INTERSIL ISL9011IRCJZ

ISL9011
®
Data Sheet
October 13, 2005
Dual LDO with Low Noise, Low IQ, and
High PSRR
ISL9011 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 highPSRR and is stable with output capacitance of 1µF to 10µF
with ESR of up to 200mΩ.
A reference bypass pin allows an external capacitor for
adjusting a noise filter for low noise and high PSRR
applications.
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.
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.
FN9219.1
Features
• Integrates two high performance LDOs
- VO1 - 150mA output
- 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
• Wide input voltage capability: 2.3V - 6.5V
• Extremely low quiescent current: 45µA (both LDOs active)
• Low dropout voltage: typically 120mV @ 150mA
• Low output noise: typically 30µVrms @ 100µA (1.5V)
• Stable with 1-10µF ceramic capacitors
• Separate enable pins for each LDO
• Soft-start to limit input current surge during enable
Pinout
• Current limit and overheat protection
ISL9011
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
VIN
1
10 VO1
EN1
2
9
VO2
• Pin compatible with Micrel MIC2211
EN2
3
8
NC
• Pb-free plus anneal available (RoHS compliant)
CBYP
4
7
NC
NC
5
6
GND
Applications
• PDAs, Cell Phones and Smart Phones
• Portable Instruments, MP3 Players
• Handheld Devices including Medical Handhelds
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ISL9011
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART MARKING
VO1 VOLTAGE
VO2 VOLTAGE
TEMP RANGE (°C)
PACKAGE
(Pb-free)
PKG. DWG. #
ISL9011IRVVZ
DAAL
3.6V
3.6V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRNNZ
DAAM
3.3V
3.3V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRNJZ
DTAA
3.3V
2.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRNFZ
DVAA
3.3V
2.5V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRNCZ
DAAN
3.3V
1.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRMNZ
DAAP
3.0V
3.3V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRMMZ
DANA
3.0V
3.0V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRMKZ
DBBJ
3.0V
2.85V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRMJZ
DAAR
3.0V
2.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRMGZ
DAAS
3.0V
2.7V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRMSZ
DAAT
3.0V
1.6V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRLLZ
DAMA
2.9V
2.9V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRLBZ
DAAV
2.9V
1.5V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRKNZ
DAAW
2.85V
3.3V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRKKZ
DWAA
2.85V
2.85V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRKJZ
DYAA
2.85V
2.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRKFZ
DABA
2.85V
2.5V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRKCZ
DAEA
2.85V
1.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRJNZ
DAAY
2.8V
3.3V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRJMZ
DALA
2.8V
3.0V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRJJZ
DBBA
2.8V
2.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRJRZ
DAKA
2.8V
2.6V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRJFZ
DBCA
2.8V
2.5V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRJCZ
DAJA
2.8V
1.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRJSZ
DBDA
2.8V
1.6V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRJBZ
DACA
2.8V
1.5V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRGMZ
DBEA
2.7V
3.0V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRGCZ
DAHA
2.7V
1.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRRMZ
DBFA
2.6V
3.0V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRRKZ
DBGA
2.6V
2.85V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRRCZ
DBHA
2.6V
1.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRFNZ
DBJA
2.5V
3.3V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRFMZ
DBKA
2.5V
3.0V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRFJZ
DADA
2.5V
2.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRFTZ
DBLA
2.5V
1.9V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRFCZ
DBMA
2.5V
1.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRDMZ
DBNA
2.0V
3.0V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRTJZ
DBPA
1.9V
2.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRPLZ
DAGA
1.85V
2.9V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
2
FN9219.1
October 13, 2005
ISL9011
Ordering Information (Continued)
PART NUMBER
(Notes 1, 2, 3)
PART MARKING
VO1 VOLTAGE
VO2 VOLTAGE
TEMP RANGE (°C)
PACKAGE
(Pb-free)
PKG. DWG. #
ISL9011IRCNZ
DBRA
1.8V
3.3V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRCMZ
DBSA
1.8V
3.0V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRCLZ
DBTA
1.8V
2.9V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRCJZ
DBVA
1.8V
2.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRCRZ
DBWA
1.8V
2.6V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRCFZ
DBYA
1.8V
2.5V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRSNZ
DBBB
1.6V
3.3V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRSLZ
DBBC
1.6V
2.9V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRSJZ
DBBD
1.6V
2.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRBUZ
DBBE
1.5V
3.1V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRBLZ
DBBF
1.5V
2.9V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRBKZ
DBBG
1.5V
2.85V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRBJZ
DAFA
1.5V
2.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
ISL9011IRBCZ
DBBH
1.5V
1.8V
-40 to +85
10 Ld 3x3 DFN
L10.3x3C
NOTES:
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.
