LTC3250-1.5 [ADI]
High Voltage Boost Charge Pump;
| 型号： | LTC3250-1.5 |
| 厂家： | 
ADI |
| 描述： | High Voltage Boost Charge Pump |
| 文件： | 总14页 (文件大小：1441K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC3290
High Voltage Boost
Charge Pump
FEATURES
DESCRIPTION
The LTC®3290 is a high voltage boost charge pump with
a wide 4.5V to 55V input voltage range that can deliver
up to 50mA of output current.
n
Wide Input Range: 4.5V to 55V V /V
IN AUX
n
n
n
n
n
n
n
n
Reverse Input Protection to –55V
Split Input Supplies for High Efficiency Boost Ratios
I
Up to 50mA
OUT
When the V
pin is grounded, the LTC3290 operates
SET
15µA V Quiescent Current
IN
as a standard boost charge pump, boosting the V
OUT
1µA V
Quiescent Current
AUX
output to a maximum of the sum of the V and V
IN
AUX
Stable with Ceramic Capacitors
input supplies. An external resistor divider can be used
Short-Circuit/Thermal Protection
Thermally Enhanced 10-Pin MSOP Package
on the V , FB and GND pins to set the output voltage
OUT
to any value between 1V and V + V
Burst Mode operation.
with hysteretic
IN
AUX
APPLICATIONS
Alternatively,thedevicecanbeconfiguredinaV tracking
IN
n
High Efficiency General Purpose High Voltage Boost
mode, in which the V
pin regulates at a fixed offset
OUT
Supplies
above the V pin. The offset voltage is programmed with
IN
n
High Side N-FET Driver
external resistors, one from the V
to the V pin and
OUT
SET
n
Industrial/Automotive Power Switching
the other from the FB pin to GND. The maximum output
n
V Tracking Supply
IN
voltage is limited to V + V
.
AUX
IN
The LTC3290 is available in a thermally enhanced 10-pin
MSOP package.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
15V Output from a 12V Input (with 5V Auxiliary Input)
Standard Boost Charge Pump Mode, VSET = 0V
Efficiency vs Output Current
ꢑ0
ꢒ0
ꢖ0
ꢓ0
ꢗ0
ꢔ0
ꢘ0
ꢕ0
ꢄꢋꢌ
ꢕꢙ
ꢕꢘ
ꢄꢅꢀ
ꢅꢀ
ꢀ
ꢀ
ꢀ
ꢁꢂꢃ
ꢇꢂꢛ
ꢜꢒ
0ꢆꢇ ꢃꢁ ꢈ0ꢆꢇ
ꢄ0ꢋꢌ
ꢄ0ꢋꢌ
ꢄ0ꢋꢌ
ꢔꢃꢕꢖꢈꢗ0
ꢄ.ꢉꢊ
ꢄꢈꢀ
ꢀ
ꢎꢏꢃ
ꢌꢐ
ꢈ
ꢈ
ꢈ
ꢜ ꢙꢕꢈ
ꢜ ꢗꢈ
ꢂꢄ
ꢏꢒ
ꢙ0
0
ꢎꢊꢏ
ꢉꢊꢋ
ꢜ ꢙꢗꢈ
ꢐꢜꢇꢎ
ꢚꢑꢁꢁꢓ
ꢄ00ꢍ
ꢑꢒꢓ
ꢉ.ꢝꢋꢌ
ꢖꢈꢗ0 ꢃꢇ0ꢄ
0.0ꢙ
0.ꢙ
ꢙ
ꢙ0 ꢕ0
ꢂ
ꢆꢚꢎꢐ
ꢉꢊꢋ
ꢘꢕꢑ0 ꢋꢎ0ꢙꢛ
Rev. 0
1
Document Feedback
For more information www.analog.com
LTC3290
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
(Notes 1, 3)
V , EN, V
.............................................. –60V to 60V
ꢉꢊꢋ ꢌꢍꢎꢏ
IN
AUX
V to V , V to EN...............................................60V
V
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢀ0
ꢅ
V
V
AUX
EN
OUT
SET
IN
AUX IN
ꢀꢀ
ꢐꢑꢒ
+
V
, V .................................................. –0.3V to 60V
OUT SET
C
ꢆ
FB
–
C
ꢇ
ꢈ
PGOOD
BIAS
FB, PGOOD.....................................–0.3V to BIAS + 0.3V
BIAS............................................................. –0.3V to 6V
V
IN
ꢓꢔꢎ ꢋꢕꢖꢗꢕꢐꢎ
ꢀ0ꢘꢙꢎꢕꢒ ꢋꢙꢕꢔꢉꢍꢖ ꢓꢔꢊꢋ
ꢜ ꢀꢄ0ꢝꢖꢞ θ ꢜ ꢃꢄꢝꢖꢟꢏ
ꢚꢕ
ꢎꢛꢋꢊꢔꢎꢒ ꢋꢕꢒ ꢠꢋꢍꢑ ꢀꢀꢡ ꢍꢔ ꢐꢑꢒꢞ ꢓꢢꢔꢉ ꢣꢎ ꢔꢊꢙꢒꢎRꢎꢒ ꢉꢊ ꢋꢖꢣ
V
Short-Circuit Duration............................. Indefinite
OUT
ꢉ
ꢚꢓꢕꢛ
Operating Junction Temperature Range
(Notes 2, 3)............................................ –55°C to 150°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)...................300°C
ORDER INFORMATION
LEAD FREE FINISH
LTC3290EMSE#PBF
LTC3290IMSE#PBF
LTC3290HMSE#PBF
LTC3290MPMSE#PBF
TAPE AND REEL
PART MARKING*
LTGZW
PACKAGE DESCRIPTION
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
LTC3290EMSE#TRPBF
LTC3290IMSE#TRPBF
LTC3290HMSE#TRPBF
LTC3290MPMSE#TRPBF
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
LTGZW
LTGZW
LTGZW
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev. 0
