AP1624 Datasheet, PDF (1/7 Pages) Anachip Corp – PWM/PFM Dual Mode Step-up DC/DC Controller

PWM/PFM Dual Mode Step-up DC/DC Controller
AP1624
„ Features
- Input Voltage Range: 0.9~6V
- PWM/PFM Switching Control
- High Efficiency: 90%
- Oscillator Frequency: 300kHz（±15%）
- Stand-by Current: I_STB=3µA.（Typ.）
- Pb-Free Package: SOT23-5
„ Applications
- Electronic Information Organizers
- Palmtops
- Cellular and portable phones
- Portable Audio Systems
- Various Multi-function Power Supplies
„ General Descriptions
The AP1624 is multi-functional step-up DC/DC
controllers. Large output current is possible using
an externally connected N channel MOSFET, coil,
and diode.
Output voltage （V_OUT）is programmable with 1.23V
of standard voltage supply internal, and using
externally connected components, output voltage
（FB） can be set up at will.
With a 300KHz switching frequency, the size of the
external components can be reduced.
Control switches from PFM to PWM during light
loads with the AP1624（PFM/PWM switchable）and
the series is highly efficient from light loads to large
output currents.
During stand-by time （CE pin “Low”）, current
consumption is reduced to 3µA.
„ Pin Assignment
„ Pin Descriptions
(TOP VIEW)
EXT
GND
5
4
1
2
3
FB
V_CC
CE
SOT23-5
Pin Pin
No. Name
Function
1 FB Feedback pin
2 V_CC IC Power Supply pin
Chip Enable:
3 CE H: Enable
L: Disable
4 GND GND pin
5 EXT External N-MOSFET Connection
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.1 Dec.23, 2004
1/7