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
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
V
IN
= 3V
90
V
OUT
3.3V
250mA
4.7µF
200K
EFFICIENCY (%)
+
EFFICIENCY
V
IN
= 2.4V
10
POWER LOSS (W)
2-CELL
AA
4.7µF
V
IN
SW
V
OUT
460K
FB
80
70
60
50
40
0.1
1
0.1
V
IN
= 3V
0.01
KB3436
OFF ON
SHDN
GND
V
IN
= 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 [ KINGBOR TECHNOLOGY CO ]
