AP1605 ANACHIP | Alldatasheet
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PWM/PFM Dual-mode Step-Down Switching Regulator This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev. 1.1 Jan 18, 2005 Features - Low current consumption: In operation: 100µA max. Power off: 2µA max. - Input voltage: 2.5V to 7V. Adjustable version (+2.5%) - PWM/PFM dual Mode - Oscillation frequency: 300KHz (Typ.) - With a power-off function. - Built-in internal SW P-channel MOS - SOP-8L/TSSOP-8L Package. Applications - On-board power supplies of battery devices for portable telephones, electronic notebooks, PDA, and other hand-held sets. - Power supplies for audio equipment, including portable CD players and headphone stereo equipment. - Fixed voltage power supply for cameras, video equipment and communications equipment. - Power supplies for microcomputers. - Conversion from four Ni-H or Ni-Cd cells or two lithium-ion cells to 3.3V/3V. - Conversion of AC adapter input to 5V/3V. General Description AP1605 consists of CMOS step-down switching regulator with PWM/PFM dual mode control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP1605 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM/PFM control circuit is able to very the duty ratio linearly 0%~0.25% (PFM) and 25%~100% (PWM). With the addition of an internal P-channel Power MOS, 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 SOP–8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage of up to 7V, it is also ideal when operating via an AC adapter. Pin Assignments FB SWVcc AP1605 SW Vss Vss PVcc CE SOP-8L Vss CE CE FB SW PVcc PVcc Vcc AP1605 TSSOP-8L Pin Descriptions Pin No. Pin Name SOP TSSOP Description FB 1 4 Feedback pin CE 2 2、3 Chip Enable: H: Enable L: Disable Vcc 3 5 IC signal power supply pin, add a 10 Ω resistor to PVcc and a 0.1µF capacitor to GND. PVcc 4 6、7 IC power supply pin SW 5、6 8 Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI. Vss 7、8 1 GND Pin
PWM/PFM Dual-mode Step-Down Switching Regulator Anachip Corp. Ordering Information AP 1605 X X X Package Packing S: SOP-8L Blank : Tube A : Taping Lead Free Blank : Normal L : Lead Free PackageTS: TSSOP-8L Block Diagram Oscillation Circuit Reference Voltage Source PWM/PFM -Switched Control Circuit AP1605 VSS FB PVCC SW VCC CE Absolute Maximum Ratings Symbol Parameter Rating Unit VCC *1 VCC Pin Voltage V SS - 0.3 to VSS + 8 V PVCC PV CC Pin Voltage V SS - 0.3 to VSS + 8 V FB FB Pin Voltage V SS - 0.3 to VSS + 8 V VCE ON/OFF Pin Voltage V SS - 0.3 to VSS + 8 V VSW Switch Pin Voltage V SS - 0.3 to VIN + 0.3 V SOP-8L 1200 PD Power Dissipation TSSOP-8L 700 mW TOPR Operating Temperature Range -20 to +85 oC TSTG Storage Temperature Range -20 to +125 oC 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.
PWM/PFM Dual-mode Step-Down Switching Regulator Anachip Corp. Electrical Characteristics (VIN = 5V, Ta=25°C, unless otherwise specified) Symbol Parameter Conditions Min. Typ. Max. Unit VIN Input Voltage AP1605 Series 2.5 -- 7 V VREF Internal Reference Voltage 1.1625 1.2 1.2375 V VUVLO UVLO Voltage Voltage required to maintain VOUT -- -- 2.2 V MAXDTY Maximum Duty Ratio 100 -- -- % PFMDTY PFM Duty Ratio 15 25 35 % SOP-8L 3 -- -- ISW Switch Current Duty = 50% TSSOP-8L 1.5 -- -- A ISS Current Consumption POWERON VOUT=2.5V -- 35 100 µA ISSS Current Consumption During Power Off VON/OFF =0V -- -- 2 µA ∆VOUT1 Line Regulation 2.5V~7V @ I OUT=0.1A -- 0.2 0.5 % ∆VOUT2 Load Regulation 0.1A~3A(SOP-8L), 0.1A~1.5A(TSSOP-8L) -- 1 1.5 % FOSC Oscillation Frequency 220 300 380 KHz VCEH CE Pin “High” Voltage Evaluate oscillation at SW pin 0.65 -- -- VCEL CE Pin “Low” Voltage Evaluate oscillation stop at SW pin -- -- 0.2 *Vcc ISL Power-Off Pin Input Leakage Current -- -0.1 -- 0.1 µA EFFI Efficiency V IN = 5V, VOUT = 2.5V IOUT = 1A -- 93 -- % Typical Application Circuit （1） Normal Application CC RA RB OUT VSS FB PVCC SW VCC RVCC CVCC AP1605 =~200K CE RCE CCE R R (1VrefVo B A +×= 100K 0.1uF
PWM/PFM Dual-mode Step-Down Switching Regulator Anachip Corp. Typical Application Circuit (Continued) （2） Application with Short Circuit Protection AP 1605 -VSS CE CC RA RB VOUT : 1.8V FB PVCC SW VCC DVCC 1N4148 for above 5V Vin and Schottky for below 5V Vin CVCC 0.1uF CPVCC 100uF CON/OFF 0.2uF RON/OFF 3.5M RBias 10M RSENCE COUTPUT 100uF VIN : 2.5V~7V R R (1VrefVo B A +×= =~10K Test Circuit A FBVcc Vss open open FBVcc Vss Oscillation SW SW PVcc PVcc A FBVcc Vss V SW PVcc CE CE CE Function Description PWM/PFM Control (AP1605 Series) The AP1605 consists of DC/DC converters that employ a PWM/PFM auto-switch system. In converters of the AP1605, the PFM mode varies in a range of duty cycle from 0% to 25%, and the PWM mode varies in a range of duty cycle from 25% to 100% according to the load current, and yet ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current.
PWM/PFM Dual-mode Step-Down Switching Regulator Anachip Corp. Marking Information SOP-8L/TSSOP-8L ( Top View ) Logo Part no. ID code: internal Year: "01" =2001 "02" =2002 Xth week: 01~52 ~1 4 8 5 AP1605 YY WW X X Blank : normal L : Lead Free Package Package Information Package Type: SOP-8L VIEW "A" L C VIEW "A" H E A A2A1Be D 7 (4X) 0.015x45 7 (4X) y A1 0.10 − 0.25 0.040 − 0.100 θ 0O − 8O 0O − 8O
PWM/PFM Dual-mode Step-Down Switching Regulator Anachip Corp. Package Information (Continued) Package Type: TSSOP-8L A E b y e C DETAIL A DETAIL A L 1 L E1 L1 D PIN 1 INDICATOR ψ0.70 mm SURFACE POLISHED A2 - 1.00 1.05 - 0.039 0.041 θ 0O 4 O 8 O 0 O 4 O 8 O