4. Standard products are listed in Bold text. Contact Intersil Marketing on the availability and lead time of other listed devices.
3
FN9219.1
October 13, 2005
ISL9011
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7.1V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN+0.3)V
Thermal Resistance (Notes 5, 6)
Recommended Operating Conditions
Ambient Temperature Range (TA) . . . . . . . . . . . . . . . .-40°C to 85°C
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3V to 6.5V
θJA (°C/W)
θJC (°C/W)
3x3 DFN Package . . . . . . . . . . . . . . . .
50
10
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
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:
5. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
6. θJC, “case temperature” location is at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
Electrical Specifications
Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature
range of the device as follows:
TA = -40°C to +85°C; VIN = (VO+1.0V) to 6.5V with a minimum VIN of 2.3V; CIN = 1µF; CO = 1µF;
CBYP = 0.01µF
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
6.5
V
DC CHARACTERISTICS
Supply Voltage
VIN
Ground Current
2.3
Quiescent condition: IO1 = 0µA; IO2 = 0µA
IDD1
One LDO active
25
40
µA
IDD2
Both LDO active
45
60
µA
Shutdown Current
IDDS
@25°C
0.1
1.0
µA
UVLO Threshold
VUV+
1.9
2.1
2.3
V
1.6
1.8
VUVRegulation Voltage Accuracy
Variation from nominal voltage output, VIN = VO+0.5 to 5.5V,
TJ = -40°C to 125°C
-1.8
Line Regulation
VIN = (VOUT+1.0V relative to highest output voltage) to 5.5V
-0.2
Load Regulation
IOUT = 100µA to 150mA (VO1 and VO2)
2.0
V
+1.8
%
0
0.2
%/V
0.1
0.7
%
IOUT = 100µA to 300mA (VO2)
Maximum Output Current
IMAX
Internal Current Limit
Thermal Shutdown Temperature
%
150
mA
VO2: Continuous
300
mA
ILIM
Dropout Voltage (Note 8)
1.0
VO1: Continuous
350
475
600
mA
VDO1
IO = 150mA; VO > 2.1V (VO1)
125
200
mV
VDO2
IO = 300mA; VO < 2.5V (VO2)
300
500
mV
VDO3
IO = 300mA; 2.5V ≤ VO ≤ 2.8V (VO2)
250
400
mV
VDO4
IO = 300mA; VO > 2.8V (VO2)
200
325
mV
TSD+
145
°C
TSD-
110
°C
@ 1kHz
70
dB
@ 10kHz
55
dB
@ 100kHz
40
dB
IO = 100µA, VO = 1.5V, TA = 25°C, CBYP = 0.1µF
BW = 10Hz to 100kHz (Note 7)
30
µVrms
AC CHARACTERISTICS
Ripple Rejection (Note 7)
IO = 10mA, VIN = 2.8V(min), VO = 1.8V, CBYP = 0.1µF
Output Noise Voltage (Note 7)
4
FN9219.1
October 13, 2005
ISL9011
Electrical Specifications
Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and temperature
range of the device as follows:
TA = -40°C to +85°C; VIN = (VO+1.0V) to 6.5V with a minimum VIN of 2.3V; CIN = 1µF; CO = 1µF;
CBYP = 0.01µF (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
DEVICE START-UP CHARACTERISTICS
Device Enable TIme
LDO Soft-start Ramp Rate
TEN
Time from assertion of the ENx pin to when the output voltage
reaches 95% of the VO(nom)
250
500
µs
TSSR
Slope of linear portion of LDO output voltage ramp during startup
30
60
µs/V
EN1, EN2 PIN CHARACTERISTICS
Input Low Voltage
VIL
-0.3
0.5
V
Input High Voltage
VIH
1.4
VIN+0.3
V
0.1
µA
Input Leakage Current
IIL, IIH
Pin Capacitance
CPIN
Informative
5
pF
NOTES:
