Features: • Low voltage operation: Startup at 0.9 V min. (IOUT = 1 mA) guaranteed
• Low current consumption : During operation 18.7 A (3.3 V, 50 kHz, typ.) During shutdown: 0.5 A (max.)
• Duty ratio : Built-in PWM / PFM switching control circuit (S-8354 Series) 15 % to 83 % (30 kHz and 50 kHz models) 15 % to 78 % (250 kHz models)
• External parts : Coil, capacitor, and diode
• Output voltage : Selectable in 0.1 V steps between 1.5 and 6.5 V (for VDD / VOUT separate types) Selectable in 0.1 V steps between 2.0 and 6.5 V (for other than VDD / VOUT separate types)
• Output voltage accuracy : ±2.4%
• Oscillation frequency : 30 kHz, 50 kHz, and 250 kHz selectable
• Soft start function : 6 ms (50 kHz, typ.)
• Lead-free products
Application• Power supplies for portable equipment such as digital cameras, electronic notebooks, and PDAs
• Power supplies for audio equipment such as portable CD / MD players
• Constant voltage power supplies for cameras, VCRs, and communication devices
• Power supplies for microcomputersSpecifications
| Item |
Symbol |
Absolute maximum rating |
Unit |
| VOUT pin voltage |
VOUT |
VSS − 0.3 to VSS + 12 |
V |
| ON/OFF pin voltage (A type) *1 |
VON/OFF |
VSS − 0.3 to VSS + 12 |
V |
| VDD pin voltage (D type)*2 |
VDD |
VSS − 0.3 to VSS + 12 |
V |
| CONT pin voltage |
VCONT |
VSS − 0.3 to VSS + 12 |
V |
| CONT pin current |
ICONT |
300 |
mA |
| Power dissipation |
SOT-23-3 |
PD |
150 |
mW |
| SOT-23-5 |
250 |
mW |
| SOT-89-3 |
500 |
mW |
| Operating ambient temperature |
Topr |
−40 to + 85 |
|
| Storage temperature |
Tstg |
−40 to + 125 |
|
*1. With shutdown function
*2. For VDD / VOUT separate type Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions.
DescriptionThe S-8353/8354 Series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, a power MOS FET, an error amplifier, a phase compensation circuit, a PWM control circuit (S-8353 Series) and a PWM / PFM switching control circuit (S-8354 Series).
The S-8353/8354 Series can configure the step-up switching regulator with an external coil, capacitor, and diode. In addition to the above features, the small package and low current consumption make the S-8353/8354 Series ideal for portable equipment applications requiring high efficiency.
The S-8353 Series realizes low ripple, high efficiency, and excellent transient characteristics due to its PWM control circuit whose duty ratio can be varied linearly from 0 to 83% (from 0 to 78% for 250 kHz models), an excellently designed error amplifier, and phase compensation circuits.
The S-8354 Series features a PWM / PFM switching controller that can switch the operation to a PFM controller with a duty ratio is 15% under a light load to prevent a decline in the efficiency due to the IC operating current.
S-8354 Data Sheet
