19-4348; Rev 0; 10/08
KIT
ATION
EVALU
BLE
AVAILA
Internal-Switch Boost Regulator with Integrated
7-Channel Driver, VCOM Calibrator, Op Amp, and LDO
General Description
The MAX17094 includes a high-performance step-up
regulator, a 250mA low-dropout (LDO) linear regulator, a
high-speed operational amplifier, a digitally adjustable
VCOM calibration device with nonvolatile memory and
I
2
C interface, and seven integrated high-voltage level
shifters. The device is optimized for thin-film transistor
(TFT) liquid-crystal display (LCD) applications.
The step-up DC-DC converter is a current-mode regu-
lator that provides the regulated supply voltage for
panel source driver ICs. The current-mode architecture
provides fast-transient responses to pulsed loads typi-
cal of source driver loads. The high switching frequen-
cy, which is programmable to any frequency between
450kHz to 1.2MHz with a single resistor, allows the use
of ultra-small inductors and ceramic capacitors. The
step-up regulator’s soft-start time is controlled by an
internal 10ms digital timer that requires no external
components; or if desired, the soft-start time can be
adjusted by adding a single external capacitor.
The low-voltage LDO linear regulator can provide at
least 250mA. The output voltage is accurate within
±2%.
The high-voltage, level-shifting scan driver is designed
to work with panels that incorporate row drivers on the
panel glass. Its seven outputs swing from +30V to -10V
and can swiftly drive capacitive loads.
The high-performance op amp is designed to drive the
LCD backplane and features 20MHz bandwidth, 45V/µs
slew rate, and 150mA output currents.
The programmable VCOM calibrator is externally
attached to the VCOM amplifier’s resistive voltage-
divider and sinks a programmable current to adjust the
VCOM voltage level. An internal 7-bit digital-to-analog
converter (DAC) controls the sink current. The DAC is
ratiometric relative to AVDD and is guaranteed monoto-
nic over all operating conditions. The calibrator
includes a nonvolatile memory device (IVR) to store the
desired VCOM voltage level. The 2-wire I
2
C interface
simplifies production equipment.
The MAX17094 is available in a 48-pin, 6mm x 6mm
TQFN package with a maximum thickness of 0.8mm for
thin LCD panels.
Features
o
1.8V to 5.5V IN Supply Voltage Range
o
450kHz to 1.2MHz Adjustable Frequency Current-
Mode Step-Up Regulator
Fast-Transient Response
Integrated 14V, 2.5A, 150mΩ MOSFET
High Efficiency (> 85%)
o
Low-Dropout Linear Regulator
High-Accuracy Output Voltage (2.0%)
Internal Digital Soft-Start
o
High-Performance Operational Amplifier
200mA Output Short-Circuit Current
45V/µs Slew Rate
20MHz, -3dB Bandwidth
Rail-to-Rail Inputs and Outputs
o
High-Voltage Drivers
+30V to -10V Outputs
2
C Programmable VCOM Calibrator
o
I
7-Bit Adjustable Current-Sink Output
Nonvolatile IVR Memory
o
Thermal-Overload Protection
MAX17094
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX17094ETM+
-40°C to +85°C
48 TQFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configuration
BGND
AVDD
GON1
GON2
GOFF
GND
GND
OUT
NEG
POS
SET
TOP VIEW
36 35 34 33 32 31 30 29 28 27 26 25
FB
PGND
PGND
LX
LX
FREQ
EN
IN
SENSE
COMP
AGND
VL
37
38
39
40
41
42
43
44
45
46
47
48
1
LIN
2
LOUT
3
FBL
4
GND
5
ADDR0
6
ADDR1
7
SCL
8
SDA
9
A8
10 11 12
A7
A6
A5
*EP
24
23
22
21
20
19
Y8
Y7
Y6
Y5
Y4
Y3
Y2
YDCHG
SS
A2
A3
A4
VCOM
MAX17094
18
17
16
15
14
13
Applications
Notebook Computer Displays
*EP = EXPOSED PAD.