7. Guaranteed by design and characterization.
8. VOx = 0.98 * VOx(NOM); Valid for VOx greater than 1.85V.
5
FN9219.1
October 13, 2005
ISL9011
Typical Performance Curves
0.10
0.8
VO = 3.3V
ILOAD = 0mA
0.4
0.2
-40°C
0.0
25°C
-0.2
85°C
-0.4
VIN = 3.8V
VO = 3.3V
0.08
OUTPUT VOLTAGE CHANGE (%)
OUTPUT VOLTAGE, VO (%)
0.6
-0.6
0.06
0.04
-40°C
0.02
25°C
0.00
-0.02
85°C
-0.04
-0.06
-0.08
-0.8
3.4
3.8
4.6
4.2
5.0
5.4
5.8
6.2
-0.10
6.6
0
50
200
250
300
350
400
LOAD CURRENT - IO (mA)
FIGURE 1. OUTPUT VOLTAGE vs INPUT VOLTAGE (3.3V
OUTPUT)
FIGURE 2. OUTPUT VOLTAGE CHANGE vs LOAD CURRENT
0.10
3.4
VIN = 3.8V
VO = 3.3V
ILOAD = 0mA
0.08
0.06
0.04
0.02
0.00
-0.02
-0.04
-0.06
VO1 = 3.3V
IO = 0mA
3.3
OUTPUT VOLTAGE, VO (V)
OUTPUT VOLTAGE CHANGE (%)
150
100
INPUT VOLTAGE (V)
3.2
IO = 150mA
3.1
3.0
2.9
-0.08
2.8
-0.10
-40
-25
-10
5
20 35 50 65
TEMPERATURE (°C)
80
95
110 125
DROPOUT VOLTAGE, VDO (mV)
OUTPUT VOLTAGE, VO (V)
5.1
5.6
6.1
6.5
300
2.7
IO = 150mA
2.6
IO = 300mA
2.5
2.4
3.1
4.6
350
VO2 = 2.8V
2.8
2.6
4.1
FIGURE 4. OUTPUT VOLTAGE vs INPUT VOLTAGE
(VO1 = 3.3V)
2.9
2.3
3.6
INPUT VOLTAGE (V)
FIGURE 3. OUTPUT VOLTAGE CHANGE vs TEMPERATURE
IO = 0mA
3.1
3.6
4.1
4.6
5.1
5.6
INPUT VOLTAGE (V)
FIGURE 5. OUTPUT VOLTAGE vs INPUT VOLTAGE
(VO2 = 2.8V)
6
6.1
6.5
250
VO2 = 2.8V
200
150
100
VO1 = 3.3V
50
0
0
50
100
150
200
250
OUTPUT LOAD (mA)
300
350
400
FIGURE 6. DROPOUT VOLTAGE vs LOAD CURRENT
FN9219.1
October 13, 2005
ISL9011
Typical Performance Curves
(Continued)
55
175
VO1 = 3.3V
50
GROUND CURRENT (µA)
DROPOUT VOLTAGE, VDO (mV)
150
125
85°C
25°C
100
-40°C
75
50
125°C
25°C
45
-40°C
40
35
VO1 = 3.3V
VO2 = 2.8V
30
25
IO(BOTH CHANNELS) = 0µA
0
25
0
25
50
75
100
125
OUTPUT LOAD (mA)
150
175
200
3.0
4.0
3.5
4.58
5.0
5.5
6.5
6.0
INPUT VOLTAGE (V)
FIGURE 7. VO1 DROPOUT VOLTAGE vs LOAD CURRENT
FIGURE 8. GROUND CURRENT vs INPUT VOLTAGE
55
200
180
50
GROUND CURRENT (µA)
GROUND CURRENT (µA)
160
140
25°C
85°C
120
-40°C
100
80
60
40
40
35
VIN = 3.8V
