NJM2845DL133 (DIGITAL : IC15)
LM1117-N (DIGITAL : IC16, IC18 MAIN : IC53)
Block diagram
RT9702APB (DIGITAL : IC19)
NJM2845/46
- 1 -
Ver.2005-01-20
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
PACKAGE OUTLINE
The NJM2845 is low dropout voltage regulator. Advanced
Bipolar technology achieves low noise, high ripple rejection
and low quiescent current.
NJM2845 is 3 terminal type and NJM2846 is ON/OFF control
built in type. These product can be selected according to the
applications.
FEATURES
z
High Ripple Rejection
75dB typ. (f=1kHz,3V Version)
z
Output Noise Voltage
Vno=45
µ
Vrms typ. (Vo=3V Version)
z
Output capacitor with 2.2
µ
F ceramic capacitor (Vo
≥
2.6V)
z
Output Current
Io(max.)=800mA
z
High Precision Output
Vo
±
1.0%
z
Low Dropout Voltage
0.18V typ. (Io=500mA)
z
ON/OFF Control
(NJM2846)
z
Internal Short Circuit Current Limit
z
Internal Thermal Overload Protection
z
Bipolar Technology
z
Package Outline
TO-252-3 (NJM2845DL1), TO-252-5 (NJM2846DL3)
PIN CONFIGURATION
NJM2845DL1 NJM2846DL3
EQUIVALENT CIRCUIT
V
OUT
Thermal
Protection
Bandgap
Reference
V
IN
GND
V
OUT
Thermal
Protection
Bandgap
Reference
V
IN
Control
GND
1.V
IN
2.GND
3.V
OUT
3
1
2
1.CONTROL
2.V
IN
3.GND
4.Vo
5.NC
NJM2845DL1
NJM2846DL3
NJM2845DL1
NJM2846DL3
1 2 3 4 5
3
3
www.national.com/jpn/
LM1117/LM1117I
ブロック図
ピン配置図
SOT-223
Top View
TO-220
Top View
TO-252
Top View
TO-263
Top View
Side View
LLP
LLP
パッケージを使用する場合は、
2
ピン、
3
ピン、
4
ピンを
互いに接続し、
5
ピン、
6
ピン、
7
ピンを互いに接続してください。
Top View
3
www.national.com/jpn/
LM1117/LM1117I
ブロック図
ピン配置図
SOT-223
Top View
TO-220
Top View
TO-252
Top View
TO-263
Top View
Side View
LLP
LLP
パッケージを使用する場合は、
2
ピン、
3
ピン、
4
ピンを
互いに接続し、
5
ピン、
6
ピン、
7
ピンを互いに接続してください。
Top View
RT9702/A
2
DS9702/A-11 June 2007
www.richtek.com
Function Block Diagram
Functional Pin Description
Pin Name Pin Function
VIN Power Input Voltage
VOUT
Output Voltage
GND Ground
EN
Chip Enable (Active High)
FLG Open-Drain Fault Flag Output
Gate
Control
Output Voltage
Detection
Delay
Oscillator
UVLO
Charge
Pump
Bias
Thermal
Protection
Current
Limiting
FLG
VOUT
VIN
EN
GND
Typical Application Circuit
Note:
A low-ESR 150 F aluminum electrolytic or tantalum between V
OUT
and GND is strongly recommended to meet the
330mV maximum droop requirement in the hub V
BUS
. (see Application Information Section for further details)
VIN
EN
FLG
VOUT
GND
RT9702/A
+
Over -Current
V
BUS
D+
D-
GND
0.1uF
10K
USB Controller
1uF
150uF
10uF
Supply Voltage 5V
Pull-Up Resistor (10K to 100K) (Optional)
Flag Transient Filtering)
Ferrite
Beades
Data
Chip Enable
Pin Configurations
(TOP VIEW)
EN
2
3
5
4
1
GND FLG
VIN
VOUT
SOT-23-5/TSOT-23-5
67
