ISL9012IRNNZ [INTERSIL]
Dual LDO with Low Noise, Low IQ, and High PSRR; 双路LDO具有低噪声,低智商,和高PSRR型号: | ISL9012IRNNZ |
厂家: | Intersil |
描述: | Dual LDO with Low Noise, Low IQ, and High PSRR |
文件: | 总11页 (文件大小:226K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
ISL9012
®
Data Sheet
May 8, 2006
FN9220.2
Dual LDO with Low Noise, Low I , and
Q
Features
High PSRR
• Integrates two high performance LDOs
- VO1 - 150mA output
ISL9012 is a high performance dual LDO capable of
sourcing 150mA current from channel 1 and 300mA from
channel 2. The device has a low standby current and high-
PSRR and is stable with output capacitance of 1μF to 10μF
with ESR of up to 200mΩ.
- VO2 - 300mA output
• Excellent transient response to large current steps
• Excellent load regulation:
• <1% voltage change across full range of load current
• High PSRR: 70dB @ 1kHz
The device integrates a Power-On-Reset (POR) function for
the VO2 output. The POR delay for VO2 can be externally
programmed by connecting a timing capacitor to the CPOR
pin. A reference bypass pin is also provided for connecting a
noise-filtering capacitor for low noise and high PSRR
applications.
• Wide input voltage capability: 2.3V - 6.5V
• Extremely low quiescent current: 45μA (both LDOs on)
• Low dropout voltage: typically 120mV @ 150mA
• Low output noise: typically 30μVrms @ 100μA(1.5V)
• Stable with 1-10μF ceramic capacitors
The quiescent current is typically only 45μA with both LDO’s
enabled and active. Separate enable pins control each
individual LDO output. When both enable pins are low, the
device is in shutdown, typically drawing less than 0.1μA.
• Separate enable pins for each LDO
Several combinations of voltage outputs are standard.
Others are available on request. Output voltage options for
each LDO range from 1.2V to 3.6V.
• POR output, with adjustable delay time indicates when the
VO2 output is good
• Soft-start to limit input current surge during enable
• Current limit and overheat protection
Pinout
ISL9012
10 LD 3X3 DFN
TOP VIEW
• ±1.8% accuracy over all operating conditions
• Tiny 10 Ld 3x3mm DFN package
• -40°C to +85°C operating temperature range
• Pin compatible with Micrel MIC2212
VIN
EN1
VO1
VO2
POR
NC
1
2
3
4
5
10
9
• Pb-free plus anneal available (RoHS compliant)
EN2
8
CBYP
CPOR
7
Applications
GND
6
• PDAs, Cell Phones and Smart Phones
• Portable Instruments, MP3 Players
• Handheld Devices including Medical Handhelds
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2005, 2006. All Rights Reserved.
1
All other trademarks mentioned are the property of their respective owners.
ISL9012
Ordering Information
PART NUMBER
VO1 VOLTAGE VO2 VOLTAGE
PACKAGE
(Pb-free)
(Notes 1, 2, 3)
ISL9012IRNNZ
ISL9012IRNJZ
ISL9012IRNFZ
ISL9012IRMNZ
ISL9012IRMMZ
ISL9012IRMGZ
ISL9012IRLLZ
ISL9012IRKKZ
ISL9012IRKJZ
ISL9012IRKFZ
ISL9012IRKCZ
ISL9012IRJNZ
ISL9012IRJMZ
ISL9012IRJRZ
ISL9012IRJCZ
ISL9012IRJBZ
ISL9012IRGCZ
ISL9012IRFJZ
ISL9012IRFDZ
ISL9012IRFCZ
ISL9012IRPLZ
ISL9012IRCJZ
ISL9012IRCCZ
ISL9012IRBJZ
NOTES:
PART MARKING
(V)
3.3
3.3
3.3
3.0
3.0
3.0
2.9
2.85
2.85
2.85
2.85
2.8
2.8
2.8
2.8
2.8
2.7
2.5
2.5
2.5
1.85
1.8
1.8
1.5
(V)
3.3
2.8
2.5
3.3
3.0
2.7
2.9
2.85
2.8
2.5
1.8
3.3
3.0
2.6
1.8
1.5
1.8
2.8
2.0
2.0
2.9
2.8
1.8
2.8
TEMP RANGE (°C)
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
PKG. DWG. #
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
L10.3x3C
DCTA
DAPA
DARA
DCYA
DAAK
DCBC
DAAJ
DASA
DATA
DAVA
DAAB
DCBD
DAAH
DAAG
DAAF
DAWA
DAAE
DAYA
DCBK
DCBL
DAAD
DCBN
DCBP
DAAC
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
10 Ld 3x3 DFN
1. Add -T to part number for tape and reel.
2. For other output voltages, contact Intersil Marketing.
3. Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are
MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
FN9220.2
May 8, 2006
2
ISL9012
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7.1V
Thermal Resistance (Notes 1, 2)
θ
(°C/W)
50
θ
(°C/W)
10
JA
JC
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V +0.3)V
IN
3x3 DFN Package . . . . . . . . . . . . . . . .
