AP1605 PWM/PFM Dual-mode Step-Down Switching Regulator Features General Description - 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. 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. 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. Pin Descriptions Pin Assignments FB 1 8 Vss CE 2 7 Vss Pin Pin No. Name SOP TSSOP AP1605 Vcc 3 6 SW PVcc 4 5 SW FB 1 4 CE 2 2、3 Vcc 3 5 PVcc 4 6、7 SW 5、6 8 Vss 7、8 1 SOP-8L Vss 1 8 SW CE 2 7 PVcc CE 3 6 PVcc FB 4 5 Vcc AP1605 Description Feedback pin Chip Enable: H: Enable L: Disable IC signal power supply pin, add a 10Ω resistor to PVcc and a 0.1µF capacitor to GND. IC power supply pin Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI. GND Pin TSSOP-8L 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 1/6 AP1605 PWM/PFM Dual-mode Step-Down Switching Regulator Ordering Information AP 1605 X X X Package Packing Lead Free Blank : Tube S: SOP-8L Blank : Normal TS: TSSOP-8L L : Lead Free Package A : Taping Block Diagram SW PV CC FB AP1605 V CC PWM /PFM -Switched Control Circuit + - CE Oscillation Circuit Reference Voltage Source V SS Absolute Maximum Ratings Symbol Rating Unit VCC Pin Voltage VSS - 0.3 to VSS + 8 V PVCC Pin Voltage VSS - 0.3 to VSS + 8 V FB FB Pin Voltage VSS - 0.3 to VSS + 8 V VCE ON/OFF Pin Voltage VSS - 0.3 to VSS + 8 V VSW Switch Pin Voltage VSS - 0.3 to VIN + 0.3 1200 700 -20 to +85 V VCC*1 PVCC PD TOPR Parameter Power Dissipation SOP-8L TSSOP-8L Operating Temperature Range mW o C o TSTG Storage Temperature Range -20 to +125 C 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. Anachip Corp. www.anachip.com.tw Rev. 1.1 Jan 18, 2005 2/6 AP1605 PWM/PFM Dual-mode Step-Down Switching Regulator Electrical Characteristics (VIN = 5V, Ta=25°C, unless otherwise specified) Symbol Parameter Conditions VIN Input Voltage AP1605 Series VREF Internal Reference Voltage Voltage required to maintain VUVLO UVLO Voltage VOUT MAXDTY Maximum Duty Ratio PFMDTY PFM Duty Ratio SOP-8L ISW Switch Current Duty = 50% TSSOP-8L Current Consumption ISS VOUT=2.5V POWERON Current Consumption VON/OFF =0V ISSS During Power Off ∆VOUT1 Line Regulation 2.5V~7V @ IOUT=0.1A 0.1A~3A(SOP-8L), ∆VOUT2 Load Regulation 0.1A~1.5A(TSSOP-8L) FOSC Oscillation Frequency VCEH CE Pin “High” Voltage Evaluate oscillation at SW pin Evaluate oscillation stop at SW VCEL CE Pin “Low” Voltage pin ISH -Power-Off Pin Input Leakage Current ISL -EFFI Efficiency VIN = 5V, VOUT = 2.5V IOUT = 1A Min. 2.5 1.1625 Typ. -1.2 Max. Unit 7 V 1.2375 V -- -- 2.2 V 100 15 3 1.5 -25 --- -35 --- % % -- 35 100 µA -- -- 2 µA -- 0.2 0.5 % -- 1 1.5 % 220 0.65 300 -- 380 -- KHz -- -- 0.2 -0.1 -0.1 -- --93 0.1 0.1 -- A *Vcc µA µA % Typical Application Circuit （1） Normal Application OUT PV CC SW CC RA R VCC FB V CC + AP1605 D1 C VCC RB =~200K - RCE 100K CE V SS CCE 0.1uF Vo = Vref × (1 + Anachip Corp. www.anachip.com.tw RA ) RB Rev. 1.1 Jan 18, 2005 3/6 AP1605 PWM/PFM Dual-mode Step-Down Switching Regulator Typical Application Circuit (Continued) （2） Application with Short Circuit Protection V IN : 2.5V~7V V OUT : 1.8V PV CC SW D VCC 1N4148 for above 5V Vin and Schottky for below 5V Vin R ON /OFF 3.5M C ON /OFF 0.2uF R Bias 10M CC AP 1605 V CC FB + CE RB V SS D1 R SENCE 1M C PVCC C VCC 100 uF 0.1uF RA - =~10K C OUTPUT 100 uF Vo = Vref × (1 + RA ) RB Test Circuit Vcc PVcc SW FB Oscillation open open A Vcc PVcc SW FB + A CE Vcc + - SW PVcc CE - Vss CE Vss FB + V Vss - 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. Anachip Corp. www.anachip.com.tw Rev. 1.1 Jan 18, 2005 4/6 AP1605 PWM/PFM Dual-mode Step-Down Switching Regulator Marking Information ( Top View ) 8 5 Logo AP1605 YY WW X X 4 ~ 1 Part no. Blank : normal L : Lead Free Package ID code: internal Xth week: 01~52 Year: "01" =2001 "02" =2002 SOP-8L/TSSOP-8L Package Information H E Package Type: SOP-8L L VIEW "A" D 0.015x45 7 (4X) e B A1 C A A2 7 (4X) VIEW "A" y Symbol A A1 A2 B C D E e H L y θ Dimensions In Millimeters Min. Nom. Max. 1.40 1.60 1.75 0.10 0.25 − 1.30 1.45 1.50 0.33 0.41 0.51 0.19 0.20 0.25 4.80 5.05 5.30 3.70 3.90 4.10 1.27 − − 5.79 5.99 6.20 0.38 0.71 1.27 0.10 − − 8O 0O − Anachip Corp. www.anachip.com.tw Dimensions In Inches Min. Nom. Max. 0.055 0.063 0.069 0.040 0.100 − 0.051 0.057 0.059 0.013 0.016 0.020 0.0075 0.008 0.010 0.189 0.199 0.209 0.146 0.154 0.162 0.050 − − 0.228 0.236 0.244 0.015 0.028 0.050 0.004 − − 0O 8O − Rev. 1.1 Jan 18, 2005 5/6 AP1605 PWM/PFM Dual-mode Step-Down Switching Regulator Package Information (Continued) E E1 Package Type: TSSOP-8L PIN 1 INDICATOR ψ0.70 mm SURFACE POLISHED L L1 DETAIL A D e A A1 A2 b C D E E1 e L L1 y θ DETAIL A C A1 b y Symbol L1 A A2 E1 Dimensions In Millimeters Min. Nom. Max. Dimensions In Inches Min. Nom. Max. 1.05 0.05 0.20 2.90 6.20 4.30 0.50 0.90 0O 0.041 0.002 0.008 0.114 0.244 0.169 0.02 0.035 0O 1.10 0.10 1.00 0.25 0.13 3.05 6.40 4.40 0.65 0.60 1.00 4O 1.20 0.15 1.05 0.28 3.10 6.60 4.50 0.70 1.10 0.10 8O Anachip Corp. www.anachip.com.tw 0.043 0.004 0.039 0.01 0.005 0.12 0.252 0.173 0.026 0.024 0.039 4O 0.047 0.006 0.041 0.011 0.122 0.26 0.177 0.028 0.043 0.004 8O Rev. 1.1 Jan 18, 2005 6/6