s-8337aaca-t8t1g Seiko Instruments Inc., s-8337aaca-t8t1g Datasheet
s-8337aaca-t8t1g
Related parts for s-8337aaca-t8t1g
s-8337aaca-t8t1g Summary of contents
Page 1
... Fixed to 88% typ. (S-8338 Series) 1.0 V±1.5% Detection voltage can be selected from between 1.5 V and 2 0.1 V steps. Hysteresis width can be selected from between 0.1 V and 0 0.1 V steps. Delay time can be set using an external capacitor. Soft-start time can be selected in three steps, 10 ms, 15 ms, and 20 ms. ...
Page 2
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Block Diagram L VIN EXT VSS 2 SD RDuty (S-8337) or ON/OFF (S-8338) UVLO Oscillator + Maximum duty circuit − PWM + comparator Error amplifier − Timer latch short-circuit protection circuit Reference voltage (1.0 V) soft-start circuit ...
Page 3
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.1 _00 Product Name Structure Product name S-833 xxxx G Package name (abbreviation) and packing specification. P8T1: 8-Pin SON(A), tape T8T1: 8-Pin TSSOP, tape Soft-start time setting UVLO setting A: 2 ...
Page 4
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Pin Configurations 8-Pin SON(A) Top view Figure 2 8-Pin TSSOP Top view Figure 3 4 Pin No. Symbol CSP 4 VIN 5 EXT 6 VSS 7 ROSC RDuty 8 ON/ OFF Pin No ...
Page 5
... Storage temperature *1. When mounted on board [Mounted board] (1) Board size : (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 800 ...
Page 6
... However, the maximum duty is in the range of typical values when an ideal resistor is externally connected, so actually the fluctuation of the IC (±5%) must be considered. *3. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external capacitor is unlimited when an ideal case is assumed. But, use C discharge time of the capacitor ...
Page 7
... MHz). However, the oscillation frequency is in the range of typical values when an ideal resistor is externally connected, so actually the fluctuation of the IC (±10%) must be considered. *2. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external capacitor is unlimited when an ideal case is assumed. But, use C discharge time of the capacitor ...
Page 8
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series External Parts When Measuring Electrical Characteristics Element Name Inductor Diode Output capacitor Transistor Oscillation frequency setting resistor Maximum duty ratio setting resistor Short-circuit protection delay time setting capacitor Output voltage setting resistor 1 ...
Page 9
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.1 _00 Measurement Circuits FB2 (ON/OFF) FB CSP A VIN CSP CIN Oscilloscope Figure CSP L SD VIN M 1 CIN Figure 6 Seiko Instruments Inc. S-8337/8338 Series ...
Page 10
... The raising of the output voltage is controlled by slowly raising the reference voltage of the error amplifier input from power on as shown in Figure 7. The soft-start function is realized by controlling the voltage of the FB pin so that it is the same potential as the reference voltage that is slowly raised. A Rail-to-Rail amplifier is adopted as the error amplifier, which means that the voltage is loop controlled so that it can be the same as the reference voltage ...
Page 11
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.1 _00 3.3 V Input voltage ( 9.2 V Output voltage 2 OUT 0 V 1.0 V Error amplifier 0.35 V reference voltage pin voltage 0 4.0 V EXT pin voltage (V ) EXT V→3 9 OUT ...
Page 12
... To reset the latch operation to protect the IC from short-circuiting, either lower V reset voltage or lower or lower the level of the shutdown pin to “L”. Note that the latch operation is not reset even if V falls below the UVLO voltage. ...
Page 13
... Error amplifier The error amplifier outputs the PWM control signal so that the voltage of the FB pin is held at a specific value (1 V). By connecting a resistor (RZ) and capacitor (CZ) to the output pin (CC pin) of the error amplifier in series, an optional loop gain can be set, enabling stabilized phase compensation. ...
