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AP1635
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER
Features
* * * * * * * * Input voltage range: 2.2V~5V (VOUT type) Oscillator frequency: 700KHz (Typ.) Internal reference: 1.0V (Typ.) High efficiency: 93% (Typ.) Current limit and thermal shutdown protection Lead Free Package: SOP-8L SOP-8L: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1)
General Description
The AP1635 series are multi-functional step-down DC/DC converters with built-in speed, low ON resistance drivers. It is capable to deliver more than 1.2A output current with external coil, diode and capacitor. Output voltage is set-up by the external resistors. (2.5% accuracy). The 700KHz AP1635 that can work out with small value external components comes out more compact board. The device switches to and works under PFM mode with light loads. It keeps at high efficiency for both light loads and large output current. AP1635 can be soft-start with a proper capacitor connected between CE/SS pin and ground. The stand-by current is less than 6uA when CE/SS pin is at "LOW" status. The device is forced to switch off as the voltage at that pin is lower than the stipulated voltage.
Applications
* * * * * Electronic Information Organizers Palmtops Cellular and portable phones Portable Audio Systems Various Multi-function Power Supplies
Ordering Information
AP 1635 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
AP1635SL-13 AP1635SG-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.
AP1635 Rev. 4
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(c) Diodes Incorporated
AP1635
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER
Pin Assignments
( Top View )
FB CE/SS SVcc PVcc 1 2 3 4 8 7 6 5 GND GND SW SW
SOP-8L
Pin Descriptions
Pin Name
FB CE/SS SVcc PVcc SW GND
Pin No.
1 2 3 4 5/6 7/8
Description
Feedback pin Chip Enable/ Soft Start: H: Enable L: Disable IC signal power supply pin, add a 20 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
AP1635 Rev. 4
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(c) Diodes Incorporated
AP1635
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER
Block Diagram
SVcc
FB
Phase Compensation
PVcc Current Limit
+ ERR AMP Soft Start
+
SW
-
PWM Comparator
CE/SS
Vref with CE
PWM/PFM Controller
Ramp Wave Generator, OSC
GND
Absolute Maximum Ratings
Symbol VCC/SVCC VSW VFB VCE/SS PD TOPR TSTG Parameter
(TA=25C)
Ratings -0.3 ~ 5.0 -0.3 ~ VIN+0.3 -0.3 ~ VIN+0.3 -0.3 ~ VIN+0.3 Internal limited -25 ~ +80 -40 ~ +125
Units V V V V C C
VIN Pin Voltage SW Pin Voltage FB Pin Voltage CE/SS Pin Voltage Continuous Total Power Dissipation Operating Ambient Temperature Storage Temperature
AP1635 Rev. 4
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(c) Diodes Incorporated
AP1635
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER
Electrical Characteristics
VIN=5V, VOUT2V, Load=300mA, TA=25C Symbol Parameter VFB FB VIN Input Voltage Line Regulation Load Regulation UVLO Voltagemin. VUVLO operating voltage ICC Operating Current ICCQ ISTB ICL Supply Current Stand-by Current Current Limit Conditions Min 0.975 2.2 1200 500 85 15 1.4 Typ. 1.0 100 90 6 1400 700 90 25 93 350 Max 1.025 5 0.12 1.2 2 150 120 1600 35 0.6 450 Units V V % % V A A A mA kHz % % V V % m
VIN=2.2~5V, Load=10mA IOUT=10~1200mA VCC, voltage required to maintain H at VOUT CE/SS=VIN, No Load No external components, CE/SS=VIN, VFB=1.2V No external components, CE/SS=0V, VFB=0V Peak current VIN=5V, VOUT=2V Load=300mA, VIN=5V, VOUT=2V
Fosc Oscillator Frequency MAXDTY Maximum Duty Ratio PFMDTY PFM Duty Ratio VCEH VCEL EFFI Rdson
No load Apply 1.4V (min.) to CE/SS, determine CE/SS "High" Voltage VOUT "High" CE/SS "Low" Voltage Same as VCEH, determine VOUT/"Low" Efficiency VCC=5V, VOUT=3.3V, Load=300mA Rdson Condition IOUT=300mA, VIN=5V, VOUT=2V
AP1635 Rev. 4
4 of 8 www.diodes.com
FEBRUARY 2009
(c) Diodes Incorporated
AP1635
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER
Typical Performance Characteristics
Vcc vs. Operating Current
200 180 160 200
Vcc vs. Quiescent Current
180
Icc (uA)
Operating Current (uA)
Quiescent Current (uA)
160 140 120 100 80 60 40 20 0 2.5 3 3.5 4 4.5 5
140 120 100 80 60 40 20 0 2.5 3 3.5 4 4.5 5
Vcc (V)
Vcc (V)
Vcc vs. Stand-by Current
8 7.5 800 780 760 740 720 700 680 660 640 620 600 2.5 3 3.5 4 4.5 5 2.5
Vcc vs. Frequency
Stand-by Current (uA)
7 6.5 6 5.5 5 4.5 4
Frequency (KHz)
Vcc (V)
3
3.5
4
4.5
5
Vcc (V)
Vcc vs. Current Limit
1.4 1.3
Vcc vs. RDS(ON)
600 500
1.2
Current Limit (A)
1 0.9 0.8 0.7 0.6 0.5 3
Current Limit
RDS(ON) (m)
Vout=2V
1.1
400 300 200 100 0
3.5
4
4.5
5
2.5
3
3.5
Vc c
Vcc (V)
4
4 .5
5
AP1635 Rev. 4
5 of 8 www.diodes.com
FEBRUARY 2009
(c) Diodes Incorporated
AP1635
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER
Typical Performance Characteristics
Line Regulation
0.3 0.2 0.1
(Continued)
Load Regulation
3 2 1
V / VOUT (%)
0.0 -0.1 -0.2 -0.3 2.5 3 3.5 4 4.5 5
V / VOUT (%)
0 -1 -2 -3 0 200 400 600 800 1000 1200
Vcc (V)
Load (mA)
Typical Application Circuit
2.2V ~ 5.5V V IN 20 68u 0.1uF 1nF 1M 10uH PVcc AP1635 SVcc CE/SS GND SW B240A FB R1 0.1uF 68uF R2 VOUT
Vout = 1 x (1 +
R2
)
R1 R1=100K ~ 200K
AP1635 Rev. 4
6 of 8 www.diodes.com
FEBRUARY 2009
(c) Diodes Incorporated
AP1635
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER
Marking Information
(1) SOP-8L
( Top View )
8 5
Logo Part Number AP1635 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)
AP1635 Rev. 4
7 of 8 www.diodes.com
FEBRUARY 2009
(c) Diodes Incorporated
AP1635
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER
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.
AP1635 Rev. 4
8 of 8 www.diodes.com
FEBRUARY 2009
(c) Diodes Incorporated

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