iD9307
Ultra-Low Noise 800mA LDO Regulator
General Description
Features
The iD9307 is an 800mA fixed output voltage, low

Ultra-Low-Noise application
dropout and low noise linear regulator with high ripple

Wide 2.5V to 7V Operating Range
rejection ratio and fast turn-on time.

Quick Start-Up
It includes a reference voltage source, an error

Eight Fixed Voltage Options Available
amplifier, driver transistors and an internal current

Current Limiting Protection
limiter. The current limiter’s holdback circuit operates

Thermal Shutdown Protection
as a short protection.

High Ripple Rejection 50dB@1kHz
The iD9307 works well with low ESR ceramic

Standby Current Less Than 0.1μA
capacitors, suitable for portable RF and wireless

Auto Discharge
battery-powered applications with stringent space
requirements and demanding performance. It also
Applications
offers ultra low noise output and has low quiescent
current.
Ordering Information
iD9307 - □□ □□□ □
Package

Battery-Powered Equipment

Portable Instruments

Slim DVDs

Digital Camera

WLAN Communication

Hand-Held Instruments
Taping
R: Tape and Reel
A20:SOT-89-3
A21:SOT-89-3
A23:SOT-89-3
A30:SOT-23-3
A50:SOT-23-5
A72:SOT-223-F Type
A74:SOT-223-T Type
S80:SOP-8
Marking Information
For marking information, please contact our sales
representative directly or through an iDesyn distributor
around your location.
Output Voltage Voltage Code
1.0
10
1.2
12
1.5
15
1.8
18
2.5
25
2.6
26
2.8
28
3.3
33
Adjustable
AD
Jul. 2013
1
Rev 1.3
iD9307
Typical Application Circuit
V IN
+
C IN =1μF
V IN
V OUT
iD9307
+
V OUT
C OUT=1μF
GND
Figure 1. Fixed Voltage Version
V IN
V IN
C 1=1μF
V OUT
R1
iD9307
Enable
EN
GND
100K
V OUT
C 2=1μF
ADJ
R2
R1 

