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PDF MIC2875 Data sheet ( Hoja de datos )
| Número de pieza | MIC2875 | |
| Descripción | Synchronous Boost Regulator | |
| Fabricantes | Microchip | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC2875 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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MIC2875
4.8A ISW, Synchronous Boost Regulator
with Bi-Directional Load Disconnect
Features
• Up to 95% Efficiency
• Input Voltage Range: 2.5V to 5.5V
• Fully-Integrated, High-Efficiency, 2 MHz
Synchronous Boost Regulator
• Bi-Directional True Load Disconnect
• Integrated Anti-Ringing Switch
• Minimum Switching Frequency of 45 kHz
• <1 μA Shutdown Current
• Bypass Mode for VIN ≥ VOUT
• Overcurrent Protection and Thermal Shutdown
• Fixed and Adjustable Output Versions
• 8-pin 2 mm × 2 mm TDFN Package
Applications
• Tablet and Smartphones
• USB OTG and HDMI Hosts
• Portable Power Reserve Supplies
• Low-Noise Audio Applications
• Portable Equipment
Package Type
MIC2875 (FIXED OUTPUT)
8-Pin 2x2 TDFN* (MT)
(Top View)
General Description
The MIC2875 is a compact and highly-efficient 2 MHz
synchronous boost regulator with a 4.8A switch. It
features a bi-directional load disconnect function which
prevents any leakage current between the input and
output when the device is disabled. The MIC2875
operates in bypass mode automatically when the input
voltage is greater than the target output voltage. At light
loads, the boost converter goes to the PFM mode to
improve the efficiency.
To minimize switching artifacts in the audio band, the
MIC2875 is designed to operate with a minimum
switching frequency of 45 kHz. The MIC2875 also
features an integrated anti-ringing switch to minimize
EMI.
The MIC2875 is available in a 8-pin 2 mm × 2 mm Thin
DFN (TDFN) package, with a junction temperature
range of –40°C to +125°C.
MIC2875 (ADJ. OUTPUT)
8-Pin 2x2 TDFN* (MT)
(Top View)
SW 1 ▲
PGND 2
IN 3
AGND 4
EP
8 OUT
7 /PG
6 EN
5 OUTS
SW 1 ▲
PGND 2
IN 3
AGND 4
EP
8 OUT
7 /PG
6 EN
5 FB
* Includes exposed thermal pad (EP), see Table 3-1.
2015 Microchip Technology Inc.
DS20005549A-page 1
1 page  
MIC2875
TABLE 1-1: ELECTRICAL CHARACTERISTICS (CONTINUED)(Note 1)
Electrical Characteristics: VIN = 3.6V, VOUT = 5V, CIN = 4.7 μF, COUT = 22 μF, L = 1 μH TA = 25°C, bold values are
valid for –40°C TJ +125°C Unless otherwise indicated.
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
EN, /PG Control Pins
EN Threshold Voltage
VEN
1.5 —
——
EN Pin Current
—
— 1.5
Power-Good Threshold
(Rising)
V/PG-THR
— 0.90 ×
VOUT
Power-Good Threshold
(Falling)
V/PG-THF
— 0.83 ×
VOUT
Note 1: Specification for packaged product only.
2: Guaranteed by design and characterization.
—
0.4
3
—
—
Boost converter and chip logic
ON
V
Boost converter and chip logic
OFF
μA VIN = VEN = 3.6V
V—
V—
2015 Microchip Technology Inc.
DS20005549A-page 5
5 Page 
MIC2875
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
Pin Number
Fixed Output
Pin Number
Adj. Output
Pin Name
Description
1 1 SW Boost Converter Switch Node: Connect the inductor between
IN and SW pins.
2 2 PGND Power Ground: The power ground for the synchronous boost
DC/DC converter power stage.
3 3 IN Supply Input: Connect at least 1 μF ceramic capacitor between
IN and AGND pins.
4 4 AGND Analog Ground: The analog ground for the regulator control
loop.
5 — OUTS Output Voltage Sense Pin: For output voltage regulation in fixed
voltage version. Connect to the boost converter output.
— 5 FB Feedback Pin: For output voltage regulation in adjustable
version. Connect to the feedback resistor divider.
6 6 EN Boost Converter Enable: When this pin is driven low, the IC
enters shutdown mode. The EN pin has an internal 2.5 MΩ
pull-down resistor. The output is disabled when this pin is left
floating.
7 7 /PG Open Drain Power Good Output (Active Low): The /PG pin is
high impedance when the output voltage is below the power
good threshold and becomes low once the output is above the
power good threshold. The /PG pin has a typical RDS(ON) = 90Ω
and requires a pull up resistor of 1 MΩ. Connect /PG pin to
AGND when the /PG signal is not used.
8 8 OUT Boost Converter Output.
EP EP ePad Exposed Heat Sink Pad. Connect to AGND for best thermal
performance.
2015 Microchip Technology Inc.
DS20005549A-page 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MIC2875.PDF ] | |
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