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PDF SYR828 Data sheet ( Hoja de datos )
| Número de pieza | SYR828 | |
| Descripción | Synchronous Step Down Regulator | |
| Fabricantes | Silergy | |
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Hay una vista previa y un enlace de descarga de SYR828 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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SYR828
High Efficiency 5.5V, 6A, 2.4MHz
I2C Programmable, Synchronous Step Down Regulator
Preliminary Specification
General Description
SYR828 is a high efficiency 2.4MHz synchronous step
down DC/DC regulator IC capable of delivering up to 6A
output currents. It can operate over a wide input voltage
range from 2.6V to 5.5V and integrate main switch and
synchronous switch with very low RDS (ON) to minimize the
conduction loss. The output voltage can be programmed
from 0.7125V to 1.5V through I2C interface.
SYR828 is in a space saving, low profile CSP1.56*1.96-20
package.
Ordering Information
SYR827 □(□□)□
Temperature Code
Package Code
Optional Spec Code
Ordering Number Package Type Slave Address
SYR828PKC CSP1.56*1.96-20
0x41H
Features
• Input voltage range: 2.6V to 5.5V
• 2.4 MHz switching frequency minimizes the external
components
• Typical 65uA quiescent current
• Low RDS(ON) for internal switches (PFET/NFET):
28mΩ/17mΩ
• Programmable Output Voltage: 0.7125V to 1.5V in
12.5mV steps
• 6A continuous output current capability.
• Capable for 0.25uH inductor and 22uF Ceramic
Capacitor.
• Hic-cup mode protection for hard short condition
• RoHS Compliant and Halogen Free
• Compact package: CSP1.56*1.96-20
Applications
• Smart-phone
• Web-tablets
Typical Applications
Figure 1. Schematic Diagram
SYR828 Rev.0.1 Silergy Corp. Confidential-Prepared for Customer Use Only
1
1 page  
SYR828
Enabling Function
The EN pin controls SYR828 start up. EN pin low to high transition starts the power up sequence. If EN pin is low,
the DC/DC converter will be turned off.
SYR828 allows software to enable of the regulator when EN is HIGH, via the BUCK_EN bits. BUCK_EN0 and
BUCK_EN1 are both initialized HIGH in the registers.
Hardware and Software Enable control table.
Pins
EN VSEL
0x
10
10
11
11
BUCK_EN0
x
0
1
x
x
Bits
BUCK_EN1
x
x
x
0
1
OUTPUT
OFF
OFF
ON
OFF
ON
Input Over Voltage Protection Function
When the VIN exceeds over voltage protection threshold, SYR828 will stop switching to protect the circuitry. An
internal 20us blanking time helps to prevent the circuit from shutting down due to noise spikes.
I2C Interface
SYR828 features an I2C interface that allow the HOST processor to control the output voltage achieve the DVS
function. The I2C interface supports clock speeds of up to 3.4MHz and uses standard I2C commands. SYR828
always operates as a slave device, and is addressed using a 7-bit slave address followed by an 8th bit, which indicates
whether the transaction is a read-operation or a write-operation. I2C address of the SYR828 is set at the factory to
0x41h.
START and STOP Conditions:
SYR828 is controlled via an I2C compatible interface. The START condition is a HIGH to LOW transition of the
SDA line while SCL is HIGH. The STOP condition is a LOW to HIGH transition on the SDA line while SCL is
HIGH. A STOP condition must be sent before each START condition. The I2C master always generates the START
and STOP conditions.
Data Validity:
The data on the SDA line must be stable during the HIGH period of the SCL, unless generating a START or STOP
condition. The HIGH or LOW state of the data line can only change when the clock signal on the SCL line is LOW.
SYR828 Rev. 0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SYR828.PDF ] | |
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