CMOS IC For Switching Power Supply Control FA3630V FA3630V ■ Description ■ Dimensions, mm FA3630V is a DC-DC converter controller. This IC can directly drive a Nch/Pch-MOSFET. This IC is suitable to reduce converter size because it has many functions in a small package TSSOP. Á TSSOP-16 9 16 0.2±0.05 0.5±0.08 1.1max 0~8˚ 5.2 2 0.17+0.0 –0.04 8 1 0.07±0.05 • Low input voltage: 2.5V to 6.5V • 2-channels PWM control: Rail-to-rail output Output impedance of output stage = 3.5Ω (typ.) Nch-MOSFET driving (Ch1) Nch/Pch-MOSFET driving (Ch2)(selected by SEL pin) • Low power consumption: 0.7mA (typ.) • ON/OFFcontrol: Standby current= 0.1µA (typ.) • ±2% high accuracy reference voltage • Adjustable soft start time and maximum duty cycle • Adjustable built-in timer latch for short circuit protection • Wide range of operation frequency: 100kHz to 1MHz • Package: TSSOP-16 (Thin and small) 4.4 6.4±0.1 ■ Features 0.65 ■ Applications • Power supply for general equipment ■ Block diagram Pin No. Pin symbol Description 1 ON/OFF ON/OFF function 2 IN2+ Ch. 2 non-inverting input to error amplifier 3 IN2– Ch.2 inverting input to error amplifier 4 Ch. 2 output of error amplifier 5 FB2 SEL 6 GND Ground 7 CS2 OUT2 Soft start for Ch. 2 OUT1 CS1 VCC Ch.1 outout (for Nch-MOSFET) Regulated voltage output 14 VREG FB1 IN1– 15 CP Timing capacitor for timer latch delay 16 CT Oscillator timing capacitor 8 9 10 11 12 13 1 Selection of type of MOSFET drived Ch. 2 output (for Nch or PchMOSFET) Soft start for Ch.1 Power supply Ch.1 output of error amplifier Ch.1 inverting input to error amplifier FA3630V ■ Absolute maximum ratings Item Symbol VCC Source peak current of OUT1/2 IOUT+ Sink peak current of OUT1/2 IOUT– Input voltage for logic input VLOG Power supply voltage Output current of VREG Total power dissipation* Junction temperature Ambient temperature Storage temperature IREGMAX Pd TJ TOP Tstg ■ Recommended operating conditions Rating Unit Item Symbol Min. Max. Unit 6.5 V Power supply voltage 2.5 5.5 V –500 mA Input voltage for logic input 0 5.5 V 500 mA Oscillation frequency VCC VLOG fOSC 100 1000 kHz –0.3 to +6.5 V –10 mA 300 mW 125 °C –20 to +85 °C –40 to +125 °C * Ta ⬉ 25°C ■ Electrical characteristics (VCC=3.3V, Ta=25°C, CT=100pF) Regulated voltage section for internal control blocks Item Symbol Test condition Min. Typ. Max. Unit Regulated voltage VREG IREG=no load 2.156 2.200 2.244 V Variation with output current VRGOUT VRGLIN VRGTa VREG=0 to 5mV VCC=2.5 to 5.5V Variation with supply voltage Variation with temperature 5 mV 8 mV Ta=–20 to +25°C ±0.5 % Ta=+25 to +85°C ±0.5 % Reference voltage section Item Symbol Reference voltage VREF VRGLIN VRGTa Variation with supply voltage Variation with temperature Test condition Min. Typ. Max. Unit 0.98 1.00 1.02 V VCC=2.5 to 5.5V 1 5 mV Ta=–20 to +25°C ±0.5 % Ta=+25 to +85°C ±0.5 % Oscillator section Item Symbol Test condition Min. Oscillation frequency fOSC CT=100pF 437 High level voltage VOSCH VOSCL fdV fdT CT=100pF CT=100pF VCC=2.5 to 5.5V 1.39 Ta=–20 to +25°C ±5 % Ta=+25 to +85°C ±5 % Low level voltage Variation with supply voltage Variation with temperature Typ. Max. 485 533 kHz V 0.77 ±1 Unit V ±5 % Error amplifier section Item Symbol Input offset voltage Output sink current VIOF VICOM AVOL fT IFBL VFB=0.5V 2.0 2.5 3.0 mA Output source current IFBH VFB=VREG–0.5V –160 –125 –90 µA Common mode input voltage DC open