Junction Temperature Range . . . . . . . . . . . . . . . . .-40°C to +125°C
Operating Temperature Range . . . . . . . . . . . . . . . . .-40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300°C
Recommended Operating Conditions
Ambient Temperature Range (T ) . . . . . . . . . . . . . . .-40°C to +85°C
A
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 to 6.5V
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. θ is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
JA
Tech Brief TB379.
2. θ , “case temperature” location is at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
JC
Electrical Specifications Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature
range of the device as follows:
T
= -40°C to +85°C; V = (V +0.5V) to 6.5V with a minimum V of 2.3V; C = 1μF; C = 1μF;
A
IN
O
IN
IN
O
C
= 0.01μF; C
= 0.01μF
BYP
POR
PARAMETER
DC CHARACTERISTICS
Supply Voltage
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNITS
V
2.3
6.5
V
IN
Ground Current
Quiescent condition: I = 0μA; I = 0μA
O1 O2
I
One LDO active
Both LDO active
@25°C
25
45
40
60
μA
μA
μA
V
DD1
DD2
DDS
I
Shutdown Current
UVLO Threshold
I
0.1
2.1
1.8
1.0
2.3
2.0
+1.8
V
1.9
1.6
UV+
V
V
UV-
Regulation Voltage Accuracy
Variation from nominal voltage output, V = V +0.5 to 5.5V,
IN
-1.8
%
O
T = -40°C to 125°C
J
Line Regulation
Load Regulation
V
= (V
+ 1.0V relative to highest output voltage) to 5.5V
OUT
-0.2
0
0.2
0.7
1.0
%/V
%
IN
I
I
= 100μA to 150mA (VO1 and VO2)
= 100μA to 300mA (VO2)
0.1
OUT
OUT
%
Maximum Output Current
I
VO1: Continuous
VO2: Continuous
150
300
350
mA
mA
mA
mV
mV
mV
mV
°C
MAX
Internal Current Limit
I
V
V
V
V
T
475
125
300
250
200
145
110
600
200
500
400
325
LIM
Dropout Voltage (Note 4)
I
I
I
I
= 150mA; V > 2.1V (VO1)
O
DO1
DO2
DO3
DO4
SD+
O
O
O
O
= 300mA; V < 2.5V (VO2)
O
= 300mA; 2.5V ≤ V ≤ 2.8V (VO2)
O
= 300mA; V > 2.8V (VO2)
O
Thermal Shutdown Temperature
T
°C
SD-
AC CHARACTERISTICS
Ripple Rejection
I
= 10mA, V = 2.8V(min), V = 1.8V, C = 0.1μF
IN BYP
O
O
@ 1kHz
70
55
40
30
dB
dB
@ 10kHz
@ 100kHz
dB
Output Noise Voltage
I
= 100μA, V = 1.5V, T = 25°C, C = 0.1μF
BYP
μVrms
O
O
A
BW = 10Hz to 100kHz (Note 3)
FN9220.2
May 8, 2006
3
ISL9012
Electrical Specifications Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature
range of the device as follows:
T
= -40°C to +85°C; V = (V +0.5V) to 6.5V with a minimum V of 2.3V; C = 1μF; C = 1μF;
A
IN
O
IN
IN
O
C
= 0.01μF; C
= 0.01μF (Continued)
BYP
SYMBOL
DEVICE START-UP CHARACTERISTICS
POR
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
Device Enable TIme
T
Time from assertion of the ENx pin to when the output voltage
reaches 95% of the VO(nom)
250
30
500
60
μs
EN
LDO Soft-start Ramp Rate
T
Slope of linear portion of LDO output voltage ramp during start-
up
μs/V
SSR
EN1, EN2 PIN CHARACTERISTICS
Input Low Voltage
V
-0.3
1.4
0.5
V
V
IL
Input High Voltage
V
V +0.3
IN
IH
Input Leakage Current
Pin Capacitance
I , I
IL IH
0.1
μA
pF
C
Informative
5
PIN
POR PIN CHARACTERISTICS
POR Thresholds
V
As a percentage of nominal output voltage
CPOR = 0.01μF
91
87
94
90
97
93
%
%
POR+
V
POR-
POR Delay
T
100
200
25
300
ms
μs
V
PLH
PHL
T
POR Pin Output Low Voltage
V
@I = 1.0mA
OL
0.2
OL
POR Pin Internal Pull-Up
Resistance
R
78
100
180
kΩ
POR
NOTES:
