Driver Transistor Built-In Step-Down DC/DC Converters
Synchronous PWM, Non Synchronous PWM/PFM Switchable
XC9211/ 9212 Series
Preliminary
November 18, 2002 Ver. 2
Applications
P channel Driver Transistor Built-In
Synchronous (N channel Switching Transistor Built-in)
z Mobile phones (PDC, GSM, CDMA, IMT2000 etc.)
z PDA, Portable communication modem
z Portable game
Input Voltage Range
Output Voltage Range
Oscillation Frequency
Output Current
: 1.8V ~ 6.0V
: 0.9V ~ 4.0V
: 300kHz, 600kHz, 900kHz
: 400mA
z Camera, Digital camera
z Cordless phone
Maximum Duty Ratio
: 100%
z Note book computer
PWM/PFM Switching Control (XC9212 : Non Synchronous)
Ceramic Capacitor Compatible
Ultra Small Packages : SOT-25 & USP-6B
General Description
Features
The XC9211/9212 series is a group of synchronous-rectification
type DC/DC converters with a built-in 0.6 Ω P-channel driver
transistor and N-channel switching transistor, designed to allow
the use of ceramic capacitors. The ICs enable a high efficiency,
stable power supply with an output current of 400 mA to be
configured using only a coil and two capacitors connected
externally.
P ch driver Tr. Built-in : On resistance 0.6Ω
N ch driver Tr. Built-in : On resistance 0.6Ω (Synchronous)
Output Voltage Range : 0.9V ~ 4.0V (0.1V step)
Fixed output voltage accuracy ±2%
Minimum operating voltage is 1.8 V. Output voltage is internally
programmable in a range from 0.9 V to 4.0 V in increments of
0.1 V (accuracy: ± 2.0%). With the built-in oscillator, oscillation
frequency is selectable from 300 kHz, 600 kHz and 900 kHz to
make available the frequency best suited to your particular
application. As for operation mode, the XC9211 series is of a
synchronous-rectified PWM control type, while the XC9212
series can be manually switched between the PWM control
mode with synchronous rectification and the automatic
PWM/PFM switching control mode with non synchronous
rectification, allowing fast response, low ripple and high
efficiency over the full range of load (from light load to high
output current conditions). The soft start and current control
functions are internally optimized. During standby, all circuits
are shutdown to reduce current consumption to as low as 0.5 µA
or less. With the built-in U.V.L.O. (Under Voltage Lock Out)
function, the internal P channel driver transistor is forced OFF
when input voltage becomes 1.6 V or lower. Two types of
packages, 250 mW (SOT-25) and 100 mW (USP-6B), are
available depending on applications.
Oscillation Frequency : 300kHz, 600kHz, 900kHz
Fixed oscillation frequency
accuracy ±15%
Stand-by function
: Istb = 0.5µA (max.)
Soft start circuit built-in
Current limiter circuit built-in
: 600mA
Typical Application Circuit
Electrical Characteristics XC9212A186
VOUT
L
Output Voltage 1.8V Fixed, FOSC : 600kHz
L=10µH (CDRH4D18)
CIN=4.7µF (Ceramic), CL=10µF (Ceramic)
VIN
(400mA)
1
2
3
VIN
5
Lx
(
)
SD *
100
CIN
(ceramic)
CL
(ceramic)
PWM/PFM Automatic Switch (Non-Synchronous)
VSS
80
60
CE/MODE
CE/ VOUT
MODE
4
40
PWM (Synchronous)
3.6V
VIN=2.4
10
Output Current IOUT (mA)
20
0
L
: 10µH (SUMIDA CDRH4D18)
: 10µH (Ceramic)
0.1
1
100
1000
CL
CIN
SD
: 4.7µH (Ceramic)
: CRS02 (TOSHIBA Schottky Diode)
* SD is externally set up for XC9212 series when used in non-synchronous PWM operation with large current.
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