Function Introduction To Tps62200 - BBK V3N Service Manual

◆ Dimming with Zero-inrush and Wide Frequency Range of 100 to 100kHz
◆ Over Voltage Protection
◆ Output Current up to 100mA at VOUT = 12V.
◆ Zero Shutdown Supply Current
◆ Minimize the External Component
◆ Small LC Filter
◆ Internal Soft Start
◆ RoHS Compliant and 100% Lead (Pb)-Free
3. PIN Description
PIN No.
1
2
3
4
5
6

3.5.4 Function introduction to TPS62200

1. Description
The TPS6220x devices are a family of high-efficiency synchronous step-down converters ideally
suited for portable systems powered by 1-cell Li-Ion or 3-cell NiMH/NiCd batteries. The devices are also
suitable to operate from a standard 3.3-V or 5-V voltage rail.
With an output voltage range of 6.0 V down to 0.7 V and up to 300 mA output current, the devices are
ideal to power low voltage DSPs and processors used in PDAs, pocket PCs, and smart phones. Under
nominal load current, the devices operate with a fixed switching frequency of typically 1 MHz. At light load
currents, the part enters the power save mode operation; the switching frequency is reduced and the
quiescent current is typically only 15 µA; therefore it achieves the highest efficiency over the entire load
current range. The TPS6220x needs only three small external components. Together with the tiny SOT23
package, a minimum system solution size can be achieved. An advanced fast response voltage mode
control scheme achieves superior line and load regulation with small ceramic input and output capacitors.
2. Features
◆ High Efficiency Synchronous Step-Down Converter With up to 95% Efficiency
◆ 2.5 V to 6.0 V Input Voltage Range
Symbol
LX
GND
FB
EN
OVP
VDD
I/O
O
Feedback Reference Voltage Pin
I
I
I
I
- -
49
Description
Switch Pin
Ground Pin
Chip Enable (Active High)
over voltage protection
Supply Input Voltage Pin