VOUT  1.0  1 
 Volts
 R2 
Figure 2. Adjustable Voltage Version
Absolute Maximum Ratings
Supply Voltage VIN
Recommended Operating Conditions
8V
Power Dissipation, PD @ TA=25°C
SOT-89-3
570mW
SOT-223
1050mW
SOT-23-3 & SOT-23-5
400mW
SOP-8
625mW
Input Voltage VIN
2.5V to 7V
EN Input Voltage
0V to 7V
Junction Temperature
Ambient Operating Temperature
-40°C to 125°C
-40°C to 85°C
Thermal Resistance, ja
SOT-89-3
175°C/W
SOT-223
95°C/W
SOT-23-3 & SOT-23-5
250°C/W
SOP-8
160°C/W
Lead Temperature
Storage Temperature
ESD Susceptibility
HBM (Human Body Mode)
MM (Machine Mode)
Jul. 2013
260 °C
-65°C to 150°C
2kV
200V
2
Rev 1.3
iD9307
Electrical Characteristics (Unless otherwise specified VIN=5V, TA=25°C)
Parameters
Symbol
Operating Voltage Range
Shutdown Supply Current
Reference Voltage Tolerance
Supply Current Limit
Quiescent Current
VIN
ISBY
VREF
ILIMIT
IQ
Dropout Voltage (Note 3)
VDROP
Line regulation
ΔVLINE
Load Regulation
Fast Discharge N-MOSFET
Turn On Resistance
ΔVLOAD
Output Noise Voltage
eNO
Thermal Shutdown
Temperature
Thermal Shutdown
Temperature Hysteresis
Power Supply
Rejection Rate
Min
VEN = GND,Shutdown
RLOAD = 1Ω
VEN ≧ 1.2V, IOUT = 0mA
VOUT = 1.0V
VOUT = 1.2V
VOUT = 1.5V
IOUT = 800mA VOUT = 1.8V
VOUT = 2.5V
VOUT = 2.8V
VOUT = 3.3V
VIN = (VOUT +1V) to 6V
IOUT = 1mA
1mA < IOUT < 800mA
0.98
800
VIN = 4V, VEN = 0V
Typ
Max
0.01
1
1000
90
1400
1100
850
650
450
400
300
7
1
1.02
150
2000
1800
1500
1200
800
600
500
Units
V
μA
V
mA
μA
mV
6
mV/V
55
mV
35
10Hz to 100kHz
IOUT = 200mA COUT = 1μF
ΔTSD
VOUT<1.5V, IOUT =1mA
VOUT>1.5V, IOUT =1mA
Logic-Low V
VIL
VIN = 2.5V to 7V,Shutdown
Logic-High V
VIH
VIN = 2.5V to 6V,Start-Up
f = 100Hz
f = 10kHz
PSRR
COUT = 1μF, IOUT = 10mA
Ω
100
TSD
ΔVOUT
Output Voltage Accuracy
EN Threshold
RDISCHARGE
Condition
μVRMS
165
°C
30
°C
-2.5
-2
+2.5
+2
%
0.4
V
1.6
-60
-50
dB
Note 1: Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These
are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated
in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions
for extended periods may remain possibility to affect device reliability.
Note 2: VIN(MIN)=VOUT+VDROPOUT
Note 3: The dropout voltage is defined as (VIN-VOUT) when VOUT is 100mV below the target value of VOUT.
Pin Configurations
SOT-89-3 (A20)
Jul. 2013
(Top View)
SOT-89-3 (A21)
SOT-89-3 (A23)
3
SOT-223 (F Type)
Rev 1.3
iD9307
SOT-223 (T Type)
SOT-23-3
SOT-23-5
SOP-8
Pin Description
Pin Name
EN
Pin Function
Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low
100k resistor connected to GND when the control signal is floating.
GND
Ground
VOUT
Output Voltage
VIN
Input Voltage
ADJ
Adjust Output Voltage
Function Block Diagram
Jul. 2013
4
Rev 1.3
iD9307
Jul. 2013
5
Rev 1.3
iD9307
Typical Operating Characteristics
Current Limit vs. Input Voltage
100
1500
95
1400
Current Limit (mA)
Quiescent Current (A)
Quiescent Current vs. Input Voltage
90
85
80
75
VOUT = 1.2V
70
2.5
3
3.5
4
4.5
5
5.5
1200
1100
1000
VOUT = 1.2V
900
2.5
6
4
4.5
Dropout Voltage vs. Load Current
Line Regulation
5
5.5
1.26
1100
Output Voltage (V)
1000
900
800
700
600
VOUT = 1.2V
200
400
600
Load = 1 mA
Load = 800mA
1.24
0
1.22
1.2
1.18
VIN = 2.5V
VOUT = 1.2V
1.16
800
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Load Current (mA)
Load Regulation
Region of Stable COUT ESR vs. Load Current
1.216
1000
1.211
100
Instable
VIN = 2.5V
1.206
COUT -ESR (Ω)
Output Voltage (V)
3.5
Input Voltage (V)
500
1.201
1.196
1.191
VOUT = 1.2V
1.186
0
10
Stable
1
0.1
0.01
VIN = 5.0V
100 200 300 400 500 600 700 800
CIN = COUT =1F
Instable
0.001
0
Load Current (mA)
Jul. 2013
3
Input Voltage (V)
1200
Dropout Voltage (mV)
1300
200
400
600
800
1000
Load Current (mA)
6
Rev 1.3
iD9307
EN Threshold vs. Temperature
EN Threshold vs. Input Voltage
0.9
1.1
Enable Voltage (V)
Enable Voltage (V)
0.85
VOUT Off to On
1
0.9
0.8
VOUT On to Off
0.7
0.6
ON
0.8
0.75
OFF
0.7
0.65
0.5
-50
-25
0
25
50
75
100
125
0.6
150
3
Temperature (℃)
Jul. 2013
3.5
4
4.5
5
5.5
6
Input Voltage (V)
7
Rev 1.3
iD9307
Line Transient Response
Load Transient Response
CH1: VOUT (AC)
(50mV/Div)
CH1: VIN (DC)
(500mV/Div)
CH2: ILOAD (DC)
(200mA/Div)
CH2: VOUT (AC)
