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PDF KB3436 Data sheet ( Hoja de datos )
| Número de pieza | KB3436 | |
| Descripción | Micropower Synchronous Boost Converter | |
| Fabricantes | Kingbor Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de KB3436 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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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
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
1 page  
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3436
PIN FUNCTIONS
SW (Pin 1): Switch Pin. Connect inductor between SW
and VIN. Keep these PCB trace lengths as short and wide
as possible to reduce EMI and voltage overshoot. If the
inductor current falls to zero, or SHDN is low, an internal
1501 antiringing switch is connected from SW to VIN to
minimize EMI.
GND (Pin 2): Signal and Power Ground. Provide a short
direct PCB path between GND and the (–) side of the output
www.DataShceaept4aUc.citoomr(s).
FB (Pin 3): Feedback Input to the gm Error Amplifier.
Connect resistor divider tap to this pin. The output voltage
can be adjusted from 2.5V to 5V by:
VOUT = 1.00V • [1 + (R1/R2)]
SHDN (Pin 4): Logic Controlled Shutdown Input.
SHDN = High: Normal free running operation, 650kHz
typical operating frequency.
SHDN = Low: Shutdown, quiescent current < 1µA.
Output capacitor can be completely discharged through
the load or feedback resistors. A 1501 resistor is
internally connected between SW and VIN.
VOUT (Pin 5): Output Voltage Sense Input and Drain of the
Internal Synchronous Rectifier MOSFET. Bias is derived
from VOUT. PCB trace length from VOUT to the output filter
capacitor(s) should be as short and wide as possible. VOUT
is completely disconnected from VIN when SHDN is low
due to the output disconnect feature.
VIN (Pin 6): Battery Input Voltage. The device gets its
start-up bias from VIN. Once VOUT exceeds VIN, bias
comes from VOUT. Thus, once started, operation is com-
pletely independent from VIN. Operation is only limited by
the output power level and the battery’s internal series
resistance.
SIMPLIFIED BLOC DIAGRAM
+
1V TO 4.4V
6 VIN
CIN
RAMP
GEN
650kHz
START-UP
OSC
A A/B
MUX
B
PWM
CONTROL
PWM
COMPARATOR
SLOPE
COMP
SLEEP
Burst Mode
OPERATION
CONTROL
L1
1 SW
VOUT
GOOD
2.3V
0.451
VIN
WELL
SWITCH
VOUT
5
2.5V TO 5V
SYNC
DRIVE
CONTROL
Y
0.351
CURRENT
SENSE
CPL
(OPTIONAL)
R1
RC
80k
CC
150pF
CP2
2.5pF
gm
ERROR
AMP
FB
3
1.00V
REF
R2
SHDN
4
SHUTDOWN
CONTROL
SHUTDOWN
2 GND
COUT
5
5 Page 
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
PACAGE DESCRIPTION
Small Outline SOT23-6
be
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E
KB3436
A A2
e1
D
C
A1
E1
L
r
SYMBOL
A
A1
A2
b
C
D
E
E1
L
e
e1
r
INCHES
MIN MAX
0.035
0.057
0.000
0.006
0.035
0.051
0.010
0.020
0.003
0.008
0.110
0.122
0.102
0.118
0.059
0.069
0.014
0.022
0.037ref
0.075ref
00 100
MILLIMETERS
MIN
MAX
0.90 1.45
0.00 0.15
0.90 1.30
0.25 0.50
0.08 0.20
2.80 3.10
2.60 3.00
1.50 1.75
0.35 0.55
0.95ref
1.90ref
00 100
NOTES
-
-
-
-
-
-
-
-
-
Kingbor Technology
TEL:(86) 0755-26508846 FAX: (86) 0755-26509052 www.kingbor.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet KB3436.PDF ] | |
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