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PDF MIC2876 Data sheet ( Hoja de datos )
| Número de pieza | MIC2876 | |
| Descripción | Synchronous Boost Regulator | |
| Fabricantes | Microchip | |
| Logotipo |  |
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MIC2876
4.8A ISW, Synchronous Boost Regulator
with Bi-Directional Load Disconnect
Features
• Up to 95% Efficiency
• Input Voltage Range from 2.5V to 5.5V
• Fully Integrated, High-Efficiency, 2 MHz
Synchronous Boost Regulator
• Bi-Directional True Load Disconnect
• Integrated Anti-Ringing Switch
• <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 UDFN package
Applications
• Tablets and Smartphones
• USB OTG and HDMI Hosts
• Portable Power Reserve Supplies
• High-Current Parallel Lithium Cell Applications
• Portable Equipment
General Description
The MIC2876 is a compact and highly efficient 2 MHz
synchronous boost regulator with a 4.8A switch. It
features a bi-directional load disconnect function that
prevents any leakage current between the input and
output when the device is disabled. The MIC2876
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.
The MIC2876 also features an integrated anti-ringing
switch to minimize EMI.
The MIC2876 is available in a 8-pin 2 mm × 2 mm
UDFN package, with a junction temperature range of
–40°C to +125°C.
Package Types
MIC2876 (FIXED OUTPUT)
8-Pin 2x2 UDFN* (MT)
(Top View)
MIC2876 (ADJ. OUTPUT)
8-Pin 2x2 UDFN* (MT)
(Top View)
SW 1 Ÿ
PGND 2
IN 3
AGND 4
EP
8 OUT
7 /PG
6 EN
5 OUTS
SW 1 Ÿ
PGND 2
IN 3
EP
AGND 4
* Includes Exposed Thermal Pad (EP), see Table 3-1.
8 OUT
7 /PG
6 EN
5 FB
2016 Microchip Technology Inc.
DS20005572A-page 1
1 page  
MIC2876
TABLE 1-1: ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: VIN = 3.6V, VOUT = 5V, CIN = 4.7 µF, COUT = 22 µF, L = 1 µH, TA = 25°C, unless noted.
Bold values are valid for –40°C ≤ TJ ≤ +125°C. (Note 1).
Parameters
Sym. Min. Typ. Max. Units
Conditions
Power Good Threshold (Falling)
V/PG-THF
—
Note 1: Specification for packaged product only.
2: Guaranteed by design and characterization.
0.83 x
VOUT
—
V
—
2016 Microchip Technology Inc.
DS20005572A-page 5
5 Page 
MIC2876
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.
2016 Microchip Technology Inc.
DS20005572A-page 11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet MIC2876.PDF ] | |
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