Pin SMD Data
DC / DC converters
***********************
FAN6862 = ABx
LD7550IL_BL = xxP/50
OB2252 = 52xxx
OB2262 = 62xxx
OB2273 = 73xxx
SG6858TZ = AAIxx
UC3863G_L = U863
USING CERAMIC OUTPUT CAPACITORS WITH THE MAX1734 VOLTAGE-MODE BUCK CONVERTER
Abstract: The MAX1734 voltage-mode buck DC-DC converter was design to work with medium ESR tantalum capacitors; however, by slightly changing the feedback scheme, small, low-ESR ceramic capacitors may be used. A schematic, design equations, and load-transient response waveforms are provided.
Many stepdown (buck) DC-DC controller ICs incorporate a voltage-mode control algorithm. As a result (for stable operation in continuous-conduction mode), the resulting application circuit's output capacitor is normally a high-ESR tantalum type. The circuit of Figure 1, however, allows use of an inexpensive ceramic output capacitor. To remove the effects of phase lag in the feedback loop, feedback is derived from the LX pin instead of the output.
Figure 1. In this simple application circuit, a stepdown DC-DC converter operates with a ceramic output capacitor.
A ceramic-capacitor circuit offers several benefits over the standard application circuit. First, ceramic capacitors are more readily available than tantalum types. Second, (see Figure 2) they cause less output ripple (<5mVPP vs. >20mVPP), and less load-transient overshoot (<50mVPP vs. >100mVPP). IC11 needs 20mVPP or more at the OUT pin for stable operation under load. To meet this requirement, first calculate the R1 value:
Figure 2. Load-transient response waveforms (top traces) show that a ceramic output capacitor produces lower output ripple and less overshoot.
Per the MAX1734 data sheet, VOUT is 1.5V or 1.8V, L1 is 10µH, Tmin is 0.4µsec, ILOADMAX is 250mA, and IOUTSENSE is 4µA. The result is R1 = 4.3kΩ for VOUT = 1.8V, and R1 = 5.2kΩ for VOUT = 1.5V. R1 may therefore be rounded to 5kΩ. Next, calculate the feedforward-capacitor value:
If R1 = 5kΩ and VOUT = 1.5V, then Cff < 12nF. Select Cff = 10nF. Choosing a much smaller value will cause excessive load-transient overshoot, and choosing a larger value will cause instability under loaded conditions. For optimized load transients, the inductor series resistance should be
In this case the RL value should be about 200mΩ, which allows use of a small inductor and causes an approximate efficiency drop of only 3% at maximum load. Because the inductor time constant L1/RL is matched to the feedback time constant R1 × Cff, the short-term load-transient response equals the DC load regulation (Figure 2). If RL is chosen less than 200mΩ, the peak-to-peak load-transient voltage will increase but the DC load regulation will decrease.
Finally, choose COUT large enough for stability:
where ΔIL is approximately 100mA when the MAX1734 operates with a 10µH inductor. In this case, COUT should be greater than 4µF.
1The MAX1734 stepdown DC-DC converter supplies a fixed 1.8V or 1.5V output at 250mA from an input voltage range of 2.7V to 5.5V. Its 5-pin SOT23 package and internal synchronous rectifier allows a small application circuit with a minimum number of external components.
Figure 1. In this simple application circuit, a stepdown DC-DC converter operates with a ceramic output capacitor.
A ceramic-capacitor circuit offers several benefits over the standard application circuit. First, ceramic capacitors are more readily available than tantalum types. Second, (see Figure 2) they cause less output ripple (<5mVPP vs. >20mVPP), and less load-transient overshoot (<50mVPP vs. >100mVPP). IC11 needs 20mVPP or more at the OUT pin for stable operation under load. To meet this requirement, first calculate the R1 value:
Figure 2. Load-transient response waveforms (top traces) show that a ceramic output capacitor produces lower output ripple and less overshoot.
Per the MAX1734 data sheet, VOUT is 1.5V or 1.8V, L1 is 10µH, Tmin is 0.4µsec, ILOADMAX is 250mA, and IOUTSENSE is 4µA. The result is R1 = 4.3kΩ for VOUT = 1.8V, and R1 = 5.2kΩ for VOUT = 1.5V. R1 may therefore be rounded to 5kΩ. Next, calculate the feedforward-capacitor value:
If R1 = 5kΩ and VOUT = 1.5V, then Cff < 12nF. Select Cff = 10nF. Choosing a much smaller value will cause excessive load-transient overshoot, and choosing a larger value will cause instability under loaded conditions. For optimized load transients, the inductor series resistance should be
In this case the RL value should be about 200mΩ, which allows use of a small inductor and causes an approximate efficiency drop of only 3% at maximum load. Because the inductor time constant L1/RL is matched to the feedback time constant R1 × Cff, the short-term load-transient response equals the DC load regulation (Figure 2). If RL is chosen less than 200mΩ, the peak-to-peak load-transient voltage will increase but the DC load regulation will decrease.
