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temperature ranges from −40 to 125ºC. It is capable for automotive use that demands high reliability. Protection, and Power-good function. The AP3440 is housed in a 28-pin QFN0505 package. Figure 1. Application
[AP3440] 016008997-E-00 2016/10 - 2 - 3. Table of Contents
Figure 2. Block Diagram
- Pin Configurations and Functions
Figure 3. Pin Configurations
1 FSIN I
2 EN I Enable Signal Input
The AP3440 starts operation by “H” signal input.
3 SGND － Signal Ground
4 SS I/O Soft Start Pin
Connect a capacitor between this pin and the SGND for soft start time adjustment.
5 CC O
compensation of the error amplifier.
6 VO1 I Output Voltage Feedback
8 TEST1 I Test Pin
10 TEST3 I
11 PGND1 －
13 PGND3 －
14 PGND4 －
15 NC － Open Pin
16 SW1 O
17 SW2 O
18 SW3 O
19 SW4 O
20 SW5 O
21 SW6 O
22 PVIN1 I
24 PVIN3 I
25 PVIN4 I
26 VIN I Control Power Input
27 PG O Power-Good Signal Output
Open drain output of the N-ch MOSFET. This output is off by power-good.
28 FSO O External Synchronous Clock Output
Internal oscillator or external synchronous clock is inverted and output. Exposed Pad Connect to the ground plane of the printed circuit board for heat dissipation.
Figure 4. Power Dissipation WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes.
- Recommended Operating Conditions
Maximum value of 10% duty in every 25ms. Figure 5. Iout Profile
- AKM assumes no responsibility for the usage beyond the conditions in this data sheet.
[AP3440] 016008997-E-00 2016/10 - 7 - 9. Electrical Characteristics (VIN=5.05V, Tj=-40°C~150°C, unless otherwise specified) Parameter Symbol Min Typ Max Unit Condition Output Voltage Accuracy (Note 5) Vout 1.092 1.112 1.135 V VIN Pin Current (in operation) Isupply - - 3 mA VIN Shut-down Current Ishd1 - - 1 uA Tj=25°C PVIN Shut-down Current Ishd2 - - 1 uA Tj=25°C Over Current Protection Threshold OCL 5.5 7.85 10.2 A Coil Peak Current Over Voltage Protection Threshold OVP 126 134 142 % Vout ratio Oscillation Frequency Freq 1950 2100 2250 kHz Soft Start Charging Current Iss 24 30 36 uA Soft Start Finishing Threshold Vss 1.11 1.17 1.23 V Soft Start Time Tss 2.1 3.9 6.7 ms Css=0.1uF High-side Minimum On-pulse SWUMINon - - 85 ns Low-side Minimum On-pulse SWLMINon - - 132 ns High-side On-resistance of Internal Switching MOSFET RDSONH - 91 139 mΩ Include Cu wire resistor Low-side On-resistance of Internal Switching MOSFET RDSONL - 41 69 mΩ Include Cu wire resistor Under Voltage Lock Out Threshold(UVLO) VD 3.8 3.95 4.1 V Output Voltage Monitoring Threshold (H) (Note 5) PWGDH 1.144 1.164 1.183 V Output Voltage Monitoring Threshold ( L) (Note 5) PWGDL 1.046 1.063 1.081 V PG_BAD Detection Time TRESET1 1 - 4.7 us PG_GOOD Detection Time TRESET2 8 10 12 ms PG Output MOSFET On-resistance RMOSON - - 50 Ω Drain Current =20mA EN Pin Pull-down Resistance REN 60 100 140 kΩ EN Pin Input Voltage “H” (Note 2) VSHDNH 2.0 - 5.5 V EN Pin Input Voltage “L” (Note 2) VSHDNL 0 - 0.4 V MOSFET On-resistance for EN Off Output Discharge RMOSON - - 200 Ω Discharging Current = 10mA Line Regulation (Note 3) ΔVline - - 0.685 %/V Vin=4.7~5.4V Load Regulation (Note 3) ΔVload - - 0.3 % Io=0.1~3.5A Load Transient Response (Note 3) Io=2↔3.5A Slew rate= 0.2A/us Overshoot VtranO - - 30.4 mV Undershoot VtranU - - 33.0 mV Thermal Protection Threshold (Note 2, Note 4) Ttsd 155 175 200 °C Thermal Protection Hysteresis (Note 2, Note 4) TSDhys 1 25 50 °C FSIN Pin Pull-down Resistance RFSIN 350 500 650 kΩ FSIN Pin Input Voltage “H” (Note 2) VSHDNH 2.0 5.5 V FSIN Pin Input Voltage “L” (Note 2) VSHDNL 0 0.4 V Note 2. Guaranteed by design. Note 3. A reference value with the recommended circuit. Note 4. This function is to protect the IC from an overheat situation. Functional operation of the device including its reliability is not guaranteed under the condition that the overheat status beyond the specifications continues. Note 5. There is no overlap between Output Voltage and Output Voltage Monitoring since these values are interlocked by tracking.
