RT9202BGS RICHTEK [Richtek Technology Corporation], RT9202BGS Datasheet
RT9202BGS
Related parts for RT9202BGS
RT9202BGS Summary of contents
Page 1
Single Synchronous Buck PWM DC-DC Controller General Description The RT9202B is a single power supply PWM DC-DC converter controller designed to drive N-MOSFET in a synchronous buck topology. The IC integrates the control, output adjustment, monitoring and protection functions in ...
Page 2
RT9202B Typical Application Circuit Q1 SHND 2N7002 H : shutdown Q1 SHND 2N7002 H : shutdown www.richtek.com 20K PHASE BOOT 0.1uF 7 2 OCSET UGATE V OUT 2. GND 5 ...
Page 3
GND C VCC 1uF VCC Function Block Diagram VCC Bias 0.8 Reference 0.8V Error FB GND DS9202B-03 March 2007 C OUT 1000uF L 5uH C BOOT BOOT 0.1uF RT9202B Layout Placement Layout Notes 1. Put CIN1 & CIN2 to be ...
Page 4
RT9202B Functional Pin Description BOOT (Pin 1) This pin provides ground referenced bias voltage to the upper MOSFET driver. A bootstrap circuit is used to create a voltage suitable to drive a logic-level N-Channel MOSFET when operating at a single ...
Page 5
Absolute Maximum Ratings Supply Input Voltage, V ----------------------------------------------------------------------------------------- BOOT & UGATE to GND -------------------------------------------------------------------------------------------- 15V l Input, Output or I/O Voltage ---------------------------------------------------------------------------------------- GND 0. Power Dissipation ...
Page 6
RT9202B Parameter Protection FB Over-Voltage Trip FB Under-Voltage Trip OCSET Current Source Soft-Start Interval Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the ...
Page 7
Typical Operating Characteristic Dead Time UGATE Time (50ns/Div) Power 2.2V OUT Time (2.5ms/Div) Load Transient UGATE V OUT Time (5us/Div) DS9202B-03 March 2007 LGATE OUT V ...
Page 8
RT9202B Bootstrap Wave Form UGATE LGATE PHASE Time (1us/Div) Reference vs. Temperature 0.803 0.802 0.801 0.800 0.799 0.798 0.797 0.796 -50 0 Temperature POR (Rising/Falling) vs. Temperature 4.3 Rising 4.2 4.1 4.0 3.9 3.8 Falling 3.7 3.6 -50 0 Temperature ...
Page 9
Application Information The RT9202B operates at either single 5V power supply with a bootstrap UGATE driver or 5V/12V dual-power supply form the ATX SMPS. The dual- power supply is recommended for high current application, the RT9202B can deliver higher gate ...
Page 10
RT9202B Both V and V are referenced to V SET DS capacitor across R helps V OCSET variations of V due to MOSFET switching. The over- IN current function will be tripped at a peak inductor current (I ) determined ...
Page 11
Table 1 V OUT Inductor 2 H 1000 F (ESR=53m ) 100mV 1500 F (ESR=33m ) 62mV 3000 F (ESR=21m ) 40mV *Refer to Sanyo low ESR series (CE, DX, PX.....) The suggested L and C are as follows: 2 ...
Page 12
RT9202B V = 3.3V OUT C = 1500 F(33m ) OUT 1. 2.9kHz OUT 2.5V OUT Z = 3.2kHz 3.3V 30 OUT 20 Loop Gain ...
Page 13
There are two sets of critical components in a DC-DC converter using the RT9202B. The switching power components are most critical because they switch large amounts of energy, and as such, they tend to generate equally large amounts of noise. ...
Page 14
RT9202B Outline Dimension Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 www.richtek.com ...