参数资料
| 型号： | BD91361MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 9/23页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 20VQFN |
| 特色产品： | BD91x Series Step-Down Regulators |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 3.3 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 20-VQFN |
| 其它名称： | BD91361MUV-E2DKR |
BD91361MUV
Datasheet
? SLLM
(Simple Light Load Mode) control
Application Information
● Operation
BD91361MUV is a synchronous rectifying step-down switching regulator that achieves faster transient response by
employing current mode PWM control system. It utilizes switching operation in PWM (Pulse Width Modulation) mode for
heavier load, while it utilizes SLLM (Simple Light Load Mode) operation for lighter load to improve efficiency.
○ Synchronous rectifier
It does not require the power to be dissipated by a rectifier externally connected to a conventional DC/DC converter IC,
and its P.N junction shoot-through protection circuit limits the shoot-through current during operation, by which the power
dissipation of the set is reduced.
○ Current mode PWM control
Synthesizes a PWM control signal with a inductor current feedback loop added to the voltage feedback.
? PWM (Pulse Width Modulation) control
The oscillation frequency for PWM is 1 MHz. SET signal form OSC turns ON a highside MOS FET (while a lowside
MOS FET is turned OFF), and an inductor current I L increases. The current comparator (Current Comp) receives two
signals, a current feedback control signal (SENSE: Voltage converted from I L ) and a voltage feedback control signal
(FB), and issues a RESET signal if both input signals are identical to each other, and turns OFF the highside MOS FET
(while a lowside MOS FET is turned ON) for the rest of the fixed period. The PWM control repeat this operation.
TM
When the control mode is shifted from PWM for heavier load to the one for lighter load or vise versa, the switching
pulse is designed to turn OFF with the device held operated in normal PWM control loop, which allows linear operation
without voltage drop or deterioration in transient response during the mode switching from light load to heavy load or
vise versa.
Although the PWM control loop continues to operate with a SET signal from OSC and a RESET signal from Current
Comp, it is so designed that the RESET signal is held issued if shifted to the light load mode, with which the switching
is tuned OFF and the switching pulses are thinned out under control. Activating the switching intermittently reduces
the switching dissipation and improves the efficiency.
SENSE
V OUT
Level
Shift FB
Gm Amp.
ITH
Current
Comp
RESET
SET
OSC
R Q
S
Driver
Logic
SW
I L
Load
V OUT
Fig.21 Diagram of current mode PWM control
Current
Comp
SET
RESET
SW
PVCC
GND
GND
GND
SENSE
FB
Current
Comp
SET
RESET
SW
PVCC
SENSE
FB
GND
GND
I L
V OUT
I L (AVE)
V OUT (AVE)
I L
V OUT
GND
0A
V OUT (AVE)
Not switching
Fig.23 SLLM
Fig.22 PWM switching timing chart
TM
switching timing chart
www.rohm.com
?2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
9/21
TSZ02201-0J3J0AJ00200-1-2
02.MAR.2012 Rev.001
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