AP1625 Datasheet, PDF (1/5 Pages) Anachip Corp – PWM/PFM Dual Mode Step-down DC/DC Controller

PWM/PFM Dual Mode Step-down DC/DC Controller
AP1625
„ Features
- Input voltage range:2.2V~8V（V_OUT type）
- Adjustable version（±2.5%）
- Oscillator frequency: 270KHz（±15%）
- High Efficiency: 92%（typ .）
- Stand-by capability: I_STB＝3µA.（max .）
- Soft-start time set-up externally type possible
- Output voltage type possible（FB）
- Package: SOT23-5
„ Applications
● Electronic Information Organizers
● Palmtops
● Cellular and portable phones
● Portable Audio Systems
● Various Multi-function Power Supplies
„ General Descriptions
The AP1625 series are multi-functional step-down
DC/DC converters with built-in speed, low ON
resistance drivers. A more than 1A output current is
possible using an externally connected transistor,
coil, diode and capacitor.
Output voltage is set-up by external resistor（. ±2.5%
accuracy）.
With a 270KHz switching frequency, the size of the
external components can be reduced.
Control switches from PWM to PFM during light
loads with the AP1625（PWM/PFM switchable）and
the series is highly efficient from light loads to large
output currents.
In relation to soft-start time external capacitor
regulated types.
During stand-by time （CE pin “LOW”）,current
consumption is reduced to less than 0.5µA.
With U.V.L.O internal, the external MOSFET. Will
be forcibly switched off if used below the stipulated
voltage.
„ Pin Assignment
„ Pin Descriptions
(Top View)
FB
CE
5
4
1
2
3
V_OUT
V_DD
GND
SOT23-5
Pin No.
1
Pin
Name
Function
V _OUT External PMOSFET Connection
2
V _DD Power Supply
3
GND Ground
4
CE
Chip Enable
Soft-start capacitor connection
5
FB Feedback pin
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 May.27, 2004
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