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ACE732E Schematic ( PDF Datasheet ) - ACE Technology

Teilenummer ACE732E
Beschreibung Step-Down Converter
Hersteller ACE Technology
Logo ACE Technology Logo 




Gesamt 10 Seiten
ACE732E Datasheet, Funktion
ACE732E
6V/3.5A, Fast Response, Step-Down Converter
Description
ACE732E belongs to a new breed of high frequency synchronous Step-Down converter that combines the
advantages of voltage mode control and Constant-On-Time control. Its adaptive Constant-On-Time control
dynamically changes switch on time to achieve a constant switching frequency. It does not have the
minimum on-time constrain normally a fixed-frequency current mode Step-down requires, allowing it to go
down to very low duty ratio without affecting loop stability. The voltage mode nature of ACE732E also
provides a more superior load transient response and a seamless transition from PFM to PWM modes.
ACE732E is capable of supplying output with current up to 3.5A at 1.2V output. All these features make
ACE732E an excellent choice for ARM based CPU power supply.
Features
Adaptive COT control
Up to 95% Efficiency
Up to 91% Efficiency for low output voltage
Up to 3.5A Max Output current
Feedback voltage 0.45V
Excellent load transient response
DFN2X2-8L Package
Application
ARM based CPUs
Tablet, MID
Smart Phone
Smart Set-Top Box, OTT
Absolute Maximum Rating
Parameter
Value
VIN Voltage
-0.3V~6V
All Other Pin Voltage
VIN-0.3V~VIN0.3V
SW to ground current
Internally limited
Operating Temperature Range
-40°C~85°C
Storage Temperature Range
-55°C~150°C
Thermal Resistance
θJA
75 °C /W
Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability.
VER 1.2 1






ACE732E Datasheet, Funktion
ACE732E
6V/3.5A, Fast Response, Step-Down Converter
Transient Response: VIN=5V, VOUT=1.2V, IOUT=0.3-3A
Output Short Response: VIN=5V, VOUT=1.2V, Output short to GND
FUNCTIONAL DECRIPTIONS
ACE732E belongs to a new breed of high frequency synchronous Step-Down converter that combines the
advantages of voltage mode control and Constant On time control. Its adaptive Constant-On-Time control
dynamically changes switch on time to achieve a constant switching frequency. It does not have the
minimum on-time constrain normally a fixed-frequency current mode Step-down requires, allowing it to go
down to very low duty ratios without affecting loop stability. The voltage mode nature of ACE732E also
provides a more superior load transient response as well as a seamless transition from PFM to PWM modes.
It can also operate up to 100% duty. It has a cycle by cycle current limit and a hiccup mode that protects
against dead-short condition. It includes soft-start, UVLO and thermal shutdown protection.
Adaptive Constant On-Time Control
ACE732E uses an adaptive Constant-On-Time control scheme that the ON time is dynamically adjusted
according to VIN and VOUT so to achieve a nearly constant switching frequency. This control scheme
provides simpler compensation and superior transient response over traditional constant frequency current
mode control, while still maintaining the advantage of switching at a constant frequency at about 1.5MHz. It
also provides a seamless transition from PFM to PWM that normally a constant frequency current mode
control scheme is hard to achieve. Further mode, because it is a COT control scheme, the system can
achieve high step-down ratio at ease, because lower constrain on the minimum on- time requirement
existing in constant frequency scheme.
100% Duty operation
ACE732E can operate at 100% duty cycle under dropout condition for high efficiency purpose.
Current Limit and Short-Circuit protection
ACE732E employs a cycle-by-cycle peak current limit and it also has a hiccup mode that protects the circuit
during dead-short condition. When the dead-short condition is removed, the IC goes back to normal
operation.
Soft-start
ACE732E has an internal soft-start circuitry to reduce supply inrush current during startup conditions.
When the device exits under-voltage lockout (UVLO), shutdown mode, or restarts following a
VER 1.2 6

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