ZTP7192YH
2A, 18V, 1MHz, Synchronous Step-Down DC/DC Converter
FEATURES
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DESCRIPTION
The ZTP7192YH is a high-frequency, synchronous,
rectified, step-down, switch-mode converter with
internal power MOSFETs. It offers a very compact
solution to achieve a 2A continuous output current over
a wide input supply range, with excellent load and line
regulation. The ZTP7192YH has synchronous-mode
operation for higher efficiency over the output
current-load range.
Current-mode operation provides fast transient
response and eases loop stabilization.
Protection features include over-current protection and
thermal shutdown.
The ZTP7192YH requires a minimal number of readily
available, standard external components and is available
in space-saving TSOT23-6L package.
4.7V to 18V input voltage
Output adjustable from 0.6V to 15V
Output current up to 2A
Integrated 140mΩ/90mΩ power MOSFET switches
Shutdown current 3μA typical
Efficiency up to 95%
Fixed frequency 1MHz
Internal soft start
Over current protection and Hiccup
Over temperature protection
RoHS Compliant and 100% Lead (Pb) Free
APPLICATIONS
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Distributed power systems
Networking systems
FPGA, DSP, ASIC power supplies
Notebook computers
Green electronics or appliance
Pins Configuration
Top View
TSOT23-6L
BOOT 1
6 SW
5 IN
4 EN
ORDERING INFORMATION
PART
ZTP7192YH
PACKAGE
TSOT23-6L
RoHS
Yes
Ship, Quantity
Tape and Reel
GND 2
FB 3
Typical Application Circuit
Input
C1
10μF/25V
Ceramic
R4
100k
C7
0.1μF
4
5
IN
EN
C5 100nF
1
BOOT
SW 6
FB 3
L1
4.7μH
R1 20kΩ
Output
3.3V/2A
ZTP7192YH
GND
2
R5
R2
4.45kΩ
C2
10μF/6.3V
Ceramic x 2
Note: R5 and C7 are optional.
Details please see the DVT report.
DS-01
Copyright © ZillTek Technology Corp.
-1-
4F-3, No.5, Technology Rd., Science-Based
Industrial Park, Hsinchu 30078, Taiwan
Tel: (886) 3577 7509; Fax: (886) 3577 7390
Email: sales@zilltek.com
ZTP7192YH
Absolute Maximum Ratings
Supply Voltage V
IN
……………………………….... –0.3V to +19V
Switch Node V
SW
………………………………. –0.3V to V
IN
+0.3V
Boost V
BOOT
…………………………………… V
SW
–0.3V to V
SW
+6V
All Other Pins …………………………………………… –0.3V to +6V
Power Dissipation @25℃…………………………………… 1.2W
Junction Temperature ………………………………………. +150°C
Lead Temperature …………………………………………….. +260°C
Storage Temperature Range …………....... –65°C to +150°C
ESD, HBM ………………………………………………………………. 2KV
ESD, MM ……………………………………………………………… 200V
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.
Recommended Operating Conditions
Supply Voltage V
IN
……...…………...…….…………. 4.7V to 18V
Output Voltage V
OUT
……...…………...…….….. 0.6V to V
IN
–3V
Operating Temperature Range ……...…… –40°C to +125°C
Package Thermal Characteristics
TSOT23-6L:
Thermal Resistance, θ
JA
………………………………… 100°C/W
Thermal Resistance, θ
JC
……………………………………. 55°C/W
Pins Description
TSOT
23-6L
1
2
3
4
5
6
Symbol
BOOT
GND
FB
EN
IN
SW
Description
High-side gate drive boost input.
Ground.
Feedback input.
Enable input.
Power input.
Power switching output.
Electro-Static Discharge Sensitivity
This integrated circuit can be damaged by ESD.
It is recommended that all integrated circuits
be handled with proper precautions. Failure
to observe proper handling and installation procedures
can cause damage. ESD damage can range from subtle
performance degradation to complete device failure.
Functional Block Diagram
+
_
OVP
RAMP
Oscillator
Fosc1 or
Fosc2
CLK
1.2pF
500K
−
+
+
Σ
Current Sense
Amplifier
+
_
2
IN
5V
0.66V
FB
5
0.3V
+
_
1
BOOT
S Q
+
_
20K
47pF
M1
3
SW
M2
OVP
EN
IN<3.75V
4
GND
Soft
Start
0.6V
Error
Amplifier
Current
Comparator
R Q
1.2V
IN
Internal
Regulators
5V
EN
7
1.3V
_
+
Shutdown
Comparator
ZTP7192YH
DS-01
Copyright © ZillTek Technology Corp.
-2-
4F-3, No.5, Technology Rd., Science-Based
Industrial Park, Hsinchu 30078, Taiwan
Tel: (886) 3577 7509; Fax: (886) 3577 7390
Email: sales@zilltek.com
ZTP7192YH
Electrical Specifications
(T
A
= +25°C, V
IN
= +12V, unless otherwise noted.)
PARAMETER
Supply Voltage
Output Voltage
Shutdown Supply Current
Supply Current
Feedback Voltage
Feedback Over-voltage Threshold
Error Amplifier Voltage Gain *
High-Side Switch-On Resistance *
Low-side Switch-On Resistance *
High-Side Switch Leakage Current
Upper Switch Current Limit
Lower Switch Current Limit
Oscillation Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On Time *
EN Falling Threshold Voltage
EN Rising Threshold Voltage
Input Under Voltage Lockout Threshold
Input Under Voltage Lockout Threshold
Hysteresis
Soft-Start Period
Thermal Shutdown *
* Guaranteed by design, not tested.
