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Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3436
600mA, 650kHz Micropower Synchronous Boost Converter with Output Disconnect FEATURES
Up to 96% efficiency Low start-up voltage 0.8V Internal synchronous rectifier Up to 2MHz switching allows for tiny external components www.DataSheet4U.com 0.5V to 4.4V input range 2.5V to 5.0V output range (Note 3) Feedback Voltage: 1.00V +/-2% Logic controlled shutdown (<1µA) Low 250µA operating supply current (measured at VOUT) Pulse skipping at light load for extended battery life Generates 3.3V at 100mA from single AA cell Stable with ceramic output capacitor Low profile 6-Leads SOT23-6 package
DESCRIPTION
converter delivering high efficiency in a SOT23-6 package. The device has an internal NMOS switch and PMOS synchronous rectifier and has the capacity of supplying 3.3V at 100mA from a single AA cell input. High frequency switching (up to 2MHz) minimizes the board area by allowing the use of tiny, low profile inductors and ceramic capacitors. The KB3436 provides automatic pulse skipping at light loads, thus reducing the supply current for extended battery life. At shutdown, the KB3436 fully discharges the output to ground and draws no supply current. The KB3436 is available in small SOT23-6 package with both fixed and adjustable output voltage versions.
APPLICATIONS
PDAs and organizers Digital cameras Wireless mice/ keyboards Portable medical equipment Cordless phones Wireless Headsets
TYPICAL APPLICATION
100
4.7µH
2-Cell to 3.3V Efficiency
100 VIN = 3V 90
VOUT 3.3V 250mA 4.7 µF 200K
EFFICIENCY (%)
+
EFFICIENCY VIN = 2.4V
10
POWER LOSS (W)
2-CELL AA
4.7µF VIN
SW VOUT 460K FB
80 70 60 50 40 0.1
1 0.1 VIN = 3V 0.01
KB3436 OFF ON SHDN GND
VIN = 2.4V
POWER LOSS 0.001 0.0001 1000
Figure 1. 2-Cell to 3.3V Synchronous Boost Converter
1 10 100 OUTPUT CURRENT (mA)
1
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3436
PACkAGE/ORDER INFORMATION
TOP VIEW SW 1 GND 2 FB 3
●
ABSOLUTE MAXIMUM RATINGS
VIN Voltage .............................................. – 0.3V to 4.4V SW Voltage ................................................. – 0.3V to 6V SHDN, FB Voltage ....................................... – 0.3V to 6V VOUT ........................................................... – 0.3V to 6V Operating Temperature Range ................ – 40°C to 85°C Storage Temperature Range ................... – 65°C to 150° Lead Temperature (Soldering, 10 sec).................. 300°C
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ORDER PART NUMBER
6V IN 5V OUT 4 SHDN
KB3436 TOP MARKING DGABF
TJMAX = 125°C, eJC = 102°C/W
DGABF
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VOUT = 3.3V, unless otherwise specified.
PARAMETER Minimum Start-Up Voltage Minimum Operating Voltage Output Voltage Adjust Range Feedback Voltage +/-2% Feedback Input Current Quiescent Current (Burst Mode Operation) Quiescent Current (Shutdown) Quiescent Current (Active) NMOS Switch Leakage PMOS Switch Leakage NMOS Switch On Resistance PMOS Switch On Resistance NMOS Current Limit Burst Mode Operation Current Threshold Current Limit Delay to Output Max Duty Cycle Switching Frequency SHDN Input High SHDN Input Low SHDN Input Current Soft-Start Time VSHDN = 5.5V SHDN to 90% of VOUT 0.01 2.5 VFB = 0.9V
● ●
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
TYP 0.80 0.5
MAX 0.65 5 1.020 50 30 1 500 5 5
UNITS V V V V nA µA µA µA µA µA 1 1 mA mA ns %
ILOAD = 1mA, VOUT = 0V SHDN = VIN (Note 3) (Note 5)
●
2.5 0.980 1.000 1 20 0.01 350 0.1 0.1 0.35 0.45 600 850 1.25 40 80 500 1 90 650
VFB = 1.05V VFB = 1.2V (Note 4) VSHDN = 0V, Not Including Switch Leakage, VOUT = 0V Measured on VOUT, Nonswitching VSW = 5V VSW = 5V, VOUT = 0V
L = 4.7µH (LTC3429 Only)
800 0.35 1
kHz V V µA ms
2
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3436
Efficiency vs Input Voltage
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise specified)
Single-Cell to 3.3V Efficiency
100 90 100 10 100 VIN = 3V VIN = 1.5V EFFICIENCY VIN = 1.2V 70 VIN = 1.2V VIN = 1.5V POWER LOSS 50 40 0.1 POWER LOSS 0.001 0.0001 1000 50 40 0.1 0.001 0.0001 1000 50 40 0.5 1.5 2.5 3.5 INPUT VOLTAGE (V) 4.5 VIN > VOUT PMOS LDO MODE 0.1 0.01 90 EFFICIENCY VIN = 2.4V 10 90
2-Cell to 3.3V Efficiency
100 100 VOUT = 3.3V IOUT = 50mA
POWER LOSS (W)
POWER LOSS (W)
EFFICIENCY (%)
EFFICIENCY (%)
EFFICIENCY (%)
80
1
80 70 60
1 0.1 VIN = 3V 0.01
80 70 60
VIN = 2.4V
www.DataSheet4U.com 60
1 10 100 OUTPUT CURRENT (mA)
1 10 100 OUTPUT CURRENT (mA)
2-Cell to 5V Efficiency
100 90 VIN = 3V EFFICIENCY VIN = 2.4V VIN = 2.4V VIN = 3V 60 POWER LOSS 50 40 0.1 0.001 0.0001 1000 50 0.01 100 10 100
Li-Ion to 5V Efficiency
100 VIN = 4.2V 90 EFFICIENCY VIN = 3.6V 10
Burst Mode Output Current Threshold vs Input Voltage
35 30 L = 4.7µH
OUTPUT CURRENT (mA)
EFFICIENCY (%)
EFFICIE.