Datasheet

Low-Cost Multichemistry Battery Chargers
Table 3. Component List for Circuit of Figure 2
DESIGNATION QTY DESCRIPTION
C1 2
10µF, 50V 2220-size ceramic
capacitors
TDK C5750X7R1H106M
C4 1
22µF, 25V 2220-size ceramic
capacitor
TDK C5750X7R1E226M
C5 1
1µF, 25V X7R ceramic capacitor
(1206)
Murata GRM31MR71E105K
Taiyo Yuden TMK316BJ105KL
TDK C3216X7R1E105K
C9, C10 2
0.01µF, 16V cer am i c cap aci tor s ( 0402)
Murata GRP155R71E103K
Taiyo Yuden EMK105BJ103KV
TDK C1005X7R1E103K
C11, C14,
C15, C20
4
0.1µF, 25V X7R ceramic capacitors
(0603)
Murata GRM188R71E104K
TDK C1608X7R1E104K
C12, C13, C16 3
1µF, 6.3V X5R ceramic capacitors
(0603)
Murata GRM188R60J105K
Taiyo Yuden JMK107BJ105KA
TDK C1608X5R1A105K
D1 (optional) 1
10A Schottky diode (D-PAK)
Diodes, Inc. MBRD1035CTL
ON Semiconductor MBRD1035CTL
D2 1
Schottky diode
Central Semiconductor
CMPSH1–4
DESIGNATION QTY DESCRIPTION
D3 1
Schottky diode
Central Semiconductor CMPSH1-4
L1 1
10µH, 4.4A inductor
Sumida CDRH104R-100NC
TOKO 919AS-100M
N1 1
Dual, n-channel, 8-pin SO MOSFET
Fairchild FDS6990A or FDS6990S
P1 1
Single, p-channel, 8-pin SO MOSFET
Fairchild FDS6675
R5 1 1kΩ ±5% resistor (0603)
R6 1 59kΩ ±1% resistor (0603)
R7 1 19.6kΩ ±1% resistor (0603)
R11 1 12kΩ ±5% resistor (0603)
R12 1 15kΩ ±5% resistor (0603)
R13 1 33Ω ±5% resistor (0603)
R14 1 10.5kΩ ±1% resistor (0603)
R15, R16 2 8.25kΩ ±1% resistors (0603)
R17 1 19.1kΩ ±1% resistor (0603)
R18 1 22kΩ ±1% resistor (0603)
R19, R20 2 10kΩ ±1% resistors (0603)
RS1 1
0.01Ω ±1%, 0.5W 2010 sense resistor
Vishay Dale WSL2010 0.010 1.0%
IRC LRC-LR2010-01-R010-F
RS2 1
0.015Ω ±1%, 0.5W 2010 sense
resistor
Vishay Dale WSL2010 0.015 1.0%
IRC LRC-LR2010-01-R015-F
U1 1
MAX1908ETI+, MAX8724ETI+, or
MAX8765ETI+, MAX8765AETI+
2) Place the IC and signal components. Keep the
main switching node (LX node) away from sensitive
analog components (current-sense traces and REF
capacitor). Important: The IC must be no further
than 10mm from the current-sense resistors.
Keep the gate-drive traces (DHI, DLO, and BST)
shorter than 20mm, and route them away from the
current-sense lines and REF. Place ceramic
bypass capacitors close to the IC. The bulk capac-
itors can be placed further away.
3) Use a single-point star ground placed directly
below the part at the backside exposed pad of the
MAX1908/MAX8724/MAX8765/MAX8765A.
Connect the power ground and normal ground to
this node.
MAX1908/MAX8724/MAX8765/MAX8765A
28
Maxim Integrated