TB7109F Datasheet, PDF (1/15 Pages) Toshiba Semiconductor – Power supply IC for LNB

TOSHIBA BiCD Integrated Circuit Silicon Monolithic
TB7109F
TB7109F
Power supply IC for LNB
The TB7109F is single chip power supply ICs for LNB that integrated
buck DC-DC converter section utilizing a chopper circuit and series
regulator section. The TB7109F contains high-speed P-channel
MOSFETs for the high side main switch to achieve high efficiency. And
series regulator section is fed into a overcurrent circuit of fold buck type,
and it protects this product from the short circuit state of the load.
Features
HSON8-P-0505-1.27
• Output current: DC-DC Converter section IOUT1 = 500mA(max.)
Series Regulator section IOUT2 = 400mA(max.)
Weight: 0.068 g (typ.)
• High efficiency: DC-DC Converter section η = 95% (typ.) (@VIN1 = 24V, VOUT1 = 17V, IOUT1 = 300mA)
• Operating input voltage range: VIN1 = 8V to 27V
• On-state resistance: RDS(ON) = 0.7Ω (high-side) typical (@VIN1 = 24V, Tj = 25℃)
• Oscillation frequency: fOSC = 400kHz (typ.)
• Reference voltage: VREF = 1.215V ± 2.9% (@Tj = 25°C)
• Housed in a small surface-mount package (SOP Advance) with a low thermal resistance
• Soft-start feature
• Overcurrent protection: fold buck type for the Series Regulator section
ILMIT2(1) = 550mA(typ.)(@ VIN2 = 17V, VOUT2 = 12.5V), ILMIT2(2) = 100mA(typ.)(@ VIN2 = 17V, VOUT2 = 0V)
Part Marking
TB
7109F
Part Number (or abbreviation code)
Lot No.
Pin Assignment
V_FB1 EN V_FB2 V_OUT2
8 76
5
The dot (•) on the top surface indicates pin 1.
1
2
3
4
Lx V_IN1 V_IN2 GND
The lot number consists of three digits. The first digit represents the last digit of the year of manufacture,
and the following two digits indicates the week of manufacture between 01 and either 52 or 53.
Manufacturing week code
(The first week of the year is 01; the last week is 52 or 53.)
Manufacturing year code (last digit of the year of manufacture)
This product has a MOS structure and is sensitive to electrostatic discharge. Handle with care.
The product(s) in this document (“Product”) contain functions intended to protect the Product from temporary
small overloads such as minor short-term overcurrent, or overheating. The protective functions do not necessarily
protect Product under all circumstances. When incorporating Product into your system, please design the system
(1) to avoid such overloads upon the Product, and (2) to shut down or otherwise relieve the Product of such overload
conditions immediately upon occurrence. For details, please refer to the notes appearing below in this document
and other documents referenced in this document.
1
2011-05-19