Symbol
V
IN
V
OUT
V
EN
= 0V
V
EN
= 2.0V, V
FB
= 0.64V
4.7V ≤ V
IN
≤ 18V
TEST CONDITIONS
MIN
4.7
0.6
3
0.7
0.6
0.66
1000
140
90
TYP
MAX
18
15
6
0.612
UNIT
V
V
µA
mA
V
V
V/V
mΩ
mΩ
µA
A
A
MHz
KHz
%
ns
V
V
V
mV
ms
°C
V
FB
A
EA
R
DS(ON)1
R
DS(ON)2
0.588
V
EN
= 0V, V
SW
= 0V,
T
A
= +125°C
Minimum Duty Cycle
From Drain to Source
F
OSC1
F
OSC2
D
MAX
V
FB
= 0V
V
FB
= 0.5V
V
EN
Falling
V
EN
Rising
V
IN
Rising
10
3
0.9
100
3.6
0
1
125
90
120
1.12
1.22
3.5
240
1
150
1.1
150
DS-01
Copyright © ZillTek Technology Corp.
-3-
4F-3, No.5, Technology Rd., Science-Based
Industrial Park, Hsinchu 30078, Taiwan
Tel: (886) 3577 7509; Fax: (886) 3577 7390
Email: sales@zilltek.com
ZTP7192YH
Typical Characteristics
V
IN
= 12V, V
O
= 3.3V, L1 = 4.7μH, C1 = 10μF, C2 = 10μF x 2, T
A
= +25°C, unless otherwise noted.
Start UP & Inrush Current (12V => 3.3V, Load=2A)
Shut Down (12V => 3.3V, Load=2A)
Output Ripple (12V => 3.3V, Load=2A)
Output Ripple (12V => 3.3V, Load=1A)
Output Ripple (12V => 3.3V, Load=0A)
Dynamic Load (I
load
=0.2A_2A Vout=3.3V)
Short Circuit Protection
Efficiency
DS-01
Copyright © ZillTek Technology Corp.
-4-
4F-3, No.5, Technology Rd., Science-Based
Industrial Park, Hsinchu 30078, Taiwan
Tel: (886) 3577 7509; Fax: (886) 3577 7390
Email: sales@zilltek.com
ZTP7192YH
APPLICATION INFORMATION
Overview
The ZTP7192YH is a synchronous rectified, current-mode,
step-down regulator. It regulates input voltages from
4.7V to 18V down to an output voltage as low as 0.6V,
and supplies up to 2A of load current.
The ZTP7192YH uses current-mode control to regulate
the output voltage. The output voltage is measured at
FB through a resistive voltage divider and amplified
through the internal transconductance error amplifier.
The converter uses internal N-Channel MOSFET switches
to step-down the input voltage to the regulated output
voltage. Since the high side MOSFET requires a gate
voltage greater than the input voltage, a boost capacitor
connected between SW and BOOT is needed to drive
the high side gate. The boost capacitor is charged from
the internal 5V rail when SW is low.
When the ZTP7192YH FB pin exceeds 10% of the
nominal regulation voltage of 0.6V, the over voltage
comparator is tripped, forcing the high-side switch off.
EN:
Enable Input. EN is a digital input that turns the
regulator on or off. Drive EN high to turn on the
regulator, drive it low to turn it off. Pull up with 100kΩ
resistor for automatic startup.
Setting the Output Voltage
The external resistor divider sets the output voltage. The
feedback resistor R1 also sets the feedback-loop
bandwidth through the internal compensation capacitor
(see the Typical Application circuit). Choose R1 around
10kΩ, and R2 by:
R2 = R1 / (V
OUT
/0.6V – 1)
Use a network below for when V
OUT
is low.
FB
R2
R1
VOUT
Figure 1: Feedback Network.
Table 1 lists the recommended resistors value for
common output voltages.
V
OUT
(V)
1.05
1.2
1.8
2.5
3.3
5
R1 (KΩ)
95(1%)
90(1%)
70(1%)
46.7(1%)
20(1%)
41.4(1%)
R2 (KΩ)
126.7(1%)
90(1%)
35(1%)
14.7(1%)
4.4(1%)
5.6(1%)
Pins Description
BOOT:
High-Side Gate Drive Boost Input. BOOT supplies
the drive for the high-side N-Channel MOSFET switch.
Connect a 0.1μF or greater capacitor from SW to BOOT
to power the high side switch.
IN:
Power Input. IN supplies the power to the IC, as well
as the step-down converter switches. Drive IN with a
4.7V to 18V power source. Bypass IN to GND with a
suitably large capacitor to eliminate noise on the input
to the IC.
SW:
Power Switching Output. SW is the switching node
that supplies power to the output. Connect the output
LC filter from SW to the output load. Note that a
capacitor is required from SW to BOOT to power the
high-side switch.
GND:
Ground.
FB:
Feedback Input. FB senses the output voltage to
regulate that voltage. Drive FB with a resistive voltage
divider from the output voltage. The feedback threshold
is 0.6V.
Table 1: Resistor selection for common output voltages.
Inductor
The inductor is required to supply constant current to
the output load while being driven by the switched
input voltage. A larger value inductor will result in less
ripple current that will result in lower output ripple
voltage. However, the larger value inductor will have a
larger physical size, higher series resistance, and/or
lower saturation current. A good rule for determining
the inductance to use is to allow the peak-to-peak ripple
current in the inductor to be approximately 30% of the
maximum switch current limit. Also, make sure that the
peak inductor current is below the maximum switch
current limit. The inductance value can be calculated by:
DS-01
Copyright © ZillTek Technology Corp.
-5-
4F-3, No.5, Technology Rd., Science-Based
Industrial Park, Hsinchu 30078, Taiwan
Tel: (886) 3577 7509; Fax: (886) 3577 7390
Email: sales@zilltek.com
Microchip MCU
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