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PDF BLI9184 Fiche technique - SHANGHAI BELLING

Numéro de référence BLI9184
Description 3.0-A Synchronous Step-Down Converter
Fabricant SHANGHAI BELLING 
Logo SHANGHAI BELLING Logo 

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BLI9184 Datasheet, Description
BLI9184
4.75V to 18V Input, 3.0-A Synchronous Step-Down Converter with +/-1.5% High Accuracy
Features
3.0-A Output Current
High Efficient Integrated FETs Optimized for
portable application:
85m(High side) and 75m(Low side)
High Efficiency
Up to 96% Efficiency @ 5V Input, 3.3V Output
Up to 94% efficiency @ 12V Input, 3.3V Output
Wide Input Voltage Range: 4.75V to 18V @
3.0-A loading
Wide Output Voltage Range: 0.923V to 14V @
3.0-A loading ( 54Watt output @max)
Low Output Ripple and Allows Ceramic Output
Capacitor
Thermal Shutdown Protection
340-KHz Switching Frequency(fsw)
Cycle By Cycle Over Current Limit
+/-1.5% High Accuracy Feedback Voltage
Applications
Wide Range of Applications for Low Voltage
System
- Digital TV Power Supply
- High Definition Blu-ray Disc Players
- Networking Home Terminal
- Digital STB
- Ideal for Portable Applications
Descriptions
The BLI9184 is a current mode synchronous
buck converter, and has a proprietary W-mode™®
Gm curvature circuit that enables fast transient
response, enables the device to adopt to both low
ESR output capacitors, such as POSCAP or
SP-CAP, and ultra-low ESR ceramic capacitors.
The BLI9184 operates from 4.75-V to 18-V Vin
input, and the output voltage can be programmed
between 0.923V to 14v with 3.0A output current,
and +/-1.5% high accuracy output voltage.
Due to 85m(High side) and 75m(Low side)
integrated FETs, the BLI9184 works in high
efficiency (up to 94% @12V Input, 3.3V output) .
Typical Application
Input 4.3V – 18V
C3 10nF
C1
10µF/25V
Ceramic
C8
0.47µF
R4 100K 2
1
IN
7
EN
BS 3
SW
8 FB 5
SS COMP G
64
C4
6.8nF
R3
2.2K
L1 10µH
R1 26.1K
1%
R2 10K
1%
Output
3.3V 3A
Cout
10µF/4.5V
Ceramic
X2
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V1.3
BLI9184 Fiche technique
BLI9184
ELECTRICAL CHARACTERISTICS
Over operating free-air temperature range(unless otherwise noted)
VIN=12V, TA=25
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
Supply Current
Iin Operating-non-switching
supply VIN current, TA=25, EN=1.8V,
1.3 2.0 mA
current
VFB=1.0V
ISDN
Shut Down Supply Current
VEN=0V
2 4 µA
VFB
Feedback Voltage
4.3V VIN18V
0.900 0.925 0.95 V
OVP
Feedback Overvoltage Threshold
1.1 V
Aea Error Amplifier Voltage Gain
Gea Error Amplifier Transconductance IC=+/-10µA
1000
900
V/V
µA/V
RDS(on)_1 High Side Switch ON Resistance
85 m
RDS(on)_2 Low Side Switch ON Resistance
75 m
Ileakgae High Side Switch Leakage Current VEN=0V, VSW=0V
10 µA
ILM_H
High Side Switch Current Limit
Minimum Duty Cycle
3.8 4.5
A
ILM_L
Low Side Switch Current Limit
From Drain to Source
1.0 A
Gcs COMP Voltage to Current Sense
Transconductance
3.5 A/V
Fsw_1
Switching Frequency
340 KHz
Fsw_2
Short Circuit Switching Frequency VFB=0V
100 KHz
Dmax
Maximum Duty Cycle
VFB=1.0V
90 %
TON_min Minimum ON Time
220 ns
VEN_1
EN Threshold Voltage
VEN Rising
1.1 1.5 2.0 V
VHys_1
EN Threshold voltage’s Hysteresis
100 mV
VEN_2
EN Lockout Threshold Voltage
1.8 2.0 2.2 V
VHys_2
EN Lockout Hysteresis
210 mV
VUVLO
Input Under Voltage Lockout VIN Rising
Threshold
3.0 3.6 4.2 V
VHys_3
Input Under Voltage Lockout
Threshold Hysteresis
600 mV
Iss Soft-Start Current
Vss=0V
4.25 4.40 4.55 µA
Tss
TSD
Soft-Start Period
Thermal Shutdown
Css=0.1µF
14 ms
160
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V1.3

3 Page

BLI9184 pdf
BLI9184
APPLICATION SCHEMATIC (2)
2) Fast Transient Response Without Electrolytic Capacitor
Input 4.75V – 18V
C3 10nF
C2
10µF/25V
Ceramic
C8
0.47µF
R4 100K
2
IN
7
EN
8
SS COMP
1
BS 3
SW
FB
G
5
64
C4
1.0nF
R3
3.0K
R2 20K
1%
L1 2.2µH
4A
Output
R1 6.3K 1%
1.20V 3.0A
Cff
1.0nF
C6 & C7
22µF/6.3V
Ceramic
X2
Figure 2
RECOMMENDED COMPONENT SELECTION
Vout
Cout
1.0V
1.2V
1.8V
2.5V
3.3V
5.0V
1.0V
1.2V
1.8V
2.5V
3.3V
5.0V
22µF Ceramic X2
22µF Ceramic X2
22µF Ceramic X2
22µF Ceramic X2
22µF Ceramic X2
22µF Ceramic X2
47µF SP Cap
47µF SP Cap
47µF SP Cap
47µF SP Cap
47µF SP Cap
47µF SP Cap
R1 R2
2.0K
6.3K
19.4K
34.5K
52.2K
89.5K
2.0K
6.3K
19.4K
34.5K
52.2K
89.5K
20K
20K
20K
20K
20K
20K
20K
20K
20K
20K
20K
20K
R3
(comp)
3.0K
3.0K
3.0K
3.0K
3.0K
3.0K
3.0K
3.0K
3.0K
3.0K
3.0K
3.0K
C4
(comp)
1.0nF
1.0nF
1.0nF
1.0nF
1.0nF
1.0nF
1.0nF
1.0nF
1.0nF
1.0nF
1.0nF
1.0nF
Cff
2.2nF
1.0nF
680pF
680pF
680pF
390pF
2.2nF
1.0nF
680pF
680pF
680pF
390pF
L
inductor)
2.2µH
2.2µH
3.3µH
4.7µH
6.8µH
22µH
2.2µH
2.2µH
3.3µH
4.7µH
6.8µH
22µH
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