3. Guaranteed by design and characterization.
4. VOx = 0.98 * VOx(NOM); Valid for VOx greater than 1.85V.
EN2
T
EN
V
POR+
V
POR+
V
V
POR-
POR-
<t
PHL
VO2
POR
t
t
PLH
PHL
FIGURE 1. TIMING PARAMETER DEFINITION
FN9220.2
May 8, 2006
4
ISL9012
Typical Performance Curves
0.10
0.08
0.06
0.04
0.02
0.00
-0.02
-0.04
-0.06
-0.08
-0.10
0.8
0.6
0.4
VIN = 3.8V
VO = 3.3V
VO = 3.3V
= 0mA
I
LOAD
0.2
-40°C
-40°C
25°C
0.0
25°C
-0.2
85°C
-0.4
-0.6
-0.8
85°C
0
50
100
150
200
250
300
350
400
3.4
3.8
4.2
4.6
5.0
5.4
5.8
6.2
6.6
LOAD CURRENT - I (mA)
O
INPUT VOLTAGE (V)
FIGURE 2. OUTPUT VOLTAGE vs INPUT VOLTAGE (3.3V
OUTPUT)
FIGURE 3. OUTPUT VOLTAGE CHANGE vs LOAD CURRENT
3.4
0.10
VIN = 3.8V
VO = 3.3V
VO1 = 3.3V
0.08
I
= 0mA
O
3.3
3.2
3.1
3.0
2.9
2.8
I
= 0mA
LOAD
0.06
0.04
0.02
0.00
-0.02
-0.04
-0.06
I
= 150mA
O
-0.08
-0.10
3.1
3.6
4.1
4.6
5.1
5.6
6.1
6.5
-40 -25 -10
5
20 35 50 65 80 95 110 125
INPUT VOLTAGE (V)
TEMPERATURE (°C)
FIGURE 4. OUTPUT VOLTAGE CHANGE vs TEMPERATURE
FIGURE 5. OUTPUT VOLTAGE vs INPUT VOLTAGE
(VO1 = 3.3V)
2.9
350
300
VO2 = 2.8V
I
= 0mA
O
2.8
2.7
2.6
2.5
2.4
2.3
250
VO2 = 2.8V
I
= 150mA
O
200
150
100
I
= 300mA
O
VO1 = 3.3V
50
0
2.6
3.1
3.6
4.1
4.6
5.1
5.6
6.1 6.5
0
50
100
150
200
250
300
350
400
INPUT VOLTAGE (V)
OUTPUT LOAD (mA)
FIGURE 6. OUTPUT VOLTAGE vs INPUT VOLTAGE
(VO2 = 2.8V)
FIGURE 7. VO1 DROPOUT VOLTAGE vs LOAD CURRENT
FN9220.2
May 8, 2006
5
ISL9012
Typical Performance Curves (Continued)
55
50
45
40
35
30
25
175
VO1 = 3.3V
150
125
125°C
25°C
85°C
25°C
-40°C
100
75
50
25
0
-40°C
VO1 = 3.3V
VO2 = 2.8V
I
(BOTH CHANNELS) = 0µA
O
3.0
3.5
4.0
4.58
5.0
5.5
6.0
6.5
0
25
50
75
100
125
150
175
200
OUTPUT LOAD (mA)
INPUT VOLTAGE (V)
FIGURE 8. VO1 DROPOUT VOLTAGE vs LOAD CURRENT
FIGURE 9. GROUND CURRENT vs INPUT VOLTAGE
55
50
45
40
200
180
160
140
25°C
85°C
120
-40°C
100
80
35
60
VIN = 3.8V
40
VIN = 3.8V
VO1 = 3.3V
VO2 = 2.8V
VO = 3.3V
= 0µA
30
I
20
LOAD
BOTH OUTPUTS ON
0
25
0
50
100
150
200
250
300
350
400
-40 -25 -10
5
20 35 50 65 80 95 110 125
LOAD CURRENT (mA)
TEMPERATURE (°C)
FIGURE 10. GROUND CURRENT vs LOAD
FIGURE 11. GROUND CURRENT vs TEMPERATURE
3.5
VO1 = 3.3V
VO2 = 2.8V
VO1 = 3.3V
VO2 = 2.8V
I 1 = 150mA
L
5
4
3
2
1
0
3.0
2.5
2.0
1.5
1.0
0.5
0
I 1 = 150mA
L
I 2 = 300mA
L