Page 14
... ⎝ L During t , energy is stored in L and is not transmitted from V , the energy of the capacitor (C OUT goes to the lowest level after M1 is turned ON (t transmitted via the diode to C function indicating the maximum value (ripple voltage: V diode into V ...
Page 15
... When substituting equation (11) for equation (15 − OUT = V − Therefore to reduce the ripple voltage important that the capacitor connected to the output pin has a large capacity and a small ESR. + ⎛ ⎞ OFF PK OUT • + • ⎟ ⎜ R … ...
Page 16
... The loss the switching transistor decreases by increasing L and the efficiency becomes PK maximum at a certain L value. Further increasing L decrease the efficiency due to the loss of the DC resistance of the inductor the oscillation frequency is higher, a smaller L value can be chosen, making the inductor smaller. In the S-8337/8338 Series, the oscillation frequency can be varied within the range of 286 kHz to 1 ...
Page 17
... small R increases the output current, but the efficiency decreases. Actually, a pulsating b current flows and a voltage drop occurs due to the wiring capacitance. Determine the optimum value by experiment. A speed-up capacitor (C decreases the switching loss and improves the efficiency. Select C by observing the following equation. ...
Page 18
... If a MOS FET with a threshold that is near the UVLO detection voltage is used, a large current may flow, stopping the output voltage from rising and possibly generating heat in the worst case. ...
Page 19
... OSC With the S-8337 Series, the maximum duty ratio can be set in a range of 47% to 88. external resistor. Connect the resistor across the RDuty and VSS pins. Select the resistance by using the following equation and referring to Figure 13 . The maximum duty ratio fluctuates according to the oscillation frequency ...
Page 20
... OUT R FB2 Connect divider resistors RFB1 and RFB2 as close to the IC to minimize effects from of noise. If noise does have an effect, adjust the values of RFB1 and RFB2 so that R CFB connected in parallel with RFB1 is a capacitor for phase compensation. Select the optimum value of this capacitor at which the stable operation can be ensured from the values of the inductor and output capacitor ...
Page 21
... EXT 0.1 μF VSS L VIN EXT 0.1 μF Caution The above connection diagram and constant will not guarantee successful operation. Perform thorough evaluation using the actual application to set the constant. SD RDuty (S-8337) UVLO Oscillator + Maximum duty circuit − PWM + comparator Error amplifier Timer latch − ...
Page 22
... The performance of a switching regulator varies depending on the design of the PCB patterns, peripheral circuits, and external parts. Thoroughly test all settings with your device. • This IC builds in soft start function, starts reference voltage gradually, and it is controlled so that FB pin voltage and reference voltage become this potential. Therefore, keep in mind that it will maximum duty state according to the factor of IC exterior if FB pin voltage is held less than reference voltage ...
Page 23
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.1 _00 Characteristics (Typical Data) 1. Example of Major Temperature Characteristics (Ta = − ° vs SS1 IN 700 = 1133 kHz (R f OSC OSC 600 500 = 700 kHz (R f OSC OSC 400 I SS1 [μA] 300 = 286 kHz (R ...
Page 24
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series MaxDuty vs 100 MaxDuty = 88. MaxDuty = 77% (R MaxDuty OSC 50 [%] 40 MaxDuty = 47% (R OSC −40 − [° PRO 70 (CSP = 0.1 μF) t PRO 60.0 50.0 40.0 t PRO [ms] 30.0 20.0 10.0 0 −40 −20 ...
Page 25
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.1 _00 V vs 1.0 0.9 0.8 0.7 0 0.5 [V] 0.4 0.3 0.2 0.1 0 −40 − [° [μA] –0.1 −40 − [° 1.0 0.9 0.8 0.7 0 0.5 [V] 0.4 0.3 0.2 0 100 = 3 0 [μA] –0 100 Seiko Instruments Inc. ...
Page 26
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series 2. Example of Major Power Supply Dependence Characteristics ( ° vs. V SS1 1200 = 1133 kHz f OSC = 120 kΩ) (R 1000 OSC = 700 kHz f OSC = 200 kΩ) (R 800 OSC I SS1 600 [μA] 400 200 ...