TQFN
________________________________________________________________
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 Driver, VCOM Calibrator, Op Amp, and LDO
MAX17094
ABSOLUTE MAXIMUM RATINGS
IN, LIN, LOUT, EN, VL, A2–A8,
SCL, SDA, ADDR0, ADDR1.. ............................-0.3V to +7.5V
COMP, FB, SENSE, SS to AGND ............…-0.3V to (VVL + 0.3V)
FBL to AGND.............................................-0.3V to (VLIN + 0.3V)
FREQ, SET to GND .....................................-0.3V to (VVL + 0.3V)
LX to PGND ............................................................-0.3V to +16V
AVDD to BGND ......................................................-0.3V to +16V
POS, NEG, OUT, VCOM to BGND ......-0.3V to (V
AVDD
to +0.3V)
POS to NEG.................................................................-6V to +6V
GND, PGND, BGND to AGND...............................-0.3V to +0.3V
GON1, GON2 to GND ............................................-0.3V to +35V
GOFF to GND ........................................................-14V to + 0.3V
Y2–Y6, YDCHG to GND ..........(V
GOFF
- 0.3V) to (V
GON1
+ 0.3V)
Y7, Y8 to GND .........................(V
GOFF
- 0.3V) to (V
GON2
+ 0.3V)
LX, PGND RMS Current .......................................................2.4A
Y1–Y7, YDCHG RMS Current..............................................33mA
GON1 RMS Current ...........................................................46mA
GON2 RMS Current ...........................................................83mA
GOFF RMS Current ..........................................................115mA
Continuous Power Dissipation (TA = +70°C)
48-Pin, 6mm x 6mm TQFN
(derate 20mW/°C above +70°C).. .............................2963mW
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
IN
= V
LIN
= V
EN
= +3.3V, circuit of Figure 2, V
MAIN
= 8V, V
GON1
= V
GON2
= 21V, V
GOFF
= -6.5V,
T
A
= 0°C to +85°C.
Typical val-
ues are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
GENERAL
IN Input-Voltage Range
IN Shutdown Current
IN Quiescent
IN Undervoltage Lockout
Thermal Shutdown
VL Output Voltage
VL Maximum Output Current
LINEAR REGULATOR
LIN Input-Voltage Range
LIN Quiescent Current
Dropout Voltage
FBL Regulation Voltage
FBL Input Bias Current
LOUT Maximum Output Current
LOUT Load Regulation
Soft-Start Period
V
LOUT
< V
LIN
No load
I
LOUT
= 250mA, V
LIN
- V
LOUT
I
LOUT
= 100mA
V
FBL
= 0.618V, T
A
= +25°C
V
FBL
= 0.5V
V
LIN
= 5V, 5mA < I
OUT
< 250mA, not in dropout
7-bit voltage ramp
605
-50
250
1
3
618
1.8
5.5
2
0.3
631
+50
V
mA
V
mV
nA
mA
%
ms
VL = 3.7V
EN = 0
V
IN
= 3V, V
FB
= 1.5V, not switching, V
L
> 2.3V
V
IN
rising, typical hysteresis 200mV
Rising edge, typical hysteresis 15°C
3.8
10
1.30
160
4.0
4.2
1.8
30
5.5
100
100
1.75
V
μA
μA
V
°C
V
mA
CONDITIONS
MIN
TYP
MAX
UNITS
BOOTSTRAP LINEAR REGULATOR (VL)
2
_______________________________________________________________________________________
Internal-Switch Boost Regulator with Integrated
7-Channel Driver, VCOM Calibrator, Op Amp, and LDO
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
LIN
= V
EN
= +3.3V, circuit of Figure 2, V
MAIN
= 8V, V
GON1
= V
GON2
= 21V, V
GOFF
= -6.5V,
T
A
= 0°C to +85°C.
