PC-UM10M
SL-5500 HARDWARE DESCRIPTION
– 24 –
2-10. DC/DC CONVERTER (TEA1206T)
(1) GENELAL DESCRIPTION
The TEA1206T is a fully integrated DC/DC converter. Efficient, compact
and dynamic power conversion is achieved using a novel, digitally con-
trolled concept like Pulse Width Modulation (PWM) or Pulse Frequency
Modulation (PFM), integrated low RDSon CMOS power switches with
low parasitic capacitances, and fully synchronous rectification.
The device operates at 560 kHz switching frequency which enables the
use of external components with minimum size. Deadlock is prevented
by an on-chip undervoltage lockout circuit.
Efficient behaviour during short load peaks and compatibility with Li-ion
batteries is guaranteed by an accurate current limiting function.
(2) BLOCK DIAGRAM
(3) PIN CONFIGURATION
(4) PINNING
P-type POWER FET
TEMPERATURE
PROTECTION
START-UP
CIRCUIT
LX
ILIM
GND
SYNC
SHDWN
FB
UPOUT / DNIN
U / D
4
2
6
5
8
1
7
3
N-type
POWER
FET
I / V
CONVERTER
I / V
CONVERTER
13 MHz
SYNC
GATE
OSCILLATOR
TIME
COUNTER
DIGITAL CONTROLLER
BAND GAP
REFERENCE
sense FET
CONTROL LOGIC
MODE GEARBOX
AND
INTERNAL
SUPPLY
TEA 1206T
MGM666
SYMBOL
PIN
DESCRIPTION
U/D
1
conversion mode selection input
ILIM
2
current limit resistor connection
UPOUT/DNIN
3
upconversion output voltage downconver-
sion input voltage
LX
4
inductor connection
SYNC
5
synchronization clock input
GND
6
ground
FB
7
feedback input
SHDWN
8
shut-down input
TEA 1206T
SHDWN
FB
GND
SYNC
ILIM
UPOUT / DININ
LX
U / D
MGM667