Page 27
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.1 _00 t vs. V PRO 70 (CSP = 0.1 μF) t PRO 60.0 50.0 40.0 t PRO [ms] 30.0 20 vs. V CCL 100 CCL 50 [μ 1.0 0.9 0.8 0.7 0 0.5 [V] 0.4 0.3 0.2 0 ...
Page 28
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series 3. Example of External Parts Dependence Characteristics f vs OSC OSC 1600 1400 1200 1000 f OSC 800 [kHz] 600 400 200 0 0 100 200 300 R [kΩ] OSC MaxDuty vs Duty OSC ...
Page 29
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.1 _00 4. Examples of Transient Response Characteristics = 9 Powering ON (V OUT = 1133 kHz mA, t (1) f OSC OUT [V] 0 – time [ms] = 700 kHz mA, t (3) f OSC OUT ...
Page 30
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series 4. 2 Responses of shutdown pin (V = 1133 kHz mA, t (1) f OSC OUT 4 V ON/OFF 2 [V] 0 – time [ms] = 700 kHz mA, t (3) f OSC OUT 4 V ON/OFF 2 [V] 0 – time [ms] ...
Page 31
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.1 _00 = 9 Load fluctuations (V OUT = 1133 kHz 0.1 mA→100 mA (1) f OSC OUT I OUT 100 mA 0 OUT [0.2 V/div] –20 –10 0 time [ms] = 700 kHz 0.1 mA→100 mA (3) f OSC OUT I OUT 100 mA 0 OUT [0.2 V/div] – ...
Page 32
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series 4. 4 Input voltage fluctuations (V = 1133 kHz 2.7 V→3.7 V (1) f OSC IN 4.0 3 [V] 3.0 2.5 –20 –10 0 time [ms] = 700 kHz 2.7 V→3.7 V (3) f OSC IN 4.0 3 [V] 3.0 2.5 –20 –10 0 time [ms] = 286 kHz 2.7 V→3.7 V (5) f ...
Page 33
... Gate to source voltage GS *10 Drain current D Caution The values shown in the characteristics column of Table 8 above are based on the materials provided by each manufacturer. However, consider the characteristics of the original materials when using the above products. Table 8 Properties of External Parts Manufacture 4.7 μH, DCR TDK Corporation Height = 1 ...
Page 34
... MaxDuty = (3) f OSC vs. η (a) I OUT 100 η [%] 0.01 0 [mA] OUT 34 ) vs. efficiency (η) characteristics and (b) output current (I OUT = 620 Ω ) FB2 = 120 kΩ 180 kΩ) OSC Duty (b) I OUT 13.20 13.15 13.10 V OUT 13.05 [V] 13.00 12. 12.90 10 100 1000 = 200 kΩ ...
Page 35
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.1 _00 = 9 8.2 k Ω OUT FB1 = 1133 kHz, MaxDuty = (1) f OSC vs. η (a) I OUT 100 η [%] 0.01 0 [mA] OUT = 700 kHz, MaxDuty = (2) f OSC vs. η ...
Page 36
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series = 6 5.1 k Ω OUT FB1 = 1133 kHz, MaxDuty = (1) f OSC vs. η (a) I OUT 100 η [%] 0.01 0 [mA] OUT = 700 kHz, MaxDuty = (2) f OSC vs. η ...
Page 37
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.1 _00 3. Reference data (2) The data of output current ( 7.5 k Ω OUT FB1 = 1133 kHz, MaxDuty = (1) f OSC 100 [mV 0.01 0 [mA] OUT = 286 kHz, MaxDuty = ...
Page 38
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series = 6 5.1 k Ω OUT FB1 = 1133 kHz, MaxDuty = (1) f OSC 100 [mV 0.01 0 [mA] OUT = 286 kHz, MaxDuty = (3) f OSC 100 ...
