RT2516 Datasheet, PDF (2/9 Pages) Richtek Technology Corporation – 2A, Low Input Voltage, Ultra-Low Dropout LDO Regulator with Enable

RT2516
Typical Application Circuit
V_IN
Chip Enable
RT2516
3 _VIN
C1
10µF
2
EN
VOUT ⁶
ADJ ⁷
V_OUT
R1
C2
10µF
R2
V_OUT
=
0.5(R1+R2)
R2
(V)
GND
8,
9 (Exposed Pad)
Figure 1. Adjustable Voltage Regulator
Functional Pin Description
Pin No.
Pin Name
Pin Function
1, 4, 5
NC
2
EN
3
VIN
6
VOUT
7
ADJ
8,
9 (Exposed pad)
GND
No Internal Connection.
Chip Enable (Active-High). Pulling this pin below 0.4V turns the regulator off,
reducing the quiescent current to a fraction of its operating value. The device will
be enabled if this pin is left open. Connect to VIN if not being used.
Input voltage. For regulation at full load, the input to this pin must be between
(V_OUT + 0.5V) and 6V. Minimum input voltage is 1.4V. A large bulk capacitance
should be placed closely to this pin to ensure that the input supply does not sag
below 1.4V. Also a minimum of 10μF ceramic capacitor should be placed directly at
this pin.
Output Voltage. A minimum of 10μF capacitor should be placed directly at this pin.
If connected to the VOUT pin, the output voltage will be set at 0.5V. If external
feedback resistors are used, the output voltage will be determined by the resistor
ratio.
Ground. The exposed pad must be soldered to a large PCB and connected to GND
for maximum power dissipation.
Function Block Diagram
R_SENSE
VIN
V_PUMP
-
+
V_IN
0.5µA
EN
Thermal
Shutdown
V_OUT
V_IN
+
- _{Reverse Voltage}
Shutdown
-
+
0.5V
V_IN
Reference
Generator
VOUT
ADJ
GND
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2516-01 July 2012