ACT8309 DC/DCs Datasheet

ACT8309 Datasheet PDF, Equivalent


Part Number

ACT8309

Description

(ACT8309 - ACT8311) PWM Step-Down DC/DCs

Manufacture

Active-Semi

Total Page 10 Pages
Datasheet
Download ACT8309 Datasheet


ACT8309
ACT8309/8310/8311
Rev 1, 15-Nov-12
1.5A, PWM Step-Down DC/DCs in TDFN
FEATURES
Multiple Patents Pending
Up to 95% High Efficiency
Up to 1.5A Guaranteed Output Current (ACT8311)
1.35MHz Constant Frequency Operation
Internal Synchronous Rectifier Eliminates
Schottky Diode
ACT8309: Up to 900mA
ACT8310: Up to 1.2A
ACT8311: Up to 1.5A
100% Duty Cycle Low-Dropout Operation
0.1µA Shutdown Current
Small TDFN33-8 Package
RoHS-Compliant
Enable/Disable Control
Minimal External Components
APPLICATIONS
Wireless Handhelds
Portable Devices
GPS/PND equipment
GENERAL DESCRIPTION
The patent-pending ACT8309/ACT8310/ACT8311
are current-mode, fixed-frequency PWM, synchro-
nous step-down DC/DC converters that are capable
of delivering 1.5A with efficiency of up to 95%.
These devices operate with a fixed frequency of
1.35MHz, minimizing noise in sensitive equipment
as well as optimizing both efficiency and component
size and cost.
These devices feature very low-resistance power
MOSFET and 100% duty cycle operation, making
them ideal choices for portable applications requir-
ing a 3.0V or 3.3V rail to be generated from a Li+
battery.
The ACT8311 is capable of supplying up to 1.5A of
output current, while the ACT8309 and ACT8310
are capable of supplying up to 900mA and 1.2A,
respectively. All three devices have adjustable out-
put voltages that are programmable down to 1.2V.
Contact Active-Semi for custom fixed output voltage
availability.
SYSTEM BLOCK DIAGRAM
2.7V to 5.0V
ON
OFF
Power-OK
Output
IN SW
ACT8311
EN FB
POK
GP G
VOUT
Up to 1.5A
Pb-free
Innovative PowerTM
- 1 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.

ACT8309
ACT8309/8310/8311
Rev 1, 15-Nov-12
ORDERING INFORMATION
PART
NUMBER
ACT8309NHADJ-T
ACT8309NHxyz-T
ACT8310NHADJ-T
ACT8310NHxyz-T
ACT8311NHADJ-T
ACT8311NHxyz-T
OUTPUT
CURRENT
0.9A
0.9A
1.2A
1.2A
1.5A
1.5A
OUTPUT
VOLTAGE
Adjustable
1.2V, 1.5V, 1.8V,
2.5V, 3.0V, 3.3Vc
Adjustable
1.2V, 1.5V, 1.8V,
2.5V, 3.0V, 3.3Vc
Adjustable
1.2V, 1.5V, 1.8V,
2.5V, 3.0V, 3.3Vc
PACKAGE
TDFN33-8
TDFN33-8
TDFN33-8
TDFN33-8
TDFN33-8
TDFN33-8
PINS
8
8
8
8
8
8
TEMPERATURE
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
c: Fixed output voltage options are available for production subject to minimum order quantities. Contact Active-Semi for more informa-
tion regarding fixed output voltage options.
PIN CONFIGURATION
IN 1
GP 2
IN 3
G4
ACT8309
ACT8310
ACT8311
8 SW
7 EN
6 POK
5 FB
PIN DESCRIPTIONS
TDFN33-8
PIN NAME
DESCRIPTION
1, 3 IN Power Input. Bypass to GP close to IC with a high quality ceramic capacitor.
2 GP Power Ground. Connect to G with a short trace.
4 G Analog Ground. Connect to GP with a short trace.
Feedback Node. For fixed output voltage versions, connect this pin directly to the output. For
5 FB the adjustable output versions the voltage at this pin is regulated to 0.8V, connect to this pin
to the center of the output feedback resistor divider for voltage setting.
Open-Drain Power-OK Status Output. POK is an open-drain output which sinks current when
6 POK the output voltage is less than 95% of the normal value. When the IC is disabled, POK is high
impedance.
7
EN
Enable Input. When higher than 1.4V, this pin turns the IC on. When lower than 0.4V, this pin
turn the IC off.
8 SW Switch Output. Connect this pin to the switching end of the inductor.
Innovative PowerTM
- 2 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.


Features Active-Semi FEATURES • • • • • • • • • • • ACT8309/8310/ 8311 Rev PrA, 24-Jan-08 Advanced Produc t Information – All Information Subje ct to Change 1.5A, PWM Step-Down DC/DC s in TDFN GENERAL DESCRIPTION The paten t-pending ACT8309/ACT8310/ACT8311 are c urrent-mode, fixed-frequency PWM, synch ronous step-down DC/DC converters that are capable of delivering 1.5A with eff iciency of up to 95%. These devices ope rate with a fixed frequency of 1.35MHz, minimizing noise in sensitive equipmen t as well as optimizing both efficiency and component size and cost. These dev ices feature very low-resistance power MOSFET and 100% duty cycle operation, m aking them ideal choices for portable a pplications requiring a 3.0V or 3.3V ra il to be generated from a Li+ battery. The ACT8311 is capable of supplying up to 1.5A of output current, while the AC T8309 and ACT8310 are capable of supply ing up to 900mA and 1.2A, respectively. All three devices have adjustable output voltages that are programmable down to 1.2V. .
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