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1.2MHz Low-Cost,
High-Performance Chargers
SYSTEM LOAD
RS1
ADAPTER
Q1a
15m Ω
Q1b
R9
2M Ω
N3
C6
1 μ F
C7
0.1 μ F
C IN
R ACIN1
N4
R4
200k Ω
D1
ADAPTER
R6
200k Ω
BATT
DCIN
CSSP
CSSN BST
LDO
10k Ω
ACIN
ACOK
DHI
C4
0.68 μ F
N1
C IN = 2 x 4.7 μ F
C OUT = 4.7 μ F
L1 = 2 μ H
R ACIN2
IINP
LX
R1
22.6k Ω
C2
0.1 μ F
DLO
PGND
N2
L1
CSIP
R2
C3
1 μ F
V AA
GND
MAX17005
MAX17006
MAX17015
CSIN
RS2
10m Ω
R3
VCTL
BATT
C OUT
BATTERY
PWM SIGNAL
ISET
CC
R5
3k Ω
R8
R7
C5
0.01 μ F
LDO
C1
ONLY FOR MAX17015
4.7 μ F
Figure 1. Typical Operating Circuit
Detailed Description
The MAX17005/MAX17006/MAX17015 include all the
functions necessary to charge Li+, NiMH, and NiCd
batteries. An all n-channel synchronous-rectified step-
down DC-DC converter is used to implement a preci-
sion constant-current, constant-voltage charger. The
charge current and input current-limit sense amplifiers
have low-input offset errors (250μV typ), allowing the
use of small-valued sense resistors.
The MAX17005/MAX17006/MAX17015 use a new ther-
mally optimized high-frequency architecture. With this
new architecture, the switching frequency is adjusted
to control the power dissipation in the high-side
MOSFET. Benefits of the new architecture include:
reduced output capacitance and inductance, resulting in
smaller printed-circuit board (PCB) area and lower cost.
10
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