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PDF KB3440 Data sheet ( Hoja de datos )
| Número de pieza | KB3440 | |
| Descripción | Micropower Synchronous Buck-Boost DC/DC Converter | |
| Fabricantes | Kingbor Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de KB3440 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
kB3440
Micropower Synchronous
Buck-Boost DC/DC Converter
FEATURES
■ Single Inductor
■ Fixed Frequency Operation with Battery Voltages
Above, Below or Equal to the Output
www.Data■SheSeyt4nUc.hcormonous Rectification: Up to 96% Efficiency
■ 40µA Quiescent Current in Burst Mode® Operation
■ Up to 600mA Continuous Output Current
■ No Schottky Diodes Required (VOUT < 4.3V)
■ VOUT Disconnected from VIN During Shutdown
■ 2.5V to 5.5V Input and Output Range
■ Programmable Oscillator Frequency
from 300kHz to 2MHz
■ Synchronizable Oscillator
■ Burst Mode Enable Control
■ 5 µA Shutdown Current
■ Small Thermally Enhanced 10-Pin MSOP and
(3mm × 3mm) DFN Packages
APPLICATIONS
■ Palmtop Computers
■ Handheld Instruments
■ MP3 Players
■ Digital Cameras
DESCRIPTION
The kB3440 is a high efficiency, fixed frequency, Buck-
Boost DC/DC converter that operates from input voltages
above, below or equal to the output voltage. The topology
incorporated in the IC provides a continuous transfer
function through all operating modes, making the product
ideal for single lithium-ion, multicell alkaline or NiMH
applications where the output voltage is within the battery
voltage range.
The device includes two 0.191 N-channel MOSFET
switches and two 0.221 P-channel switches. Switching
frequencies up to 2MHz are programmed with an external
resistor and the oscillator can be synchronized to an
external clock. Quiescent current is only 40µA in Burst
Mode operation, maximizing battery life in portable appli-
cations. Burst Mode operation is user controlled and can
be enabled by driving the MODE/SYNC pin high. If the
MODE/SYNC pin has either a clock or is driven low, then
fixed frequency switching is enabled.
Other features include a 1µA shutdown, soft-start con-
trol, thermal shutdown and current limit. The kB3440 is
available in the 10-pin thermally enhanced MSOP and
(3mm × 3mm) DFN packages.
TYPICAL APPLICATION
Li-Ion to 3.3V at 600mA Buck-Boost Converter
L1
10µH
VIN = 2.7V TO 4.2V
3
SW1
4
SW2
7 kB3440
6
VIN VOUT
+
Li-Ion
8
SHDN/SS
FB
2
C1 *
MODE/SYNC VC
10µF 1
RT
GND
RT
60.4k
9
C5 1.5nF
10
R3
5 15k
R1
340k
R2
200k
*1 = Burst Mode OPERATION
0 = FIXED FREQUENCY
C1: TAIYO YUDEN JMK212BJ106MG
C2: TAIYO YUDEN JMK325BJ226MM
L1: SUMIDA CDRH6D38-100
VOUT
3.3V
600mA
C2
22µF
Efficiency vs VIN
100
98
VOUT = 3.3V
IOUT = 100mA
96 fOSC = 1MHz
94
92
90
88
86
84
82
80
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
1
1 page  
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
TYPICAL PERFORMANCE CHARACTERISTICS
kB3440
Feedback Voltage Line Regulation
90
VIN = VOUT = 2.5V TO 5.5V
80
www.DataSheet4U.com
70
Error Amp Sink Current
430
VIN = VOUT = 3.6V
410
390
370
PMOS RDS(ON)
0.30
VIN = VOUT = 3.6V
SWITCHES A AND D
0.25
0.20
0.15
60
–55 –25
5
35 65 95 125
TEMPERATURE (°C)
Boost Max Duty Cycle
90
VIN = VOUT = 3.6V
RT = 60k
85
80
75
350
–55 –25
5
35 65 95 125
TEMPERATURE (°C)
0.10
–55 –25
5
35 65 95 125
TEMPERATURE (°C)
Minimum Start Voltage
2.40
2.35
2.30
Current Limit
3000
2500
PEAK SWITCH
VIN = VOUT = 3.6V
2000
1500
AVERAGE INPUT
70
–55 –25
5
35 65 95 125
TEMPERATURE (°C)
2.25
–55 –25
5
35 65 95 125
TEMPERATURE (°C)
1000
–55 –25
5
35 65 95 125
TEMPERATURE (°C)
5
5 Page 
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
OPERATION
kB3440
SOFT-START
The soft-start function is combined with shutdown. When
the SHDN/SS pin is brought above typically 1V, the IC is
enabled but the EA duty cycle is clamped from the VC pin.
A detailed diagram of this function is shown in Figure 5.
The components RSS and CSS provide a slow ramping
voltage on the SHDN/SS pin to provide a soft-start
function.
www.DataSheet4U.com
VIN 15µA
SOFT-START
CLAMP
TO PWM
COMPARATORS
VCI
CHIP
ENABLE
ERROR AMP
+ 1.22V
FB
–9
VC CP1
10
VOUT
R1
R2
SHDN/SS
8
+
– 1V
RSS
CSS
ENABLE SIGNAL
Figure 5. Soft-Start Circuitry
APPLICATIONS INFORMATION
COMPONENT SELECTION
L1
D1
MULTIPLE
VIAS
1 RT
kB3440
2 MODE/SYNC
VC 10
FB 9
3 SW1
SW2
4
5 GND
D2 SHDN/SS 8
VIN 7
VOUT 6
C1
C2 VOUT
GND
R1 R2
VIN
Figure 6. Recommended Component Placement. Traces Carrying
High Current are Direct. Trace Area at FB and VC Pins are Kept
Low. Lead Length to Battery Should be Kept Short
Inductor Selection
The high frequency operation of the kB3440 allows the
use of small surface mount inductors. The inductor cur-
rent ripple is typically set to 20% to 40% of the maximum
inductor current. For a given ripple the inductance terms
are given as follows:
( )L >
VIN(MIN)2 • VOUT – VIN(MIN)
f • IOUT(MAX) • Ripple • VOUT2
µH,
( )L > VOUT • VIN(MAX) – VOUT
µH
f • IOUT(MAX) • Ripple • VIN(MAX)
where f = operating frequency, MHz
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet KB3440.PDF ] | |
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