2
For more information www.analog.com
LTC3290
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = EN = 12V, VAUX = 5V.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Boost Charge Pump
l
l
l
V
V
Input Supply Voltage Range
Auxiliary Supply Voltage Range
Sum of Input Supply Voltages
4.5
4.5
9
55
55
55
67
V
V
V
IN
AUX
(V + V
)
AUX
IN
(V + V )_OV Input Overvoltage Rising Threshold
(V + V ) Rising, V = Hig
63
65
4
V
V
IN
AUX
IN
AUX
SET
Hysteresis
(Note 4)
V
Output Overvoltage Rising Threshold
Hysteresis
V
Rising
63
65
4
67
V
V
OUT_OV
VIN
OUT
(Note 4)
I
I
V
Quiescent Current
Shutdown, EN = 0V
3
15
5
30
µA
µA
IN
I
= 0mA
VOUT
V
Quiescent Current
Shutdown, EN = 0V
= 0mA
1
1
3
3
µA
µA
VAUX
AUX
I
VOUT
l
V
FB Regulation Voltage
0.98
100
0.4
1
65
150
1.1
1
1.02
V
Ω
mA
V
FB
R
Effective Open Loop Output Resistance
OL
l
l
l
l
l
I
V
Current Limit
V Not in Regulation (Note 5)
OUT
200
2
CL_VOUT
OUT
V
V
V
V
Enable Pin Threshold Rising
Enable Pin Threshold Falling
ENH
ENL
V
V
V
Pin Threshold Rising
Pin Threshold Falling
1.1
1
2
V
SETH
SETL
SET
SET
0.4
–1
V
I
Enable Pin Leakage Current
0
1
µA
%
%
V
EN
l
l
V
V
V
V
PGOOD Pin Threshold Rising in Boost
PGOOD Pin Threshold Falling in Boost
% of Final Regulation Voltage, V = GND
95
91
–1.5
–1.6
98
PG_RISE_BST
PG_FALL_BST
PG_RISE_TRK
PG_FALL_TRK
PGOOD_HIGH
SET
% of Final Regulation Voltage, V = GND
88
–1
SET
PGOOD Pin Threshold Rising in Tracking Offset from Programmed V
PGOOD Pin Threshold Falling in Tracking Offset from Programmed V
OUT
OUT
V
l
l
I
PGOOD Output High Leakage Current
PGOOD Output Low Voltage
V
= 3V
1
µA
V
PGOOD
PGOOD
V
I
= 0.2mA
0.1
0.4
PGOOD_LOW
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
The junction temperature (T , in °C) is calculated from the ambient
J
temperature (T , in °C) and power dissipation (P , in Watts) according to
A
D
the formula:
T = T + (P • θ ),
J
A
D
JA
where θ = 45°C/W is the package thermal impedance.
JA
Note 2: The LTC3290 is tested under pulsed load conditions such
that T ≈ T . The LTC3290E is guaranteed to meet specifications from
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperatures will exceed 150°C when overtemperature protection is
active. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
Note 4: This IC includes overvoltage protection that is intended to protect
the device during momentary overload conditions. Pin voltages will
exceed ABSMAX voltage ratings of the part while the protection is active.
Continuous operation above the ABSMAX voltage ratings may result in
device degradation or failure.
J
A
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3290I is guaranteed over the –40°C to 125°C operating junction
temperature range, the LTC3290H is guaranteed over the –40°C to 150°C
operating junction temperature range and the LTC3290MP is guaranteed
over the –55°C to 150°C operating junction temperature range. Note that
the maximum ambient temperature consistent with these specifications
is determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors.
Note 5: Current limit is a protection feature. Refer to Available Output
Current section in Applications Information for additional information.
During a short-circuit event, the current limit is folded back further to
reduce power dissipation.
Rev. 0
3
For more information www.analog.com
LTC3290
TA = 25°C, CFLY = 1µF, CIN = CAUX = COUT = 10µF
TYPICAL PERFORMANCE CHARACTERISTICS
unless otherwise noted.
