S-8460B00AFT-TBG Seiko Instruments, S-8460B00AFT-TBG Datasheet
S-8460B00AFT-TBG
Specifications of S-8460B00AFT-TBG
Related parts for S-8460B00AFT-TBG
S-8460B00AFT-TBG Summary of contents
Page 1
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER Features • Single-coil, step-up or step-down switching realizes high efficiency. • High efficiency is realized by using only N-channel power MOS FET as an external power MOS • Synchronous rectification at step-down operation • Input voltage : • Variable output voltage : • ...
Page 2
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8460 Block Diagram SW1 C BST V C SW2 IN IN SD2 C VL Remark Diodes shown in the IC are parasitic diodes. Product Code • Product code : S-8460B00AFT-TB-G • Delivery form : Taping only 2 L BST VIN S-8460 Oscillation ...
Page 3
... BST Boost capacitor connection pin for SW1 driving *1. No use except boosting this IC is allowed. *2. The VSS pin and DVSS pin are internally short-circuited. *3. The NC pin is electrically open. Connection of this pin to VIN or VSS is allowed. Seiko Instruments Inc. S-8460 Table 1 Pin Description ...
Page 4
... Board size : 114.3 mm × 76.2 mm × t1.6 mm (2) Board name : JEDEC STANDARD51-7 Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. (1) When mounted on board ...
Page 5
... PRO measured 200 to 600 OUT = 2. 400 OUT CDRH104R (22 μH) MA2Q737 (Schottky) RB411D (Schottky) F93 ( μF, tantalum) × 4 FDN337N × 3 Seiko Instruments Inc mA, output voltage is set to 3 25°C) OUT Min. Typ. Max. Unit 3.234 3.3 3.366 V 3.234 3.3 3.366 V − 2.2 18.0 V − ...
Page 6
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8460 Measurement Circuits 1. 47 μF A 0.1 μF 2. FDN337N F93 F93 47 μF 47 μF 0.1 μF FDN337N 6 VIN VL 4.7 μF A ON/OFF LX T CSS CPRO VSS DVSS 4700 pF 2200 pF Figure 4 CDRH104R 22 μH ON/OFF VIN BST EXT1 ...
Page 7
... The S-8460 automatically selects step-up operation or step-down operation to hold the output voltage constant according to the input voltage (V can be constructed using the S-8460, since the S-8460 works as a switching regulator for both step-up and step- down operation. Figure 6 shows the block diagram of the S-8460. ...
Page 8
... SW1 : OFF, SW2 : ON for approximately 200 ns just after SW3 is turned off, and the BST pin is then bootstrapped to V SW2 is turned on after SW1 is turned off and SW1 is turned on after SW2 is turned off to avoid the large current to flow between V and V ...
Page 9
... V Figure 10 shows the turning point between step-up operation and step-down schematically for the case when the output voltage is 3 the area where the two slant lines are crossing and noted by “Step-up or down” the S- 8460 shows step-up operation or step-down operation. ...
Page 10
... V is thus possible when the S-8460 is in halt state. OUT The ON/OFF pin is configured as shown in Figure 12 and is not either pulled up or pulled down. So, do not use it with floating state. When the ON/OFF pin is not used, connect it to the VIN pin. 10 ...
Page 11
... If the overload state is eliminated, the S-8460 goes back to the normal operation determined by the external capacitor (C PRO the maximum duty operation to the instant at which pin voltage of the EXT1 to EXT3 is held “L” to protect switching transistors, is expressed by the following equation. External Parts Selection 1. Inductor ...
Page 12
... The main circuits of the IC work on an internal power source connected to the VL pin. C for stabilizing the internal power source. C low impedance. 4. External Transistors Enhancement N-channel MOS FETs should be used for the external transistors. SW1 is driven by the bootstrapped voltage bipolar transistor is used for SW1, SW1 is not turned on since the charge in the capacitor ( − ...
Page 13
... If the external MOS FETs have much different characteristics (input capacitance, threshold value, etc.) among them, they turn on at the same time to let a through current flow and reduce efficiency MOS FET with a large input capacitance is used, switching dissipation increases and efficiency decreases. If such a MOS FET is used at several hundreds more, the dissipation at the MOS FET increases and may exceed the power dissipation of the MOS FET ...
Page 14
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8460 5. Output Voltage Adjustment The output voltage is externally set in the S-8460. The output voltage can be set and adjusted in the output voltage setting range (2 adding external resistors (R Temperature gradient can be added by inserting a thermistor in series to R The output voltage is set as (R exceed 2 MΩ ...
Page 15
... If the VOUT pin is short-circuited to VSS, the protection circuit starts to operate before the integral protection time t passes. • When the temperature is high and the load μA, the voltage of the EXT1 to EXT3 pins is held “L” and the output voltage V increases. ...
Page 16
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8460 Characteristics (Typical Data) 1. Examples of Major Characteristics (1) Current Consumption 2 (I SS2 140 120 Ta = −40°C 100 25° (3) Current Consumption at Shutdown (I Input Voltage ( 3.0 2.5 2.0 25° −40°C 1.5 1.0 0.5 0 (5) ON/OFF Pin Input Voltage “H” (V ...
Page 17
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.2.1 _00 (9) EXT1 Pin Output Current “H” (I Input Voltage ( 100 Ta = −40° 25° ( (11) EXT2 Pin Output Current “H” (I Input Voltage ( 100 Ta = −40° 25° (V) IN (13) EXT3 Pin Output Current “H” (I ...
