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KB3301
Step-up DC/DC converter
General Description
The KB3301 is a small, high efficiency, and low voltage step-up DC/DC converter with an Adaptive Current Mode PWM control loop, includes an error amplifier, ramp generator, comparator, switch pass element and driver in which providing a stable and high efficient operation over a wide range of load currents. It operates in stable waveforms without external compensation. The low start-up input voltage below 0.8V makes KB3301 suitable for 1 to 4 battery cells applications of providing up to 300mA output current. The 500KHz high switching rate minimized the size of external components. Besides, the 14A low quiescent current together with high efficiency maintains long battery lifetime. The KB3301 is available in small package SOT-26 and SOT89-5
Features
90% Efficiency High Supply Capability to Deliver 5.0V 500mA with input 3.6V-4.2V 14A Quiescent (switch-off) Supply Current 500KHz Fixed Switching Frequency Zero Shutdown Mode Supply Current Providing Flexibility for Using Internal and External Power Switches 1.0V Low Start-up Input Voltage Small SOT-26 & SOT89-5 Package
Ordering Information
Item KB3301MR KB3301PR Package SOT-26 SOT-89-5 Shipping 3000pcs/Reel&Tape 3000pcs/Reel&Tape
Applications
LCD Panel DSC MP3 Wireless Equipment Portable Instrument PDA
Package Information
Typical Application Circuit
L1 Vin + C3 100uF C2 1uF VDD CE EXT LX 3.3~10uH 1N5819 D1
SOT89-5 Pin Configurations
SOT-26 1 2 3 4 5 6
SOT-26
Vout R1 3.3V/5V 1.6M/100K +
KB3301
FB GND R2
C1 100uF
980k/33K
SOT-89-5 Pin NamePin Function 1 CE Chip enable EXT Output 5 GND Ground 4 LX Switching 2 VDD Input 3 FB Feedback input 1.25V
Note:Vin=3.6~4.2V, Vout=5.0V 500mA ( USB host application )
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KB3301
Function Block Diagram
KB3301
Marking Information
Symbol Descripation Step-up DC-DC Converter KB3301 3 Control Code 01
Test Circuit
I(V ) Vin
n i
L1 10uH + C3 100uF R3 100 C2 1uF VDD LX
D1 1N5819 Vout 3.3V/5V + C4 R1 C1 1.6M/100K 102uF 100uF C5 106uF
I(V ) DD CE EXT GND
KB3301
FB R2 980K/33K
SOT-26
SOT-89-5
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KB3301
ABSOLUTE MAXIMUM RATINGS
Paramenter Supply Voltage LX Pin Switch Voltage Other I/O Pin Voltages Lx Pin Switch Current EXT Pin Driver Current Package Thermal Resistance Operating Junction Temperature Storage Temperature Range
(Ta=25
Unit V V V A mA /W /W
SOT-26 SOT-89-5
Symbol Ratings Vin - 0.3V 7V - 0.3 (VDD + 0.8V) - 0.3V (VDD + 0.3V) 2.5 200 Pd 145 45 Tj 125 - 65 ~ +150
ELECTRICAL CHARACTERISTICS
(Vin =1.5V, VDD=3.3V, I=0, Ta = 25
Parameter Start-UP Voltage Operating VDD Range No Load Current I (VIN) Switch-off Current I (VDD) Shutdown Current I (VIN) Feedback Reference Voltage Switching Frequency Maximum Duty LX ON Resistance Current Limit Setting EXT ON Resistance to VDD EXT ON Resistance to GND Line Regulation Load Regulation CE Pin Trip Level Temperature Stability for Vout Thermal Shutdown Thermal Shutdown Hysterises Symbol VST VDD INO LOAD ISWITCH OFF IOFF VREF FS DMAX ILIMIT
, unless otherwise spec
Test Conditions IL = 1mA VDD pin voltage VIN = 1.5V, VOUT = 3.3V VIN = 6V CE Pin = 0V, VIN = 4.5V Close Loop, VDD = 3.3V VDD = 3.3V VDD = 3.3V VDD = 3.3V VDD = 3.3V VDD = 3.3V VDD = 3.3V VIN = 1.5 ~ 2.5V, IL = 1mA VIN = 2.5V, IL = 1 ~ 100mA VDD = 3.3V Min -2 ---1.225 --------0.4 ---Typ 0.80 -75 14 0.01 1.25 500 95 0.3 2 5 5 10 0.25 0.8 50 165 10 Max 0.85 6.5 --1 1.275 --------1.2 ---Units V V A A A V KHz % A mV/V mV/mA V ppm/
VLINE VLOAD TS TSD TSD
* Note: The CE pin shall be tied to VDD pin and inhibit to act the ON/OFF state whenever the VDD pin voltage may reach to 5.5V or above.
