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AP1605
PWM/PFM Dual-mode Step-Down Switching Regulator
Features
- Low current consumption: In operation: 100A max. Power off: 2A 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.
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.
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 Assignments
FB CE 1 2 AP1605 6 SW 5 SW 8 Vss 7 Vss
Pin Descriptions
Pin Pin No. Name SOP TSSOP
FB CE 1 2 4 23
Description
Feedback pin Chip Enable: H: Enable L: Disable IC signal power supply pin, add a 10 resistor to PVcc and a 0.1F 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
Vcc 3 PVcc 4
Vcc PVcc
3 4 56 78
5 67 8 1
SOP-8L
Vss CE CE FB 1 2 3 4 AP1605 8 7 6 5 SW PVcc PVcc Vcc
SW Vss
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 Lead Free Packing
Blank : Tube S: SOP-8L Blank : Normal TS: TSSOP-8L L : Lead Free Package A : Taping
Block Diagram
PV CC SW
FB AP1605 VCC PWM /PFM -Switched Control Circuit + Oscillation Circuit Reference Voltage Source V SS
CE
Absolute Maximum Ratings
Symbol VCC*1 PVCC FB VCE VSW PD TOPR VCC Pin Voltage PVCC Pin Voltage FB Pin Voltage ON/OFF Pin Voltage Switch Pin Voltage Power Dissipation Operating Temperature Range SOP-8L TSSOP-8L Parameter Rating VSS - 0.3 to VSS + 8 VSS - 0.3 to VSS + 8 VSS - 0.3 to VSS + 8 VSS - 0.3 to VSS + 8 VSS - 0.3 to VIN + 0.3 1200 700 -20 to +85 Unit V V V V V mW
o o
C
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 2/6
Rev. 1.1 Jan 18, 2005
AP1605
PWM/PFM Dual-mode Step-Down Switching Regulator
Electrical Characteristics (VIN = 5V, Ta=25C, 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 -100 15 3 1.5 ----220 0.65 --0.1 -0.1 -Typ. -1.2 --25 --35 -0.2 1 300 ----93 Max. Unit 7 V 1.2375 V 2.2 -35 --100 2 0.5 1.5 380 -0.2 0.1 0.1 -V % % A A A % % KHz *Vcc A A %
Typical Application Circuit
1 Normal Application
OUT PV CC SW CC RVCC FB VCC CVCC RCE 100K CE V SS RA
AP1605
D1
+
RB =~200K
-
CCE 0.1uF
Vo = Vref x (1 +
RA RB
)
Anachip Corp. www.anachip.com.tw 3/6
Rev. 1.1 Jan 18, 2005
AP1605
PWM/PFM Dual-mode Step-Down Switching Regulator
Typical Application Circuit (Continued)
2 Application with Short Circuit Protection
VOUT : 1.8V PV CC DVCC
1N4148 for above 5V Vin and Schottky for below 5V Vin
VIN : 2.5V~7V SW CC FB RA
AP 1605
VCC CON/OFF 0.2uF
RON/OFF 3.5M RBias 10M CPVCC CVCC 100 uF 0.1uF
+
CE V SS RB D1 =~10K
-
COUTPUT 100 uF
RSENCE 1M
Vo = Vref x (1 +
RA RB
)
Test Circuit
Vcc PVcc
A
SW
FB
open
Oscillation
open
A +
Vcc PVcc CE
SW
FB
CE
Vss
-
Vss
Vcc
+ -
SW
FB
+ V
PVcc CE 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 4/6
Rev. 1.1 Jan 18, 2005
AP1605
PWM/PFM Dual-mode Step-Down Switching Regulator
Marking Information
( Top View )
8 5
Logo
AP1605 YY WW X X
1
4
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
Package Type: SOP-8L
E
H
L VIEW "A" D 7 (4X) A2 A 0.015x45
7 (4X)
A1
e
B y
C
VIEW "A"
Symbol A A1 A2 B C D E e H L y
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 -
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 -
Anachip Corp. www.anachip.com.tw 5/6
Rev. 1.1 Jan 18, 2005
AP1605
PWM/PFM Dual-mode Step-Down Switching Regulator
Package Information (Continued)
Package Type: TSSOP-8L
E1 PIN 1 INDICATOR 0.70 mm SURFACE POLISHED
E
L L1
DETAIL A D
e A2
E1
L1
A1
y
Symbol A A1 A2 b C D E E1 e L L1 y
Dimensions In Millimeters Min. Nom. Max. 1.05 0.05 0.20 2.90 6.20 4.30 0.50 0.90 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
Dimensions In Inches Min. Nom. Max. 0.041 0.002 0.008 0.114 0.244 0.169 0.02 0.035 0O 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
Anachip Corp. www.anachip.com.tw 6/6
C
b
A
DETAIL A
Rev. 1.1 Jan 18, 2005

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