Application Note: AN_SY7063
1.8V Minimum Input and 5. 5V Maximum Output 3A Peak Current Synchronous Boost with Output Disconnect
General Description
SY7063 is a high efficiency synchronous boost regulator that converts down to 1.8V input and up to 5.5V output voltage. It adopts NMOS for the main switch and PMOS for the synchronous switch. It can disconnect the output from input during the shutdown mode.
Absolute Maximum Ratings
Recommended Operating Conditions
AN_SY7063 Rev. 0.1
Silergy Corp. Confidential- Prepared for Customer Use Only
2
深圳昱灿电子
专业电源管理芯片 DCDC升压 降压 LDO 锂电池充电等 联系人：李先生
Figure 2. Efficiency Figure
AN_SY7063 Rev. 0.1
Silergy Corp. Confidential- Prepared for Internal Use Only
1深圳昱灿电子来自专业电源管理芯片 DCDC升压 降压 LDO 锂电池充电等 联系人：李先生
SY7063
Pinout (top view)
(QFN2x2-10)
Name PVOUT SVOUT LX PGND SGND IN EN LBI FB LBO
Top mark:UJxyz (Device code: UJ., x=year code, y=week code, z= lot number code) QFN2x2-10 Description 1 Power output pin. Decouple this pin to GND pin with at least 22uF ceramic cap. Signal output pin. Decouple this pin to GND pin with at least 1.0uF ceramic cap for noise 6 immunity consideration. 2 Inductor node. Connect an inductor between IN pin and LX pin. 3 Power ground pin. 4 Signal ground pin. 5 Signal input pin. 7 Enable pin. Internal integrated with 1Mohm pull down resistor. 8 Low battery comparator input. Feedback pin. Connect a resistor R1 between OUT and FB, and a resistor R2 between FB 10 and GND to program the output voltage. VOUT=1.2V*(R1/R2+1). 9 Low battery comparator output.(open drain) .
Ordering Information
SY7063 □(□□)□ Temperature Code Package Code Optional Spec Code Ordering Number SY7063QMC Package type QFN2x2-10 Note ----
Applications
SY7063
Electrical Characteristics
(VIN =2.4V, VOUT=5V, IOUT=500mA, TA = 25°C unless otherwise specified)
Parameter Input Voltage Output Voltage Range Quiescent Current VIN VOUT Shutdown Current Linear charge current Soft-start time Input Vin UVLO threshold Vin UVLO hysteresis EN Rising Threshold EN Falling Threshold LBI Voltage Threshold LBI Input Hysteresis Low Side Main FET RON Synchronous FET RON Main FET Current Limit Switching Frequency Feedback Reference Voltage Output over voltage protection Minimum on time Minimum off time Max on time Thermal Shutdown Temperature Thermal Shutdown hysteresis Output Discharge Resistor
Min 1.8 2.5
Typ
Max 5.25 5.5
Io=0A,VEN=VIN=1.8V, VOUT=5.0V VEN=0V, VIN=2.4V VOUT≤1V 1V<VOUT<90%VIN
10 27 0.1 1.5 1.2 1 0.1 1.2 1.176 1.2 20 36 40 500 1.2 6 100 100 2 150 20 80
Features
• • • • • • • • • •
1.8V Minimum input voltage Adjustable output voltage from 2.5V to 5. 5V 3A peak current limit Input under voltage lockout Load disconnect during shutdown Output over voltage protection Input battery voltage monitor Low RDS(ON) (main switch/synchronous switch) at 5.0V output: 36/40mohm Output auto-discharge function Compact package: QFN2x2-10
Symbol VIN VOUT IQ ISHDN ICHARGE Tss VUVLO VHYS VENH VENL VLBI VLBI_HYS RDS(ON)1 RDS(ON)2 ILIM1 fsw VREF VOVP TON_MIN TOFF_MIN TON_MAX TSD THYS RDSC
Test Conditions
•
All Single Cell Li or Dual Cell Battery Operated Products as MP-3 Player, PDAs, and Other Portable Equipment.
Typical Applications
Figure 1. Schematic Diagram
(Note 1) EN--------------------------------------------------------------------------------------------------------------------------VOUT+0.3V Other Pins-------------------------------------------------------------------------------------------------------------------------- 6V Power Dissipation, PD@ TA=25°C QFN2x2-10----------------------------------------------------------------------------2.5W Package Thermal Resistance (Note 2) θ JA ----------------------------------------------------------------------------------------------------------------50°C/W θ JC ----------------------------------------------------------------------------------------------------------------10°C/W Junction Temperature Range ---------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) ---------------------------------------------------------------------------------- 260°C Storage Temperature Range ------------------------------------------------------------------------------------ -65°C to 150°C (Note 3) IN --------------------------------------------------------------------------------------------------------------------- 1.8V to 5.25V PVOUT, SVOUT----------------------------------------------------------------------------------------------------- 2.5V to 5.5V EN ---------------------------------------------------------------------------------------------------------------- 0V to VOUT+0.3V All other pins ---------------------------------------------------------------------------------------------------------------- 0-5.5V Junction Temperature Range ------------------------------------------------------------------------------------ -40°C to 125°C Ambient Temperature Range ------------------------------------------------------------------------------------- -40°C to 85°C