Typical val-
ues are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
STEP-UP DC-DC CONVERTER
R
FREQ
= 80k
Switching Frequency
Oscillator Maximum Duty Cycle
FB Regulation Voltage
FB Load Regulation
FB Line Regulation
FB Input Bias Current
FB Transconductance
FB Voltage Gain
LX On-Resistance
LX Leakage Current
LX Current Limit
Current-Sense Transresistance
Soft-Start Period
SS Output Current
HIGH-VOLTAGE DRIVER BLOCK
GON1, GON2 Input Voltage
GOFF Input Voltage
GOFF Supply Current
GON1, GON2 Supply Current
Output-Voltage Low
(Y2–Y8, YDCHG)
Output-Voltage High
(Y2–Y8, YDCHG)
Rise Time (Y2–Y8)
Fall Time (Y2–Y8)
Propagation Delay High-to-Low
Transition (Y2–Y8)
Propagation Delay Low-to-High
Transition (Y2–Y8)
Operating Frequency
A2–A8 = AGND, no load
A2–A8 = AGND, no load
I
OUT
= 10mA
I
OUT
= 10mA
C
LOAD
= 100pF, V
GON1
= V
GON2
= 30V, V
GOFF
= -10V
(Note 1)
C
LOAD
= 100pF, V
GON1
= V
GON2
= 30V, V
GOFF
= -10V
(Note 1)
C
LOAD
= 100pF
(Note 1)
C
LOAD
= 100pF
(Note 1)
C
LOAD
= 100pF
V
GON_
-1
12
-10
120
265
V
GOFF
+ 0.3
V
GON_
- 0.3
16
16
80
80
32
32
125
125
50
30
-4
250
430
V
GOFF
+1
V
V
μA
μA
V
V
ns
ns
ns
ns
kHz
C
SS
< 200pF
3.5
0 < I
MAIN
< 200mA, transient only
V
IN
= 1.8V to 5.5V
V
FB
= 1.3V
I = 5μA at COMP
FB to COMP
I
LX
= 200mA
V
LX
= 16V
Duty cycle = 65%
2
0.15
-0.15
25
75
f (MHz) = 0.015 x R
FREQ
(k )
R
FREQ
= 30k
R
FREQ
= unconnected
1000
382
570
88
1.216
1200
450
600
92
1.235
-1
-0.08
75
160
2400
150
10
2.5
0.3
10
5
6.5
250
20
3
0.45
+0.15
150
280
1500
518
690
96
1.254
%
V
%
%/V
nA
μS
V/V
m
μA
A
V/A
ms
μA
kHz
CONDITIONS
MIN
TYP
MAX
UNITS
MAX17094
_______________________________________________________________________________________
3
Internal-Switch Boost Regulator with Integrated
7-Channel Driver, VCOM Calibrator, Op Amp, and LDO
MAX17094
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
LIN
= V
EN
= +3.3V, circuit of Figure 2, V
MAIN
= 8V, V
GON1
= V
GON2
= 21V, V
GOFF
= -6.5V,
T
A
= 0°C to +85°C.