loop gain Unity gain band width Test condition Min. Typ. Max. Unit 3 10 mV 1.5 V 0.2 70 75 dB 1.6 MHz 2 FA3630V ON/OFF logic input signal section Item Symbol Test condition Min. Input range for ON mode VONH VONL VCC=2.5V to 5.5V VCC=2.5V to 5.5V 2.0 Item Symbol Test condition Input range for driving Nch-MOSFET VSELH VSELL Input range for OFF mode Typ. Max. Unit V 0.5 V SEL logic input signal section Input range for driving Pch-MOSFET Min. Typ. Max. Vcc–0.5 Unit V 0.5 V Timer latch protection section Item Symbol Threshold voltage of CP Charge current of CP VCPTH ICP Threshold voltage of FB1/FB2 VFBTL Test condition VCP=VREG–0.5V Min. Typ. Max. Unit 1.55 1.70 1.85 V –2.5 –2.1 –1.7 µA 1.56 1.73 1.90 V Soft-start section Item Symbol Test condition Min. Typ. Max. Unit Threshold voltage of CS1/2 VCS 0 VCS 100 Duty cycle=0% 0.74 0.79 0.84 V Duty cycle=100% 1.29 1.34 1.39 V Symbol Test condition Min. Typ. Max. Unit RON IOUT =±100mA VCC=3.3V CLOAD=1000pF 3.5 7 Ω VCC=3.3V CLOAD=1000pF VCC=3.3V Threshold voltage of CS1/2 Output section Item ON resistance OUT1 ( High / Low ) OUT2 ( High / Low ) Rise time OUT1 tr OUT2 Fall time OUT1 tf OUT2 3.5 7 Ω 25 35 ns 25 35 ns 25 35 ns 25 35 ns Overall device Item Symbol Test condition Typ. Max. Unit Standby current ICC0 ON/OFF=GND Min. 0.1 5 µA Operating average current ICC OUT1, OUT2: Open 0.7 1 mA Output duty=100% (Reference value) OUT1, OUT2: Open IN– and FB: Shorted 3 1.5 mA FA3630V ■ Characteristic curves (Ta=25°C) Supply current (ICC) vs. supply voltage (VCC) Oscillation frequency (fOSC) vs. timing capactior(CT) 1.1 10000 1 0.9 0.7 fosc [kHZ] ICC [mA] 0.8 0.6 0.5 1000 0.4 100 0.3 0.2 0.1 0 0 1 2 3 4 5 10 10 6 100 100 90 90 80 80 70 60 50 40 30 70 60 50 40 30 20 20 10 10 0 0.5 0 1000 Output duty cycle vs. CS terminal voltage (VCS) Output duty cycle [%] Output duty cycle [%] Output duty cycle vs. FB terminal voltage (VFB) 0 500 100 CT [pF] VCC [V] 1 1.5 2 0.5 0 1 1.5 2 VCS [V] VFB [V] Oscillation frequency (fOSC ) vs. ambient temperature (Ta) Reference voltage (VREF) vs. ambient temperature (Ta) 500 1.01 Vcc=3.3V CT=100pF 490 VREF [V] fOSC [kHZ] 1.005 480 470 1 460 0.995 450 440 – 30 – 10 10 30 Ta [°C] 50 70 90 0.99 – 30 – 10 10 30 50 70 90 Ta[°C] 4 FA3630V H-level output voltage (VOH1) vs. output source current (ISOURCE1) 2.4 2.4 2.2 2.2 2 2 1.8 1.8 1.6 1.6 VCC– VOH1 [V] VOL1 [V] L-level output voltage (VOL1) vs. output sink current (Isink1) 1.4 VCC=3.3V 1.2 1 1.4 VCC=3.3V 1.2 1 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0 0 50 100 150 200 250 0 300 0 50 ISINK 1 [mA] 2.2 2 2 1.8 1.8 1.6 1.6 VCC– VOH2 [V] VOL2 [V] 2.4 2.2 1.4 VCC=3.3V 1.2 1 0.4 0.4 0.2 0.2 200 250 300 Condition: Open loop 180 160 140 120 100 Phase 80 60 40 Voltage gain 20 0 – 20 – 40 100 1K 10K 100K ƒ [HZ] 0 0 50 100 150 200 ISOURCE 2 [mA] Error amplifier voltage gain (Av) / phase (θ) vs. frequency (f) Av [dB] [deg] 1 0.6 ISINK 2 [mA] 5 VCC=3.3V 0.8 150 300 1.2 0.6 100 250 1.4 0.8 50 200 H-level output voltage (VOH2) vs. output source current (ISOURCE2) 2.4 0 150 ISOURCE 1 [mA] L-level output voltage (VOL2) vs. output sink current (Isink2) 0 100 1M 10M 250 300 FA3630V ■ Application circuit Parts tolerances characteristics are not defined in the circuit design sample shown above. When designing an actual circuit for a product, you must determine parts tolerances and characteristics for safe and economical operation. 6