AS1301
5V/50mA Low Noise Inductorless Boost Converter
Data Sheet
www.austriamicrosystems.com Revision 1.03 1 - 16
1 General Description
The AS1301 is a 50mA inductorless boost converter
using a double H-bridge charge-pump topology with two
external flying capacitors.
The AS1301 runs on a 1MHz fixed frequency and is
utilized with a low noise regulati on scheme to allow
usage together with sensitive RF circuitry from the same
battery supply.
Designed to reside in portable and space limited
equipment the 1MHz charge pump converts a 2.7 to
5.25V input to regulated 5V output with 5% accuracy.
The shutdown function reduces the supply current to
<5µA and disconnects the load from the output. The
integrated soft-start circuitry prevents current spikes
being drawn from the battery during start-up.
The AS1301 is available in TDFN (3x3x0.8mm) 10-pin
and WL-CSP 8-bumps packages.
2 Key Features
! Up to 92% Efficiency
! 2.7 to 5.25V Input Voltage
! Regulated 5V Output
! Automatic Mode Up-Switching
! <5µA Shutdown Current
! 5V Tolerant Enable Signal
! Up to 50mA Load Current
! Overload Protection
! Output Disconnected During Shutdown
! Soft-Start
! No Inductor Required
! Small External Components Required
(COUT ≤2.2µF, CFLY ≤220nF)
! Low Noise Fixed Frequency 1MHz Charge Pump:
- 1:1 Battery Feed Through Mode
- 2:3 Single Phase Mode
- 1:2 Dual Phase Mode
! Package Options:
- TDFN (3x3x0.8mm) 10-pin
- WL-CSP 8-bumps with 0.5mm pitch
3 Applications
The device is ideal for two or three AA cells or a single
Li-Ion battery cell to 5V conversion, mobile phones,
portable instruments, microprocessor based systems
and remote data-acquisition systems.
Figure 1. Typical Application Diagram
+
V
BATT
C
BAT
AS1301
2.2µF
VBATT
EN
GND
VOUT
C1+
C1-
C2+
C2-
V
OUT = 5V
C
OUT
2.2µF
On
Off
C
FLY1
C
FLY2