Finally, choose COUT large enough for stability:
where ΔIL is approximately 100mA when the MAX1734 operates with a 10µH inductor. In this case, COUT should be greater than 4µF.
1The MAX1734 stepdown DC-DC converter supplies a fixed 1.8V or 1.5V output at 250mA from an input voltage range of 2.7V to 5.5V. Its 5-pin SOT23 package and internal synchronous rectifier allows a small application circuit with a minimum number of external components.
RT9266B
The RT9266B is a compact, high efficiency, and low voltage step-up DC/DC converter with an Adaptive Current Mode PWM control loop, includes an error amplifier, ramp generator, comparator, switch pass element and driver in which providing a stable and high efficient operation over a wide range of load currents. It operates in stable waveforms without external compensation.The low start-up input voltage below 1V makes RT9266B suitable for 1 to 4 battery cells applications with a 500mA internal switch. The 550kHz high switching rate minimized the size of external components. Besides, the 25μA low quiescent current together with high efficiency maintains long battery lifetime.
Friday, 26 January 2018
SMPS Chips Data
PWM IPS in the housings SOT-23-6, SOT-26, TSOP-6
By Imran Ashraf Khan
In the circuitry of modern pulsed power supplies (SMPS), PWM regulators, made in small-sized planar cases with six terminals, have gained wide popularity. The body type designation can be SOT-23-6, SOT-23-6L, SOT-26, TSOP-6, SSOT-6. The layout and layout of the pins are shown in the figure below. In this case, the left fragment of the picture shows the code marking LD7530A
Pin Assignment:
1 - GND. (Common wire).
2 - FB. (FeedBack - Feedback). Input for controlling the pulse duration with a signal from the output voltage. Sometimes it can have the designation COMP (input comparator).
3 - RI / RT / CT / COMP / NC - Depending on the type of chip, it can be used for a frequency-assigning RC circuit (RI / RT / CT) or for protection, as a PWM tripping comparator input with a threshold value at its input, specified in the document. In some types of microcircuits this input can be not involved in any way (NC - No Connect).
4 - SENSE, different CS (Current Sense) - Input from the current sensor at the source of the key.
5 - VCC - Input voltage supply and start the chip.
6th - OUT (GATE) - Output to control the gate of the key.
1 - GND. (Common wire).
2 - FB. (FeedBack - Feedback). Input for controlling the pulse duration with a signal from the output voltage. Sometimes it can have the designation COMP (input comparator).
3 - RI / RT / CT / COMP / NC - Depending on the type of chip, it can be used for a frequency-assigning RC circuit (RI / RT / CT) or for protection, as a PWM tripping comparator input with a threshold value at its input, specified in the document. In some types of microcircuits this input can be not involved in any way (NC - No Connect).
4 - SENSE, different CS (Current Sense) - Input from the current sensor at the source of the key.
5 - VCC - Input voltage supply and start the chip.
6th - OUT (GATE) - Output to control the gate of the key.
Functionally similar regulators work on the principle of popular earlier PWM chips xx384x series, which have proved themselves in terms of reliability and stability.
Some difficulties often arise when replacing or selecting an analog for similar PWM controllers due to the use of code marking in the designation of the type of microcircuit. The situation is complicated by a large number of component manufacturers, which do not always provide documentation for mass access, and not all manufacturers of ready-made devices supply repair service centers with circuits, so real repair schemes often have to be studied by repairers on the installed components and wiring connections directly on the board.
In practice, PWM chips and EAxxx and Eaxxx marking codes are often found. Official documents on them are not found in free access, but discussions on the forums and pieces of pictures from the PDF from System General, which publishes them as SG6848T and SG6848T2, have been preserved. The picture is attached.
To the attention of the masters we offer tables made up of information available on the Internet and PDF documents for the selection of analogs when replacing the most common six-legged planar PWM with pinout: pin1 - GND, pin2 - FB (COMP), pin4 - Sense, pin5 - Vcc, pin6 - OUT .
Their main difference is the application and purpose of the output 3.
Their main difference is the application and purpose of the output 3.
