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参数资料
| 型号： | MAX1772EEI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC BAT CHRG BUILD BLCK 28QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 8 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-QSOP |
| 包装： | 带卷 (TR) |
Low-Cost, Multichemistry Battery-
Charger Building Block
30
0
AC ADAPTER
RS1
AC LOAD
20
V DCIN = 16V
V BATT = 8.2V
V DCIN = 16V
V BATT = 12.3V
-1
MAX1772
2A
1A
FREQUENCY
-2
FREQ = 50kHz
10
-3
0
-10
V DCIN = 18V
V BATT = 16.4V
-4
-5
-6
FREQ = 125kHz
FREQ = 250kHz
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
0
10
20
30
40
50
60
70
80
I RS1 (A)
Figure 3. IINP Accuracy vs. V DCIN/ V BATT
Dropout Operation
The MAX1772 has 99.99% duty-cycle capability with a
10ms maximum on-time and 1μs off-time. This allows
the charger to achieve dropout performance limited
only by resistive losses in the DC-DC converter compo-
nents (D1, N1, RS1, RS2) (Figure 1). The actual dropout
voltage is limited to 100mV between CSSP and CSIN by
the power-fail comparator.
Compensation
Each of the three regulation loops—the input current
limit, the charging current limit, and charging voltage
limit—can be compensated separately using the CCS,
CCI, and CCV pins, respectively.
The charge-current-loop error-amp output is brought
out at CCI. Likewise, the source current error-amp out-
put is brought out at CCS; 0.01μF capacitors to ground
at CCI and CCS compensate the current loops in most
charger designs. Raising the value of these capacitors
reduces the bandwidth of these loops.
The voltage-regulating-loop error-amp output is brought
out at CCV. Compensate this loop by connecting a
series RC network from CCV to GND. Recommended
values are 1k Ω and 0.1μF. The zero set by the series
RC increases midfrequency gain to provide phase
compensation. The pole at CCV is set by the capacitor
and the voltage error-amp output impedance at low fre-
quencies to integrate the DC error.
DUTY CYCLE (%)
Figure 4. IINP Accuracy vs. AC Load Duty Cycle
MOSFETs and Schottky Diodes
Schottky diode D1 provides power to the load when the
AC adapter is inserted. This diode must be able to
deliver the maximum current as set by RS1.
The n-channel MOSFETs (N1, N2) are the switching
devices for the buck controller. High-side switch N1
should have a current rating of at least 8A and have an
on-resistance (R DS(ON) ) of 50m Ω or less. The driver for
N1 is powered by BST; its current should be less than
10mA. Select a MOSFET with a low total gate charge
(Q GATE ) and determine the required drive current by
I GATE = Q GATE f (where f is the DC-DC converter’s
400kHz maximum switching frequency).
The low-side switch (N2) should also have a current rat-
ing of at least 8A, have an R DS(ON) of 100m Ω or less,
and a total gate charge less than 10nC. N2 is used to
provide the starting charge to the BST capacitor (C15).
During normal operation, the current is carried by
Schottky diode D2. Choose a Schottky diode capable
of carrying the maximum charging current.
D3 is a signal-level diode, such as the 1N4148. This
diode provides the supply current to the high-side
MOSFET driver.
Inductor Selection
Inductor L1 provides power to the battery while it is
being charged. It must have a saturation current of at
least 4A plus 1/2 of the current ripple ( Δ I L ):
Component Selection
Table 2 lists the recommended components and refers
to the circuit of Figure 1. The following sections describe
how to select these components.
I SAT = 4A + (1/2) Δ I L
(8)
16
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