(20mV/Div)
VIN = 3.3V to 4.3V , VOUT=1.2V ILOAD = 100mA
VIN = 3.3V , VOUT=1.2V ILOAD = 1mA to 400mA
Time (1ms/Div)
Time (200us/Div)
Load Transient Response
Load Transient Response
CH1: VOUT (AC)
(50mV/Div)
CH1: VOUT (AC)
(50mV/Div)
CH2 ILOAD (DC)
(500mA/Div)
CH2: ILOAD (DC)
(200mA/Div)
VIN = 3.3V, VOUT=1.2V, ILOAD = 50mA to 800mA
VIN = 2.5V, VOUT=1.2V, ILOAD = 1mA to 400mA
Time (100us/Div)
Time (200us/Div)
Load Transient Response
CH1: VOUT (AC)
(50mV/Div)
CH2 : ILOAD (DC)
(500mA/Div)
VIN = 2.5V, VOUT=1.2V, ILOAD = 50mA to 800mA
Time (250us/Div)
Jul. 2013
8
Rev 1.3
iD9307
Application Information
To assure proper operation, the signal source used to
Capacitor Selection and Regulator
Stability
drive the EN pin must be able to swing above and
Input Capacitor
in the “Electrical Characteristics” under VIH and VIL. The
An input capacitance of 1μF is required between the
ON/OFF signal may come from either CMOS output, or
device input pin and ground directly (the amount of the
an open-collector output with pull-up resistor to the
capacitance may be increased without limit). The input
device input voltage or another logic supply. The high-
capacitor MUST be located less than 1 cm from the
level voltage may exceed the device input voltage, but
device to assure input stability (see PCB Layout
must remain within the absolute maximum ratings for
Section). A lower ESR capacitor allows the use of less
the EN pin.
capacitance, while higher ESR type (like aluminum
Operating Region and Power Dissipation
electrolytic) requires more capacitance. Capacitor
Since the iD9307 is a linear regulator, its power
types (aluminum, ceramic and tantalum) can be mixed
dissipation is always given by P = IOUT (VIN – VOUT).
in parallel, but the total equivalent input
For SOP-8 package the maximum power dissipation is
capacitance/ESR must be defined as above for stable
given by: PD(MAX) = (TJ–TA) /θJA,=(125°C -25°C)/160°C
operation. There are no requirements for the ESR on
/W = 625mW Where (TJ–TA) is the temperature
the input capacitor, but tolerance and temperature
difference the iD9307 die and the ambient air, θJA, is
coefficient must be considered when selecting the
the thermal resistance of the chosen package to the
capacitor to ensure the capacitance is 1 μF over the
ambient air. For surface mount device, heat sinking is
entire operating range.
accomplished by using the heat spreading capabilities
Output Capacitor
of the PC board and its copper traces. In the case of a
The iD9307 is designed specifically to work with very
SOP-8 package, the thermal resistance is typically
small ceramic output capacitors. The minimum
160°C /Watt. Figure 1 is the maximum power
capacitance recommended (temperature
dissipation information of SOT-223, SOT-23-5 and
characteristics of X7R, X5R, Z5U or Y5V) is within the
SOP-8. The die attachment area of the iD9307 lead
1μF to 10μF range with 5mΩ to 50mΩ ESR range
frame is connected to GND pin. Therefore, the GND
ceramic capacitor between LDO output and GND for
pin of iD9307 can dissipate the heat from the die very
transient stability, but it may be increased without limit.
effectively. To improve the maximum power providing
Higher capacitance values help to improve transient
capability, connect the GND pin to ground using a
response. The output capacitor's ESR is critical
large ground plane near the GND pin.
because it forms a zero to provide phase lead which is
Adjustable Operation
required for loop stability.
The adjustable version of the iD9307 has an output
Enable Function
voltage ranging from 1.0V to 5.0V. The output voltage
The iD9307 is shut down by pulling the EN pin low, and
of the iD9307 adjustable regulator is programmed
turned on by driving the input high. If the shutdown
using an external resistor divider as shown in Figure2.
feature is not required, the EN pin should be tied to
The output voltage can be calculated using:
below the specified turn-on/off voltage thresholds listed
VIN to keep the regulator on at all times (the EN pin
MUST NOT be left floating).
Jul. 2013
9
Rev 1.3
iD9307
VIN
VOUT
R1
iD9307
ADJ
R2
EN
GND
R1 

