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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 Lead Free package: SOP-8L SOP-8L: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1)
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 vary 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 supply 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
* * * * *
Ordering Information
AP 1605 S X - 13
Package S : SOP-8L Lead Free L : Lead Free G : Green
Packaging (Note 2) SOP-8L SOP-8L
Packing
13 : Tape & Reel
Device
Lead-free
AP1605SL-13 AP1605SG-13
Notes:
Package Code S S
13" Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 2500/Tape & Reel -13
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf.
AP1605 Rev. 2
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AP1605
PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR
Pin Assignments
( Top View )
FB CE Vcc PVcc 1 2 3 4 8 7 6 5 Vss Vss SW SW
SOP-8L
Pin Descriptions
Pin Name FB CE Vcc PVcc SW Vss Pin No. 1 2 3 4 5, 6 7, 8 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
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AP1605
PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR
Block Diagram
PV CC
SW
FB AP1605 VCC PWM /PFM -Switched Control Circuit + Oscillation Circuit Reference Voltage Source
CE
V SS
Absolute Maximum Ratings
Symbol VCC PVCC FB VCE VSW PD TOPR TSTG
Caution:
Parameter VCC Pin Voltage PVCC Pin Voltage FB Pin Voltage ON/OFF Pin Voltage Switch Pin Voltage Power Dissipation Operating Temperature Range Storage Temperature Range
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 -20 to +85 -20 to +125
Unit V V V V V mW
o o
C C
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.
AP1605 Rev. 2
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AP1605
PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR
Electrical Characteristics
Symbol VIN VREF VUVLO MAXDTY PFMDTY ISW ISS ISSS VOUT1 VOUT2 FOSC VCEH VCEL ISH ISL EFFI
(VIN = 5V, TA = 25C, unless otherwise specified)
Parameter Conditions Min. Input Voltage AP1605 Series 2.5 Internal Reference Voltage 1.1625 UVLO Voltage Voltage required to maintain VOUT -Maximum Duty Ratio 100 PFM Duty Ratio 15 Switch Current Current Consumption POWERON Current Consumption During Power Off Line Regulation Load Regulation Oscillation Frequency CE Pin "High" Voltage CE Pin "Low" Voltage Power-Off Pin Input Leakage Current Efficiency Duty = 50% VOUT = 2.5V VON/OFF = 0V 2.5V~7V @ IOUT = 0.1A 0.1A~3A Evaluate oscillation at SW pin Evaluate oscillation stop at SW pin --VIN = 5V, VOUT = 2.5V IOUT = 1A 3 ----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 V -% 35 % -100 2 0.5 1.5 380 -0.2 0.1 0.1 -A A A % % KHz *Vcc A A %
AP1605 Rev. 2
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AP1605
PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR
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
Vout = VFB x (1 +
RA RB
)
2
Application with Short Circuit Protection
VOUT : 1.8V PVCC DVCC
1N4148 for above 5V Vin and Schottky for below 5V Vin
VIN : 2.5V~7V SW CC FB RON/OFF 3.5M RBias 10M CPVCC CVCC 100 uF 0.1uF CON/OFF 0.2uF RA
AP 1605
VCC
+
CE RB V SS D1 =~10K
-
COUTPUT 100 uF
RSENCE 1M
Vout = VFB x (1 +
RA RB
)
AP1605 Rev. 2
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AP1605
PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR
Test Circuit
Functional 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.
AP1605 Rev. 2
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AP1605
PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR
Marking Information
(1) SOP-8L
( Top View )
8 5
Logo Part Number AP1605 YY WW X X
1 4
L : Lead Free G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code
Package Information
(1) Package Type: SOP-8L
( All Dimensions in mm )
3.85/3.95
5.90/6.10
0.10/0.20
0.254 0.62/0.82
Gauge Plane Seating Plane
Detail "A"
7~9 1.30/1.50 1.75max. 0.15/0.25
0.35max. 45
7~9
Detail "A"
0/8
1.27typ 4.85/4.95
0.3/0.5
8x-0.60 5.4 6x-1.27 8x-1.55
Land Pattern Recommendation (Unit: mm)
AP1605 Rev. 2
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AP1605
PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR
IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated.
AP1605 Rev. 2
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