VIN
VO1
I 2 = 300mA
L
POR
CPOR = 0.1µF
VO-1
VO-2
VO2
0
1
2
3
4
5
6
7
8
9
10
0
0.5
1.0
1.5
2.0
2.5
TIME (s)
3.0
3.5
4.0
4.5
5.0
TIME (s)
FIGURE 13. POWER-UP/POWER-DOWN WITH POR SIGNALS
FIGURE 12. POWER-UP/POWER-DOWN
FN9220.2
May 8, 2006
6
ISL9012
Typical Performance Curves (Continued)
VO2 (10mV/DIV)
VO = 3.3V
= 150mA
I
LOAD
C
C
= 1μF
LOAD
= 0.01μF
BYP
VIN = 5.0V
VO1 = 3.3V
VO2 = 2.8V
3
2
1
0
5
0
4.3V
3.6V
I 1 = 150mA
L
I 2 = 300mA
L
C 1, C 2 = 1µF
L
L
C
= 0.01µF
BYP
10mV/DIV
0
100 200 300 400 500 600 700 800 900 1000
TIME (µs)
400μs/DIV
FIGURE 14. TURN ON/TURN OFF RESPONSE
FIGURE 15. LINE TRANSIENT RESPONSE, 3.3V OUTPUT
VO = 2.8V
I
= 300mA
LOAD
C
C
= 1μF
LOAD
= 0.01μF
VO (25mV/DIV)
BYP
4.2V
3.5V
VO = 1.8V
VIN = 2.8V
300mA
10mV/DIV
I
LOAD
100μA
100μs/DIV
400μs/DIV
FIGURE 17. LOAD TRANSIENT RESPONSE
FIGURE 16. LINE TRANSIENT RESPONSE, 2.8V OUTPUT
100
1000
100
10
VIN = 3.6V
90
80
70
60
50
40
30
20
10
0
VO = 1.8V
= 10mA
I
O
C
C
= 0.01μF
BYP
= 1μF
LOAD
VIN = 3.6V
VO = 1.8V
I
= 10mA
LOAD
C
C
C
= 0.01μF
BYP
1
= 1μF
IN
= 1μF
LOAD
0.1
10
0.1
1
10
100
1000
100
1K
10K
100K
1M
FREQUENCY (kHz)
FREQUENCY (Hz)
FIGURE 18. PSRR vs FREQUENCY
FIGURE 19. SPECTRAL NOISE DENSITY vs FREQUENCY
FN9220.2
May 8, 2006
7
ISL9012
Pin Description
PIN
PIN #
NAME
TYPE
DESCRIPTION
1
VIN
Analog I/O
Supply Voltage/LDO Input:
Connect a 1μF capacitor to GND.
2
3
4
EN1
EN2
Low Voltage Compatible
CMOS Input
LDO-1 Enable.
Low Voltage Compatible
CMOS Input
LDO-2 Enable.
CBYP
Analog I/O
Reference Bypass Capacitor Pin:
Optionally connect capacitor of value 0.01μF to 1μF between this pin and GND to tune in the
desired noise and PSRR performance.
5
CPOR
Analog I/O
POR Delay Setting Capacitor Pin:
Connect a capacitor between this pin and GND to delay the POR output release after LDO-2
output reaches 94% of its specified voltage level (200ms delay per 0.01μF).
6
7
8
9
GND
NC
Ground
NC
GND is the connection to system ground. Connect to PCB Ground plane.
No Connection.
POR
VO2
Open Drain Output (1mA) Open-drain POR Output for LDO-2 (active-low).
Analog I/O
LDO-2 Output:
Connect capacitor of value 1μF to 10μF to GND (1µF recommended).
10
VO1
Analog I/O
LDO-1 Output:
Connect capacitor of value 1μF to 10μF to GND (1µF recommended).