Page 39
... S-8337AAHA-P8T1G S-8337AAHB-P8T1G S-8337AAHC-P8T1G S-8337AAIA-P8T1G S-8337AAIB-P8T1G S-8337AAIC-P8T1G S-8337ABAA-P8T1G S-8337ABAB-P8T1G S-8337ABAC-P8T1G S-8337ABBA-P8T1G S-8337ABBB-P8T1G S-8337ABBC-P8T1G S-8337ABCA-P8T1G S-8337ABCB-P8T1G S-8337ABCC-P8T1G S-8337ABDA-P8T1G S-8337ABDB-P8T1G S-8337ABDC-P8T1G S-8337ABEA-P8T1G S-8337ABEB-P8T1G (1) ~ (3) Product code (Refer to Product name vs. Product code ) (4) ~ (8) Lot number Product code (1) (2) ( S-8337ABEC-P8T1G S-8337ABFA-P8T1G S-8337ABFB-P8T1G O B ...
Page 40
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series (b) S-8338 Series Product name S-8338AAAA-P8T1G S-8338AAAB-P8T1G S-8338AAAC-P8T1G S-8338AABA-P8T1G S-8338AABB-P8T1G S-8338AABC-P8T1G S-8338AACA-P8T1G S-8338AACB-P8T1G S-8338AACC-P8T1G S-8338AADA-P8T1G S-8338AADB-P8T1G S-8338AADC-P8T1G S-8338AAEA-P8T1G S-8338AAEB-P8T1G S-8338AAEC-P8T1G S-8338AAFA-P8T1G S-8338AAFB-P8T1G S-8338AAFC-P8T1G S-8338AAGA-P8T1G S-8338AAGB-P8T1G S-8338AAGC-P8T1G S-8338AAHA-P8T1G S-8338AAHB-P8T1G S-8338AAHC-P8T1G S-8338AAIA-P8T1G S-8338AAIB-P8T1G S-8338AAIC-P8T1G ...
Page 41
... Top view 1 (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) 4 Product name vs. Function code (a) S-8337 Series Product name S-8337AAAA-T8T1G S-8337AAAB-T8T1G S-8337AAAC-T8T1G S-8337AABA-T8T1G S-8337AABB-T8T1G S-8337AABC-T8T1G S-8337AACA-T8T1G S-8337AACB-T8T1G S-8337AACC-T8T1G S-8337AADA-T8T1G S-8337AADB-T8T1G S-8337AADC-T8T1G S-8337AAEA-T8T1G S-8337AAEB-T8T1G S-8337AAEC-T8T1G S-8337AAFA-T8T1G S-8337AAFB-T8T1G S-8337AAFC-T8T1G S-8337AAGA-T8T1G S-8337AAGB-T8T1G S-8337AAGC-T8T1G S-8337AAHA-T8T1G S-8337AAHB-T8T1G ...
Page 42
... STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series (b) S-8338 Series Product name S-8338AAAA-T8T1G S-8338AAAB-T8T1G S-8338AAAC-T8T1G S-8338AABA-T8T1G S-8338AABB-T8T1G S-8338AABC-T8T1G S-8338AACA-T8T1G S-8338AACB-T8T1G S-8338AACC-T8T1G S-8338AADA-T8T1G S-8338AADB-T8T1G S-8338AADC-T8T1G S-8338AAEA-T8T1G S-8338AAEB-T8T1G S-8338AAEC-T8T1G S-8338AAFA-T8T1G S-8338AAFB-T8T1G S-8338AAFC-T8T1G S-8338AAGA-T8T1G S-8338AAGB-T8T1G S-8338AAGC-T8T1G S-8338AAHA-T8T1G S-8338AAHB-T8T1G S-8338AAHC-T8T1G S-8338AAIA-T8T1G S-8338AAIB-T8T1G S-8338AAIC-T8T1G ...
Page 43
...
Page 44
...
Page 45
...
Page 46
...
Page 47
...
Page 48
...
Page 49
... 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 ...