KB3436 Datasheet, PDF (1/11 Pages) Kingbor Technology Co – 600mA, 650kHz Micropower Synchronous Boost Converter with Output Disconnect

Kingbor Technology Co.,Ltd
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KB3436
600mA, 650kHz Micropower
Synchronous Boost Converter
with Output Disconnect
FEATURES
ƒ Up to 96% efficiency
ƒ Low start-up voltage 0.8V
ƒ Internal synchronous rectifier
ƒ Up to 2MHz switching allows for tiny
external components
ƒ 0.5V to 4.4V input range
ƒ 2.5V to 5.0V output range (Note 3)
ƒ Feedback Voltage: 1.00V +/-2%
ƒ Logic controlled shutdown (<1µA)
ƒ Low 250µA operating supply current
(measured at VOUT)
ƒ Pulse skipping at light load for extended
battery life
ƒ Generates 3.3V at 100mA from single AA
cell
ƒ Stable with ceramic output capacitor
ƒ 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
ƒ PDAs and organizers
ƒ Digital cameras
ƒ Wireless mice/ keyboards
ƒ Portable medical equipment
ƒ Cordless phones
ƒ Wireless Headsets
TYPICAL APPLICATION
+
2-CELL
AA
4.7µH
4.7µF
OFF ON
SW
V_IN V_OUT
KB3436
SHDN FB
GND
460K
200K
V_OUT
3.3V
250mA
4.7µF
Figure 1. 2-Cell to 3.3V Synchronous Boost Converter
2-Cell to 3.3V Efficiency
100
100
V_IN = 3V
90 EFFICIENCY
10
V_IN = 2.4V
80
1
70
60
50
40
0.1
V_IN = 2.4V
0.1
V_IN = 3V _0.01
POWER LOSS
0.001
1
10
100
OUTPUT CURRENT (mA)
0.0001
1000
1