AP3421BDNTR-G1

AP3421BDNTR-G1 Datasheet

1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B

Part	Datasheet
AP3421BDNTR-G1	AP3421BDNTR-G1 (pdf)

Related Parts	Information
AP3421DNTR-G1	AP3421DNTR-G1
AP3421ADNTR-G1	AP3421ADNTR-G1

PDF Datasheet Preview
Preliminary Datasheet 1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B The AP3421/A/B is a fully integrated dual output voltage regulator. The two converters are current mode and internally compensated. The converters include integrated control and synchronous rectifier switches. The outputs are both rated for up to 1A. Both outputs are adjustable using external resistors. The step-down converters operate at 1.3MHz fixed switching frequency under normal load and in a pulse skipping mode for light loads. The switching clock is shifted 180° for SW2. The E/S pin provides an enable function and allows the converter to be synchronized to an external clock. With E/S held low, the AP3421/A/B draws less than 10µA current. In the start-up sequence, the VO1 output is designed to precede the VO2 output. The two outputs have controlled start-up sequence. Power On Reset POR function is provided by means of an open-drain output present on the POR pin. The POR function monitors VMON, FB1 and FB2, and pulls low if any of these begin to drop out. The POR is internally deglitched and provides a delayed recovery/reset time. The AP3421/A/B provides peak over-current protection, short circuit protection and thermal shutdown. Discharge-Before-Turn-On discharges the outputs completely before soft-starting to always bring them up in the proper sequence at start-up or after a POR For AP3421/A only . The AP3421/A/B is available in DFN-3x3-10 package. • VO1=1.8 to 3.6V at 1A • VO2=1.0 to 3.6V at 1A • Switching Frequency 1.3MHz • 180° Phase Shifted Switching • No Rectifier Diode Required • Optional External Clocking 2x Clock Required • Light Load Pulse Skipping • Enable/Sleep State • Internal Soft-start • Open-drain Power On Reset Monitors Input and • Outputs • Discharge-Before-Turn-On For AP3421/A • Pre-bias Function For AP3421B • Peak Over Current Protection • Short Circuit Protection • Over Temperature Shutdown • Hard Disk Drivers • Set Top Boxes DFN-3x3-10 Figure Package Type of AP3421/A/B BCD Semiconductor Manufacturing Limited Preliminary Datasheet 1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B Pin Configuration DN Package DFN-3x3-10 Pin 1 Mark Figure Pin Configuration of AP3421/A/B Top View Pin Description Pin Number 1 2 3 4 Pin Name FB2 AVIN PVIN SW2 PGND Function Feedback from VO2. Connect voltage divider to the load side of VO2 output inductor-capacitor filter Analog power input. Connect a 1µF ceramic capacitor between this pin and AGND Control MOSFET switch power input. Connect a 10µF ceramic capacitor between this pin and PGND, as close to the IC as possible VO2 synchronous buck switching output. Connect to VO2 inductor Power ground connection. Synchronous rectifier MOSFET source. Provide a star connection between this pin, VO1, VO2 filter capacitor returns, VIN input capacitor return, and AGND. Keep the star connection as close to the IC as possible VO1 synchronous buck switching output. Connect to VO1 inductor Enable/Synchronization. Pulling this pin high statically enables the IC and pulling the pin low statically will shut down the IC. Applying a pulse to this pin will synchronize SW1 and SW2 switching frequency to the external clock frequency BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet 1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B Pin Description Continued Pin Number 9 10 11 Pin Name VMON FB1 AGND Function Power on reset output pin. Monitors FB1, FB2 output voltage levels and VIN. POR is pulled low if an output voltage drop is detected on FB1 or FB2 or VIN, and is Hi-Z during normal operation Voltage for one external voltage could be input voltage . The POR output is triggered if this output falls below the VMON threshold Feedback from VO1. Connect voltage divider to the load side of VO1 output inductor-capacitor filter Signal ground connection. Provide a star connection between this pin and PGND pin BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet 1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B Functional Block Diagram Figure Functional Block Diagram of AP3421/A/B BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet 1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B Ordering Information AP3421 Circuit Type A AP3421A B AP3421B Blank AP3421 Package DN DFN-3x3-10 G1 Green TR Tape & Reel Package DFN-3x3-10 Temperature Range -40 to 85°C AP3421DNTR-G1 AP3421ADNTR-G1 AP3421BDNTR-G1 Marking ID BCB BDD BDE Packing Type Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Absolute Maximum Ratings Note 1 Parameter Input Voltage Feedback Voltage E/S Pin Voltage SW1, SW2 Pin Voltage Thermal Resistance Operating Junction Temperature Storage Temperature Lead Temperature Soldering, 10sec VIN VFB VE/S VSW TJ TSTG TLEAD Value to 7 to VIN+0.3 to VIN+0.3 VPGND-1 to VIN+1 33 150 -25 to 150 260 Unit V ºC /W ºC ºC ºC Note 1 Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Recommended Operating Conditions Parameter Input Voltage VO1 Maximum Output Current VO2 Maximum Output Current Operating Ambient Temperature AP3421 AP3421A/B IO1 Max IO2 Max Unit BCD Semiconductor Manufacturing Limited Preliminary Datasheet 1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B Electrical Characteristics VIN =VE/S=5V, TA=25℃, unless otherwise specified. Parameter Operating Input Voltage Supply Current Shutdown Supply Current Under Voltage Lockout Threshold

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Preliminary Datasheet
1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B

The AP3421/A/B is a fully integrated dual output voltage regulator. The two converters are current mode and internally compensated. The converters include integrated control and synchronous rectifier switches. The outputs are both rated for up to 1A. Both outputs are adjustable using external resistors.

