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Kingbor Technology |
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
www.DataSheet4Ue.cxotmernal components
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
+
2-CELL
AA
4.7µH
4.7µF
OFF ON
SW
VIN VOUT
KB3436
SHDN FB
GND
460K
200K
VOUT
3.3V
250mA
4.7µF
Figure 1. 2-Cell to 3.3V Synchronous Boost Converter
2-Cell to 3.3V Efficiency
100
VIN = 3V
90 EFFICIENCY
VIN = 2.4V
80
100
10
1
70
60
50
40
0.1
VIN = 2.4V
0.1
VIN = 3V 0.01
POWER LOSS
0.001
1 10 100
OUTPUT CURRENT (mA)
0.0001
1000
1
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3436
ABSOLUTE MAXIMUM RATINGS PACkAGE/ORDER INFORMATION
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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TOP VIEW
SW 1
GND 2
FB 3
●
6 VIN
5 VOUT
4 SHDN
TJMAX = 125°C, eJC = 102°C/W
ORDER PART
NUMBER
KB3436
TOP MARKING
DGABF
ELECTRICAL CHARACTERISTICS 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
CONDITIONS
MIN TYP MAX UNITS
Minimum Start-Up Voltage
Minimum Operating Voltage
Output Voltage Adjust Range
ILOAD = 1mA, VOUT = 0V
SHDN = VIN (Note 3)
(Note 5)
0.80
0.5 0.65
2.5 5
V
V
V
Feedback Voltage +/-2%
● 0.980 1.000 1.020
V
Feedback Input Current
Quiescent Current (Burst Mode Operation)
Quiescent Current (Shutdown)
Quiescent Current (Active)
NMOS Switch Leakage
PMOS Switch Leakage
NMOS Switch On Resistance
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
1 50
20 30
0.01 1
350 500
0.1 5
0.1 5
0.35
nA
µA
µA
µA
µA
µA
1
PMOS Switch On Resistance
0.45 1
NMOS Current Limit
600 850
mA
Burst Mode Operation Current Threshold
L = 4.7µH (LTC3429 Only)
1.25 mA
Current Limit Delay to Output
40 ns
Max Duty Cycle
Switching Frequency
VFB = 0.9V
● 80
90
● 500 650 800
%
kHz
SHDN Input High
1V
SHDN Input Low
0.35 V
SHDN Input Current
Soft-Start Time
VSHDN = 5.5V
SHDN to 90% of VOUT
0.01 1
2.5
µA
ms
2
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