Page 18
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8460 2. Examples of Transient Response Characteristics : 0 V → (1) Power- V/div OUT (1 V/div ms/div V/div OUT (1 V/div ms/div) (2) ON/OFF Pin Response (V ON/OFF ON/OFF (1 V/div OUT (1 V/div ms/div ON/OFF (1 V /div V/div /div load, V OUT : 0 V → ...
Page 19
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.2.1 _00 : 10 μA → 100 mA, 100 mA → 10 μA, V (3) Load Fluctuations (I OUT : 10 μ A → 100 OUT 100 mA I OUT 10 μ OUT (0.1 V/div) t (0.5 ms/div μA → 100 OUT 100 mA I OUT 10 μA ...
Page 20
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8460 (4) Input Voltage Fluctuation (V : 2.7 V → 5 (1.0 V/div OUT (0.1 V/div) t (0.5 ms/div) : 2.2 V → 18 (4.0 V/div OUT (0.1 V/div) t (0.5 ms/div 2.7 V → 5.0 V, 5.0 V → 2.7 V, 2.2 V → 18.0 V → 2 100 mA OUT (1 ...
Page 21
... Reference Data Reference data are intended for use in selecting peripheral parts to the IC. The information therefore provides characteristic data in which external parts are selected with a view of wide variety of IC applications. All data shows typical value. 1. External Parts for Reference Data Table 4 External Parts List for Output Current vs. Efficiency, Input Voltage vs. Efficiency, Output Current vs ...
Page 22
... LX CPH6401 EXT2 RB411D VL 4.7 μF Remark Values for and C FB1 FB2 External Parts List for Ripple Data Table 5 External Parts for Input Voltage vs. Ripple Voltage Characteristics Data Output No. Product Name Voltage (31) S-8460B00AFT 3.3 V (32) (33) (34) 2.5 V (35) 5 230 kΩ ...
Page 23
... FTS2001 Si2302DS Vishay Siliconix FDN335N Caution The value of each characteristic in Table 6 depends on the materials prepared by each manufacturer, however, confirm the specifications by referring to respective materials when using any of the above. Remark Super SOT registered trademark or a trademark of Fairchild Semiconductor Corporation. Table 6 Performance of External Parts Manufacturer 47 μ ...
Page 24
... I (mA) OUT = 3.3 V) (7) S-8460B00AFT (V OUT CPH6401, MA2Q737, CDRH104R/10 μH CPH6401,MA2Q737,CDRH104R/10 μ H 100 =2. (mA) OUT 24 vs. efficiency (η) characteristics when the S-8460 is used under OUT (2) S-8460B00AFT (V 100 =2.7V 3.0V 60 3.3V 50 100 1000 1 (4) S-8460B00AFT (V 100 4. 3. 100 1000 1 (6) S-8460B00AFT (V 100 4 ...
Page 25
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.2.1 _00 = 2.5 V) (9) S-8460B00AFT (V OUT CPH6401,MA2Q737,CDRH104R/22 μ H CPH6401, MA2Q737, CDRH104R/22 μH 100 3.75V =2. 2. (mA) OUT = 2.5 V) (11) S-8460B00AFT (V OUT CPH6401, MA2Q737, CDRH104R/10 μH CPH6401,MA2Q737,CDRH104R/10 μ H 100 3.75V =2. 2. (mA) OUT = 5.0 V) (13) S-8460B00AFT (V OUT CPH6401, MA2Q737, CDRH104R/22 μ ...
Page 26
... Si2302DS,D1FH3,CDRH104R/22 μ H 100 90 80 66mA ( 3.3 V) (23) S-8460B00AFT (V OUT CPH6401, MA2Q737, CDRH104R/10 μH CPH6401,MA2Q737,CDRH104R/10 μ H 100 66mA ( vs. efficiency (η) characteristics when the S-8460 is used under IN (18) S-8460B00AFT (V 100 200mA 66mA (20) S-8460B00AFT (V 100 200m 100mA =50mA OUT 66mA (22) S-8460B00AFT (V 100 200m 100mA ...
Page 27
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.2.1 _00 4. Output Current (I ) vs. Output Voltage (V OUT The following shows the actual output current (I under conditions (25) to (27) in Table 3.3 V) (25) S-8460B00AFT(V OUT CPH6401, MA2Q737, CDRH104R/22 μH CPH6401,MA2Q737,CDRH104R/22 μ H 3.45 3. 3.35 3.30 3 ...
Page 28
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8460 5. Input Voltage (V ) vs. Output Voltage (V IN The following shows the actual input voltage (V under conditions (28) to (30) in Table 3.3 V) (28) S-8460B00AFT (V OUT CPH6401, MA2Q737, CDRH104R/22 μH CPH6401,MA2Q737,CDRH104R/22 μ H 3.35 3.33 I =0.1m A OUT 3 ...
Page 29
... STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.2.1 _00 6. Input Voltage (V ) vs. Ripple Voltage (V IN The following shows the actual input voltage (V conditions (31) to (35) in Table 3.3 V) (31) S-8460B00AFT (V OUT CPH6401, MA2Q737, CDRH104R/22 μ 200 ( 3.3 V) (33) S-8460B00AFT (V OUT CPH6401, MA2Q737, CDRH104R/47 μH ...
Page 30
...
Page 31
...
Page 32
...
Page 33
... Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Seiko Instruments Inc. is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc ...