Step-Up/Step-Down DC-DC Converter for 1-Cell Lithium-Ion Batteries
Table 1
Vendor
Coilcraft
Part No.
DO330P-153
D03316P-153
D01608C-153
LQH4N150K
LQH3C150K
CDR74B-150MC
CD43-150
Contact
(847) 639-6400
www.coilcraft.com
VIN
2
ILC6360
R5
R6
3
muRata
Sumida
(814) 237-1431
www.murata.com
(847) 956-0666
www.japanlink.com/sumida
LBI/SD
ON/OFF
7
GND
CD54-150
TDK
NLC453232T-150K (847) 390-4373
www.tdk.co.jp
Fig 5: Shut Down Control
Power Good Output (POK)
The power good output of the ILC6360 indicates when VOUT
Capacitors
is within the regulation tolerance of the set output voltage.
POK output is an open drain device capable of sinking
2mA. It will remain pulled low until the output voltage has
Input Capacitor
The input capacitor is necessary to minimize the peak cur-
rent drawn from the battery. Typically a 100µF tantalum
capacitor is recommended. Low equivalent series resistance
(ESR) capacitors will help to minimize battery voltage ripple.
risen to typically 95% of the specified VOUT
.
Adjustable Output Voltage Selection
The ILC6360-ADJ allows the output voltage to be set using
a potential divider. The formula for setting the adjustable
output voltage is:
Output Capacitor
Low ESR capacitors should be used at the output of the
ILC6360 to minimize output ripple. The high switching
speeds and fast changes in the output capacitor current,
mean that the equivalent series resistance of the capacitor
can contribute greatly to the output ripple. In order to mini-
mize these effects choose an output capacitor with less
than 10nH of equivalent series inductance (ESL) and less
than 100mΩ of equivalent series resistance (ESR).
Typically these characteristics are met with ceramic capac-
itors, but may also be met with certain types of tantalum
capacitors. Suitable capacitor manufacturers are shown in
table 2. A parallel combination of 10µF and 100µF is rec-
ommended at the output
VOUT = VFB x (1+R1/R2)
Where VFB is the feedback voltage which is 1.25V nominal.
ILC6360CIR-ADJ
COUT
L
10µF 100µF
CIN
10µF
1
2
3
4
8
7
6
5
LX
VOUT
GND
+
+
+
VOUT
15µH
VIN
VIN
R1
R2
LBI/SD
SYNC
LBO
VFB
ON
OFF
Ext Sync
(Connect to GND if unused)
Table 2
Adjustable Voltage Configuration
Description
Vendor
Contact
T495 series tantalum
595D series tantalum
TAJ, TPS series tantalum
Kemet
(864) 963-6300
Sprague (603) 224-1961
AVX
TDK
AVX
Taiyo
Yuden
(803) 946-0690
(847) 390-4373
(803) 946-0690
(408) 573-4150
EXTERNAL COMPONENT SELECTION
X7R Ceramic
Inductors
The ILC6360 is designed to work with a 15µH inductor in
most applications. There are several vendors who supply
standard surface mount inductors for this value. Suggested
inductor manufacturers are shown in table 1. Higher values
of inductance will improve efficiency, but will reduce peak
inductor current and consequently ripple and noise, but will
also limit output current.
Impala Linear Corporation
(408) 574-3939
ILC6360 1.1
www.impalalinear.com
Jan 1999
8
IMPALA [ Impala Linear Corporation ]