VO1 = 3.3V
VO2 = 2.8V
20
0
45
0
50
100
150
200
250
300
350
VIN = 3.8V
VO = 3.3V
ILOAD = 0µA
30
BOTH OUTPUTS ON
25
-40
400
-25
-10
5
LOAD CURRENT (mA)
VO1 = 3.3V
VO2 = 2.8V
IL1 = 150mA
VIN
VO1
IL2 = 300mA
VO1 (V)
VO2
2
1
1
0
0
5
0
1
2
3
4
5
TIME (s)
6
7
8
FIGURE 11. POWER-UP/POWER-DOWN
7
110 125
VIN = 5.0V
VO1 = 3.3V
VO2 = 2.8V
IL1 = 150mA
IL2 = 300mA
CL-1, CL-2 = 1µF
CBYP = 0.01µF
3
3
2
95
VO2 (10mV/DIV)
VEN (V)
VOLTAGE (V)
4
80
FIGURE 10. GROUND CURRENT vs TEMPERATURE
FIGURE 9. GROUND CURRENT vs LOAD
5
20 35 50 65
TEMPERATURE (°C)
9
10
0
0
100
200
300
400
500
600
700
800
900 1000
TIME (µs)
FIGURE 12. TURN-ON/TURN-OFF RESPONSE
FN9219.1
October 13, 2005
ISL9011
Typical Performance Curves
(Continued)
VO1 = 3.3V
ILOAD = 150mA
VO2 = 2.8V
ILOAD = 300mA
CLOAD = 1µF
CBYP = 0.01µF
CLOAD = 1µF
CBYP = 0.01µF
4.3V
4.2V
3.6V
3.5V
10mV/DIV
10mV/DIV
400µs/DIV
400µs/DIV
FIGURE 13. LINE TRANSIENT RESPONSE, 3.3V OUTPUT
FIGURE 14. LINE TRANSIENT RESPONSE, 2.8V OUTPUT
100
VIN = 3.6V
VO = 1.8V
IO = 10mA
90
80
VO (25mV/DIV)
CBYP = 0.1µF
VO = 1.8V
VIN = 2.8V
300mA
PSRR (dB)
70
CLOAD = 1µF
60
50
40
30
ILOAD
20
100µA
10
0
0.1
100µs/DIV
1
10
100
FREQUENCY (kHz)
1000
FIGURE 16. PSRR vs FREQUENCY
FIGURE 15. LOAD TRANSIENT RESPONSE
SPECTRAL NOISE DENSITY (nV/√Hz)
1000
100
10
1
VIN = 3.6V
VO = 1.8V
ILOAD = 10mA
CBYP = 0.1µF
CIN = 1µF
CLOAD = 1µF
0.1
10
100
1K
10K
FREQUENCY (Hz)
100K
1M
FIGURE 17. SPECTRAL NOISE DENSITY vs FREQUENCY
8
FN9219.1
October 13, 2005
ISL9011
Pin Description
PIN #
PIN
NAME
TYPE
1
VIN
Analog I/O
2
EN1
Low Voltage Compatible
CMOS Input
LDO-1 Enable.
3
EN2
Low Voltage Compatible
CMOS Input
LDO-2 Enable.
4
CBYP
Analog I/O
5, 7, 8
NC
NC
6
GND
Ground
9
VO2
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).
DESCRIPTION
Supply Voltage / LDO Input:
Connect a 1µF capacitor to GND.
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.
No Connection
GND is the connection to system ground. Connect to PCB Ground plane.