Typical values
are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
OPERATIONAL AMPLIFIER
AVDD Supply Voltage Range
AVDD Overvoltage Threshold
AVDD Input Supply Current
Input Offset Voltage
Input Bias Current
Input Common-Mode
Voltage Range
Input Common-Mode
Rejection Ratio
Output-Voltage Swing High
Output-Voltage Swing Low
Large-Signal Voltage Gain
Slew Rate
-3dB Bandwidth
Short-Circuit Current
CONTROL INPUTS
Logic-Input Voltage Low
(A2–A8, EN)
Logic-Input Voltage High
(A2–A8, EN)
Logic-Input Bias Current (EN)
INPUT-VOLTAGE DETECTOR
SENSE Voltage Range
SENSE Bias Current
SENSE Threshold Voltage
GON2 Calibrating Threshold
GON2 Input-Voltage Range
SET Voltage Resolution
SET Differential Nonlinearity
SET Zero-Scale Error
0 < V
SENSE
< V
L
, T
A
= +25°C
Falling edge
Rising edge, 230mV hysteresis
-1
1.200
7
11
7
-1
-1
+1
+1
+3
1.235
8.5
V
VL
+1
1.270
10.5
30
V
μA
V
V
V
Bits
LSB
LSB
1.8V < V
IN
< 5.5V
1.8V < V
IN
< 5.5V
1.6
-1
-1
+1
+1
0.8
V
V
μA
μA
Short to V
AVDD
- 3V sourcing
Short to 3V sinking
200
200
I
OUT
= 50mA
I
OUT
= -50mA
V
OUT
= 1V to V
AVDD
- 1V
80
45
20
V
AVDD
-
300
300
Rising edge, 400mV hysteresis
FB = 1.1V, buffer configuration, V
POS
= V
AVDD
/2, no load
V
NEG
, V
POS
= V
AVDD
/2, T
A
= +25°C
V
NEG
, V
POS
= V
AVDD
/2, T
A
= +25°C
-12
-50
0
80
6
14.1
15
5
14
15.9
10
+12
+50
V
AVDD
V
V
mA
mV
nA
V
dB
mV
mV
dB
V/μs
MHz
mA
CONDITIONS
MIN
TYP
MAX
UNITS
Logic-Input Bias Current (A2–A8) 0 < A
X
< V
IN
, T
A
= +25°C
0 < V
EN
< V
IN
, T
A
= +25°C
PROGRAMMABLE VCOM CALIBRATOR
4
_______________________________________________________________________________________
Internal-Switch Boost Regulator with Integrated
7-Channel Driver, VCOM Calibrator, Op Amp, and LDO
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
LIN
= V
EN
= +3.3V, circuit of Figure 2, V
MAIN
= 8V, V
GON1
= V
GON2
= 21V, V
GOFF
= -6.5V,
T
A
= 0°C to +85°C.
Typical values
are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
SET Full-Scale Error
SET Current
SET External Resistance
V
SET
/V
AVDD
Voltage Ratio
POS Settling Time
Memory Write Cycles
Memory Write Time
I
2
C INTERFACE
Logic-Input Low Voltage (V
IL
)
Logic-Input Low Voltage
Logic-Input High Voltage (V
IH
)
SDA Output Low Voltage
Logic-Input Current
SDA and SCL Input Capacitance
SCL Frequency (f
SCL
)
SCL High Time (t
HIGH
)
SCL Low Time (t
LOW
)
SDA and SCL Rise Time and
Fall (t
R
, t
F
)
START Condition Hold Time
(t
HD:STA
)
START Condition Setup Time
(t
SU:STA
)
Data Input Hold Time (t
HD:DAT
)
Data Input Setup Time (t
SU:DAT
)
STOP Condition Setup Time
(t
SU:STO
)
Bus Free Time (t
BUF
)
SDA Capacitive Loading (Cb)
Input Filter Spike Suppression
(Note 2)
SDA, SCL, not tested
Cb = total capacitance of bus line in pF (Note 1)
10% of SDA to 90% of SCL
SDA, SCL
ADDR0_ADDR1
SDA, SCL, ADDR0, ADDR1
I
SDA
= -3mA sink
SDA, SCL, ADDR0, ADDR1, T
A
= +25°C
(Note 1)
DC
600
1300
20 + 0.1
x Cb
600
600
50
100
600
1300
400
50
300
0.7 x
V
IN
0
-1
5
0.4
+1
10
400
0.3 x
V
IN
0.2 x
V
IN
V
V
V
V
μA
pF
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
ns
R
FREQ
= unconnected
To GND, V
AVDD
= 14V
To GND, V
AVDD
= 6V
DAC zero scale
To ±0.5 LSB error band
30
150
8.5
2.5
0.05
20
CONDITIONS
MIN
-4
TYP
MAX
+5
120
170
50
UNITS
LSB
μA
k
V/V
μs
Times
ms
MAX17094
_______________________________________________________________________________________
5
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