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SC419 PDF даташит

Спецификация SC419 изготовлена ​​​​«Semtech» и имеет функцию, называемую «DC-DC Converter».

Детали детали

Номер произв SC419
Описание DC-DC Converter
Производители Semtech
логотип Semtech логотип 

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SC419 Даташит, Описание, Даташиты
SC419
POWER MANAGEMENT
Features
Power system
Input voltage — 3V to 28V
Integrated bootstrap switch
1% reference tolerance -40 to +85 °C
EcoSpeedTM architecture with pseudo-fixed fre-
quency adaptive on-time control
Internal soft-start and soft-shutdown at output
SmartDriveTM
Logic input/output control
Independent control EN for LDO and switcher
Programmable VIN UVLO threshold
Power good output
Selectable power save mode
Programmable ultrasonic power save mode
Protections
Over-voltage/under-voltage
TC compensated RDS(ON) sensed current limit
Thermal shutdown
Smart power save
Output capacitor types
High ESR — SP, POSCAP, OSCON
Ceramic capacitors
Package — 3 x 3mm, 20-pin MLPQ
Lead-free and halogen free
RoHS and WEEE compliant
Applications
Office automation and computing
Networking and telecommunication equipment
Point-of-load power supplies and module replacement
EcoSpeedTM DC-DC Converter
with Integrated Boost Diode
Description
The SC419 is a synchronous buck power supply controller.
It features a bootstrap switch in a space-saving MLPQ-
3 x 3mm 20-pin package. The device is highly efficient
and uses minimal PCB area. It uses pseudo-fixed frequency
adaptive on-time operation to provide fast transient
response.
The SC419 supports using standard capacitor types such
as electrolytic or special polymer in addition to ceramic, at
switching frequencies up to 1MHz. The programmable
frequency, synchronous operation, and programmable
power-save provide high efficiency operation over a wide
load range.
Additional features include cycle-by-cycle current limit,
soft-start, under and over-voltage protection, program-
mable over-current protection, soft shutdown, selectable
power-save modes, and programmable ultra-sonic power-
save. The device also provides an enable input and a
power good output, useful for sequencing multiple
devices.
The input voltage can range from 3V to 28V. The wide
input voltage range and programmable frequency make
the device extremely flexible and easy to use in a broad
range of applications. Support is provided for single cell
or multi-cell battery systems in addition to traditional DC
power supply applications.
Typical Application Circuit
VIN
VIN
5V
PGOOD
ENABLE
RTON
5V
0.1µF
1µF
PSV
VIN
PGOOD
EN
TON
VDDA
VDDP
SC419
DH
LX
BST
ILIM RILIM
DL
VOUT
PSV
AGND
PGND
FB
VIN
L1
CIN
+ COUT
VOUT
July 27, 2010
© 2010 Semtech Corporation










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SC419 Даташит, Описание, Даташиты
SC419
Pin Configuration
20 19 18 17 16
FB 1
Top View
15 PGOOD
NC
VDDA
2
3
AGND PAD
14 PSV
13 VDDP
VOUT
4
12 DL
NC 5
11 PGND
6 7 8 9 10
Ordering Information
Device
Package
SC419ULTRT(1)(2)
MLPQ-UT20
SC419EVB
Evaluation Board
Notes:
1) Available in tape and reel only. A reel contains 3000 devices.
2) Lead-free packaging only. Device is WEEE and RoHS compliant
and halogen-free.
MLPQ-UT20
Marking Information
419
yyww
xxxx
yyww = Date Code
xxxx = Semtech Lot Number










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SC419 Даташит, Описание, Даташиты
SC419
Absolute Maximum Ratings(1)
Recommended Operating Conditions
LX to PGND (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 to +30
LX to PGND (V) (transient — 100ns) . . . . . . . . . . . . -2 to +30
DH, BST to PGND (V). . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +35
DH, BST to LX (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6
DL to PGND (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6
VIN to PGND (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +30
EN, FB, ILIM, to AGND (V). . . . . . . . . . . . -0.3 to +(VDDA + 0.3)
PGOOD, PSV, VOUT to AGND (V). . . . . -0.3 to +(VDDA + 0.3)
TON to AGND (V). . . . . . . . . . . . . . . . . . . -0.3 to +(VDDA -1.5)
VDDP to PGND, VDDA to AGND (V) . . . . . . . . . . . . 0.3 to +6
VDDA to VDDP (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +0.3
AGND to PGND (V). . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +0.3
Input Voltage (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 to 28
VDDA to AGND (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 to 5.5
VDDP to PGND (V). . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 to 5.5
VOUT to AGND (V). . . . . . . . . . . . . . . . . . . . . . . 0.5 to VDDA
Thermal Information
Storage Temperature (°C). . . . . . . . . . . . . . . . . . . . . -60 to +150
Maximum Junction Temperature (°C). . . . . . . . . . . . . . . 150
Operating Junction Temperature (°C). . . . . . . . . -40 to +125
Thermal resistance, junction to ambient(2) (°C/W). . . . . . 50
Peak IR Reflow Temperature (°C). . . . . . . . . . . . . . . . . . . . 260
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) This device is ESD sensitive. Use of standard ESD handling precautions is required.
(2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless specified: VIN =12V, VDDA = VDDP = 5V, TA = +25°C for Typ, -40 to +85 °C for Min and Max, TJ < 125°C, Typical Application Circuit
Parameter
Conditions
Min Typ Max
Units
Input Supplies
Input Supply Voltage
3 28 V
VDDA, VDDP Voltage
4.5 5.5 V
VDDA UVLO Threshold
Measured at VDDA pin, rising edge
Measured at VDDA pin, falling edge
3.7 3.9 4.1
V
3.5 3.6 3.75
VDDA UVLO Hysteresis
0.3 V
VIN Supply Current
EN = AGND
8.5 20 μA
EN = AGND
3 7 μA
VDDA + VDDP Supply Current
FB On-Time Threshold
EN = 5V, RPSV = 115kΩ, VFB > 500mV(1)
EN = 5V, PSV = open (float), VFB > 500mV(1)
Operating fSW = 250kHz, PSV = VDDA, no load(1)
Static VIN and load, 0 to +85 °C
Static VIN and load, -40 to +85 °C
0.496
0.495
3
0.7
10
0.500
0.504
0.505
mA
V
V











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