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Part: S-8521A28MC-AXN-T2
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: Control Method = Pwm, Pwm/pfm ;; Operation Start Voltage = (Input 2.5 to 10/16 V) ;; Output Voltage = 1.5-6.0V ;; Output Accuracy = ±2.4% ;; Switching Frequency = 60, 180, 300 KHZ ;; Current Consumption Operating = 60 µA (180KHz) 21 µA (60KHz) 100 µA (300KHz) ;; Current Consumption Shutdown = 0.5 µA Max. ;; Efficiency Typ. = 93% ;; Package = SOT-23-5
Company: Seiko Instruments
Datasheet: Download S-8521A28MC-AXN-T2 datasheet File size : 4 kB
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Datasheet text preview:
Rev.7.4_10
PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
S-8520/8521 Series
The S-8520/8521 Series consists of CMOS step-down switching regulatorcontrollers with PWM-control (S-8520) and PWM/PFM-switched control (S8521). These devices contain a reference voltage source, oscillation circuit, error amplifier, and other components. The S-8520 Series provides low-ripple power, high-efficiency, and excellent transient characteristics thanks to a PWM control circuit capable of varying the duty ratio linearly from 0 % up to 100 %. The series also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. The S-8521 Series works with either PWM control or PFM control, and can switch from one to the other. It normally operates using PWM control with a duty ratio of 25 % to 100 %, but under a light load, it automatically switches to PFM control with a duty ratio of 25 %. This series ensures high efficiency over a wide range of conditions, from standby mode to operation of peripheral equipment.
W ith the addition of an external Pch Power MOS FET or PNP transistor, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOT-23-5 minipackage, providing such outstanding features as low current consumption. Since this series can accommodate an input voltage of up to 16 V, it is also ideal when operating via an AC adapter.
Features:
Applications:
ˇ On-board power supplies of battery devices for ˇ Low current consumption: portable telephones, electronic notebooks, PDAs, In operation: 60 ľA max. (A & B Series) and the like. 21 ľA max. (C & D Series) ˇ Power supplies for audio equipment, including 100 ľA max. (E & F Series) portable CD players and headphone stereo When powered off: 0.5 ľA max. equipment. ˇ Input voltage: ˇ Fixed voltage power supply for cameras, video 2.5 V to 16 V (B, D, F Series) equipment and communications equipment. 2.5 V to 10 V (A, C, E Series) ˇ Power supplies for microcomputers. ˇ Output voltage: ˇ Conversion from four NiH or NiCd cells or two Selectable between 1.5 V and lithium-ion cells to 3.3 V/3 V. 6.0 V in 0.1 V step ˇ Conversion of AC adapter input to 5 V/3 V. ˇ Duty ratio: 0 % to 100 % PWM control (S-8520) 25 % to 100 % PWM/PFM-switched control (S-8521) ˇ The only peripheral components that can be used with this IC are a Pch power MOS FET or PNP transistor, a coil, a diode, and capacitors (If a PNP transistor is used, a base resistance and a capacitor will also be required). ˇ Oscillation frequency: 180 kHz typ. (A & B Series), 60 kHz typ. (C & D Series), or 300 kHz typ. (E, F Series). ˇ Soft-start function: 8 ms. typ. (A & B Series) 12 ms. typ.(C & D Series), or 4.5 ms. typ. (E, F Series). ˇ With a power-off function. ˇ W ith a built-in overload protection circuit. Overload detection time: 4 ms. typ. (A Series), 14 ms. typ. (C Series) or 2.6 ms. typ.(E Series).
Seiko Instruments Inc.
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PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series Rev.7.4_10 Block Diagram:
Tr VIN
Oscillation Circuit
L
Reference Voltage Source with Soft Start
VOUT
EXT VIN CIN SD
PWM or PWM/PFMSwitched Control Circuit
+ COUT
VON / OFF ON / OFF
VSS
Note: The diode inside the IC is a parasitic diode.
Figure 1 Block Diagram
Selection Guide:
1. Product Name
S - 852 X X XX MC - XXX T2
. Tape specifications Product name abbreviation. Package name abbreviation. Output voltage x 10 Product type: A: Oscillation frequency of 180 kHz, with overload protection circuit.
B: Oscillati n frequency of 180 kHz, without overload protection circuit. o C: Oscillation frequency of 60 kHz, with overload protection circuit. D: Oscillation frequency of 60 kHz, without overload protection circuit. E: Oscillation frequency of 300 kHz, with overload protection circuit. F: Oscillation frequency of 300 kHz, without overload protection circuit.
Control system
0: PWM control 1: PWM/PFM-switched control
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Seiko Instruments Inc.
PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
2. Product List (As of September 1, 2000) A & B Series (Oscillation Frequency of 180 kHz)
Item Output Voltage (V) 1.6 1.8 1.9 2.0 2.1 2.5 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 5.0 S-8520AXXMC Series S-8520A21MC-AVG-T2 S-8520A25MC-AVK-T2 S-8520A27MC-AVM-T2 S-8520A28MC-AVN-T2 S-8520A29MC-AVO-T2 S-8520A30MC-AVP-T2 S-8520A31MC-AVQ-T2 S-8520A32MC-AVR-T2 S-8520A33MC-AVS-T2 S-8520A34MC-AVT-T2 S-8520A35MC-AVU-T2 S-8520A36MC-AVV-T2 S-8520A50MC-AWJ-T2 S-8521AXXMC Series S-8521A25MC-AXK-T2 S-8521A27MC-AXM-T2 S-8521A28MC-AXN-T2 S-8521A29MC-AXO-T2 S-8521A30MC-AXP-T2 S-8521A31MC-AXQ-T2 S-8521A32MC-AXR-T2 S-8521A33MC-AXS-T2 S-8521A34MC-AXT-T2 S-8521A35MC-AXU-T2 S-8521A36MC-AXV-T2 S-8521A50MC-AYJ-T2 S-8520BXXMC Series S-8521BXXMC Series
S-8520B18MC-ARD-T2 S-8521B18MC-ATD-T2 S-8521B19MC-ATE-T2 S-8521B20MC-ATF-T2 S-8521B21MC-ATG-T2 S-8520B25MC-ARK-T2 S-8521B25MC-ATK-T2 S-8520B27MC-ARM-T2 S-8521B27MC-ATM-T2 S-8520B28MC-ARN-T2 S-8521B28MC-ATN-T2 S-8520B29MC-ARO-T2 S-8521B29MC-ATO-T2 S-8520B30MC-ARP-T2 S-8521B30MC-ATP-T2 S-8520B31MC-ARQ-T2 S-8521B31MC-ATQ-T2 S-8520B32MC-ARR-T2 S-8521B32MC-ATR-T2 S-8520B33MC-ARS-T2 S-8521B33MC-ATS-T2 S-8520B34MC-ART-T2 S-8521B34MC-ATT-T2 S-8520B35MC-ARU-T2 S-8521B35MC-ATU-T2 S-8520B36MC-ARV-T2 S-8521B36MC-ATV-T2 S-8520B50MC-ASJ-T2 S-8521B50MC-AUJ-T2
C & D Series (Oscillation Frequency of 60 kHz)
Item Output Voltage (V) 1.6 2.0 2.5 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 5.0 S-8520CXXMC Series S-8520C25MC-BRK-T2 S-8520C27MC-BRM-T2 S-8520C28MC-BRN-T2 S-8520C29MC-BRO-T2 S-8520C30MC-BRP-T2 S-8520C31MC-BRQ-T2 S-8520C32MC-BRR-T2 S-8520C33MC-BRS-T2 S-8520C34MC-BRT-T2 S-8520C35MC-BRU-T2 S-8520C36MC-BRV-T2 S-8520C50MC-BSJ-T2 S-8521CXXMC Series S-8521C16MC-BTB-T2 S-8521C25MC-BTK-T2 S-8521C27MC-BTM-T2 S-8521C28MC-BTN-T2 S-8521C29MC-BTO-T2 S-8521C30MC-BTP-T2 S-8521C31MC-BTQ-T2 S-8521C32MC-BTR-T2 S-8521C33MC-BTS-T2 S-8521C34MC-BTT-T2 S-8521C35MC-BTU-T2 S-8521C36MC-BTV-T2 S-8521C50MC-BUJ-T2 S-8520DXXMC Series S-8520D25MC-BVK-T2 S-8520D27MC-BVM-T2 S-8520D28MC-BVN-T2 S-8520D29MC-BVO-T2 S-8520D30MC-BVP-T2 S-8520D31MC-BVQ-T2 S-8520D32MC-BVR-T2 S-8520D33MC-BVS-T2 S-8520D34MC-BVT-T2 S-8520D35MC-BVU-T2 S-8520D36MC-BVV-T2 S-8520D50MC-BWJ-T2 S-8521DXXMC Series S-8521D16MC-BXB-T2 S-8521D20MC-BXF-T2 S-8521D25MC-BXK-T2 S-8521D27MC-BXM-T2 S-8521D28MC-BXN-T2 S-8521D29MC-BXO-T2 S-8521D30MC-BXP-T2 S-8521D31MC-BXQ-T2 S-8521D32MC-BXR-T2 S-8521D33MC-BXS-T2 S-8521D34MC-BXT-T2 S-8521D35MC-BXU-T2 S-8521D36MC-BXV-T2 S-8521D50MC-BYJ-T2
E & F Series (Oscillation Frequency of 300 kHz)
Item Output Voltage (V) 1.5 1.8 2.0 2.5 2.7 3.0 3.3 3.4 3.5 5.0 S-8520EXXMC Series S-8520E18MC-BJD-T2 S-8520E25MC-BJK-T2 S-8520E30MC-BJP-T2 S-8520E33MC-BJS-T2 S-8520E50MC-BKJ-T2 S-8521EXXMC Series S-8521E15MC-BLA-T2 S-8521E18MC-BLD-T2 S-8521E20MC-BLF-T2 S-8521E30MC-BLP-T2 S-8521E33MC-BLS-T2 S-8521E35MC-BLU-T2 S-8521E50MC-BMJ-T2 S-8520FXXMC Series S-8520F18MC-BND-T2 S-8520F25MC-BNK-T2 S-8520F27MC-BNM-T2 S-8520F30MC-BNP-T2 S-8520F33MC-BNS-T2 S-8520F34MC-BNT-T2 S-8520F50MC-BOJ-T2 S-8521FXXMC Series S-8521F18MC-BPD-T2 S-8521F30MC-BPP-T2 S-8521F33MC-BPS-T2 S-8521F50MC-BQJ-T2
For the availability of product samples listed above, contact the SII Sales Department.
Seiko Instruments Inc.
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Others parts begin by s0
S0-1 S0-2 S0-3 S0-4 S0-5 S0-6 S0-7 S0-8 S0-9 S0-10 S0-11 S0-12 S0-13 S0-14 S0-15 S0-16 S0-17 S0-18 S0-19 S0-20 S0-21 S0-22 S0-23
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