Figure 6. Timing Chart values at Normal Operation after Soft-Start is completed. is turned off in 10ms after VOUT is returned into power-good range again.
11.1 Normal Operation
the coil current reaches a target value after internal high-side P-channel MOSFET is turned on.
11.2 External Synchronous Function
is fixed to “H” level since a falling edge of the internal clock is not generated. Figure 7. External Synchronous Timing Chart
11.3 Extrenal Synchronous Clock Output
11.4 Power Good Function
and soft start operation. Refer to the section “9. Electrical Characteristics” about PWGDH and PWGDL.
11.5 Over Voltage Protection (OVP)
The output voltage Vout is limited so as not to rise drastically from the setting value.
11.6 Under Voltage Loc kout (UVLO )
The AP3440 stops operation when the input voltage drops to a level that is out of operational range. DCDC internal circuit is powered off.
11.7 Over Current Protection (OCL: Over Current Limit)
decreases farther, the AP3440 goes into hiccup mode. Figure 8. OCL vs Vout soft-start capacitor is discharged by 1.5uA to reduce the voltage at the SS pin.
the SS pin voltage drops to 0.52V. Hiccup operation is disabled during soft start. Figure 9. Hiccup Timing Chart T1: Soft Start Setting Time. Charging current is 30uA. T2: 6 count time of drive frequency. Hiccup mode detection is executed only in this period. times as Soft Start Setting Time T1.
11.8 Thermal Protection (TSD: Thermal Shut Down)
The AP3440 stops operation if the chip temperature overs 175°C (typ) for protection. The AP3440 restarts by soft start when the chip temperature drops.
11.9 Output Capacitor Discharge
EN pin or when the VIN voltage becomes less than 3V.
- Recommended External Circuits
Figure 16. Typical Application
Figure 17. Top Layer Figure 18. Bottom Layer ground directly under the device. Wirings for switching node that are connected to SW pins should be short and thick.
[AP3440] 016008997-E-00 2016/10 - 16 - 16. Revision History Date (Y/M/D) Revision Page Contents 17/02/08 00 - First Edition
[AP3440] 016008997-E-00 2016/10 - 17 - IMPORTANT NOTICE 0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the information contained in this document without notice. When you consider any use or application of AKM product stipulated in this document ( “Product”), please make inquiries the sales office of AKM or authorized distributors as to current status of the Products. 1. All information included in this document are provided only to illustrate the operation and application examples of AKM Products. AKM neither makes warranties or representations with respect to the accuracy or completeness of the information contained in this document nor grants any license to any intellectual property rights or any other rights of AKM or any third party with respect to the information in this document. You are fully responsible for use of such information contained in this document in your product design or applications. AKM ASSUMES NO LIABILITY FOR ANY LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM THE USE OF SUCH INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS. 2. The Product is neither intended nor warranted for use in equipment or systems that require extraordinarily high levels of quality and/or reliability and/or a malfunction or failure of which may cause loss of human life, bodily injury, s erious property damage or serious public impact, including but not limited to, equipment used in nuclear facilities, equipment used in the aerospace industry, medical equipment, equipment used for automobiles, trains, ships and other transportation, traffic signaling equipment, equipment used to control combustions or explosions, safety devices, elevators and escalators, devices related to electric power, and equipment used in finance- related fields. Do not use Product for the above use unless specifically agreed by AKM in writing. 3. Though AKM works continually to improve the Product’s quality and reliability, you are responsible for complying with safety standards and for providing adequate designs and safeguards for your hardware, software and systems which minimize risk and avoid situations in which a malfunction or failure of the Product could cause loss of human life, bodily injury or damage to property, including data loss or corruption. 4. Do not use or otherwise make available the Product or related technology or any information contained in this document for any military purposes, including without limitation, for the design, development, use, stockpiling or manufacturing of nuclear, chemical, or biological weapons or missile technology produc ts (mass destruction weapons). When exporting the Products or related technology or any information contained in this document, you should comply with the applicable export control laws and regulations and follow the procedures required by such laws and regulations. The Products and related technology may not be used for or incorporated into any products or systems whose manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations. 5. Please contact AKM sales representative for details as to environmental matters such as the RoHS compatibility of the Product. Please use the Product in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances, including without limitation, the EU RoHS Directive. AKM assumes no liability for damages or losses occurring as a result of noncompliance with applicable laws and regulations. 6. Resale of the Product with provisions different from the statement and/or technical features set forth in this document shall immediately void any warranty granted by AKM for the Product and shall not create or extend in any manner whatsoever, any liability of AKM. 7. This document may not be reproduced or duplicated, in any form, in whole or in part, w ithout prior written consent of AKM.