RT9602

RT9602 RICHTEK | Alldatasheet

Document overview

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Technical content

Features

z Drives Four N-Channel MOSFETs z Adaptive Shoot-Through Protection z Internal Bootstrap Devices z Small 14-Lead SOIC Package z 5V to 12V Gate-Drive Voltages for Optimal Efficiency z Tri-State Input for Bridge Shutdown z Supply Under-Voltage Protection z Power ON Over-Voltage Protection

Applications

z Core Voltage Supplies for Intel Pentium  4 and AMD AthlonTM Microprocessors z High Frequency Low Profile DC-DC Converters z High Current Low Voltage DC-DC Converters Pin Configurations Part Number Pin Configurations RT9602CS (Plastic SOP-14) TOP VIEW Operating temperature range C: Commercial standard Package type S : SOP-14 PWM1 PWM2 GND LGATE1 PVCC PGND LGATE2 VCC PHASE1 UGATE1 BOOT1 BOOT2 UGATE2 PHASE2

www.richtek-ic.com.tw DS9602-00 January 2002 Pin Description Pin No. Pin Name Pin Function

1 PWM1 Channel 1 PWM Input

2 PWM2 Channel 2 PWM Input

3 GND Ground Pin

4 LGATE1 Lower Gate Drive of Channel 1

5 PVCC Upper and Lower Gate Driver Power Rail

6 PGND Lower Gate Driver Ground Pin

7 LGATE2 Lower Gate Drive of Channel 2

Connect this pin to phase point of channel 2. Phase point is the connection point of high side MOSFET source and low side MOSFET drain

9 UGATE2 Upper Gate Drive of Channel 2

10 BOOT2 Floating Bootstrap Supply Pin of Channel 2

11 BOOT1 Floating Bootstrap Supply Pin of Channel 1

12 UGATE1 Upper Gate Drive of Channel 1

13 PHASE1 Connect this pin to phase point of channel 1. Phase point is the connection point of high side MOSFET source and low side MOSFET drain

14 VCC Control Logic Power Supply

DS9602-00 January 2002 www.richtek-ic.com.tw Function Block Diagram Shoot-through Protection Power-on OVP Shoot-through Protection Shoot-through Protection Power-on OVP Shoot-through Protection Control Logic PVCC BOOT1 UGATE1 PHASE1 LGATE1 PGND VCC BOOT2 UGATE2 PHASE2 LGATE2 PVCC PGND PGND Internal 19K 19K PWM1 PWM2 GND Internal 19K 19K PVCC PVCC

www.richtek-ic.com.tw DS9602-00 January 2002 Absolute Maximum Ratings z Supply Voltage (VCC) 15V z Supply Voltage (PVCC) VCC + 0.3V z BOOT Voltage (VBOOT-VPHASE) 15V z Input Voltage (VPWM) GND–0.3V to 7V z UGATE VPHASE-0.3V to VBOOT+0.3V z LGATE GND-0.3V to VPVCC+0.3V z Package Thermal Resistance SOP-14, θJA 160°C /W z Ambient Temperature 0 °C ~ 70°C z Junction Temperature 0 °C ~ 125°C z Storage Temperature Range -40 °C ~ 150°C z Lead Temperature (Soldering, 10 sec.) 260 °C z ESD Level HBM 2KV MM 200V

Electrical Characteristics

Parameter Symbol Test Conditions Min Typ Max Units VCC Supply Current Bias Supply Current IVCC fPWM = 250KHz, V PVCC = 12V, Cboot = 0.1µF, Rphase = 20Ω -- 3 -- mA Power Supply Current IPVCC fPWM = 250kHz, VPVCC = 12V, Cboot = 0.1µF, Rphase = 20Ω -- 8 -- mA Power-On Reset VCC Rising Threshold 9.1 9.6 10 V VCC Falling Threshold 7.5 8.1 8.5 V PWM Input Maximum Input Current VPWM = 0 or 5V -- 200 -- µA PWM Floating Voltage Vcc=12V -- 1.9 -- V PWM Rising Threshold -- 3.7 -- V PWM Falling Threshold -- 1.1 -- V UGATE Rise Time VPVCC = VVCC = 12V, 3nF load -- 30 -- ns LGATE Rise Time VPVCC = VVCC = 12V, 3nF load -- 30 -- ns UGATE Fall Time VPVCC = VVCC = 12V, 3nF load -- 40 -- ns LGATE Fall Time VPVCC = VVCC = 12V, 3nF load -- 30 -- ns UGATE Turn-Off Propagation Delay VVCC = VPVCC = 12V, 3nF load -- 60 -- ns LGATE Turn-Off Propagation Delay VVCC = VPVCC = 12V, 3nF load -- 45 -- ns Shutdown Window 1.1 -- 3.7 V To be continued

