zxld1601 Zetex Semiconductors plc., zxld1601 Datasheet - Page 10

• Manufacturer Part Number: zxld1601
• Description: Zxld1601 - Adjustable Dc-dc Boost Converter With Internal Switch In Sc70
• Manufacturer: Zetex Semiconductors plc.

Diode selection
The rectifier diode (D1) should be a fast low
capacitance Schottky diode with low reverse leakage at
the working voltage. It should also have a peak current
rating above the peak coil current and a continuous
current rating higher than the maximum output load
current.
The table below gives some typical characteristics for
diodes that can be used with the ZXLD1601:
Layout considerations
PCB tracks should be kept as short as possible to
minimize ground bounce, and the ground pin of the
device should be soldered directly to the ground plane.
It is particularly important to mount the coil and the
input/output capacitors close to the device to minimize
parasitic resistance and inductance, which will
degrade efficiency. The FB pin is a high impedance
input, so PCB track lengths to this should also be kept
as short as possible to reduce noise pickup. Excess
capacitance from the FB pin to ground should be
avoided.
ZXLD1601
Diode
ZHCS400
ZHCS500
S E M I C O N D U C T O R S
V
300
300
F
@ 100mA (mV)
I
1000
1000
FSM
(mA)
Ic (mA)
400
500
10
I
15
15
R
at 30V ( A)
ISSUE 3 - AUGUST 2004
Package
SOD323
SOT23