PWM controllers (PWM), without using output 3.
| Name | Part Namber | Diler | Marking |
|---|---|---|---|
| SG6849 | SG684965TZ | Fairchild / ON Semi | BBxx |
| SG6849 | SG6849-65T, SG6849-65TZ | System General | MBxx EBxx |
| SGP400 | SGP400TZ | System General | AAKxx |
PWM-regulators (PWM) with the installation of the resistor 95-100 kOhm to pin 3.
Using the PWM listed below, the frequency should be set by the resistor RT (RI) from pin 3 to ground. Usually its rating is chosen 95-100 kOhm for frequency 65-100 KHz. More precisely see the attached documentation. PDF files are packaged in RAR.
| Name | Part Namber | Diler | Marking |
|---|---|---|---|
| AP3103A | AP3103AKTR-G1 | Diodes Incorporated | GHL |
| AP8263 | AP8263E6R, A8263E6VR | AiT Semiconductor | S1xx |
| AT3263 | AT3263S6 | ATC Technology | 3263 |
| CR6848 | CR6848S | Chip-Rail | 848H16 |
| CR6850 | CR6850S | Chip-Rail | 850xx |
| CR6851 | CR6851S | Chip-Rail | 851xx |
| FAN6602R | FAN6602RM6X | Fairchild / ON Semi | ACCxx |
| FS6830 | FS6830 | FirstSemi | |
| GR8830 | GR8830CG | Grenergy | 30xx |
| GR8836 | GR8836C, GR8836CG | Grenergy | 36xx |
| H6849 | H6849NF | HI-SINCERITY | |
| H6850 | H6850NF | HI-SINCERITY | |
| HT2263 | HT2263MP | HOT-CHIP | 63xxx |
| KP201 | Kiwi Instruments | ||
| LD7531 | LD7531GL, LD7531PL | Leadtrend | xxP31 |
| LD7531A | LD7531AGL | Leadtrend | xxP31A |
| LD7535 / A | LD7535BL, LD7535GL, LD7535ABL, LD7535AGL | Leadtrend | xxP35-xxx35A |
| LD7550 | LD7550BL, LD7550IL | Leadtrend | xxP50 |
| LD7550B | LD7550BBL, LD7550BIL | Leadtrend | xxP50B |
| LD7551 | LD7551BL / IL | Leadtrend | xxP51 |
| LD7551C | LD7551CGL | Leadtrend | xxP51C |
| NX1049 | XN1049TP | Xian-Innuovo | 49xxx |
| OB2262 | OB2262MP | On-Bright-Electronics | 62xx |
| OB2263 | OB2263MP | On-Bright-Electronics | 63xx |
| PT4201 | PT4201E23F | Powtech | 4201 |
| R7731 | R7731GE / PE | Richtek | 0Q = |
| R7731A | R7731AGE | Richtek | IDP = xx |
| SD4870 | SD4870TR | Silan Microelectronics | 4870 |
| SF1530 | SF1530LGT | SiFirst | 30xxx |
| SG5701 | SG5701TZ | System General | AAExx |
| SG6848 | SG6848T, SG6848T1, SG6848TZ1, SG6848T2 | Fairchild / ON Semi | AAHxx EAxxx |
| SG6858 | SG6858TZ | Fairchild / ON Semi | AAIxx |
| SG6859A | SG6859ATZ, SG6859ATY | Fairchild / ON Semi | AAJFxx |
| SG6859 | SG6859TZ | Fairchild / ON Semi | AAJMxx |
| SG6860 | SG6860TY | Fairchild | AAQxx |
| SP6850 | SP6850S26RG | Sporton Lab | 850xx |
| SP6853 | SP6853S26RGB, SP6853S26RG | Sporton Lab | 853xx |
| SW2263 | SW2263MP | SamWin | |
| UC3863 / G | UC3863G-AG6-R | Unisonic Technologies Co | U863 U863G |
PWM controllers in which pin 3 is used differently.
When using the PWM controllers listed below, you should pay attention to pin 3, which can be used to organize protection - thermal or from exceeding the input voltage.
The frequency can be fixed at 65kHz, or be set by the capacitor rating on pin 3.
When replacing any microcircuits with analogs, carefully study the documentation. PDF files are packed in the RAR archive.
The frequency can be fixed at 65kHz, or be set by the capacitor rating on pin 3.
