iC-WD A/B/C
SWITCHED-MODE DUAL VOLTAGE REGULATOR
Rev D1, Page 2/12
DESCRIPTION
The device iC-WD is a monolithic switching regula- The downstream linear regulators feature a low resid-
tor with two downstream 5 V resp. 3.3 V linear reg- ual ripple even with relatively small smoothing capac-
ulators. In view of the high efficiency of the down itors in the µF range. The output voltages have an
converter for an input voltage range of 8 to 36 V, the internal reference and are specified ±5% in the en-
iC-WD family is well-suited for industrial applications tire operating and temperature range. The use of two
which require a stabilised 5 V resp. 3.3 V power sup- mutually independent linear regulators makes it pos-
ply with minimal power dissipation and few compo- sible to isolate the voltage supply of sensitive ana-
nents.
logue circuits or sensors from the supply for digital
and driver devices.
Switching transistor, free-wheeling diode and oscil-
lator are integrated, limiting the necessary external The chip temperature and the output voltages are
elements for the switching regulator to the inductor, monitored. A fault is signalled via the current-limited
the back-up capacitor and one resistor. This resistor open-collector output NER, for example by an LED
determines the regulator’s cut-off current and thus its display or a logical link with other error signals from
efficiency in the particular application at hand.
the system. In the event of overtemperature, the
switching regulator is disabled to reduce the power
dissipation of the chip.
PACKAGES SO8, SO8tp, DFN10 to JEDEC Standard
PIN CONFIGURATION SO8, SO8tp
(top view)
PIN FUNCTIONS
No. Name Function
1 NER Error Output
2 VBR Pin for shunt
3 VHL Pin for inductor
4 GND Ground (reference voltage)
1
2
3
4
8
7
6
5
NER
VBR
VHL
GND
VB
VCCA
VCC
VH
5 VH
Intermediate Voltage
6 VCC Output (200 mA)
7 VCCA Output (25 mA)
8 VB
Supply Voltage
The Thermal Pad (optional) is to be connected to a Ground Plane on the PCB.
PIN CONFIGURATION DFN10
(top view)
PIN FUNCTIONS
No. Name Function
1 NER Error Output
2 n.c.
3 VBR Pin for shunt
4 VHL Pin for inductor
5 GND Ground (reference voltage)
6 GND Ground (reference voltage)
1
2
10
9
iC−WDx
...
3
8
7
6
4
7 VH
Intermediate Voltage
...yyww
5
8 VCC Output (200 mA)
9 VCCA Output (25 mA)
10 VB
Supply Voltage
The Thermal Pad is to be connected to a Ground Plane on the PCB.
Orientation of the package label ( WDx ...yyww) may vary.
ICHAUS [ IC-HAUS GMBH ]