Typical Application
R1
ISL9012
10
9
1
2
VIN (2.3-6.5V)
ON
Vout 1
Vout 2
VIN
VO1
VO2
EN1
Enable 1
ON
Vout 2 OK
OFF
8
7
3
4
EN2
POR
NC
RESET
(200ms delay, C3 = 0.01µF)
Enable 2
OFF
Vout2 too low
CBYP
6
5
CPOR
GND
C1
C2
C3
C4
C5
C1, C4, C5: 1μF X5R ceramic capacitor
C2: 0.01μF X5R ceramic capacitor
C3: 0.01μF X5R ceramic capacitor
R1: 100kΩ resistor, 5%
FN9220.2
May 8, 2006
8
ISL9012
Block Diagram
VIN
IS2
LDO
VREF
TRIM
ERROR
1V
VO1
VO2
VO2
AMPLIFIER
QEN2
~1.0V
POR
COMPARATOR
VOK2
POR
LDO-2
LDO-1
EN1
EN2
POR
CONTROL
LOGIC
POR
DELAY
VOK2
1.00V
BANDGAP AND
TEMPERATURE
SENSOR
VOLTAGE
REFERENCE
GENERATOR
0.94V
0.90V
UVLO
GND
CBYP
CPOR
mode. During this condition, all on-chip circuits are off, and
the device draws minimum current, typically less than 0.1μA.
When one or both of the enable pins are asserted, the
device first polls the output of the UVLO detector to ensure
that VIN voltage is at least about 2.1V. Once verified, the
device initiates a start-up sequence. During the start-up
sequence, trim settings are first read and latched. Then,
sequentially, the bandgap, reference voltage and current
generation circuitry power up. Once the references are
stable, a fast-start circuit quickly charges the external
reference bypass capacitor (connected to the CBYP pin) to
the proper operating voltage. After the bypass capacitor has
been charged, the LDO’s power up.
Functional Description
The ISL9012 contains all circuitry required to implement two
high performance LDO’s. High performance is achieved
through a circuit that delivers fast transient response to
varying load conditions. In a quiescent condition, the
ISL9012 adjusts its biasing to achieve the lowest standby
current consumption.
The device also integrates current limit protection, smart
thermal shutdown protection, staged turn-on and soft-start.
Smart Thermal shutdown protects the device against
overheating. Staged turn-on and soft-start minimize start-up
input current surges without causing excessive device turn-
on time.
If EN1 is brought high, and EN2 goes high before the VO1
output stabilizes, the ISL9012 delays the VO2 turn-on until
the VO1 output reaches its target level.
Power Control
The ISL9012 has two separate enable pins, EN1 and EN2,
to individually control power to each of the LDO outputs.
When both EN1 and EN2 are low, the device is in shutdown
If EN2 is brought high, and EN1 goes high before VO2 starts
its output ramp, then VO1 turns on first and the ISL9012
FN9220.2
May 8, 2006
9
ISL9012
delays the VO2 turn-on until the VO1 output reaches its
target level.
one of the following output voltages: 1.5V, 1.8V, 1.85, 2.5V,
2.6, 2.7, 2.8V, 2.85V, 2.9, 3.0, and 3.3V.
If EN2 is brought high, and EN1 goes high after VO2 starts
its output ramp, then the ISL9012 immediately starts to ramp
up the VO1 output.
Power-On Reset Generation
LDO-2 has a Power-on Reset signal generation circuit which
outputs to the POR pin. The POR signal is generated as
follows:
If both EN1 and EN2 are high, the VO1 output has priority,
and is always powered up first.
A POR comparator continuously monitors the voltage of the
LDO-2 output. The LDO enters a power-good state when the
output voltage is above 94% of the expected output voltage
for a period exceeding the LDO PGOOD entry delay time. In
the power-good state, the open-drain POR output is in a
high-impedance state. An external resistor can be added
between the POR output and either LDO output or the input
voltage, VIN.
During operation, whenever the VIN voltage drops below
about 1.8V, the ISL9012 immediately disables both LDO
outputs. When VIN rises back above 2.1V, the device re-
initiates its start-up sequence and LDO operation will
resume automatically.
Reference Generation
The reference generation circuitry includes a trimmed
bandgap, a trimmed voltage reference divider, a trimmed
current reference generator, and an RC noise filter. The filter
includes the external capacitor connected to the CBYP pin.
A 0.01μF capacitor connected CBYP implements a 100Hz
lowpass filter, and is recommended for most high
performance applications. For the lowest noise application, a
0.1μF or greater CBYP capacitor should be used. This filters
the reference noise to below the 10Hz – 1kHz frequency
band, which is crucial in many noise-sensitive applications.