Typical Application
ISL9011
VIN (2.3-6.5V)
1
ON
2
Enable 1
OFF ON
Enable 2
OFF
3
4
5
C1
VIN
VO1
EN1
VO2
EN2
NC
CBYP
NC
NC
GND
C2
10
Vout 1
9
Vout 2
8
7
6
C3
C4
C1, C3, C4: 1µF X5R ceramic capacitor
C2: 0.1µF X5R ceramic capacitor
9
FN9219.1
October 13, 2005
ISL9011
Block Diagram
VIN
IS1
1V
LDO
VREF
VO1
ERROR
TRIM
VO1
AMPLIFIER
QEN1
~1.0V
VO2
LDO-1
EN1
QEN2
QEN1
IS2
IS1
LDO-2
CONTROL
LOGIC
EN2
UVLO
GND
BANDGAP AND
TEMPERATURE
SENSOR
1.00V
CBYP
Functional Description
The ISL9011 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
ISL9011 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 turnon time.
Power Control
The ISL9011 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
10
VOLTAGE
REFERENCE
GENERATOR
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.
If EN1 is brought high, and EN2 is goes high before the VO1
output stablizes, the ISL9011 delays the VO2 turn-on until
the VO1 output reaches its target level. This minimizes input
current surge due to concurrent turn-on.
FN9219.1
October 13, 2005
ISL9011
If EN2 is brought high, and EN1 goes high before the VO2
output stablizes, the ISL9011 delays the VO1 turn-on until
the VO2 output reaches its target level.
If both EN1 and EN2 are brought high at the same time, the
VO1 output has priority, and is always powered up first.
During operation, whenever the VIN voltage drops below
about 1.8V, the ISL9011 immediately disables both LDO
outputs. When VIN rises back above 2.1V, the device reinitiates 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.
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 bandgap generates a zero temperature coefficient (TC)
voltage for the reference divider. The reference divider
provides the regulation reference and other voltage
references required for current generation and overtemperature detection.
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 ISL9011 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
ISL9011 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.
11
FN9219.1
October 13, 2005
ISL9011
Dual Flat No-Lead Plastic Package (DFN)
L10.3x3C
2X
10 LEAD DUAL FLAT NO-LEAD PLASTIC PACKAGE
0.15 C A
A
D
MILLIMETERS
2X
0.15 C B
E
SYMBOL
MIN
0.80
0.90
1.00
-
-
-
0.05
-
0.20 REF
0.18
D
D2
B
A
C
SEATING
PLANE
D2
6
INDEX
AREA
0.08 C
A3
SIDE VIEW
(DATUM B)
0.10 C
7
8
2.48
7, 8
-
3.00 BSC
1.49
e
1.64
1.74
7, 8
0.50 BSC
-
k
0.20
-
-
-
L
0.30
0.40
0.50
8
N
10
2
Nd
5
3
2. N is the number of terminals.
NX k
3. Nd refers to the number of terminals on D.
4. All dimensions are in millimeters. Angles are in degrees.
E2
5. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
E2/2
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 L
N-1
NX b
e
(Nd-1)Xe
REF.
BOTTOM VIEW
5
0.10 M C A B
7. Dimensions D2 and E2 are for the exposed pads which provide
improved electrical and thermal performance.
8. Nominal dimensions are provided to assist with PCB Land
Pattern Design efforts, see Intersil Technical Brief TB389.
9. COMPLIANT TO JEDEC MO-229-WEED-3 except for
dimensions E2 & D2.
CL
NX (b)
2.38
1. Dimensioning and tolerancing conform to ASME Y14.5-1994.
(DATUM A)
8
5, 8
NOTES:
2
N
0.30
Rev. 0 3/05
D2/2
1
E2
0.25
-
3.00 BSC
2.23
E
//
NOTES
A
b
TOP VIEW
MAX
A1
A3
6
INDEX
AREA
NOMINAL
(A1)
9 L
5
e
SECTION "C-C"
C C
TERMINAL TIP
FOR ODD TERMINAL/SIDE
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.
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12
FN9219.1
October 13, 2005