AS1301
5V/50mA Low Noise Inductorless Boost Converter
D a ta S he e t
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 regulation 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
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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
(C
OUT
≤2.2µF,
C
FLY
≤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
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3 Applications
The device is ideal for dual/triple AA cells or single Li-Ion
battery cell to 5V conversion, mobile phones, portable
instruments, microprocessor based systems, remote
data-acquisition systems, inductorless DC-DC
conversion.
Figure 1. Block Diagram
C
FLY1
C1+
V
BATT
+
C1-
C
FLY2
C2+
C2-
5V Supply
V
OUT
C
OUT
2.2µF
V
BATT
C
BAT
2.2µF
AS1301
On
Off
EN
GND
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