BD8964FVM-TR Rohm Semiconductor, BD8964FVM-TR Datasheet - Page 7

• Manufacturer Part Number: BD8964FVM-TR
• Description: IC SWITCHING REG W/MOSFET MSOP8
• Manufacturer: Rohm Semiconductor
• Series: -r
• Type: Step-Down (Buck), PWM - Current Moder

Specifications of BD8964FVM-TR

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1 V ~ 1.8 V
• Current - Output: 1.2A
• Frequency - Switching: 1MHz
• Voltage - Input: 4 V ~ 5.5 V
• Operating Temperature: -25°C ~ 85°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

●Description of operations
© 2009 ROHM Co., Ltd. All rights reserved.
BD8964FVM
www.rohm.com
V
V
・Soft-start function
・Shutdown function
・UVLO function
OUT
・Short-current protection circuit with time delay function
EN
CC
EN terminal shifted to “High” activates a soft-starter to gradually establish the output voltage with the current limited during
startup, by which it is possible to prevent an overshoot of output voltage and an inrush current.
With EN terminal shifted to “Low”, the device turns to Standby Mode, and all the function blocks including reference
voltage circuit, internal oscillator and drivers are turned to OFF. Circuit current during standby is 0μF (Typ.).
Detects whether the input voltage sufficient to secure the output voltage of this IC is supplied. And the hysteresis width of
300mV (Typ.) is provided to prevent output chattering.
Turns OFF the output to protect the IC from breakdown when the incorporated current limiter is activated continuously for
at least 1 ms. The output thus held tuned OFF may be recovered by restarting EN or by re-unlocking UVLO.
Standby mode
V
Limit
OUT
EN
I
L
Standby
mode
UVLO
EN
Tss
Fig.23 Short-current protection circuit with time delay timing chart
Operating mode
Soft start
Fig.22 Soft start, Shutdown, UVLO timing chart
Operating mode
Standby
UVLO
mode
7/13
Tss
Hysteresis 100mV
Operating mode
1msec
Timer latch
Standby
Standby
Output OFF
latch
mode
mode
EN
Tss
EN
Operating mode
Operating mode
Technical Note
2009.05 - Rev.A
UVLO
Standby mode