Quiescent Current vs Temperature
(Boost Mode)
Quiescent Current vs Temperature
(VIN Tracking Mode)
Shutdown Current vs Temperature
ꢓꢔ
ꢓ0
ꢋꢔ
ꢋ0
ꢔ
ꢑꢒ
ꢑ0
ꢓꢒ
ꢓ0
ꢋꢒ
ꢋ0
ꢒ
ꢑ0
ꢒꢓ
ꢒ0
ꢋꢓ
ꢋ0
ꢓ
ꢖ
ꢗ ꢓꢓꢖ
ꢍꢏ
ꢖ
ꢗ ꢋꢒꢖ
ꢍꢏ
ꢖ
ꢗ ꢒꢒꢖ
ꢍꢏ
ꢘ
ꢚ ꢔꢔꢘ
ꢙꢑ
ꢖ
ꢗ ꢋꢓꢖ
ꢍꢏ
ꢘ
ꢚ ꢋꢓꢘ
ꢙꢑ
ꢖ
ꢗ ꢘ.ꢓꢖ
ꢓ0
ꢖ
ꢗ ꢘ.ꢒꢖ
ꢍꢏ
ꢍꢏ
ꢘ
ꢚ ꢛ.ꢔꢘ
ꢙꢑ
0
0
0
ꢊꢋ00 ꢊꢔ0
0
ꢔ0
ꢋ00
ꢋꢔ0
ꢓ00
ꢊꢋ00 ꢊꢒ0
0
ꢒ0
ꢋ00
ꢋꢒ0
ꢓ00
ꢊꢋ00 ꢊꢓ0
0
ꢋ00
ꢋꢓ0
ꢒ00
ꢀꢁꢂꢃꢁRꢄꢀꢅRꢁ ꢆꢇꢈꢉ
ꢀꢁꢂꢃꢁRꢄꢀꢅRꢁ ꢆꢇꢈꢉ
ꢀꢁꢂꢃꢁRꢄꢀꢅRꢁ ꢆꢇꢈꢉ
ꢕꢓꢖ0 ꢗ0ꢋ
ꢑꢓꢔ0 ꢕ0ꢓ
ꢑꢒꢔ0 ꢕ0ꢑ
VOUT Effective Open Loop
Resistance vs Temperature
VOUT Current Limit vs Supply
Voltage
100
80
60
40
20
0
ꢓꢔ0
ꢓꢕ0
ꢓꢗ0
ꢓꢖ0
ꢓ00
ꢔ0
V
V
= 12V
AUX
ꢈ
ꢁꢉꢄ ꢀꢁ Rꢌꢋꢃꢆꢊꢄꢀꢉꢁ
IN
ꢉꢃꢄ
= 5V
ꢕ0
ꢗ0
ꢖ0
0
–100 –50
0
50
100
150
200
0
ꢓ0
ꢖ0
ꢙ0
ꢗ0
ꢘ0
ꢕ0
TEMPERATURE (°C)
ꢀꢁꢂꢃꢄ ꢅꢃꢂꢂꢆꢇ ꢈꢉꢆꢄꢊꢋꢌ ꢍꢈꢎ
3290 G04
ꢙꢖꢚ0 ꢋ0ꢘ
FB Pin Voltage vs Temperature
VBIAS vs Supply Voltage
ꢋ.0ꢔ0
ꢋ.0ꢋꢕ
ꢋ.0ꢋ0
ꢋ.00ꢕ
ꢋ.000
0.ꢖꢖꢕ
0.ꢖꢖ0
0.ꢖꢗꢕ
0.ꢖꢗ0
ꢐ.0
ꢑ.ꢐ
ꢑ.0
ꢒ.ꢐ
ꢒ.0
ꢓ.ꢐ
ꢓ.0
ꢔ.ꢐ
ꢔ.0
0.ꢐ
0
ꢐ
ꢚ ꢋꢔꢐ
ꢎꢏ
ꢊꢋ00 ꢊꢕ0
0
ꢕ0
ꢋ00
ꢋꢕ0
ꢔ00
0
ꢔ0
ꢓ0
ꢒ0
ꢑ0
ꢐ0
ꢗ0
ꢀꢁꢂꢃꢁRꢄꢀꢅRꢁ ꢆꢇꢈꢉ
ꢀꢁꢂꢃꢄ ꢅꢃꢂꢂꢆꢇ ꢈꢉꢆꢄꢊꢋꢌ ꢍꢈꢎ
ꢘꢔꢖ0 ꢓ0ꢙ
ꢒꢓꢕ0 ꢋ0ꢖ
Rev. 0
4
For more information www.analog.com
LTC3290
TA = 25°C, CFLY = 1µF, CIN = CAUX = COUT = 10µF
TYPICAL PERFORMANCE CHARACTERISTICS
unless otherwise noted.
VOUT Output Ripple (Boost Mode)
VOUT Transient (Boost Mode)
ꢀ
ꢁꢂꢃ
ꢄ00ꢅꢀꢆꢇꢈꢀ
ꢉꢊꢋꢊꢁꢂꢌꢍꢎꢇ
ꢀ
ꢁꢂꢃ
ꢄ00ꢅꢀꢆꢇꢈꢀ
ꢉꢊꢋꢊꢁꢂꢌꢍꢎꢇ
ꢄ0ꢅꢉ
ꢈ
ꢀꢁꢂꢃ
ꢏꢅꢉ
ꢒꢄꢓ0 ꢔ0ꢕ
ꢒꢄꢓ0 ꢔ0ꢓ
ꢄꢏ0ꢐꢑꢆꢇꢈꢀ
ꢗ ꢏ ꢙ
ꢄ.ꢐꢅꢑꢆꢇꢈꢀ
ꢀ
ꢀ
ꢗ ꢘꢄ ꢙ ꢀ
ꢁꢂꢃ
ꢀ
ꢀ
ꢖ ꢏꢄ ꢗ ꢀ
ꢁꢂꢃ
ꢖ ꢐ ꢗ
ꢉꢂꢘ
ꢖ ꢏꢅꢉ ꢃꢁ ꢄ0ꢅꢉ
ꢀꢁꢂꢃ
ꢈꢖ
ꢉꢂꢚ
ꢈꢕ
ꢛ
ꢙ
ꢗ ꢘꢏ ꢙ ꢈ
ꢗ ꢄ0ꢅꢉ
ꢖ ꢏꢐ ꢗ ꢈ
ꢀꢁꢂꢃ
VOUT Output Ripple
(Tracking Mode)
VOUT Transient (Tracking Mode)
ꢀ
ꢁꢂꢃ
ꢄ00ꢅꢀꢆꢇꢈꢀ
ꢉꢊꢋꢊꢁꢂꢌꢍꢎꢇ
ꢀ
ꢁꢂꢃ
ꢄ00ꢅꢀꢆꢇꢈꢀ
ꢉꢊꢋꢊꢁꢂꢌꢍꢎꢇ
ꢄ0ꢅꢉ
ꢈ
ꢀꢁꢂꢃ
ꢏꢅꢉ
ꢒꢄꢓ0 ꢔꢕ0
ꢒꢄꢓ0 ꢔꢏꢏ
ꢄꢏ0ꢐꢑꢆꢇꢈꢀ
ꢗ ꢕꢄ ꢘ
ꢄ.ꢐꢅꢑꢆꢇꢈꢀ
ꢖ ꢏꢄ ꢗ
ꢀ
ꢀ
ꢗ ꢕꢄ ꢘ ꢀ
ꢀ
ꢀ
ꢖ ꢏꢄ ꢗ ꢀ
ꢉꢂꢘ
ꢈꢖ
ꢉꢂꢙ
ꢈꢕ
ꢚ
ꢙ
ꢗ ꢛꢀ ꢜ ꢕ0ꢀꢝꢘ ꢈ
ꢗ ꢄ0ꢅꢉ
ꢖ ꢚꢀ ꢛ ꢏ0ꢀꢜꢗ ꢈ
ꢖ ꢏꢅꢉ ꢃꢁ ꢄ0ꢅꢉ
ꢁꢂꢃ
ꢈꢖ
ꢀꢁꢂꢃ
ꢁꢂꢃ
ꢈꢕ
ꢀꢁꢂꢃ
Rev. 0
5
For more information www.analog.com
LTC3290
PIN FUNCTIONS
V
(Pin 1): Auxiliary Input Supply Voltage. V
should
AUX
pin servos to 1V to achieve the desired output voltage at
the V pin. In tracking mode, an external resistor from
AUX
be bypassed with a low impedance ceramic capacitor.
OUT
the FB pin to GND generates a reference current. This
EN (Pin 2): Enable Logic Input. A logic high on the EN pin
enables the part and regulates the output voltage to the
desired value depending on the circuit configuration and
current is replicated at the V pin. An external resistor
SET
from V
OUT
to the V pin sets the effective voltage at the
OUT
SET
V
Pin. This configuration is used in the tracking mode,
the state of the V pin. Do not float this pin.
SET
when V
above the input voltage V .
is desired to be set to a fixed offset voltage
OUT
+
C (Pin 3): Flying Capacitor Positive Connection.
IN
–
C (Pin 4): Flying Capacitor Negative Connection.
V
(Pin 9): Output Voltage Set Pin. An external resis-
SET
tor from this pin to the V
pin sets the output voltage
OUT
V (Pin 5): Input Supply Voltage. V should be bypassed
IN
IN
of the part in V tracking mode. For conventional boost
IN
with a low impedance ceramic capacitor.
charge pump operation, this pin must be grounded. Do
BIAS (Pin 6): Internal BIAS Voltage, 4.5V (typ). Connect
this pin to a 4.7µF bypass capacitor to GND. A ceramic
capacitor of at least 6.3V rating is recommended. The bias
pin is for internal operation only and should not be loaded
or driven externally.
not float this pin.
V
(Pin10):OutputVoltage.Thispinshouldbebypassed
OUT
with a low impedance ceramic capacitor to GND in normal
boost charge pump mode or to the V pin in V track-
IN
IN
OUT
ing mode. When the V pin is set to GND, the V
pin
SET
PGOOD (Pin 7): Power Good Output. This open drain
output is low when the part is enabled and the output is
not in regulation. Once the part reaches regulation, this
pin transitions to a Hi-Z state. An external resistor pull-up
to a suitable voltage ≤ 3.6V is required to interface this pin
with external circuitry such as a microprocessor.
voltage is set by an external divider between the V , FB
OUT
and GND pins. In V tracking mode, the V
pin oper-
IN
OUT
ates at a fixed offset voltage above the V pin. The value
IN
of the offset voltage is set by a pair of external resistors,
one from the V
the FB pin to GND.
pin to the V
pin and another from
OUT
SET
FB (Pin 8): Feedback Input Voltage. When the V pin is
SET
GND(ExposedPadPin11):Ground.Theexposedpackage
is ground and must be soldered to the PC board ground
plane for proper functionality and for rated thermal per-
formance.
settoGND,theFBpinfunctionsasaconventionalfeedback
input pin. An external resistor divider from the V
pin
OUT
pin. The FB
to GND sets the output voltage at the V
OUT
Rev. 0
6
For more information www.analog.com
LTC3290
BLOCK DIAGRAM
ꢇ
ꢒ
ꢎ0
ꢐ
ꢏ
ꢑ
ꢑ
ꢀ
ꢓꢔꢃ
ꢀ
ꢀ
ꢌꢔꢚ
ꢎ
ꢕ
ꢁꢎ
ꢁꢇ
ꢁꢈ
ꢋꢅ
ꢊꢓꢓꢁꢃ
ꢑꢛꢌRꢄꢂ
ꢖꢔꢜꢖ
ꢁꢒ
ꢀ
ꢁꢂꢃ
ꢉ
ꢈꢕ0ꢝꢛꢞ
ꢋꢅꢃꢂRꢅꢌꢟ
ꢓꢁꢑ
ꢑꢛꢌRꢄꢂ ꢖꢔꢜꢖ
ꢌꢅꢆ
ꢋꢅꢖꢔꢃ ꢟꢓꢄꢋꢑ
ꢂꢅ
ꢈ
ꢎꢀ
Rꢂꢘ
ꢘꢊ
ꢙ
ꢗ
ꢊꢋꢌꢁ
ꢋꢅꢃꢂRꢅꢌꢟ
ꢊꢋꢌꢁ
ꢍ
ꢏ
ꢐ
ꢖꢄꢓꢓꢆ
Rꢂꢘ
ꢖꢄꢓꢓꢆ
0
ꢎ
ꢐ
ꢏ
ꢀ
ꢐ
ꢏ
ꢀ
ꢓꢁ
ꢋꢅ
ꢀ
ꢁꢂꢃ
ꢀ
ꢁꢂꢃ
ꢄꢅꢆ
ꢎꢎ
ꢇꢈꢉ0 ꢊꢆ
Rev. 0
7
For more information www.analog.com
LTC3290
(Refer to the Block Diagram)
OPERATION
ꢇ
ꢋꢍꢎ
The LTC3290 is a high voltage boost charge pump that
uses an input power supply and an auxiliary supply to
generate high efficiency boosted output voltages. It sup-
ports a wide input power supply range from 4.5V to 55V
and a wide auxiliary power supply range from 4.5V to 55V
to generate boosted output voltages up to 55V.
ꢇꢕ
ꢇꢔ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢁꢂꢃ
ꢄꢂꢅ
ꢄꢂꢅ
ꢗꢐ
ꢁꢂꢃ
ꢇ
ꢇ
ꢇ
ꢁꢂꢃ
ꢄꢂꢅ
ꢗꢐ
ꢍꢃꢇꢒꢆꢓ0
Rꢆ
Rꢈ
ꢀ
ꢀ
ꢗꢐ
ꢉꢊꢃ
ꢋꢌ
Shutdown Mode
ꢊꢐ
ꢌꢗꢄꢉ
ꢖꢏꢁꢁꢑ
In shutdown mode, all circuitry except the internal bias
is turned off. The LTC3290 is in shutdown when a logic
low is applied to the enable input (EN). The LTC3290 only
ꢏꢐꢑ
ꢇ
ꢌꢗꢄꢉ
ꢒꢆꢓ0 ꢋ0ꢆ
Figure 1. Boost Charge Pump with VOUT Regulation
draws 3µA (typ.) from the V supply in shutdown. If the
IN
V
pin is tied to V it draws an additional 1µA (typ.)
AUX
in shutdown.
IN
V Tracking Mode
IN
The LTC3290 can be configured to set the V
voltage
OUT
Charge Pump Operation and V
Regulation
to track the V voltage with a fixed offset as shown in
OUT
IN
Figure 2.
The LTC3290 boost charge pump provides low power
BurstMode® operation.Theboostchargepumpandoscilla-
tor circuit are enabled using the EN pin. At the beginning of
a clock cycle, switches S1 and S4 are closed. The external
ꢇ
ꢁꢂꢃ
ꢇ
ꢋꢍꢎ
+
–
flying capacitor across the C and C pins is charged to the
V
supply.Inthesecondphaseoftheclockcycle,switches
AUX
S1andS4areopened,whileswitchesS2andS3areclosed.
ꢇꢔ
ꢇꢓ
ꢀ
ꢀ
ꢀ
ꢀ
ꢁꢂꢃ
ꢄꢅ
ꢄꢅ
ꢁꢂꢃ
–
In this configuration the C side of the flying capacitor is
ꢇ
ꢇ
ꢄꢅ
ꢍꢃꢇꢑꢆꢒ0
Rꢆ
Rꢈ
+
connected to V and charge is delivered through the C
IN
ꢊꢅ
ꢀ
ꢉꢊꢃ
ꢋꢌ
pin to V . An external resistor divider from V
to the
pin.
OUT
OUT
ꢀ
ꢖꢂꢗ
ꢀ
ꢖꢂꢗ
FB and GND pins sets the output voltage at the V
OUT
ꢖꢂꢗ
ꢌꢄꢖꢉ
ꢕꢏꢁꢁꢐ
The V
output voltage is given by
ꢏꢅꢐ
OUT
ꢇ
ꢌꢄꢖꢉ
ꢑꢆꢒ0 ꢋ0ꢑ
⎛
⎜
⎝
⎞
R2
R1
V
= 1V •
+1
⎟
OUT
⎠
Figure 2. Boost Charge Pump with VIN Tracking
Once the V
voltage reaches its programmed value, the
The V
output voltage in this configuration is given by
OUT
OUT
part shuts down the internal oscillator to reduce switch-
ing losses and goes into a low current state. This state is
referred to as the sleep state in which the part consumes
⎛
⎜
⎝
⎞
⎟
⎠
R2
R1
V
= V +1V •
IN
OUT
onlyabout15µAfromtheV pin. Whentheoutputvoltage
IN
In this configuration, the FB pin servos to 1V. This voltage
combinedwiththeexternalresistorR1createsareference
current which is mirrored into the other external resistor
(R2) between the V
of these two resistors creates a fixed offset voltage above
droops enough to overcome the burst comparator hys-
teresis, the part wakes up and commences boost charge
pump cycles until the V
output voltage exceeds the
OUT
and V
pins. The combination
OUT
SET
V
OUT
programmed voltage. For low current operation, it
is important to note that the external divider adds a cur-
rent equal to 2 • (1V/R1) to the total quiescent current.
Recommended range of values for R1 is 100k to 500k.
V
at the V
pin. The magnitude of this offset is set
IN
OUT
only by external resistors R1 and R2. The auxiliary sup-
Rev. 0
8
For more information www.analog.com
LTC3290
(Refer to the Block Diagram)
OPERATION
ply (V ) serves as an upper maximum for the offset
Short-Circuit/Thermal Protection
AUX
voltage. R2 and R1 values must be chosen such that the
The LTC3290 has built-in short-circuit current limit as
well as overtemperature protection. During an overcurrent
condition, thepartautomaticallylimitsoutputcurrentfrom
offset voltage does not exceed V . For low quiescent
AUX
current operation, it is important to note that the external
divider adds a current equal to 2 • (1V/R1) to the total
quiescent current. Recommended range of values for R1
is 100k to 500k.
the V
pin to 150mA (typ). In the event of a short-circuit
OUT
OUT
on the V
pin, the output current is dialed back to further
reduce power dissipation. If the junction temperature ex-
ceedsapproximately175°Cthethermalshutdowncircuitry
disables current delivery to the output. Once the junction
temperature drops back to approximately 165°C, current
delivery to the output resumes. When thermal protection
is active the junction temperature is beyond the specified
operating range. Thermal protection is intended for mo-
mentary overload conditions outside of normal operation.
Continuous operation above the specified maximum op-
erating junction temperature may impair device reliability.
Soft-Start
The LTC3290 has built in soft-start circuitry to prevent
excessive current flow during start-up. The soft-start is
achievedbyinternalcircuitrythatslowlyrampstheamount
of current available at the output storage capacitors on the
V
pin. The soft-start circuitry is reset in the event of a
OUT
commanded shutdown or thermal shutdown.
APPLICATIONS INFORMATION
Available Output Current
100
V
V
= 12V
AUX
IN
= 5V
For the LTC3290, the available output current can be
calculated from the effective open-loop output resistance,
80
60
40
20
0
R , and the effective output voltage, (V + V
)
.
OL
IN
AUX (MIN)
From Figure 3, the available current is given by:
V + V
– V
OUT
(
)
IN
AUX
I
=
OUT
R
OL
–100 –50
0
50
100
150
200
R
OL
TEMPERATURE (°C)
+
–
3290 F04
+
–
(V + V
IN
)
I
V
OUT
AUX
OUT
Figure 4. Typical ROL vs Temperature
Input/Output Capacitor Selection
3290 F03
ThestyleandvalueofthecapacitorsusedwiththeLTC3290
determine several important parameters such as output
ripple, charge pump strength and minimum turn-on time.
To reduce noise and ripple, it is recommended that low
ESR ceramic capacitors be used for the charge pump
Figure 3. Equivalent Open-Loop Circuit
The value of the R depends on many factors such as the
OL
internal oscillator frequency (f ), the value of the flying
OSC
capacitor (C ), the nonoverlap time, the internal switch
FLY
output. C
should retain at least 5µF of capacitance over
resistances (R ) and the ESR of the external capacitors.
OUT
S
operating temperature and bias voltage. In Boost Mode,
tantalum and aluminum capacitors can be used in parallel
Typical R values of the boost charge pump as a function
of temperature are shown in Figure 4.
OL
Rev. 0
9
For more information www.analog.com
LTC3290
APPLICATIONS INFORMATION
with a ceramic capacitor to increase the total capacitance
but should not be used alone because of their high ESR.
60% or more of their capacitance when the rated voltage
isapplied.Thereforewhencomparingdifferentcapacitors,
it is often more appropriate to compare the amount of
achievable capacitance for a given case size rather than
discussing the specified capacitance value. The capacitor
manufacture’s data sheet should be consulted to ensure
the desired capacitance at all temperatures and voltages.
Below is a list of ceramic capacitor manufacturers and
their websites.
Increasing the size of C
will reduce the output ripple
OUT
at the expense of higher minimum turn-on time.
Just as the value of C controls the amount of output
OUT
ripple, the values of C and C
control the amount of
AUX
IN
ripplepresentattheinputpins(V andV ).Theamount
IN
AUX
of bypass capacitance required at the input depends on
the source impedance driving V and V . For best re-
IN
IN
AUX
AUX
sults it is recommended that V and V
be bypassed
AVX
www.avxcorp.com
www.kemet.com
with at least 5µF of low ESR capacitance. A high ESR
capacitor such as tantalum or aluminum will have higher
input noise than a low ESR ceramic capacitor. Therefore,
a ceramic capacitor is recommended as the main bypass
capacitance with a tantalum or aluminum capacitor used
in parallel if desired.
Kemet
Murata
Taiyo Yuden
Vishay
TDK
www.murata.com
www.t-yuden.com
www.vishay.com
www.component.tdk.com
Layout Considerations
Flying Capacitor Selection
Due to high switching frequency and high transient cur-
rents produced by the LTC3290, careful board layout is
necessary for optimum performance. A true ground plane
and short connections to all the external capacitors will
improve performance and ensure proper regulation under
all conditions. Figure 5 shows an example layout for the
LTC3290.
The flying capacitor (C ) controls the strength of the
FLY
charge pumps. A 1µF or greater ceramic capacitor is sug-
gested for the flying capacitor for applications requiring
the full rated output current of the charge pump. Polarized
capacitors such as aluminum or tantalum should not be
used for C because the voltage on C can reverse
FLY
FLY
during startup.
+
–
TheflyingcapacitornodesC ,andC switchlargecurrents
at a high frequency. These nodes should not be routed
For very light load applications, the flying capacitor may
be reduced to save space or cost. For example, a 0.2µF
capacitormightbesufficientforloadcurrentsupto10mA.
A smaller flying capacitor leads to a larger effective open
close to sensitive pins such as FB and V pins.
SET
Thermal Management
loop resistance (R ) and thus limits the maximum load
OL
At high input voltages and maximum output current, there
can be substantial power dissipation in the LTC3290. If
the junction temperature increases above approximately
175°C, the thermal shutdown circuitry will automatically
deactivate the output. To reduce the maximum junction
temperature, a good thermal connection to the PC board
groundplaneisrecommended.Connectingtheexposedpad
of the package to a ground plane under the device on two
layers of the PC board can reduce the thermal resistance
of the package and PC board considerably.
current that can be delivered by the charge pump.
Ceramic Capacitors
Ceramiccapacitorsofdifferentmaterialslosetheircapaci-
tancewithhighertemperatureandvoltageatdifferentrates.
For example, a capacitor made of X5R or X7R material
will retain most of its capacitance from –40°C to 85°C
whereasaZ5UorY5Vstylecapacitorwillloseconsiderable
capacitance over that range. Z5U and Y5V capacitors may
also have a poor voltage coefficient causing them to lose
Rev. 0
10
For more information www.analog.com
LTC3290
APPLICATIONS INFORMATION
ꢔ.0
ꢎ.0
ꢗ.0
ꢕ.0
ꢘ.0
ꢖ.0
0
θ
ꢝ ꢗꢎꢊꢋꢞꢑ
ꢜꢀ
ꢉꢊꢋ
ꢀ
ꢆꢟꢄRꢁꢀꢠ
ꢓꢟꢈꢆꢒꢐꢑꢅ
ꢄꢂꢅ
ꢀ
ꢇ
ꢁꢂꢃ
ꢁꢂꢃ
ꢇ
ꢄꢂꢅ
ꢆ ꢝ ꢖꢛꢎꢊꢋ
ꢜ
Rꢆ
Rꢄꢋꢐꢁꢁꢄꢅꢒꢄꢒ
ꢐꢇꢄRꢀꢆꢃꢐꢅ
ꢇ
ꢆ ꢝ ꢖꢎ0ꢊꢋ
ꢜ
ꢒꢔꢎ
Rꢈ
ꢇ
ꢍꢎꢏ
ꢇ
ꢌꢊ
ꢍꢎ0 ꢍꢘꢎ
0
ꢘꢎ ꢎ0 ꢛꢎ ꢖ00 ꢖꢘꢎ ꢖꢎ0 ꢖꢛꢎ
ꢀꢁꢂꢃꢄꢅꢆ ꢆꢄꢁꢇꢄRꢀꢆꢈRꢄ ꢉꢊꢋꢌ
ꢕꢘꢙ0 ꢚ0ꢔ
ꢀ
ꢌꢊ
Figure 6. Maximum Power Dissipation vs Ambient Temperature
ꢉꢊꢋ
The power dissipated in the LTC3290 should always fall
under the recommended operation line shown for a given
ambient temperature.
V
IN
TRACKING LAYOUT
Power dissipated in the LTC3290:
ꢉꢊꢋ
P = (V + V
– V ) • I
OUT OUT
D
IN
AUX
ꢀ
ꢄꢂꢅ
where I
denotes the output load current.
OUT
ꢇ
ꢄꢂꢅ
ꢀ
ꢇ
ꢁꢂꢃ
ꢁꢂꢃ
The derating curve in Figure 6 assumes a maximum ther-
mal resistance, θ , of 45°C/W for the package. This can
Rꢆ
JA
be achieved with a four layer PCB that includes 2oz Cu
traces and six vias from the exposed pad of the LTC3290
to the ground plane.
Rꢈ
ꢇ
ꢒꢔꢎ
ꢇ
ꢍꢎꢏ
ꢇ
ꢌꢊ
It is recommended that the LTC3290 be operated in the
region corresponding to T ≤ 150°C for continuous op-
J
ꢀ
ꢌꢊ
eration as shown in Figure 6. Operation beyond 150°C
should be avoided as it may degrade part performance
andlifetime.Athightemperatures,typicallyaround175°C,
the part goes into thermal shutdown and all outputs are
disabled. When the part cools back down to a low enough
temperature, typically around 165°C, the outputs are re-
enabled and the part resumes normal operation.
ꢉꢊꢋ
ꢐꢆꢑ0 ꢒ0ꢓ
BOOST LAYOUT
Figure 5. Recommended Layout
Derating Power at High Temperatures
To prevent an overtemperature condition in high power
applications, Figure 6 should be used to determine the
maximumcombinationofambienttemperatureandpower
dissipation.
Rev. 0
11
For more information www.analog.com
LTC3290
TYPICAL APPLICATIONS
ꢈ0ꢋꢌ
ꢈꢋꢌ
ꢕꢇ
ꢕꢘ
ꢀ
ꢀ
ꢀ
ꢄꢀ ꢇ ꢈ0ꢀꢉ
ꢅꢆꢃ
ꢚꢒ
ꢁꢂꢃ
ꢈꢍꢀ
ꢈ0ꢋꢌ
ꢈ0ꢋꢌ
ꢔꢃꢕꢖꢍꢗ0
ꢈꢊ
ꢀ
ꢏꢐꢃ
ꢌꢅ
ꢆꢂꢛ
ꢈ00ꢎ
ꢐꢒ
ꢅꢚꢆꢏ
ꢙꢑꢁꢁꢓ
ꢑꢒꢓ
ꢜ.ꢝꢋꢌ
ꢖꢍꢗ0 ꢃꢆ0ꢖ
Figure 7. 10V Plus Battery Tracking Application
ꢈꢉꢊ
ꢔꢗ
ꢔꢖ
ꢅꢄꢀ
ꢀ
ꢀ
ꢀ
ꢄꢅꢀ
ꢙꢂꢚ
ꢛꢑ
ꢁꢂꢃ
ꢈ0ꢉꢊ
ꢈ0ꢉꢊ
ꢈ0ꢉꢊ
ꢓꢃꢔꢆꢅꢕ0
ꢄ.ꢆꢅꢇ
ꢀ
ꢍꢎꢃ
ꢊꢏ
ꢎꢑ
ꢏꢛꢙꢍ
ꢘꢐꢁꢁꢒ
ꢈ0ꢋꢌ
ꢐꢑꢒ
ꢄ.ꢜꢉꢊ
ꢆꢅꢕ0 ꢃꢙ0ꢄ
Figure 8. 24V to 42V Boost
Q1A
Q1B
LOAD
C6
+
C
LOAD
100µF
1µF
R6
10k
Z1
18V
R4
10Ω
R5
10Ω
R11
300Ω
C4
4.7µF
R10
1k
R7
100k
C3
0.1µF
Q2
12V