When replacing any microcircuits with analogs, carefully study the documentation. PDF files are packed in the RAR archive.
| Name | Part Namber | Diler | Marking |
|---|---|---|---|
| AP3105 / V / L / R | AP3105KTR-G1, AP3105VKTR-G1, AP3105LKTR-G1, AP3105RKTR-G1 | Diodes Incorporated | GHN GHO GHP GHQ |
| AP3105NA / NV / NL / NR | AP3105NAKTR-G1, AP3105NVKTR-G1, AP3105NLKTR-G1, AP3105NRKTR-G1 | Diodes Incorporated | GKN GKO GKP GKQ |
| AP3125A / V / L / R | AP3125AKTR-G1, AP3125VKTR-G1, AP3125LKTR-G1, AP3125RKTR-G1 | Diodes Incorporated | GLS GLU GNB GNC |
| AP3125B | AP3125BKTR-G1 | Diodes Incorporated | GLV |
| AP3125HA / HB | AP3125HAKTR-G1, AP3125HBKTR-G1 | Diodes Incorporated | GNP GNQ |
| AP31261 | AP31261KTR-G1 | Diodes Incorporated | GPE |
| AP3127 / H | AP3127KTR-G1, AP3127HKTR-G1 | Diodes Incorporated | GPH GSH |
| AP3301 | AP3301K6TR-G1 | Diodes Incorporated | GTC |
| FAN6862 | FAN6862TY | Fairchild / ON Semi | ABDxx |
| FAN6863 | FAN6863TY, FAN6863LTY, FAN6863RTY | Fairchild / ON Semi | ABRxx |
| HT2273 | HT2273TP | HOT-CHIP | 73xxx |
| LD7510 / J | LD7510GL, LD7510JGL | Leadtrend | xxP10 xxP10J |
| LD7530 / A | LD7530PL, LD7530GL, LD7530APL, LD7530AGL | Leadtrend | xxP30 xxxP30A |
| LD7532 | LD7532GL | Leadtrend | xxP32 |
| LD7532A | LD7532AGL | Leadtrend | xxP32A |
| LD7532H | LD7532HGL | Leadtrend | xxP32H |
| LD7533 | LD7533GL | Leadtrend | xxP33 |
| LD7536 | LD7536GL | Leadtrend | xxP36 |
| LD7536R | LD7536RGL | Leadtrend | xxP36R |
| LD7537R | LD7537RGL | Leadtrend | xxP37R |
| ME8204 | ME8204M6G | MicrOne | ME8204xx |
| NCP1250 | NCP1250ASN65T1G, NCP1250BSN65T1G, NCP1250ASN100T1G, NCP1250BSN100T1G | ON Semiconductor | 25xxxx |
| NCP1251 | NCP1251ASN65T1G, NCP1251BSN65T1G, NCP1251ASN100T1G, NCP1251BSN100T1G | ON Semiconductor | 5xxxxx |
| OB2273 | OB2273MP | On-Bright-Electronics | 73xx |
| R7735 | R7735AGE, R7735HGE, R7735GGE, R7735RGE, R7735LGE | Richtek | |
| UC3873 / G | UC3873-AG6-R, UC3873G-AG6-R | Unisonic Technologies | U873 U873G |
The table is updated as information becomes available.
How to read the specs: For example say 00HC5W
(1) Code "00" This means that the output voltage variable or can diajust by changing the value of the feedback resistor.
(2) The "H" code indicates that the maximum input allowable voltage is 10v.
(3) The code "C5" indicates that the maximum current capability of 1.5A
Example usage:
How to read LDO LCD 8-pin regulator code 00HC5W
- This kind of regulator is often found on the Toshiba LCD motherboard, and the shape is similar to ic eeprom.
- The BD writing code is not written on the physical ic regulator. So for example just written 00IC0W, 00IA5W
How to read the specs: For example say 00HC5W
(1) Code "00" This means that the output voltage variable or can diajust by changing the value of the feedback resistor.
(2) The "H" code indicates that the maximum input allowable voltage is 10v.
(3) The code "C5" indicates that the maximum current capability of 1.5A
Example usage:
- Input Voltage: 8.0v
- Output voltage: 1.5v to 7v - can be obtained by changing the value of R1 / R2
6 pin Regulator SMD Chip Codes
6 pin PWM IC code
5xy= NCP1251,
IDP606 = R7731A,
63xxx = OB2263,
WP35/XP35 = LD7535,
ABx = FAN6862,
xxP/50 = LD7550IL_BL,
xxP/50 = LD7550IL_BL
52xxx = OB2252
62xxx = OB2262
73xxx = 0B2273
AAIxx = SG6858TZ
G6G = AP4313
37x = LD7537
6 pin PWM IC code
5xy= NCP1251,
IDP606 = R7731A,
63xxx = OB2263,
WP35/XP35 = LD7535,
ABx = FAN6862,
xxP/50 = LD7550IL_BL,
xxP/50 = LD7550IL_BL
52xxx = OB2252
62xxx = OB2262
73xxx = 0B2273
AAIxx = SG6858TZ
G6G = AP4313
37x = LD7537
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