DS9602-00 January 2002 www.richtek-ic.com.tw Parameter Symbol Test Conditions Min Typ Max Units Output Upper Drive Source RUGATE VVCC = 12V, VPVCC = 12V -- 1.5 -- Ω Upper Drive Sink RUGATE VVCC = 12V, VPVCC = 12V -- 1.45 2 Ω Lower Drive Source RLGATE VVCC = 12V, VPVCC = 12V -- 1.6 -- Ω Lower Drive Sink RLGATE VVCC = VPVCC = 12V -- 0.75 1 Ω Operation Descriptions The RT9602 has power on protection function which held UGATE and LGATE low before V CC up across the rising threshold voltage. After the initialization, the PWM signal takes the control. The rising PWM signal first forces the LGATE signal turns low then UGATE signal is allowed to go high just after a non- overlapping time to avoid shoot-through current. The falling of PWM signal first forces UGATE to go low. When UGATE and PHASE signal reach a predetermined low level, LGATE signal is allowed to turn high. The non-overlapping function is also presented between UGATE and LGATE signal transient. The PWM signal is recognized as high if above rising threshold and as low if below falling threshold. Any signal level in this window is considered as tri-state, which causes turn-off of both high side and low-side MOSFET. When PWM input is floating (not connected), internal divider will pull the PWM to 1.9V to give the controller a recognizable level. The maximum sink/source capability of internal PWM reference is 60µA. The PVCC pin provides flexibility of both high side and low side MOSFET gate drive voltages. If 8V, for example, is applied to PVCC, then high side MOSFET gate drive is 8V-1.5V(approximately, internal diode plus series resistance voltage drop). The low side gate drive voltage is exactly 8V. The RT9602 implements a power on over-voltage protection function. If the PHASE voltage exceeds 1.5V at power on, the LGATE would be turn on to pull the PHASE low until the PHASE voltage goes below 1.5V. Such function can protect the CPU from damage by some short condition happened before power on, which is sometimes encountered in the M/B manufacturing line.

www.richtek-ic.com.tw DS9602-00 January 2002 Typical Application Circuit VID4 VID3 VID2 VID1 VID0 COMP FB ADJ DVD SS ISN2 ISP2 ISN1 PWM2 PWM1 ISP1 PGOOD VDD RT9241 PGOOD +5V 1µF1000µF PHB83N03LT 12V VID4 VID3 VID2 VID1 VID0 0.1µF 18K 2.4K 2.4K 15K 66pF 1µF 10K 1.2µH BOOT1 UGATE1 PHASE1 LGATE1 UGATE2 PHASE2 LGATE2 BOOT2 PGND GND PWM1 PWM2 PVCC VCC 14VSEN 13GND 12V12V 10Ω 1µF 2µH PHB95N03LT ×1500µF 1000µF 1µF 2µH ×1500µF 1µF RT9602 +5V VCORE PHB83N03LT PHB95N03LT 1µF

DS9602-00 January 2002 www.richtek-ic.com.tw

Package Information

Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 8.534 8.738 0.336 0.344 B 3.810 3.988 0.150 0.157 C 1.346 1.753 0.053 0.069 D 0.330 0.508 0.013 0.020 F 1.194 1.346 0.047 0.053 H 0.178 0.254 0.007 0.010 I 0.102 0.254 0.004 0.010 J 5.791 6.198 0.228 0.244 M 0.406 1.270 0.016 0.050 14–Lead SOP Plastic Package B M H B J A C I F D

www.richtek-ic.com.tw DS9602-00 January 2002 RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw