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MAX17117
User Manual
22 pgs1.68 Mb0

Rainbow Electronics MAX17117 User Manual

19-5241; Rev 0; 4/10
EVALUATION KIT
AVAILABLE
Internal-Switch Boost Regulator with Integrated
7-Channel Scan Driver, Op Amp, and LDO
General Description
The MAX17117 includes a high-performance step-up regulator, a 350mA low-dropout (LDO) linear regulator, a high-speed operational amplifier, and a high-voltage level-shifting scan driver with gate-shading control. The device is optimized for thin-film transistor (TFT) liquid­crystal display (LCD) applications.
The step-up DC-DC converter provides the regulated supply voltage for panel source-driver ICs. The high
1.2MHz switching frequency allows the use of ultra-small inductors and ceramic capacitors. The current-mode control architecture provides a fast-transient response to pulsed loads typical of source driver loads. The step-up regulator features an adjustable soft-start and an adjust­able cycle-by-cycle current limit.
The high-current operational amplifier is designed to drive the LCD backplane (VCOM). The amplifier features high output current (Q200mA typ), fast slew rate (40V/Fs typ), wide bandwidth (16MHz typ), and rail-to-rail inputs and outputs.
0.8I pass element and can provide at least 350mA. The output voltage is accurate within Q1%.
The high-voltage, level-shifting scan driver with gate­shading control is designed to drive the TFT panel gate drivers. Its seven outputs swing 40V (maximum) between +35V (maximum) and -15V (minimum) and can swiftly drive capacitive loads.
The MAX17117 is available in a 32-pin, 5mm x 5mm, thin QFN package with a maximum thickness of 0.8mm for thin LCD panels.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX17117ETJ+ -40NC to +85NC 32 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
Applications
Notebook Computer Displays
Features
S 2.3V to 5.5V IN Supply-Voltage Range S 1.2MHz Current-Mode Step-Up Regulator
Fast-Transient Response High-Accuracy Reference (1%) Integrated 16V, 2A, 200mI MOSFET High Efficiency (> 85%) Adjustable Cycle-by-Cycle Current Limit
S High-Performance Operational Amplifier
200mA Output Short-Circuit Current 40V/µs Slew Rate 16MHz, -3dB Bandwidth Low-Dropout Linear Regulator High-Accuracy Output Voltage (1.0%)
S High-Voltage Drivers with Scan Logic
+35V to -15V Outputs 40V Maximum Voltage Swing
Gate-Shading Control S Thermal-Overload Protection S 32-Pin, 5mm x 5mm, Thin QFN Package
Simplified Operating Circuit
PANEL
V
GHON
V
MAIN
TO VCOM BACKPLANE
V
VGL
V
IN
IN
LINEAR
GATE-
TIMING
SETUP
CONTROLLER
MAX17117
OP
ENA
LDOADJ
REGULATOR
V
SYSTEM
LDOO
DTS
SHADING
CONTROL
GHON
GHON
ST
CK1
CK3
CK5
SCAN DRIVER AND
GATE-SHADING
CONTROL LOGIC
CK2
CK4
CK6
VGL
V
VGL
V
LOGIC
LX
PGND
FB
COMP
SS
AGND (EP)
OPAS
OUT
POS
STH
CKH1
CKH3
CKH5
S1
S3
S5
RO
CKH2
CKH4
CKH6
S2
S4
S6
RE
VGLC
MAX17117
_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Internal-Switch Boost Regulator with Integrated 7-Channel Scan Driver, Op Amp, and LDO
ABSOLUTE MAXIMUM RATINGS
IN, ENA, FB, COMP, SS, DTS, LDOADJ, ST,
CK1–CK6, LDOO to AGND ...............................-0.3V to +7.5V
PGND to AGND .................................................... -0.3V to +0.3V
LX, OPAS to PGND ...............................................-0.3V to +18V
GHON to PGND ....................................................-0.3V to +45V
VGL to PGND ....................................................... -20V to +0.3V
GHON to VGL .................................................................... +45V
STH, CKH1–CKH6, VGLC, RO,
RE to VGL .........................................-0.3V to (V
MAX17117
OUT, POS to PGND ..............................-0.3V to (V
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and 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 affect device reliability.
GHON
OPAS
+ 0.3V)
+ 0.3V)
ELECTRICAL CHARACTERISTICS
(VIN = +3V, Circuit of Figure 1, V noted. Typical values are at TA = +25NC.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
IN Input Voltage Range 2.3 5.5 V
IN Undervoltage-Lockout Threshold
IN Quiescent Current
IN Standby Current V GHON Standby Current V OPAS Standby Current V Thermal Shutdown Temperature rising 145 170
STEP-UP REGULATOR
Output Voltage Range V OPAS Overvoltage Threshold OPAS rising 16.5 17 18 V Operating Frequency 1000 1200 1400 kHz Oscillator Maximum Duty Cycle 91 94 97 % FB Regulation Voltage No load 1.227 1.240 1.252 V FB Fault-Trip Level Falling edge 1.05 1.10 1.15 V Fault-Trigger Delay 160 ms FB Load Regulation 0 < I FB Line Regulation FB Input-Bias Current FB Transconductance LX Current Limit LX On-Resistance ILX = 1A 200 500 LX Input-Bias Current Current-Sense Transresistance 0.10 0.20 0.30 V/A Soft-Start Pullup Current 2 4 6
= +8.5V, V
OPAS
VIN rising, typical hysteresis = 150mV 1.80 2.00 2.20 V
VFB = 1.3V, LX not switching 1.0 2.5 VFB = 1.2V, LX switching 2.5 5
= V
ENA
ENA
ENA
VIN = 2.5V to 5.5V, TA = +25NC VFB = 1.24V, TA = +25NC DI
R
ENA
V
LX
VGL
= V
VGL
= V
VGL
< full load -0.2 %
LOAD
= Q2.5FA, FB = COMP
COMP
= 10kW, duty cycle = 60%
= 13.5V, TA = +25NC
= +24V, V
GHON
= 0V, VIN = 5.5V, V = 0V, VIN = 5.5V, V = 0V, VIN = 5.5V, V
GHON and VGL RMS Current Rating ..................................0.8A
VGLC, STH, and CKH1–CKH6 RMS Current Rating ...........0.8A
LX, PGND RMS Current Rating ............................................1.6A
Continuous Power Dissipation (TA = +70NC)
32-Pin TQFN (derate 24.9mW/NC above +70NC) .......1990mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range ............................ -65NC to +160NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
= -6.2V, VST = VCK_ = 0V, TA = 0NC to +85NC, unless otherwise
VGL
= 4V 0.7 2 mA
GHON
= 4V 100 200
GHON
= 4V 20 50
GHON
IN
0.1 0.25 %/V 65 200 nA
75 160 280
1.6 2 2.4 A
10 20
15 V
mA
FA FA NC
FS
mI
FA
FA
2 ______________________________________________________________________________________
Internal-Switch Boost Regulator with Integrated
7-Channel Scan Driver, Op Amp, and LDO
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3V, Circuit of Figure 1, V noted. Typical values are at TA = +25NC.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
VCOM BUFFER
OPAS Voltage Range 5 15 V OPAS Supply Current V
OUT Voltage Swing High I
OUT Voltage Swing Low I
OUT Short-Circuit Current
POS Input-Bias Current POS Input-Offset Voltage V Gain-Bandwidth Product 8 MHz
-3dB Bandwidth
Slew Rate
HIGH-VOLTAGE SCAN DRIVER
GHON Voltage Range 12 35 V VGL Voltage Range -15 -3 V GHON-to-VGL Voltage Range V GHON Supply Current CK1 through CK6 and ST low 350 550 VGL Supply Current CK1 through CK6 and ST low -500 -300 Output Impedance Low STH, CKH_, VGLC, I Output Impedance High STH, CKH_, VGLC, I
Gate-Shading Switch Resistance
RO, RE Resistance Range 100
Propagation Delay from ST Rising Edge to STH Rising Edge
Propagation Delay from ST Falling Edge to STH Falling Edge
Propagation Delay from CK_ Rising Edge to CKH_ Rising Edge
Propagation Delay from CK_ Falling Edge to CKH_ Falling Edge
STH, VGLC, CKH_ Rise Time
STH, VGLC, CKH_ Fall Time
STH, CKH_ Operating Frequency Range
= +8.5V, V
OPAS
= V
POS
OUT
OUT
OPAS
= 5mA
= 5mA 50 100 mV Sourcing, short to V Sinking, short to V V
= V
POS
OUT
R
LOAD
OPAS
= V
OPAS
= 10kI, C
5V pulse applied to POS, OUT measured from 10% to 90%
- V
GHON
GHON
= +24V, V
= -6.2V, VST = VCK_ = 0V, TA = 0NC to +85NC, unless otherwise
VGL
/2, no load 0.8 1.2 mA
/2 - 1V 100 200
OPAS
/2 + 1V 100 200
OPAS
/2, TA = +25NC
V
OPAS
- 100
V
OPAS
- 50
-50 +50 nA
/2 -15 +15 mV
LOAD
= 10pF
16 MHz
10 40
VGL
= -20mA 80
OUT
= +20mA 80
OUT
CKH1, CKH3, CKH5, IRE = 10mA 100 CKH2, CKH4, CKH6, IRO = 10mA 100
C
= 100pF, R
LOAD
C
= 100pF, R
LOAD
C
= 100pF, R
LOAD
C
= 100pF, R
LOAD
C
= 5nF, R
LOAD
V
= -10V; measured from 10% to 90%
VGL
C
= 5nF, R
LOAD
V
= -10V; measured from 10% to 90%
VGL
C
= 5nF, R
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
= 0I; V
= 0I; V
= 0I
= 0I
= 0I
= 0I
= 0I
GHON
GHON
= 30V,
= 30V,
100 200 ns
100 200 ns
100 200 ns
100 200 ns
0.5 1
0.5 1
mV
mA
V/Fs
40 V
FA FA
I
I
I
I
Fs
Fs
100 kHz
MAX17117
_______________________________________________________________________________________ 3
Internal-Switch Boost Regulator with Integrated 7-Channel Scan Driver, Op Amp, and LDO
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3V, Circuit of Figure 1, V noted. Typical values are at TA = +25NC.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
GATE-SHADING TIMING CONTROL
Gate-Shading Detection Threshold
Gate-Shading Detection Current V
MAX17117
DTS Switch Resistance V DTS Rising Edge Threshold 1.215 1.240 1.265 V DTS Falling Edge Threshold 100 150 mV
LDO
LDOO Output Voltage Range 1.8 V Dropout Voltage VIN = 3.3V, V LDOO Line Regulation VIN = 2.8V to 5.5V, V LDOO Load Regulation V LDOO Current Limit V LDOADJ Feedback Voltage 1.227 1.240 1.252 V LDOADJ Input-Bias Current
DIGITAL INPUTS
ST, CK_ Input High Level 1.8V < V
ST, CK_ Input Low Level 1.8V < V
ENA Input Logic-High Level
ENA Input Logic-Low Level
ENA Resistor Range 0 200
= +8.5V, V
OPAS
DTS falling 100 150 mV
= 0.5V 5 10 15 µA
DTS
= 1.3V, I
DTS
= 2.5V, I
LDOO
= 1.0V 0.4 0.62 0.8 A
LDOADJ
V
1.8V < V
V
1.8V < V
V
= 1.3V, TA = +25NC
LDOADJ
LDOO
LDOO
LDOO
> 3.0V 2.1 V
LDOO
LDOO
> 3.0V 0.8 V
LDOO
= +24V, V
GHON
= 1mA 10 50
DTS
= 1.1V, I
LDOADJ
LDOO
= 1mA to 300mA 0.2 0.5 %/V
LDOO
< 5.5V
< 5.5V
< 3.0V
< 3.0V
= -6.2V, VST = VCK_ = 0V, TA = 0NC to +85NC, unless otherwise
VGL
= 350mA 300 500 mV
LDOO
= 2.5V, I
= 100mA 0.1 0.3 %/V
LDOO
0.7 x
V
LDOO
0.7 x
V
LDOO
IN
100 200 nA
0.3 x
V
LDOO
0.3 x
V
LDOO
I
V
V
V
V
V
kI
ELECTRICAL CHARACTERISTICS
(VIN = +3V, Circuit of Figure 1, V erwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
IN Input Voltage Range 2.3 5.5 V
IN Undervoltage-Lockout Threshold
IN Quiescent Current
IN Standby Current V GHON Standby Current V OPAS Standby Current V Thermal Shutdown Temperature rising 145
4 ______________________________________________________________________________________
= +8.5V, V
OPAS
VIN rising, typical hysteresis = 150mV 1.80 2.20 V
VFB = 1.3V, LX not switching 2.5 VFB = 1.2V, LX switching 5
= V
ENA
ENA
ENA
= V = V
VGL
VGL
VGL
= +24V, V
GHON
= 0V, VIN = 5.5V, V = 0V, VIN = 5.5V, V = 0V, VIN = 5.5V, V
VGL
= -6.2V, VST = V
= 4V 2 mA
GHON
= 4V 160
GHON
= 4V 50
GHON
= 0V, TA = -40NC to +85NC, unless oth-
CK_
mA
FA FA NC
Internal-Switch Boost Regulator with Integrated
7-Channel Scan Driver, Op Amp, and LDO
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3V, Circuit of Figure 1, V erwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
STEP-UP REGULATOR
Output Voltage Range V OPAS Overvoltage Threshold OPAS rising 16.5 18 V Operating Frequency 1000 1400 kHz Oscillator Maximum Duty Cycle 91 97 % FB Regulation Voltage No load 1.227 1.252 V FB Fault-Trip Level Falling edge 1.05 1.15 V FB Line Regulation FB Input-Bias Current FB Transconductance LX Current Limit VFB = 1.2V, duty cycle = 60% 1.6 2.4 A LX On-Resistance ILX = 1A 500 LX Input-Bias Current Current-Sense Transresistance 0.10 0.30 V/A Soft-Start Pullup Current 2 6
VCOM BUFFER
OPAS Voltage Range 5 15 V OPAS Supply Current V
OUT Voltage Swing High I
OUT Voltage Swing Low I
OUT Short-Circuit Current
POS Input-Bias Current POS Input-Offset Voltage V
Slew Rate
HIGH-VOLTAGE SCAN DRIVER
GHON Voltage Range 12 35 V VGL Voltage Range -15 -3 V GHON-to-VGL Voltage Range V GHON Supply Current CK1 through CK6 and ST low 550 VGL Supply Current CK1 through CK6 and ST low -500 Output Impedance Low STH, CKH_, VGLC, I Output Impedance High STH, CKH_, VGLC, I
Gate-Shading Switch Resistance
RO, RE Resistance Range 100
Propagation Delay from ST Rising Edge to STH Rising Edge
= +8.5V, V
OPAS
VIN = 2.5V to 5.5V, TA = +25NC VFB = 1.3V, TA = +25NC DI
= Q2.5FA, FB = COMP
COMP
V
= 13.5V, TA = +25NC
LX
= V
POS
OUT
OUT
Sourcing, short to V Sinking, short to V V
POS
OUT
5V pulse applied to POS, OUT measured from 10% to 90%
GHON
CKH1, CKH3, CKH5, IRE = 10mA 100 CKH2, CKH4, CKH6, IRO = 10mA 100
C
OPAS
= 5mA
= 5mA 100 mV
= V
OPAS
= V
OPAS
- V
VGL
= 100pF, R
LOAD
= +24V, V
GHON
/2, no load 1.2 mA
/2 - 1V 100
OPAS
/2 + 1V 100
OPAS
/2, TA = +25NC
/2 -15 +15 mV
= -20mA 80
OUT
= +20mA 80
OUT
= 0I
LOAD
= -6.2V, VST = V
VGL
= 0V, TA = -40NC to +85NC, unless oth-
CK_
IN
75 280
V
OPAS
- 100
-50 +50 nA
10
15 V
0.3 %/V
200 nA
FS
mI
20
40 V
200 ns
FA
FA
mV
mA
V/Fs
FA FA
I
I
I
I
MAX17117
_______________________________________________________________________________________ 5
Internal-Switch Boost Regulator with Integrated 7-Channel Scan Driver, Op Amp, and LDO
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3V, Circuit of Figure 1, V erwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Propagation Delay from ST Falling Edge to STH Falling Edge
Propagation Delay from CK_ Rising Edge to CKH_ Rising Edge
MAX17117
Propagation Delay from CK_ Falling Edge to CKH_ Falling Edge
STH, VGLC, CKH_ Rise Time
STH, VGLC, CKH_ Fall Time
STH, CKH_ Operating Frequency Range
GATE-SHADING TIMING CONTROL
Gate-Shutdown Detection Threshold
Gate-Shutdown Detection Current V DTS Switch Resistance V DTS Rising Edge Threshold 1.210 1.265 V DTS Falling Edge Threshold 150 mV
LDO
LDOO Output Voltage Range 1.8 V Dropout Voltage VIN = 3.3V, V LDOO Line Regulation VIN = 2.8V to 5.5V, V LDOO Load Regulation V LDOO Current Limit V LDOADJ Feedback Voltage 1.227 1.252 V LDOADJ Input-Bias Current
DIGITAL INPUTS
ST, CK_ Input High Level 1.8V < V
ST, CK_ Input Low Level 1.8V < V
ENA Input Logic-High Level
ENA Input Logic-Low Level
ENA Resistor Range 0 200
OPAS
C
C
C
C V
C V
C
= +8.5V, V
= 100pF, R
LOAD
= 100pF, R
LOAD
= 100pF, R
LOAD
= 5nF, R
LOAD
= -10V; measured from 10% to 90%
VGL
= 5nF, R
LOAD
= -10V; measured from 10% to 90%
VGL
= 5nF, R
LOAD
GHON
LOAD
LOAD
LOAD
= +24V, V
= 0I
LOAD
= 0I
LOAD
= 0I
LOAD
= 0I; V
= 0I; V
= 0I
= -6.2V, VST = V
VGL
= 30V,
GHON
= 30V,
GHON
= 0V, TA = -40NC to +85NC, unless oth-
CK_
200 ns
200 ns
200 ns
1
1
100 kHz
DTS falling 100 150 mV
= 0.5V 5 10 15 µA
DTS
= 1.3V, I
DTS
= 2.5V, I
LDOO
= 1.0V 0.4 0.8 A
LDOADJ
V
1.8V < V
V
1.8V < V
V
= 1.3V, TA = +25NC
LDOADJ
LDOO
LDOO
LDOO
> 3.0V 2.1
LDOO
LDOO
> 3.0V 0.8
LDOO
= 1mA 50
DTS
LDOADJ
LDOO
< 5.5V
= 1.1V, I
= 2.5V, I
LDOO
= 1mA to 300mA 0.5
= 350mA 500 mV
LDOO
= 100mA 0.3
LDOO
0.7 x
V
LDOO
< 5.5V
< 3.0V
0.7 x
V
LDOO
< 3.0V
IN
200 nA
0.3 x
V
LDOO
0.3 x
V
LDOO
Fs
Fs
I
V
%/V %/V
V
V
V
V
kI
6 ______________________________________________________________________________________
Internal-Switch Boost Regulator with Integrated
7-Channel Scan Driver, Op Amp, and LDO
Typical Operating Characteristics
(T
= +25°C, unless otherwise noted.)
A
MAX17117
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT
100
V
= 5.0V
90
80
70
EFFICIENCY (%)
60
50
40
1 1000
IN
V
= 2.3V
IN
10010
LOAD CURRENT (mA)
STEP-UP CONVERTER PEAK INDUCTOR
CURRENT LIMIT vs. R
3.0
2.5
2.0
1.5
V
= 3.3V
IN
= 8.5V
V
1.0
PEAK INDUCTOR CURRENT LIMIT (A)
MAIN
= 2.5V
V
LDO
L1 = 10µH
0.5 0 250
V
V
MAIN
R
IN
ENA
= 3.0V
= 8.5V
(kI)
0.25
MAX17117 toc01
0.20
0.15
0.10
LINE REGULATION (%)
0.05
ENA
20015010050
STEP-UP REGULATOR LINE REGULATION
vs. INPUT VOLTAGE
I
= 200mA
MAIN
I
= 0mA
MAIN
0
2.3 5.5 IN VOLTAGE (V)
5.14.74.33.93.53.12.7
STEP-UP REGULATOR LOAD-TRANSIENT
MAX17117 toc04
0V
0A
0V
20mA
STEP-UP REGULATOR OUTPUT LOAD
REGULATION vs. LOAD CURRENT
0.10
MAX17117 toc02
RESPONSE (20mA TO 300mA)
0
-0.10
-0.20
-0.30
LOAD-REGULATION ERROR (%)
-0.40
-0.50
LOAD CURRENT (mA)
MAX17117 toc05
100µs/div
V
IN
= 2.3V
V
V
LX
10V/div
INDUCTOR CURRENT
1A/div
V
MAIN (AC-COUPLED) 200mV/div
I
MAIN
200mA/div
L1 = 10µH R
COMP
C
COMP
V
= 5.0V
IN
= 3.0V
IN
100101 1000
= 56.2kI = 1000pF
MAX17117 toc03
STEP-UP REGULATOR PULSED
LOAD-TRANSIENT RESPONSE (20mA TO 1A)
0V
0A
0V
20mA
10µs/div
MAX17117 toc06
V
LX
10V/div
INDUCTOR CURRENT
500mA/div
V
MAIN (AC-COUPLED) 100mV/div
I
MAIN
1A/div
L1 = 10µH R
= 56.2kI
COMP
C
= 1000pF
COMP
LOAD-REGULATION ERROR (%)
LDO OUTPUT LOAD REGULATION
vs. LOAD CURRENT
0.10
0
-0.10
-0.20
-0.30
-0.40
-0.50
V
= 3.0V
IN
LOAD CURRENT (mA)
V
= 5.0V
IN
100101 1000
MAX17117 toc07
_______________________________________________________________________________________ 7
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