参数资料
型号: MAX1845ETX+T
厂商: Maxim Integrated Products
文件页数: 14/27页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 36-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: 540kHz
电源电压: 4.5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 36-WFQFN 裸露焊盘
包装: 带卷 (TR)
Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
V+
TON
ON-TIME
COMPUTE
FROM
OUT
TOFF 1-SHOT
Q TRIG
TRIG
TON
Q
S
R
Q
TO DH DRIVER
1-SHOT
ERROR
FROM
OPPOSITE
PWM
FROM ILIM
COMPARATOR
REF
AMP
FROM ZERO-CROSSING
COMPARATOR
S
R
Q
TO DL DRIVER
SHUTDOWN
OVP
1.14V
0.1V
OUT_
TO
OPPOSITE
PWM
V CC - 1V
R
Q
S
x2
FEEDBACK
MUX
(SEE FIGURE 9)
FB_
0.7V
1.1V
0.9V
UVP
R
Q
S
TIMER
FAULT
TO PGOOD
OR-GATE
Figure 3. PWM Controller (One Side Only)
include larger physical size and degraded load-tran-
sient response (especially at low input voltage levels).
DC output accuracy specifications refer to the threshold
of the error comparator. When the inductor is in continu-
ous conduction, the output voltage will have a DC regula-
tion higher than the trip level by 50% of the ripple. In
discontinuous conduction ( SKIP = GND, light-load), the
output voltage will have a DC regulation higher than the
trip level by approximately 1.5% due to slope compensa-
tion.
Forced-PWM Mode ( SKIP = High)
The low-noise, forced-PWM mode ( SKIP = high) dis-
ables the zero-crossing comparator, which controls the
low-side switch on-time. This causes the low-side gate-
drive waveform to become the complement of the high-
side gate-drive waveform. This in turn causes the
inductor current to reverse at light loads as the PWM
loop strives to maintain a duty ratio of V OUT /V IN . The
benefit of forced-PWM mode is to keep the switching
frequency fairly constant, but it comes at a cost: The
no-load battery current can be 10mA to 40mA, depend-
ing on the external MOSFETs.
Forced-PWM mode is most useful for reducing audio-
frequency noise, improving load-transient response,
providing sink-current capability for dynamic output
voltage adjustment, and improving the cross-regulation
14
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