RT9594A RICHTEK [Richtek Technology Corporation], RT9594A Datasheet
RT9594A
Related parts for RT9594A
RT9594A Summary of contents
Page 1
... PCB layout. The RT9594A/B also integrate an IGBT driver for igniting photoflash tube. Only a few external components are required, which greatly reduces the PCB space and cost. The RT9594A/B are available in the WQFN-16L 3x3 package. Ordering Information RT9594A/B ...
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... VDOUT CHARGE 27k Figure 1. Typical Application Circuit ) between SW pin and PGND to reduce the spike voltage BAT C2 47uF 1 15 VDD DRVIN R4 RT9594A/B VDRV 100k 10 DRVOUT STAT 5 VDOUT CHARGE 27k V OUT GSD2004S R1 150k C OUT R2 100uF/ ...
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... Charge Status Output. Open Drain output. When target output voltage is reached, N-MOSFET turns on. This pin needs a pull up resistor. Feedback Voltage Pin. Power Input Pin. N-MOSFET Switching Node. Power Ground. The exposed pad must be soldered to a large PCB and connected to PGND for maximum power dissipation. RT9594A/B VBAT PGND Ipeak ...
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... DD A Parameter RT9594A V Operating Voltage DD RT9594B Battery Voltage Switch-Off Current (I ) VDD Shutdown Current (I ) VDD FB Voltage RT9594A Line Regulation RT9594B STAT Open Drain R DS(ON) Charge Enable High Charge Enable Low www.richtek.com 4 (Note 1) (Note 4) Symbol Test Conditions BAT ...
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... Note 4. The device is not guaranteed to function outside its operating conditions. DS9594A/B-02 April 2011 Symbol Test Conditions 10mA DS(ON VDRV V = 3.3V VDRV V = 3.3V VDRV V FBVD Falling FBVD V FBVD_HYS = 25° low effective thermal conductivity test board (single layer, A RT9594A/B Min Typ Max -- 300 400 -- 250 350 -- 400 -- 2 -- 5.5 0.8 1.5 2 ...
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... RT9594A/B Typical Operating Characteristics Charge Time vs PK-PRI 1.6A PK-PRI Output Voltage vs. V 308 306 304 T = 25°C A 302 300 T = 85° -40°C A 298 296 1.5 2.5 3.5 Switching V SW (20V/Div) I PRI (1A/Div) I SEC (200mA/Div) Time (1μs/Div) www ...
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... Application Information The RT9594A/B integrate a constant peak current controller for charging photoflash capacitor and an IGBT driver for igniting flash tube. The photoflash capacitor charger uses constant primary peak current and SW falling control to efficiently charge the photoflash capacitor. Pulling the CHARGE pin high will initiate the charging cycle ...
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... RT9594A/B will be turned on (VDOUT state become GND), the peak current value will be determined by R4. When battery voltage is <2.5V, the VDOUT open drain MOS inside the RT9594A/B will be turned off (VDOUT state become OPEN), then the peak current is determined by R4 series with R5. Thus charging current is decreasing as shown in Figure 7 ...
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... Figure 7. Lower Charging Current Layout Guide For best performance, careful PCB layout is necessary. The following guidelines should be strictly followed when designing a PCB layout for the RT9594A/B. 1. Both of primary and secondary power paths should be as short as possible. 2. Place the R as close to chip as possible. The GND ...
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... RT9594A/B 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 Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time ...