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Xiang Shuo
Xiang Shuo

AM9108 Datasheet Preview

AM9108 Datasheet

HIGH EFFICIENCY STEP-UP DC/DC CONVERTER

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AM9108 pdf
TINY PACKAGE HIGH EFFICIENCY
STEP-UP DC/DC CONVERTER
„ Introduction
The AM9108/9 is a CMOS step-up
switching DC/DC converter that mainly
consists of a reference voltage source, an
oscillator, and a comparator. The G908/9
allows the duty ratio to be automatically
switched according to the load (light load:
50%, high output current: 75%), enabling
products with a low ripple over a wide
range, high efficiency, and high output
current. With the G908/9, a step-up
switching DC/DC converter can be
configured by using an external coil,
capacitor, diode and NMOS or NPN. The
built-in MOSFET is turned off by a
protection circuit when the voltage at the
LX pin exceeds the limit to prevent it from
being damaged. This feature, along with
the mini package and low current
consumption, makes the G908/9 ideal for
applications such as the power supply unit
of portable equipment.
AM9108/9
„ Features
• Low voltage operation: Startup at 0.9 V
min. (IOUT = 1 mA) guaranteed
• Duty ratio: 66/78%, builtin auto switching
• External parts: Coil, capacitor, diode,
NMOS
• High efficiency±85%typ.
• Output voltage Adjustable
• Providing Flexibility for Using Internal
and ExternalPower Switches
• Zero Shutdown Mode Supply Current
• 6µA Quiescent (Switch-off) Supply
Current
• Small SOT23-5,SOT89-5 Package &
SOT-26(customer order
„ Applications
• PDA
• DSC
• LCD Panel
• RF-Tags
• MP3
• Portable Instrument
• Wireless Equipment
„ Ordering Information
AM9108/9
TEL:0755-36848411
http://www.sz-xiangshuo.com
FAX:0755-29765461



Xiang Shuo
Xiang Shuo

AM9108 Datasheet Preview

AM9108 Datasheet

HIGH EFFICIENCY STEP-UP DC/DC CONVERTER

No Preview Available !

AM9108 pdf
HIGH EFFICIENCY STEP-UP DC/DC CONVERTER
„ Block Diagrams
AM1908/9
AM9108
„ Pin Assignment
AM9109
Pin No.SOT23-5
Pin Name
AM9108A AM9108B AM9109A AM9109B
1 1 1 1 FB
2 2 2 2 VDD
- 3 - 3 EN
3 - 3 - NC
4 4 4 4 VSS
5 5 - - EXT
- - 5 5 LX
Functions
Feedback Input Pin Internal Reference Voltage
for the Error Amplifier is 1.25V.
IC power supply pin
Chip Enable (Active High)
No Connection
GND pin
Output Pin for Driving External NMOS
Pin for Switching
Pin No.SOT89-5
AM9108A AM9108B AM9109A
-1-
1-1
222
333
- -4
44 -
555
Pin Name
AM9109B
1 EN
- NC
2 VDD
3 FB
4 LX
- EXT
5 VSS
Functions
Chip Enable (Active High)
No Connection
IC power supply pin
Feedback Input Pin Internal Reference Voltage
for the Error Amplifier is 1.25V.
Pin for Switching
External transistor connection pin
GND pin
TEL:0755-36848411
http://www.sz-xiangshuo.com
FAX:0755-29765461


Part Number AM9108
Description HIGH EFFICIENCY STEP-UP DC/DC CONVERTER
Maker Xiang Shuo
Total Page 6 Pages
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