The power-good state is exited when the LDO-2 output falls
below 90% of the expected output voltage for a period longer
than the PGOOD exit delay time. While power-good is false,
the ISL9012 pulls the respective POR pin low.
The PGOOD entry and exit delays are determined by the
value of the external capacitor connected to the CPOR pin.
For a 0.01μF capacitor, the entry and exit delays are 200ms
and 25μs respectively. Larger or smaller capacitor values will
yield proportionately longer or shorter delay times. The POR
exit delay should never be allowed to be less than 10μs to
ensure sufficient immunity against transient induced false
POR triggering.
The bandgap generates a zero temperature coefficient (TC)
voltage for the reference divider. The reference divider
provides the regulation reference, POR detection thresholds,
and other voltage references required for current generation
and over-temperature detection.
Overheat Detection
The bandgap outputs a proportional-to-temperature current
that is indicative of the temperature of the silicon. This
current is compared with references to determine if the
device is in danger of damage due to overheating. When the
die temperature reaches about 145°C, one or both of the
LDO’s momentarily shut down until the die cools sufficiently.
In the overheat condition, only the LDO sourcing more than
50mA will be shut off. This does not affect the operation of
the other LDO. If both LDOs source more than 50mA and an
overheat condition occurs, both LDO outputs are disabled.
Once the die temperature falls back below about 110°C, the
disabled LDO(s) are re-enabled and soft-start automatically
takes place.
The current generator outputs references required for
adaptive biasing as well as references for LDO output
current limit and thermal shutdown determination.
LDO Regulation and Programmable Output Divider
The LDO Regulator is implemented with a high-gain
operational amplifier driving a PMOS pass transistor. The
design of the ISL9012 provides a regulator that has low
quiescent current, fast transient response, and overall
stability across all operating and load current conditions.
LDO stability is guaranteed for a 1μF to 10μF output
capacitor that has a tolerance better than 20% and ESR less
than 200mΩ. The design is performance-optimized for a 1μF
capacitor. Unless limited by the application, use of an output
capacitor value above 4.7μF is not recommended as LDO
performance improvement is minimal.
Soft-start circuitry integrated into each LDO limits the initial
ramp-up rate to about 30μs/V to minimize current surge. The
ISL9012 provides short-circuit protection by limiting the
output current to about 475mA.
Each LDO uses an independently trimmed 1V reference. An
internal resistor divider drops the LDO output voltage down
to 1V. This is compared to the 1V reference for regulation.
The resistor division ratio is programmed in the factory to
FN9220.2
May 8, 2006
10
ISL9012
Dual Flat No-Lead Plastic Package (DFN)
L10.3x3C
2X
0.10 C
A
10 LEAD DUAL FLAT NO-LEAD PLASTIC PACKAGE
A
D
MILLIMETERS
2X
0.10
C B
SYMBOL
MIN
0.85
-
NOMINAL
0.90
MAX
0.95
0.05
NOTES
A
A1
A3
b
-
-
-
E
0.20 REF
0.25
-
6
INDEX
AREA
0.20
2.33
1.59
0.30
2.43
1.69
5, 8
D
3.00 BSC
2.38
-
TOP VIEW
B
A
D2
E
7, 8
3.00 BSC
1.64
-
// 0.10
0.08
C
E2
e
7, 8
C
0.50 BSC
-
-
A3
C
SIDE VIEW
k
0.20
0.35
-
-
SEATING
PLANE
L
0.40
0.45
8
N
10
2
D2
D2/2
2
7
8
(DATUM B)
Nd
5
3
Rev. 1 4/06
1
6
NOTES:
INDEX
AREA
1. Dimensioning and tolerancing conform to ASME Y14.5-1994.
2. N is the number of terminals.
NX k
E2
(DATUM A)
3. Nd refers to the number of terminals on D.
E2/2
4. All dimensions are in millimeters. Angles are in degrees.
5. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
NX L
N
N-1
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
NX b
8
e
5
(Nd-1)Xe
REF.
M
0.10
C A B
7. Dimensions D2 and E2 are for the exposed pads which provide
improved electrical and thermal performance.
BOTTOM VIEW
8. Nominal dimensions are provided to assist with PCB Land
Pattern Design efforts, see Intersil Technical Brief TB389.
C
L
9. COMPLIANT TO JEDEC MO-229-WEED-3 except for
dimensions E2 & D2.
(A1)
NX (b)
L
9
5
e
SECTION "C-C"
TERMINAL TIP
FOR ODD TERMINAL/SIDE
C C
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN9220.2
May 8, 2006
11
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