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R1221N38AH-TR
R1221N38AH-TR - Brand New RICOH IC Chips
Credit Card - One-month free return and one year warranty.
- Full or Partial Refund, if the item is not as described
- Full Refund if you don't receive your order
■ OUTLINE
The R1221N Series are PWM step-down DC/DC Converter controllers embedded with
a voltage detector, with low supply current by CMOS process.
Each step-down DC/DC converter in these ICs consists of an oscillator, a PWM
control circuit, a reference voltage unit, an error amplifier, a soft-start
circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable
circuit, and resistors for voltage detection. A low ripple, high efficiency
step-down DC/DC converter can be composed of this IC with only four external
components, or a power-transistor, an inductor, a diode and a capacitor.
The output voltage of DC/DC converter can be supervised by the built-in
voltage detector.
With a PWM/VFM alternative circuit, when the load current is small, the
operation turns into the VFM oscillator from PWM oscillator automatically,
therefore the efficiency at small load current is improved.
And the PWM/VFM alternative circuit is an option, in terms of C version and D
version, the circuit is not included.
If the term of maximum duty cycle keeps on a certain time, the embedded
protection circuit works. There are two types of protection function. One is
latch-type protection circuit, and it works to latch an external Power MOS
with keeping it disable. To release the condition of protection, after disable
this IC with a chip enable circuit, enable it again, or restart this IC with
power-on. The other is Reset-type protection circuit, and it works to restart
the operation with soft-start and repeat this operation until maximum duty
cycle condition is released. Either of these protection circuits can be
designated by users’ request.
■ FEATURES
• Wide Range of Input Voltage · · · · · · · · · · · · · 2.3V to 13.2V
• Built-in Soft-start Function and two choices of Protection Function(Latch-
type or Reset-type)
• Two choices of Oscillator Frequency · · · · · · · · · · 300kHz, 500kHz
• High Efficiency · · · · · · · · · · · · · · · · · · · · · · TYP. 90%
• Standby Current · · · · · · · · · · · · · · · · · · · · · TYP. 0µA
• Setting Output Voltage · · · · · · · · · · · · · · · · · Stepwise setting
with a step of 0.1V in the range of 1.5V to 5.0V
• High Accuracy Output Voltage · · · · · · · · · · · · · · ±2.0%
• Setting Detector Threshold Voltage · · · · · · · · · · · Stepwise setting
with a step of 0.1V in the range of 1.2V to 4.5V
• High Accuracy Detector Threshold Voltage· · · · · · · ±2.0%
• Low Temperature-Drift Coefficient of Output Voltage · TYP. ±100ppm/°C
■ APPLICATIONS
• Power source for hand-held communication equipment, cameras, video
instruments such as VCRs, camcorders.
• Power source for battery-powered equipment.
• Power source for household electrical appliances.
Shipping
| First item | Additional item | Service | Description |
|---|---|---|---|
| $0.00 | Free | Free Shipping | Estimated 15-30 business days via Registered Air Mail or others |
| $27.50 | Free | Expedited Shipping | Estimated delivery time is 3-5 business days, with some areas possibly taking 6-9 business days depending on the shipping address. The main courier companies include but are not limited to UPS, DHL, and FedEx. |
| $0.00 | Free | Buyer cooperating carrier | Using buyer's cooperating carrier. Buyer should create a shipping label and share it to us. And then we will call carrier for pickup |
| $38.00 | Free | Expedited Shipping | Estimated delivery time is 3-5 business days, with some areas possibly taking 6-9 business days depending on the shipping address. The main courier companies include but are not limited to UPS, DHL, and FedEx. |
Delivery
- The transportation time may be delayed due to customs clearance, local holidays or abnormal events.
- The estimated time is based on the fastest speed provided by commercial couriers (DHL, FedEx, UPS etc).
- The estimated time does not include the lead time of the item. The lead time of most items is 2–5 business days. If more than 5 working days are needed, we will manually confirm with you.
| Flag | Country | Express Delivery | Standard Delivery |
|---|---|---|---|
 | United States | 3 - 5 days | 10-15 days |
 | Canada | 3 - 5 days | 10-20 days |
 | Mexico | 3 - 5 days | 10-17 days |
 | Germany | 3 - 5 days | 10-12 days |
 | Italy | 3 - 5 days | 10-15 days |
 | United Kingdom | 3 - 5 days | 10-12 days |
Estimated Delivery
This item requires 2-5 business days for processing before shipping after payment is confirmed. And depending on the destination and shipping method.
Return Policy
| Return window | Refund type | Return shipping |
|---|---|---|
| 60 days after receiving item | Money Back or Replacement | Buyer pays for return shipping |
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