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KB3301
Applications
High Current Application
L1 3.3--10uH + C5 100uF C2 1uF VDD CE EXT LX FB R2 980k/33K Vout 3.3V/5V Vin D1 1N5819
Application Note
Output Voltage Setting Referring to application circuits, the output voltage of the switching regulator (VOUT) can be set VOUT1 = (1 + R1 R2 ) x 1.25V
Feedback Loop Design
R1 1.6M/100K Q1 NMOS + C1 100uF
Referring to application circuits, The selection of R1and R2 based on the trade-off between quiescent current consumption and interference immunity is stated below: Follow Equation A Higher R reduces the quiescent current (Path current =1.25V/R2), however resistors beyond 5M are not recommended. Lower R gives better noise immunity, and is less sensitive to interference, layout parasitics, FB node leakage, and improper probing to FB pins.
KB3301
GND
High Voltage Application
Vin=3.1V 6.5V Vout=12V Vin=2.8V~ 6.5V Vout=9V Vin=4.0V 6.5V Vout=8V + C4 47uF NMOS= XP161A1355PR FDN337N C1=47uF C2=10uF C3=NC R1=860K/620K/210K R2=100K/100K/39K RM=0.2 CVDD=1uF 12V / 9V / 8V 1000mA R1 R2 C2 + C1
L1 4.7uH 2.5A D1 1N5819 CVDD Q1 NMOS EXT LX FB C3
RVDD 47
VDD CE
KB3301
GND
A proper value of feed forward capacitor parallel with R1 can improve the noise immunity of the feedback loops, especially in an improper layout. An empirical suggestion is around 0~33pF for feedback resistors of M, and 10nF~0.1F for feedback resistors of tens to hundreds K. For applications without standby or suspend modes, lower values of R1 and R2 are preferred. For applications concerning the current consumption in standby or suspend modes, the higher values of R1and R2 are feedback needed. Such "high impedance loops" are sensitive to any interference, which require careful layout and avoid any interference, e.g. probing to FB pin.
Multi-Output Applications
R1=620K R2=100 C6=0.1uF D1 Vin 3.3V/5V R3 100 C1 1uF L1 3.3--10uH C2 10uF Q1 NMOS C7 1uF VDD CE EXT LX FB R2 C6 R1 C5 10uF 1N5819 Vout2 +18V 10mA C8 1uF C3 10uF Vout1 +9V 100mA
C4 10uF
Vout3 -9V 10mA
KB3301
GND
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KB3301
PACAGE DESCRIPTION
SOT-89-5 Units: mm Min Max 1.400 1.600 0.360 0.520 2.400 2.600 0.406 0.533 -4.250 0.800 -4.400 4.600 -1.700 1.400 1.600 0.380 0.430
Symbol A b B b1 C C1 D D1 e H
SOT-26 Symbol A A1 B b C D e H L Units: mm Min Max 0.889 1.295 -0.152 1.397 1.803 0.356 0.559 2.591 2.997 2.692 3.099 0.838 1.041 0.102 0.254 0.356 0.610
1301
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