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SC4505 PDF даташит

Спецификация SC4505 изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «High Efficiency Boost Converter».

Детали детали

Номер произв SC4505
Описание High Efficiency Boost Converter
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC4505 Даташит, Описание, Даташиты
POWER MANAGEMENT
Description
The SC4505 is a high-frequency PWM current-mode step-
up switching regulator with an integrated 2A power tran-
sistor. Its high switching frequency (1MHz) allows the use
of tiny surface-mount external passive components. The
internal switch is rated at 36V which makes the con-
verter ideal for multiple LED series operation with opti-
mal current matching. Two programmable independent
current source structure allows dual panel LED backlight
and flash operation.
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The operating frequency of the SC4505 is set at 1MHz.
The selected operating frequency gives the SC4505 de-
sign flexibility for size, cost and efficiency optimization.
The SC4505 is available in thermally enhanced 16-pin
MLPQ package (3x3x0.9mm) with embedded over tem-
perature protection.
SC4505
High Efficiency Boost Converter
for Backlight/Flash LED Driver
Features
‹ Two independent current sources for dual LED strands
with optimal current/light matching. Backlight up to
75mA, Flash up to 125mA
‹ Wide input range from 2.6V to 12V
‹ Adaptive output voltage up to 28V with OVP protec-
tion against open circuit conditions
‹ Low shutdown current (<1µA )
‹ Internal Flash/Torch mode with flash timeout to pro-
tect LEDs
‹ 1MHz Fixed Frequency Current-Mode Control
‹ Internal 2A current limit for driving large numbers of
LEDs
‹ Supports PWM Dimming from 50Hz to 50kHz
‹ Internal undervoltage lockout
‹ Small, low profile, thermally enhanced 16-MLPQ pack-
age is fully WEEE and RoHS compliant
Typical Application Circuit
Applications
‹ White LED power supplies
‹ Flat screen LCD bias supplies
‹ TFT bias supplies
‹ Dual panel Handset/Liquid Crystal Display Monitor
‹ Portable media players
‹ Digital video cameras
‹ Digital still cameras
VIN: 2.6V ~ 6.0V
PGND
C2
2.2u
L1
IHLP-2525CZ-01-1R5-M-01
LED: SML-LX0603UWD
D1
21
10BQ015
D2
LED
C1
D3
LED
2.2uF
0 16
FL_TRB
EN_FL
EN_BL
AGND
C3 15
0.33uF
14
13
12
11
RO1SET
6.98k
10
9
RO2SET
1.54k
VIN
FTO
FL_TRB
EN_FL
EN_BL
IO1SET
IO2SET
AGND
SC4505
PGND 1
PGND 2
SW 3
SW 4
VO 5
IO2 6
IO1 7
COMP 8
0
R1
1.47k C6
12n
0 D4
LED
D5
LED
D6 D7
LED LED
C4
12n
(Optional)
C5
12n
(Optional)
0
Power
Ground
0
Analog
Ground
0
Boost Converter Efficiency vs Input Voltage
(2 String of 3 LEDs @30mA)
87
85
83
81
79
77
2.5
3 3.5 4 4.5
Input Voltage (V)
5
All Capacitors are Ceramic.
Figure 1. SC4505 Application Circuit for Backlight and Flashlight LED Driver
Revision: December 15, 2006
1
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SC4505 Даташит, Описание, Даташиты
SC4505
POWER MANAGEMENT
Absolute Maximum Rating
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified
in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device
reliability.
Parameter
Symbol
Typ Units
Supply Voltage
SW Voltage, Output Voltage, Current Source Voltage
I0SET Voltage
FTO Voltage
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EN_BL, EN_FL, FL_TRB Voltage
Thermal Resistance Junction to Ambient
Maximum Junction Temperature
Storage Temperature Range
IR Reflow (Soldering) 10s to 30s
ESD Rating (Human Body Model)
VIN
VSW, VO, VIO1, VIO2
V VIO1SET, IO2SET
VFTO
VEN_BL, VEN_FL
VFL_TRB
θJA
TJ
TSTG
TPKG
ESD
-0.3 to 20
-0.3 to 36
-0.3 to 2
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
37
150
-65 to +150
260
1
V
V
V
V
V
°C/W
°C
°C
°C
kV
Electrical Characteristics
Unless specified: VIN = 3.6V, -40°C < TA = TJ < 85°C, ,RO1SET=6.98KRO2SET=1.54K
Parameter
Test Conditions
Supply Input Voltage VIN
UVLO Threshold
UVLO Hysteresis
VIN rising
VIN Supply Current
VIN Supply Current in Shutdown
Switching Frequency
Maximum Duty Cycle
Not switching
EN_FL = FL_TRB = EN_BL = 0
TJ = 25°C
Minimum Duty Cycle
Switch Current Limit
Switch Leakage Current
Switch Saturation Voltage
EN_FL, FL_TRB, EN_BL
High Voltage
VSW = 28V
ISW = 1A
VIN = 2.6V to 4.7V
EN_FL, FL_TRB, EN_BL
Low Voltage
VIN = 2.6V to 4.7V
2006 Semtech Corp.
2
Min
2.6
0.8
85
1.75
2
Typ
2.45
50
1.7
1
90
2.25
0.01
300
Max
12
2.59
1.0
1.2
0
1
Unit
V
V
mV
mA
µA
MHz
%
%
A
µA
mV
V
0.4 V
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SC4505 Даташит, Описание, Даташиты
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VIN = 3.6V, -40°C < TA = TJ < 85°C, ,RO1SET=6.98KRO2SET=1.54K
Parameter
Test Conditions
EN_FL, FL_TRB, EN_BL
Input Current
VEN_FL = 0V to 4.7V
EN_BL PWM Dimming
Control Frequency
Note 1
EN_BL PWM Dimming
Control Duty Cycle
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FTO Sourcing Current
Note 1
EN_FL = FL_TRB = 1
FTO Trip Threshold Voltage
FTO Pull Down Current
EN_FL = 1, FL_TRB = 0
Overvoltage Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Backlight Current Accuracy ( I O1 )
Max Backlight Current ( I O1 )
Flash Current Accuracy ( I O2 )
Max Flash Current ( I O2 )
Torch Output Current ( I O2 )
IO1 Off Leakage Current
IO2 Off Leakage Current
VO Pulldown in Overvoltage Fault
Note 1: Guaranteed by Design
EN_BL = 1
TJ = 25°C, RO1SET =6.98K
EN_FL = FL_TRB = 1
TJ = 25°C, RO2SET =1.54K
EN_FL=1, FL_TRB=0
TJ = 25°C, RO2SET =1.54K
VIO1 =28V
VIO2 =28V
SC4505
Min Typ Max Unit
0.01 1 µA
50 50K Hz
0 100 %
1.2 µA
1.25 V
2.6 mA
28 V
155 °C
10 °C
19 20 21 mA
75 mA
92 100 108 mA
125 mA
18 mA
0.1 1 µA
0.1 1 µA
7 K
2006 Semtech Corp.
3
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