The step-down converters operate at 1.3MHz fixed switching frequency under normal load and in a pulse skipping mode for light loads. The switching clock is shifted 180° for SW2. The E/S pin provides an enable function and allows the converter to be synchronized to an external clock. With E/S held low, the AP3421/A/B draws less than 10µA current.

In the start-up sequence, the VO1 output is designed to precede the VO2 output. The two outputs have controlled start-up sequence.

Power On Reset POR function is provided by means of an open-drain output present on the POR pin. The POR function monitors VMON, FB1 and FB2, and pulls low if any of these begin to drop out. The POR is internally deglitched and provides a delayed recovery/reset time.

The AP3421/A/B provides peak over-current protection, short circuit protection and thermal shutdown. Discharge-Before-Turn-On discharges the outputs completely before soft-starting to always bring them up in the proper sequence at start-up or after a POR For AP3421/A only .

The AP3421/A/B is available in DFN-3x3-10 package.
• VO1=1.8 to 3.6V at 1A
• VO2=1.0 to 3.6V at 1A
• Switching Frequency 1.3MHz
• 180° Phase Shifted Switching
• No Rectifier Diode Required
• Optional External Clocking 2x Clock Required
• Light Load Pulse Skipping
• Enable/Sleep State
• Internal Soft-start
• Open-drain Power On Reset Monitors Input and
• Outputs
• Discharge-Before-Turn-On For AP3421/A
• Pre-bias Function For AP3421B
• Peak Over Current Protection
• Short Circuit Protection
• Over Temperature Shutdown
• Hard Disk Drivers
• Set Top Boxes

DFN-3x3-10

Figure Package Type of AP3421/A/B BCD Semiconductor Manufacturing Limited

Preliminary Datasheet 1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B Pin Configuration

DN Package DFN-3x3-10

Pin 1 Mark

Figure Pin Configuration of AP3421/A/B Top View

Pin Description

Pin Number
1 2 3 4

Pin Name

FB2 AVIN PVIN SW2

PGND

Function

Feedback from VO2. Connect voltage divider to the load side of VO2 output inductor-capacitor filter Analog power input. Connect a 1µF ceramic capacitor between this pin and AGND Control MOSFET switch power input. Connect a 10µF ceramic capacitor between this pin and PGND, as close to the IC as possible VO2 synchronous buck switching output. Connect to VO2 inductor Power ground connection. Synchronous rectifier MOSFET source. Provide a star connection between this pin, VO1, VO2 filter capacitor returns, VIN input capacitor return, and AGND. Keep the star connection as close to the IC as possible VO1 synchronous buck switching output. Connect to VO1 inductor Enable/Synchronization. Pulling this pin high statically enables the IC and pulling the pin low statically will shut down the IC. Applying a pulse to this pin will synchronize SW1 and SW2 switching frequency to the external clock frequency

BCD Semiconductor Manufacturing Limited 2

Preliminary Datasheet 1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B Pin Description Continued

Pin Number
9 10 11

Pin Name

VMON FB1

AGND

Function

Power on reset output pin. Monitors FB1, FB2 output voltage levels and VIN. POR is pulled low if an output voltage drop is detected on FB1 or FB2 or VIN, and is Hi-Z during normal operation Voltage for one external voltage could be input voltage . The POR output is triggered if this output falls below the VMON threshold Feedback from VO1. Connect voltage divider to the load side of VO1 output inductor-capacitor filter Signal ground connection. Provide a star connection between this pin and PGND pin

BCD Semiconductor Manufacturing Limited 3

Preliminary Datasheet 1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B Functional Block Diagram

Figure Functional Block Diagram of AP3421/A/B

BCD Semiconductor Manufacturing Limited 4

Preliminary Datasheet
1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B
Ordering Information

AP3421

Circuit Type

A AP3421A B AP3421B Blank AP3421

Package DN DFN-3x3-10

G1 Green TR Tape & Reel

Package

DFN-3x3-10

Temperature Range
-40 to 85°C

AP3421DNTR-G1 AP3421ADNTR-G1 AP3421BDNTR-G1

Marking ID

BCB BDD BDE

Packing Type

Tape & Reel

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.

Absolute Maximum Ratings Note 1

Parameter

Input Voltage Feedback Voltage E/S Pin Voltage SW1, SW2 Pin Voltage Thermal Resistance Operating Junction Temperature Storage Temperature Lead Temperature Soldering, 10sec

VIN VFB VE/S VSW TJ TSTG TLEAD

Value
to 7 to VIN+0.3 to VIN+0.3 VPGND-1 to VIN+1
33 150 -25 to 150 260

Unit

V ºC /W ºC ºC ºC

Note 1 Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

Parameter

Input Voltage VO1 Maximum Output Current VO2 Maximum Output Current Operating Ambient Temperature

AP3421 AP3421A/B

IO1 Max IO2 Max

Unit

BCD Semiconductor Manufacturing Limited

Preliminary Datasheet
1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B

Electrical Characteristics

VIN =VE/S=5V, TA=25℃, unless otherwise specified.

Parameter

Operating Input Voltage

Supply Current Shutdown Supply Current

Under Voltage Lockout Threshold

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Datasheet ID: AP3421BDNTR-G1 509845