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Kingbor Technology - Step-Down DC/DC Converter

Numéro de référence KB3511
Description Step-Down DC/DC Converter
Fabricant Kingbor Technology 
Logo Kingbor Technology 





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KB3511 fiche technique
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3511
System-Power
High Efficiency, Low Noise, Fast Transient
Dual 800mA, 2.2MHz Step-Down DC/DC Converter
FEATURES
Up to 97% Efficiency
25uA No Load Current Per Channel
www.DataShe8e0t40Um.cAomOutput Current
2.5V to 6.5V Input Voltage Range
2.2MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws ) 1µA Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
DFN33-10 Package
APPLICATIONS
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
DESCRIPTION
The KB3511 is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. The device is available in an adjustable
version and fixed output voltages of 1.8V and 3.3V. Supply
current during operation is only 25µA and drops to )1µA
in shutdown. The 2.5V to 6.5V input voltage range makes
the KB3511 ideally suited for single Li-Ion battery-pow-
ered applications. 100% duty cycle provides low dropout
operation, extending battery life in portable systems.
Automatic Trickle Mode operation increases efficiency at
light loads, further extending battery life.
Switching frequency is internally set at 2.2MHz, allowing
the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. The KB3511 is available in a low
profile (0.8mm) DFN33-10 package.
TYPICAL APPLICATION
VIN = 3.6V
TO 6.0V
C6
*10µ F
* Vin>4.5V Used R1
*1
VOUT2 = 3.3V
AT 800mA
C1
4.7µF
RESET
L2
2.2µH
C5, 22pF
23
RUN1 VIN
6 MODE/SYNC
9
RUN2
POR 8
KB3511A
4 SW1
SW2 7
DFN3x3mm
R5
100k
RESET
L1
2.2µH
C4, 22pF
C3
4.7µF
R4
680k R3
150k
1
VFB1
GND
11 5
VFB2 10
R2
R1 300k
150k
VOUT1 = 1.8V
AT 800mA
C2
4.7µF
C1, C2, C3: 4.7uF 6.3V 0603
L1, L2: EVERCOM SD11-2R2 (3x3x1.2mm)
Figure 1. 3.3V/1.8V at 800mA Step-Down Regulators
1.3mm Height Core Supply
KB3511 Efficiency Curve
VIN=3.6V
100
95 3.3V
90 1.8V
85
80
75
70
65
60
1
10 100 1000
LOAD CURRENT (mA)
1

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