AS1301A-BWLT austriamicrosystems, AS1301A-BWLT Datasheet - Page 9

• Manufacturer Part Number: AS1301A-BWLT
• Description: IC BOOST/SW CAP 5V 50MA 8WLCSP
• Manufacturer: austriamicrosystems
• Type: Step-Up (Boost), Switched Capacitor (Charge Pump)r

Specifications of AS1301A-BWLT

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 50mA
• Frequency - Switching: 1MHz
• Voltage - Input: 2.7 ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: AS1301A-BWLTTR

AS1301
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1301 is a high efficiency and low noise switched capacitor DC-DC converter that is capable of boost operation. It is equipped with two
built-in coupled H-bridge type switch configurations. Based on the value of the output voltage the system automatically initiates mode-switching
to achieve the highest possible efficiency. The regulation of the output voltage is achieved by a regulation loop, which modulates the current
drive capability of the power transistors so that the amount of charge transferred from the input to the output at each clock cycle is controlled and
is equal to the charge needed by the load.
8.1 Regulation Loop
The AS1301 operates at constant frequency at any load. For the regulation loop power transistors, a resistor divider, and an error amplifier is
used to keep the output voltage within the allowed limits. The error amplifier takes the feedback and reference signals as inputs and generates
the error voltage signal. The error voltage controls a driver that triggers the gate of the power transistor which modulates the current drive
capability of the power transistors. The modulated power transistors control the charge transferred from the input to the output and therefore the
regulation of the output voltage is realized. Based on adjusting the amount of charge transferred, this regulation concept delivers the smallest
voltage ripple possible.
Figure 26. AS1301 - Functional Block Diagram
www.austriamicrosystems.com/DC-DC_Step-Up/AS1301
On
Off
+
VBATT
C
BAT
EN
Temp
POR
Ref
CLK
State Machine
Control Logic
&
C1+
Mode Select
C
Start
Soft
C1-
FLY1
Revision 1.05
Double-H Bridge
GND
Topology
C2+
C
FLY2
C2-
Vmode trig
V
ctrl
AS1301
VOUT
C
OUT
9 - 16