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KB3511 数据表(PDF) 1 Page - Kingbor Technology Co

部件名 KB3511
功能描述  High Efficiency, Low Noise, Fast Transient Dual 800mA, 2.2MHz Step-Down DC/DC Converter
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制造商  KINGBOR [Kingbor Technology Co]
网页  http://www.kingbor.com
标志 KINGBOR - Kingbor Technology Co

KB3511 数据表(HTML) 1 Page - Kingbor Technology Co

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1
Up to 97% Efficiency
25uA No Load Current Per Channel
800mA Output 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 1
µA Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
DFN33-10 Package
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 25
µA 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.
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
KB3511
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
APPLICATIONS
FEATURES
DESCRIPTION
TYPICAL APPLICATION
KB3511 Efficiency Curve
Figure 1. 3.3V/1.8V at 800mA Step-Down Regulators
LOAD CURRENT (mA)
1
100
95
90
85
80
75
70
65
60
10
100
1000
3.3V
1.8V
VIN=3.6V
1.3mm Height Core Supply
Dual 800mA, 2.2MHz Step-Down DC/DC Converter
High Efficiency, Low Noise, Fast Transient
System-Power
RUN1
VIN
VIN = 3.6V
TO 6.0V
VOUT2 = 3.3V
AT 800mA
VOUT1 = 1.8V
AT 800mA
RUN2
POR
SW2
VFB2
GND
VFB1
SW1
MODE/SYNC
C1
R5
100k
RESET
C4, 22pF
C5, 22pF
L1
2.2
µH
L2
2.2
µH
R4
680k
R2
300k
R1
150k
R3
150k
C3
4.7
µF
C2
4.7
µF
C1, C2, C3: 4.7uF 6.3V 0603
L1, L2: EVERCOM SD11-2R2 (3x3x1.2mm)
10
11
9
6
7
8
4
5
3
2
1
KB3511A
DFN3x3mm
RESET
4.7
µF
10
µ F
1
R1
*
*
* Vin>4.5V Used
C6


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