VOUT  1.0  1 

R2 

Figure 2. Output Voltage setting equation
Where:
VREF= 1.0V typ. (the internal reference voltage)
Maximum Power Dissipation (W)
Figure1: Maximum Power Dissipation
1.2
SOT-223
1
SOP-08
0.8
SOT-89
0.6
SOT-23
0.4
0.2
0
-50
-25
0
25
50
75
100
125
Ambient Temperature (℃)
Jul. 2013
10
Rev 1.3
iD9307
Packaging
SOT-89-3
SYMBOLS
A
A1
b
b1
C
D
D1
HE
E
e
H
S
e1
Jul. 2013
DIMENSIONS IN
MILLIMETERS
MIN
NOM
MAX
1.40
1.50
1.60
0.80
1.04--0.36
0.42
0.48
0.41
0.47
0.53
0.38
0.40
0.43
4.40
4.50
4.600
1.40
1.60
1.75
----4.25
2.40
2.50
2.60
2.90
3.00
3.10
0.35
0.40
0.45
0.65
0.75
0.85
1.40
1.50
1.60
11
DIMENSIONS IN INCH
MIN
0.055
0.031
0.014
0.016
0.014
0.173
0.055
--0.094
0.114
0.014
0.026
0.054
NOM
0.059
0.041
0.016
0.18
0.015
0.177
0.062
--0.098
0.118
0.016
0.030
0.059
MAX
0.063
--0.018
0.020
0.017
0.181
0.069
0.167
0.102
0.122
0.018
0.034
0.063
Rev 1.3
iD9307
SOT-223
SYMBOLS
A
A1
B
B1
C
D
E
e
e1
H
L
L2
Jul. 2013
DIMENSIONS IN
MILLIMETERS
MIN
NOM
MAX
1.55
--1.60
0.02
--0.10
0. 60
--0.8
2.90
--3.10
0.24
--0.32
6.30
--6.80
3.30
--3.70
2.30 BSC
4.60 BSC
6.70
7.30
0.90 MIN
0.06 BSC
12
DIMENSIONS IN INCH
MIN
0.061
0.0008
0.024
0.114
0.009
0.248
0.13
NOM
--------------0.090 BSC
0.181 BSC
0.264
MAX
0.071
0.004
0.031
0.122
0.013
0.268
0.146
0.287
0.036 MIN
0.0024 BSC
Rev 1.3
iD9307
SOT-23-3
SYMBOLS
A
A1
A2
b
C
D
E
e
H
L
Θ1
Jul. 2013
DIMENSIONS IN MILLIMETERS
MIN
NOM
MAX
1.00
1.10
1.30
0.00
--0.10
0.70
0.80
0.90
0.35
0.40
0.50
0.10
0.15
0.25
2.70
2.90
3.10
1.40
1.60
1.80
--1.90(TYP)
--2.60
2.80
3.00
0.370
----1°
5°
9°
13
DIMENSIONS IN INCH
MIN
NOM
MAX
0.039
0.043
0.051
0.000
--0.004
0.027
0.031
0.035
0.013
0.016
0.020
0.004
0.006
0.001
0.106
0.114
0.122
0.055
0.063
0.071
--0.075
--0.102
0.110
0.118
0.015
----1°
5°
9°
Rev 1.3
iD9307
SOT-23-5
SYMBOLS
A
A1
A2
b
C
D
E
e
H
L
Θ1
e1
Jul. 2013
DIMENSIONS IN MILLIMETERS
MIN
NOM
MAX
1.00
1.10
1.30
0.00
--0.10
0.70
0.80
0.90
0.35
0.40
0.50
0.10
0.15
0.25
2.70
2.90
3.10
1.50
1.60
1.80
--1.90(TYP)
--2.60
2.80
3.00
0.370
----1°
5°
9°
--0.95(TYP)
---
14
DIMENSIONS IN INCH
MIN
NOM
MAX
0.039
0.043
0.051
0.000
--0.004
0.027
0.031
0.035
0.013
0.016
0.020
0.004
0.006
0.001
0.106
0.114
0.122
0.059
0.063
0.071
--0.075
--0.102
0.110
0.118
0.015
----1°
5°
9°
--0.037
---
Rev 1.3
iD9307
SOP-8
SYMBOLS
A
A1
A2
B
C
D
E
e
H
L
y
θ
Jul. 2013
DIMENSIONS IN
MILLIMETERS
MIN
NOM
MAX
1.35
1.60
1.75
0.10
--0.25
--1.45
--0.33
--0.51
0.19
--0.25
4.80
--5.00
3.80
--4.00
--1.27
--5.80
--6.20
0.40
--1.27
----0.10
0°
--8°
15
DIMENSIONS IN INCH
MIN
0.053
0.004
--0.013
0.007
0.189
0.150
--0.228
0.016
--0°
NOM
0.063
--0.057
--------0.050
---------
MAX
0.069
0.010
--0.020
0.010
0.197
0.157
--0.244
0.050
0.004
8°
Rev 1.3
iD9307
Footprints
SOT-89-3
SOT-223
Jul. 2013
16
Rev 1.3
iD9307
SOT-23-3
Footprint Dimension (mm)
Package
Number of
PIN
P1
P2
A
B
C
D
M
SOT-23-3
3
0.95
1.90
3.60
1.60
1.00
0.80
2.70
Tolerance
±0.10
SOT-23-5
Jul. 2013
17
Rev 1.3
iD9307
SOP-8
Jul. 2013
18
Rev 1.3