RT9991 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – Power Management IC for SSD

RT9991
Power Management IC for SSD
General Description
The RT9991 is a 3-CH PMIC for SSD (Solid-State Drive).
It integrates 3 synchronous buck converters and one
voltage detector.
The RT9991 provides 3 independent enable pins for
sequence control and auto discharge when powered off
on the power line of a NAND Flash.
The frequency can be up to 1.5MHz for Buck 1and Buck
2, and up to 2MHz for Buck 3, hence allowing the use of
smaller sized inductors to meet the space and height limit
in handheld applications.
To maximize power utilization, the RT9991 is designed
with extremely low quiescent current. The buck converter
can consume down to 70μA when operating in standby
mode.
The RT9991 is available in a VQFN-32L 5x5 package.
Ordering Information
RT9991
Package Type
QV : VQFN-32L 5x5 (V-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
RT9991
GQV
YMDNN
RT9991GQV : Product Number
YMDNN : Date Code
Features
z Supply Input Voltage Range : 2.8V to 5.5V
z Buck 1 / Buck 2
` Adjustable Output Voltage for V<sub>CORE</sub> or DRAM
Cache
` Output Current up to 1A
` Switching Frequency : 1.5MHz
z Buck 3
` Adjustable Output Version for NAND Flash
` Output Current up to 3A
` Switching Frequency : 2MHz
` Auto Discharge Function
z Voltage Detector
` Programmable Threshold Voltage
` Open-Drain Reset Output
z RoHS Compliant and Halogen Free
Applications
z 1.8/2.5 inch Solid-State Drives
z Portable Devices
z USB-Based Hand-Held Products
Pin Configurations
(TOP VIEW)
32 31 30 29 28 27 26 25
GND 1
LX3 2
LX3 3
LX3 4
VIN3 5
VIN3 6
EN3 7
FB3 8
GND
24 LX2
23 GND
22 GND
21 VIN2
20 VIN1
19 GND
33 ^{18 GND}
17 LX1
9 10 11 12 13 14 15 16
VQFN-32L 5x5
DS9991-01 April 2011
www.richtek.com
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