LEAD ACID
BATTERY
Q3
C+
C–
V
V
OUT
IN
R8
100k
C1
1µF
R1
499k
R9
Q1A, Q1B: Si4946CEY
Q2, Q3: CMPT3904E
Z1: CMHZ5248B
V
SET
1k
R2
100k
EN
LTC3290
1W
Z2: MMSZ5245B
EN
EN
FB
3.3V
V
BIAS
GND PGOOD
AUX
C5
4.7µF
C2
1µF
Z2
15V
R3
510k
PGOOD
3290 TA05
Figure 9. High Side FET Driver with Inrush Current Limiting and Load Disconnect
Rev. 0
12
For more information www.analog.com
LTC3290
PACKAGE DESCRIPTION
MSE Package
10-Lead Plastic MSOP, Exposed Die Pad
(Reference LTC DWG # 05-08-1664 Rev I)
BOTTOM VIEW OF
EXPOSED PAD OPTION
1.88
(.074)
1.88 ±0.102
(.074 ±.004)
0.889 ±0.127
(.035 ±.005)
1
0.29
REF
1.68
(.066)
0.05 REF
5.10
(.201)
MIN
1.68 ±0.102
3.20 – 3.45
DETAIL “B”
(.066 ±.004) (.126 – .136)
CORNER TAIL IS PART OF
THE LEADFRAME FEATURE.
FOR REFERENCE ONLY
DETAIL “B”
10
NO MEASUREMENT PURPOSE
0.50
(.0197)
BSC
0.305 ± 0.038
(.0120 ±.0015)
TYP
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
0.497 ±0.076
(.0196 ±.003)
10 9
8
7 6
RECOMMENDED SOLDER PAD LAYOUT
REF
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
4.90 ±0.152
(.193 ±.006)
DETAIL “A”
0° – 6° TYP
0.254
(.010)
1
2
3
4 5
GAUGE PLANE
0.53 ±0.152
(.021 ±.006)
0.86
(.034)
REF
1.10
(.043)
MAX
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.17 – 0.27
(.007 – .011)
TYP
0.1016 ±0.0508
(.004 ±.002)
0.50
(.0197)
BSC
MSOP (MSE) 0213 REV I
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD
SHALL NOT EXCEED 0.254mm (.010") PER SIDE.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
13
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
For more information www.analog.com
LTC3290
TYPICAL APPLICATION
ꢈ0ꢋꢌ
VOUT, VIN vs Time
ꢈꢋꢌ
ꢀ
ꢐꢎꢄ
ꢔꢇ
ꢔꢘ
ꢀ
ꢀ
ꢀ
ꢄꢀ ꢇ ꢈ0ꢀꢉ
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢁꢂꢃ
ꢀ
ꢌꢍ
ꢈ0ꢋꢌ
ꢈ0ꢋꢌ
ꢀ
ꢅꢎꢏ
ꢓꢃꢔꢕꢖꢗ0
ꢈꢊ
ꢏꢆ
ꢀ
ꢎꢏꢃ
ꢌꢐ
0ꢀ
ꢈꢖꢀ
ꢀ
ꢚꢂꢛ
ꢁꢂꢃ0 ꢄꢅ0ꢂꢆ
ꢇ00ꢈꢉꢊꢋꢌꢀ
ꢈ00ꢍ
ꢀ
ꢀ
ꢀ
ꢑ ꢒꢂꢀ
ꢅꢎꢏ
ꢐꢅꢚꢎ
ꢙꢑꢁꢁꢒ
Rꢅꢓꢔ ꢕRꢐꢓ 0ꢀ ꢄꢐ ꢇ0ꢀ
ꢌꢍ
ꢐꢎꢄ
ꢐꢎꢄ
ꢑꢆꢒ
ꢑ ꢀ ꢖ ꢒ0ꢀ
ꢜ.ꢝꢋꢌ
ꢌꢍ
ꢕꢖꢗ0 ꢃꢚ0ꢖ
ꢌ
ꢑ ꢒꢈꢅ ꢗꢕRꢐꢓ ꢀ
ꢄꢐ ꢀ ꢘ
ꢐꢎꢄ ꢌꢍ
ꢅꢙꢙ ꢚꢛꢅꢍꢍꢜꢙꢝ ꢒ0ꢀꢊꢋꢌꢀ
Figure 10. (VIN + 10V) Tracking Power Supply
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LTC3255
Wide V Range, Dual Output 350mA Step-Down Charge
V : 5.5V to 38V, V : 5V/3.3V, I
= 100mA/250mA, MSE16
IN
IN
OUT
OUT
Pump with Watchdog Timer
Package
Wide V Range, Low Noise, 250mA Buck-Boost Charge
V : 2.7V to 38V, V : 2.5V to 5V/3.3V/5V, I
= 250mA, DFN12
OUT
IN
IN
OUT
Pump
and MSE12 Packages
Wide V Range, Fault Protected, 50mA Step-Down Charge V : 4V to 48V, V : 2.4V to 12.5V, I = 50mA, DFN10 and
OUT
IN
IN
OUT
Pump
MSE10 Packages
Rev. 0
08/19
www.analog.com
ANALOG DEVICES, INC. 2019
14
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