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BLI9184 PDF даташит

Спецификация BLI9184 изготовлена ​​​​«SHANGHAI BELLING» и имеет функцию, называемую «3.0-A Synchronous Step-Down Converter».

Детали детали

Номер произв BLI9184
Описание 3.0-A Synchronous Step-Down Converter
Производители SHANGHAI BELLING
логотип SHANGHAI BELLING логотип 

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BLI9184 Даташит, Описание, Даташиты
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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BLI9184 Даташит, Описание, Даташиты
PIN ARRANGEMENT
BLI9184
PIN FUNCTIONS
NAME
BS
IN
SW
G
FB
COMP
EN
SS
PIN
NO.
1
2
3
4
5
6
7
8
Description
Details
Supply input for high-side NFET gate driver (boost terminal). Connect capacitor from
this pin to SW pin. An internal PN diode is connected between VREG to BS pin.
Power input and connected to high side NFET drain
Switch node connection between high-side NFET and low-side NFET. Also serve as
inputs to current comparators.
Signal ground pin, also serve as ground returns for low-side NFET.
Converter feedback input. Connect with feedback resistor divider.
Compensation Node. Used to compensate control loop. Connect a series RC
network from COMP to G. In some cases, an additional capacitor is required
Enable control input
Soft-start control. A external capacitor should be connected to G.
ABOSOLUTE MAXIMUM RATINGS
Over operating free-air temperature range (unless otherwise noted)
ITEMS
NAME
VALUE
IN -0.3 to 20
BS -0.3 to 25
Voltage Range
SW
SW (10 ns transient)
-2 to 20
-2.5 to 21
FB,SS,COMP
-0.3 to 5.5
EN -0.3 to 8
TJ
Operation Junction
-40 to +150
Tstg
Storage temperature
-55 to +150
UNIT
V
V
V
V
V
V
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BLI9184 Даташит, Описание, Даташиты
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
Page3
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