VIN
Coming
Q202
2002 Short Form Catalog D-18 © Copyright 2001 Sipex Corporation
D
absolute maximum ratings
These are stress ratings only and functional opera-
tion of the device at these ratings or any other above
those indicated in the operation sections of the
specifications below is not implied. Exposure to
absolute maximum rating conditions for extended
periods of time may affect reliability.
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15V
SW Voltage . . . . . . . . . . . . . . . . . . . . . .-0.4 to 36V
FB Voltage . . . . . . . . . . . . . . . . . . . . . . .VIN + 0.3V
All other pins . . . . . . . . . . . . . .-0.3V to VCC + 0.3V
Current into FB . . . . . . . . . . . . . . . . . . . . . .± 1 mA
SHDN Voltage . . . . . . . . . . . . . . . . . . . . . . . . .10V
TJ MAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125°C
Commercial Temperature Range . . . . .-65 to 150°C
Peak Output Current < 10µs SW . . . . . . . . .500mA
Storage Temperature . . . . . . . . . . . . .-65 to 150°C
Power Dissipation . . . . . . . . . . . . . . . . . . .200mW
Lead Temperature (Soldering, 10 sec) . . . . . .300°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . .2kV HBM
PARAMETER MIN TYP MAX UNITS CONDITIONS
VIN 1.0 15 V Switch Current Limit = 350mA
Supply Current 20 30 µA No Switching
1 µA SHDN = 0V
V Feedback (FB) 1.205 1.230 1.255 V
FB Hysteresis 8 mV
VFB Input Bias Current 80 nA VFB = 1.23V
Line Regulation 0.02 0.1 % 1.2 ≤VIN ≤12V
Switch Off Time 400 ns VFB > 1V
1500 ns VFB < 0.6V
Switch VCESAT 85 120 V ISW = 75mA
250 350 V ISW = 300mA
Switch Current Limit 75 100 125 mA Note 3
300 350 400 mA Note 3
SHDN Bias Current 2 3 µA VSHDN = 1.2V
8 12 µA VSHDN = 5V
SHDN VIN High 0.9 V
SHDN VIN Low 0.25 V
Switch Leakage Current 0.01 5 µA Switch Off, VSW = 5V
electrical specifications
Unless otherwise specified: VIN = 1.2V, VSHDN = VIN, -40°C < TA< 85°C, C1 = 4.7µF, C2 = 1µF.
Note1. Absolute maximum ratings are those values beyond which the device may be impaired.
Note 2. Guaranteed by design, characterization and statistical process control, tested at T = 25°C only.
Note 3. Current limit is guaranteed by design and is not production tested.
SP4446
