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| 型号： | MAX1541ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/49页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR DIVIDER PWM 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 620kHz |
| 占空比： | 100% |
| 电源电压： | 2 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 是 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
Pin Description (continued)
MAX1540A
PIN
MAX1541
NAME
FUNCTION
Open-Drain Power-Good Output. PGOOD2 is low when the output voltage is more
13
17
PGOOD2
than 10% (typ) above or below the normal regulation point, during soft-start, and in
shutdown. After the soft-start circuit has terminated, PGOOD2 becomes high
impedance if the output is in regulation.
14
15
18
19
DH2
LX2
High-Side Gate-Driver Output for Controller 2. DH2 swings from LX2 to BST2.
Inductor Connection for Controller 2. Connect to the switched side of the inductor.
LX2 serves as the lower supply rail for the DH2 high-side gate driver.
Boost Flying-Capacitor Connection for Controller 2. Connect to an external capacitor
16
20
BST2
and diode as shown in Figure 8. An optional resistor in series with BST2 allows the
DH2 pullup current to be adjusted.
17
18
21
22
GND
DL2
Analog and Power Ground. Connect backside pad to GND.
Low-Side Gate-Driver Output for Controller 2. DL2 swings from GND to LDOOUT
(MAX1540A) or GND to V DD (MAX1541).
Battery Voltage Input. The controller uses V+ to set the on-time one-shot timing. The
19
23
V+
DH on-time is inversely proportional to input voltage over a range of 2V to 28V. For
the MAX1540A, V+ also serves as the linear-regulator input supply.
Internal Linear-Regulator Input Supply. Power LDOIN from a 4.5V to 28V voltage
—
24
LDOIN
source. Bypass LDOIN to GND with a 4.7μF or greater capacitor. For the MAX1540A,
LDOIN is internally connected to V+. For the MAX1541, LDOIN must be connected to
V DD when LDO is not used.
MAX1541 Supply Voltage Input for the DL_ Gate Driver. Connect to the system
—
25
V DD
supply voltage (+4.5V to +5.5V). Bypass V DD to power ground with a 1μF or greater
ceramic capacitor. For the MAX1540A, LDOOUT supplies the DL_ gate drivers
(V DD = LDOOUT).
Linear Regulator Output. Bypass LDOOUT with a 1μF or greater capacitor per 5mA of
20
26
LDOOUT
load (internal and external), with a minimum of 4.7μF. For the MAX1540A, LDOOUT
powers the DL_ gate drivers (V DD internally connected to LDOOUT).
Feedback Input for the Linear Regulator. Connect to GND for a fixed 5V output. For
an adjustable output (1.25V to V LDOIN - 0.6V), connect FBLDO to a resistive voltage-
—
27
FBLDO
divider from LDOOUT to analog ground (GND). The FBLDO regulation voltage is
+1.25V. For the MAX1540A, FBLDO is internally connected to GND for a fixed 5V
output.
21
22
28
29
DL1
LDOON
Low-Side Gate-Driver Output for Controller 1. DL1 swings from GND to LDOOUT
(MAX1540A) or GND to V DD (MAX1541).
Linear-Regulator Enable Input. For automatic startup, connect to V+ or LDOIN
(MAX1541). Connect to GND to shut down the linear regulator.
Boost Flying-Capacitor Connection for Controller 1. Connect to an external capacitor
23
30
BST1
and diode as shown in Figure 8. An optional resistor in series with BST1 allows the
DH1 pullup current to be adjusted.
18
______________________________________________________________________________________
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