AP1201
Single-Channel Power Distribution Switch
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. 0.4 Feb 10, 2004
1/9
Features
- 100mΩ typical on-resistance
- 2.7V to 5.5V input voltage
- Adjustable current-limit 0.7A to 1.25A
(AP1201A/C)
- Fixed current-limit (1.25A) for AP1201B
- Fault flag with internal delay circuit
- 1μA typical off-state supply current
- 65μA typical on-state supply current
- Output can be forced higher than input (off-state)
- Thermal shutdown
- 2.4V typical under voltage lockout (UVLO)
- Slow turn-on (soft-start) and fast turn-off
- Enable Active-High or active-Low
- SOT23-5L, SOT23-6L and SOT89-5L packages
Applications
- USB Power Switch
- Battery-charger circuits
- Hot plug-in power supplies
General Description
The AP1201 series are integrated high-side power
switch with enable, flag functions and adjustable
current-limit 0.7A to 1.25A, optimized for
self-powered and bus-powered Universal Serial
Bus (USB) applications. The AP1201 series support
the following USB requirements: each switch
channel supplies up to 700mA as required by USB
downstream devices; the switch’s low on-resistance
meets USB voltage drop requirements; fault current
is limited to typically 900mA~1.25A; and a flag
output is available to indicate fault conditions to the
local USB controller. Soft start eliminates the
momentary voltage drop on the upstream port that
may occur when the switch is enabled in
bus-powered applications.
Additional features include thermal shutdown to
prevent catastrophic switch failure from high-current
loads, under voltage lockout (UVLO) to ensure that
the device remains off unless there is a valid input
voltage present, and 3.3V and 5V logic compatible
enable inputs.
Pin Assignments
1
2
3 7
4
6
5
EN
SET
FLG
GND
OUT IN
SOT23-6L
AP1201C
1
2
3 7
4
5
EN SET
GND
OUT IN
SOT23-5L
AP1201A
1
2
3 7
4
5
EN FLG
GND
OUT IN
SOT23-5L
AP1201B
1
2
3 7
4
5
ENSET
GND
OUT
IN
SOT89-5L
AP1201A GND
1
2
3 7
4
5
EN
FLG
GND
OUTIN
SOT89-5L
AP1201B GND
Pin Descriptions
Name Descriptions
EN
Enable: Logic-compatible Enable input.
(H: active high, L: active low). Do not
float.
FLG
Fault Flag: Active-low, open-drain
output. Indicates over current, UVLO,
and thermal shutdown.
GND Ground: Supply return.
IN
Supply Input: Output MOSFET drain.
Also supplies IC’s internal circuitry.
Connect to
ositive su
l
.
OUT
Switch Output: Output MOSFET
source. Typically connect to switched
side of load.
SET
Current limit set input. A resistor pull
high to set current-limit value (A, C
type only).