Instrukcja obsługi Microchip MIC22705

Microchip Niesklasyfikowane MIC22705

Przeczytaj poniżej 📖 instrukcję obsługi w języku polskim dla Microchip MIC22705 (30 stron) w kategorii Niesklasyfikowane. Ta instrukcja była pomocna dla 7 osób i została oceniona przez 2 użytkowników na średnio 4.5 gwiazdek

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2020 Microchip Technology Inc. DS20006307A-page 1
MIC22705
Features
• Input Voltage Range: 2.9V to 5.5V
• Output Voltage Adjustable Down to 0.7V
• Output Load Current Up to 7A
• Safe Start-Up into a Pre-Biased Output Load
• Full Sequencing and Tracking Ability
• Power Good Output
• Efficiency >95% Across a Broad Load Range
• Ultra-Fast Transient Response
• Easy RC Compensation
• 100% Maximum Duty Cycle
• Fully Integrated MOSFET Switches
• Thermal Shutdown and Current-Limit Protection
• 24-Pin 4 mm x 4 mm QFN
• –40°C to +125°C Junction Temperature Range
Applications
• High Power Density Point-of-Load Conversion
• Servers, Routers, and Base Stations
• Blu-Ray/DVD Players and Recorders
• Computing Peripherals
• FPGAs, DSP, and Low Voltage ASIC Power
General Description
The MIC22705 is a highly efficient, 7A, integrated
switch, synchronous buck (step-down) regulator. The
MIC22705 is optimized for highest efficiency, achieving
more than 95% efficiency while still switching at 1 MHz
over a broad range. The ultra-high speed control loop
keeps the output voltage within regulation even under
extreme transient load swings commonly found in
FPGAs and low-voltage ASICs. The output voltage is
pre-bias safe and can be adjusted down to 0.7V to
address all low-voltage power needs.
The MIC22705 offers a full range of sequencing and
tracking options. The Enable/Delay (EN/DLY) pin,
combined with the Power Good (PG) pin, allows
multiple outputs to be sequenced in any way during
turn-on and turn-off. The Ramp Control (RC) pin allows
the device to be connected to another product in the
MIC22xxx and/or MIC68xxx family, to keep the output
voltages within a certain V on start-up.∆
The MIC22705 is available in a 24-pin 4mm x 4mm
QFN with a junction operating range from –40°C to
+125°C.
Package Type
MIC22705
24-Lead 4 mm x 4 mm QFN (ML)
(Top View)
PVIN
EN/DLY
NC
RC
PG
PVIN
PVIN
SVIN
SGND
COMP
FB
PVIN
PGND
SW
SW
SW
SW
PGND
PGND
SW
SW
SW
SW
PGND
EP
1
2
3
4
5
6
7 8 9 10 11 12
13
14
15
16
17
18
19202122
2324
1 MHz, 7A Integrated Switch, High Efficiency Synchronous Buck Regulator
MIC22705
DS20006307A-page 2 2020 Microchip Technology Inc.
Typical Application Circuit
PVIN SW
FBPG
22μF
x4
VOUT
1.8V/7A
1.0μH
PGND
47μF
x2
MIC22705
PG
COMP
VIN
2.9V to 5.5V
EN/DLYEN
47.5Nȍ
SGND
20Nȍ
39pF
SVIN
RC
470pF1.0nF
EP R1
1.10Nȍ
R2
69ȍ
Functional Block Diagram
1.0μH
47μF
x2
MIC22705
EN SW
FB
EN/DLY
PGND
SVIN
PVIN VIN
2.9V to 5.5V
22μF
x4
gm EA
COMP
CONTROL
LOGIC
CLOCK
UVLO
THERMAL
SHUTDOWN
PVIN
SGND
PG
47.5Nȍ
VIN
PG
HSD
LSD
40mV
CURRENT
LIMIT
1μA
RC
1.0nF
39pF
20k
1.0nF
240Nȍ 50pF 120Nȍ
120Nȍ
COMP
OPEN
90%
VREF
VOUT
1.8V/7A
R1
1.10Nȍ
R2
69ȍ
1μA
1μA
SVIN
VREF
0.7V
1μA
1μA
VDD
DELAY
2020 Microchip Technology Inc. DS20006307A-page 3
MIC22705
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
PVIN to PGND .............................................................................................................................................. –0.3V to +6V
SVIN to PGND .............................................................................................................................................–0.3V to PV
IN
VSW to PGND..............................................................................................................................................–0.3V to PV
IN
VEN/DLY to PGND ........................................................................................................................................–0.3V to PV
IN
VPG to PGND ..............................................................................................................................................–0.3V to PV
IN
PGND to SGND ........................................................................................................................................ –0.3V to +0.3V
ESD Rating ............................................................................................................................................................ Note 1
Operating Ratings ††
Supply Voltage .......................................................................................................................................... +2.9V to +5.5V
Power Good Voltage (VPG) .............................................................................................................................. 0V to PV
IN
Enable Input (VEN/DLY).....................................................................................................................................0V to PV
IN
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
†† Notice: The device is not guaranteed to function outside its operating ratings.
Note 1: Devices are ESD sensitive. Handling precautions recommended.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: SVIN = PVIN = VEN/DLY = 3.3V, VOUT = 1.8V, TA = +25°C, unless noted. values Bold
indicate –40°C T≤J +125°C. ≤Note 1
Parameter Sym. Min. Typ. Max. Units Conditions
Power Input Supply
Supply Voltage Range PVIN 2.9 5.5— V —
UVLO Trip Level — 2.75 V PV2.55 2.9 IN rising
UVLO Hysteresis — — 420 — mV —
Quiescent Supply Current — — 0.85 mA V1.3 FB = 0.9V (not switching)
Shutdown Current ISHDN — 5 A V10 μEN/DLY = 0V
Reference
Feedback Voltage VFB 0.686 0.7140.7 V —
FB Bias Current — — 10 — nA VFB = 0.5V
Load Regulation — — 0.2 — % IOUT = 100 mA to 7A
Line Regulation — — 0.2 — % VIN = 2.9V to 5.5V; IOUT = 100 mA
Enable Control
EN/DLY Threshold Voltage — 1.24 V —1.14 1.34
EN Hysteresis — — 10 — mV —
EN/DLY Bias Current — 1.0 A0.6 1.8 μVEN/DLY = 0.5V; VIN = 2.9V and
VIN = 5.5V
RC Ramp Control
RC Pin Source Current IRAMP 0.5 1 1.7 A VμRC = 0.35V
Note 1: Specification for packaged product only.

Specyfikacje produktu

Marka: Microchip
Kategoria: Niesklasyfikowane
Model: MIC22705

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