For technical support and more information, see inside back cover or visit www.ti.com
Standard Application
Features
• 8A Rated Output Current
• Single Device: 3.3V/5V Input
• High Efficiency (92% for PT6521)
• Small Footprint (0.75 in², Suffix ‘P’)
• Output On/Off Standby Control
• Output Short-Circuit Protection
• Adjustable Output Voltage
• Soft Startup
• 16-pin Mount Option
(Suffixes L, M, Q, & F)
PT6520 Series
8-A 5-V/3.3-V Input Adjustable ISR
with Short-Circuit protection
SLTS104A
(Revised 1/25/2002)
Pin-Out Information
Pin Function
1 Remote Sense
2 Do Not Connect
3 STBY*
4V
in
5V
in
6V
in
7
GND
8 GND
9 GND
10 GND
11 V
out
12 V
out
13 V
out
14 V
out
Adjust
* For further information, see
application notes.
Description
These power modules are a series of
high performance, 8-A rated, Integrated
Switching Regulators (ISRs), housed in a
low cost 14-Pin SIP (Single In-line Pack-
age). Operating from either a 3.3V or 5V
standard power bus, the PT6520 series
produces a high-output, low-voltage
power source for the industry’s latest
high-speed, microprocessors, ASICs, &
DSPs. This allows for the easy integration
of these new low-voltage ICs into existing
3.3V or 5V systems without re-designing
the power supply.
The PT6520 series features an output
On/Off standby pin and output short-
circuit protection.
C
OUT
+
C
IN
+
LOAD
V
o
ADJ
V
IN
COM
V
OUT
COM
V
o
SENSE
PT6520
11,12,13
14
7–10
4,5,6
3
1
Ordering Information
PT6521¨ = 3.3 Volts
† PT6522¨ = 1.5 Volts
† PT6523¨ = 2.5 Volts
† PT6525¨ = 2.1 Volts
† PT6526¨ = 1.8 Volts
† PT6527¨ = 1.2 Volts
† 3.3V Input Bus Capable
Note:
Back surface of
product is electrically
conductive
PT6520
PT Series Suffix
(PT1234x )
Case/Pin Order Package
Configuration Suffix Code *
Vertical P (EED)
Horizontal D (EEA)
SMD E (EEC)
Horizontal, 2-Pin Tab M (EEM)
SMD, 2-Pin Tab L (EEL)
Horizontal, 2-Pin Ext Tab Q (EEQ)
SMD, 2-Pin Ext Tab F (EEF)
Vertical, Side Tab R (EEE)
Horizontal, Side Tab G (EEG)
SMD, Side Tab B (EEK)
* Previously known as package styles 400/410.
(Reference the applicable package code drawing for the
dimensions and PC board layout)
For technical support and more information, see inside back cover or visit www.ti.com
PT6520 Series
8-A 5-V/3.3-V Input Adjustable ISR
with Short-Circuit protection
Specifications (Unless otherwise stated, T
a
=25°C, V
in
=5V, C
in
=330µF, C
out
=330µF, and I
o
=I
o
max)
PT6520 SERIES
Characteristic Symbol Conditions Min Typ Max Units
Output Current I
o
Over V
in
range 0.1
(1)
— 8.0 A
Input Voltage Range V
in
Over I
o
Range V
o
=3.3V 4.5 — 5.5
VDC
V
o
≤2.5V 3.1 — 5.5
Set Point Voltage Tolerance V
o
tol — ±1 ±1.5 %V
o
Temperature Variation Reg
temp
–40° ≤T
a
≤ +85°C, I
o
=I
o
min — ±0.5 — %V
o
Line Regulation Reg
line
Over V
in
range — ±5 ±10 mV
Load Regulation Reg
load
Over I
o
range — ±5 ±10 mV
Total Output Voltage Variation ∆V
o
tot Includes set-point, line, load,
—±2±3%V
o
–40° ≤T
a
≤ +85°C
Efficiency η I
o
=3.0A V
o
=3.3V — 92 —
V
o
=2.5V — 88 —
V
o
=2.1V — 85 —
%
V
o
=1.8V — 82 —
V
o
=1.5V — 80 —
V
o
=1.2V — 75 —
I
o
=8.0A V
o
=3.3V — 89 —
V
o
=2.5V — 85 —
V
o
=2.1V — 82 —
%
V
o
=1.8V — 78 —
V
o
=1.5V — 75 —
V
o
=1.2V — 71 —
V
o
Ripple (pk-pk) V
r
20MHz bandwidth — 35 — mV
pp
Transient Response t
tr
1A/µs load step, 50% to 100% I
o
max — 50 — µs
∆V
tr
V
o
over/undershoot — ±70 — mV
Short Circuit Threshold I
sc
threshold — 12 22.5 A
Switching Frequency ƒ
s
Over V
in
and I
o
range 300 350 400 kHz
Remote On/Off (Pin 1) Referenced to –V
in
(pin 7)
Input High Voltage V
IH
— — Open
(2)
V
Input Low Voltage V
IL
–0.1 — +0.4
Input Low Current I
IL
— –0.5 – mA
Standby Input Current I
in
standby pins 3 & 7 connected — 15 25 mA
External Output Capacitance C
out
See application schematic 330 — 5,000 µF
External Input Capacitance C
in
See application schematic 330 — — µF
Operating Temperature Range T
a
Over V
in
range -40 — +85
(3)
°C
Storage Temperature T
s
— -40 — +125 °C
Reliability MTBF Per Bellcore TR-332
6.3 — — 10
6
Hrs
50% stress, T
a
=40°C, ground benign
Mechanical Shock — Per Mil-Std-883D, method 2002.3, — 500 — G’s
1ms, half-sine, mounted to a fixture
Mechanical Vibration — Suffixes P, D, & E — 7.5 —
G’s
Mil-Std-883D, 20-2000Hz Suffixes L & M — TBD
(4)
—
Weight — Suffixes P, D, & E — 12.5 —
Suffixes R, G & B — 16.5 — grams
Suffixes L & M — 15.25 —
Suffixes Q & F — 22 —
Flammability — Materials meet UL 94V-0
Notes: (1) The ISR will operate at no load with reduced specifications.
(2) The STBY* control (pin 3) has an internal pull-up and if it is left open circuit the module will operate when input power is applied. The open-circuit
voltage is typically 12.6V, and maybe as high as 15V. Refer to the application notes for other interface considerations.
(3) See Safe Operating Area curves or contact the factory for the appropriate derating.
(4) The tab pins on the 16-pin mount package types (suffixes L & M) must be soldered. For more information see the applicable package outline drawing.
Input/Output Capacitors:
The PT6520 series requires a 330µF capacitor at both the input and output for proper operation in all applications. In addition, the input
capacitance (C
in
) must be rated for a minimum of 1.2Arms ripple current rating. For transient or dynamic load applications, additional output capacitance (C
out
) may be
necessary. The maximum allowable output capacitance is 5,000µF. For more information consult the related application note on capacitor recommendations.
For technical support and more information, see inside back cover or visit www.ti.com
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures
Typical Characteristics
PT6520 Series
8-A 5-V/3.3-V Input Adjustable ISR
with Short-Circuit protection
Characteristic Data; V
in
=5.0V (See Note A) Characteristic Data; V
in
=3.3V (See Note A)
Efficiency vs Output Current Efficiency vs Output Current
Power Dissipation vs Output Current Power Dissipation Output Current
Safe Operating Area; 3.3V (See Note B) Safe Operating Area; V
in
=5V (See Note B)
0
5
10
15
20
25
30
35
40
012345678
Iout
(
A
)
Ripple - mV
3.3V
2.5V
1.8V
1.2V
V
OUT
0
1
2
3
4
5
012345678
Iout
(
A
)
Pd - Watts
1.2V
1.8V
2.5V
3.3V
V
OUT
0
5
10
15
20
25
30
35
40
012345678
Iout
(
A
)
Ripple - mV
2.5V
1.8V
1.2V
V
OUT
Output Ripple vs Output Current
Output Ripple vs Output Current
0
1
2
3
4
5
012345678
Iout
(
A
)
Pd - Watts
1.2V
1.8V
2.5V
V
OUT
20
30
40
50
60
70
80
90
012345678
Iout
(
A
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat conv
Airflow
40
50
60
70
80
90
100
012345678
Iout
(
A
)
Efficiency - %
3.3V
2.5V
1.8V
1.2V
V
OUT
40
50
60
70
80
90
100
012345678
Iout
(
A
)
Efficiency - %
2.5V
1.8V
1.2V
V
OUT
20
30
40
50
60
70
80
90
012345678
Iout
(
A
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat conv
Airflow