For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6900 Series
Standard Application
Ordering Information
+5V Input +3.3V Input Vout
PT6901❏❏
❏❏
❏PT6904❑❑
❑❑
❑= –2.0V
PT6902❏❏
❏❏
❏PT6905❑❑
❑❑
❑= –5.2V
PT6903❑❑
❑❑
❑= –1.5V
Cin = Required 330µF electrolytic
Cout = Required 330µF electrolytic
•+5V/+3.3V Input Voltage
•Negative Output
•Remote Sense
•Adjustable Output Voltage
•23-pin SIP Package
The PT6900 is a series of high-
performance ISRs, that provide plus to
minus voltage conversion, up to 12 watt
in a 23-pin SIP package.
Pin Function
1Do not connect
2V
out Adjust
3V
in
4V
in
5V
in
6V
in
7V
in
8Remote Sense GND
9 GND
10 GND
11 GND
12 GND
Pin Function
13 GND
14 GND
15 GND
16 Vout
17 Vout
18 Vout
19 Vout
20 Vout
21 Vout
22 Remote Sense Vout
23 Do not connect
Pin-Out Information
The PT6900 is designed to supply
regulated negative voltages for power-
ing the latest ECL (-5.2V) and GaAs
(-2.0V) ICs used in high-speed fiber
optic communications. A 330µF elec-
trolytic capacitor is required on the
input and output for proper operation.
Please note that this product is not
short-circuit protected.
(For dimensions and PC board layout,
see Package Styles 1100 and 1110.)
CoutCin
PT6900
16-21
9-15
3-7
2
V
ADJ
-V
OUT
GNDGND
+V
IN
+
+
22
Remote Sense
Remote Sense
8
PT Series Suffix (PT1234X)
Case/Pin
Configuration
Vertical Through-Hole N
Horizontal Through-Hole A
Horizontal Surface Mount C
SLTS041A
(Revised 6/30/2000)
Specifications
Characteristics
PT6900 SERIES
(Ta= 25°C unless noted) Symbols Conditions Min Typ Max Units
Output Current IoTa = +25°C, natural convection
Vin =5.0V Vo = –2.0V / –1.5V 0.1 (1) —6.0
(2) A
Vo = –5.2V 0.1 (1) —3.5
(2)
Vin =3.3V Vo = –2.0V 0.1 (1) —5.0
(2) A
Vo = –5.2V 0.1 (1) —2.5
(2)
Input Voltage Range 0.1A ≤ Io ≤ Imax PT6901 PT6902/PT6903 4.5 — 5.5
PT6904/PT6905 3.1 — 3.6 V
Output Voltage Tolerance ∆VoNominal Vin, Io = Imax Vo – 0.05 — Vo + 0.05 V
0°C ≤ Ta ≤ +60°C
Output Adjust Range VoPin 14 to Vo or GND Vo = –2.0V –1.4 — –4.4
Vo = –5.2V –2.7 — –6.5 V
Vo = –1.5V –1.2 — –3.4
Line Regulation Regline Over Vin range, Io =Imax — ±0.5 ±1.0 %
Load Regulation Regload Vin =Vnom, 0.1 ≤ Io ≤ Imax — ±0.5 ±1.0 %
Vo Ripple/Noise VnVin = Vnom, Io =Imax Vo = –1.5V / –2.0V — 40 — mV
Vo = –5.2V — 50 —
Transient Response ttr Io step between 0.5xImax and Imax — 200 — µSec
with Cout = 330µF Vos Vo over/undershoot — 200 — mV
Efficiency ηVin =+5V, Io =0.5xImax Vo = –1.5V — 65 —
Vo = –2.0V — 70 — %
Vo = –5.2V — 77 —
Vin = +3.3V, Io =0.5xImax Vo = –2.0V — 67 — %
Vo = –5.2V — 75 —
Switching Frequency ƒoOver Vin and Io ranges 500 — 600 kHz
Absolute Maximum TaOver Vin Range 0 — +85 (2) °C
Operating Temperature Range
Storage Temperature Ts-40 — +125 °C
Weight — Vertical/Horizontal — 28/33 — grams
Notes:
(1) ISR-will operate down to no load with reduced specifications.
(2) See SOA curves or contact the factory for the approrpiate derating.
12 Watt 5V/3.3V Input
Plus to Minus Voltage Converter
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Typical Characteristics
3.3V Input Voltage (See Note A)
Efficiency vs Output Current Efficiency vs Output Current
5.0V Input Voltage (See Note A)
Ripple vs Output Current Ripple vs Output Current
Power Dissipation vs Output Current Power Dissipation vs Output Current
Safe Operating Area, PT6901 (Vin =5.0V) (See Note B) Safe Operating Area, PT6902 (Vin =5.0V) (See Note B)
Note A: All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the DC-DC Converter.
Note B:
SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum operating temperatures
PT6900 Series
12 Watt 5V/3.3V Input
Plus to Minus Voltage Converter
40
50
60
70
80
90
0123456
Iout (A)
Efficiency - %
PT6902
PT6901
PT6903
0
2
4
6
8
0123456
Iout (A)
Pd - Watts
PT6902
PT6901
PT6903
0
10
20
30
40
50
0123456
Iout (A)
Ripple - mV
PT6902
PT6901
PT6903
50
60
70
80
90
012345
Iout (A)
Efficiency - %
PT6905
PT6904
0
2
4
6
8
012345
Iout (A)
Pd - Watts
PT6905
PT6904
0
10
20
30
40
012345
Iout (A)
Ripple - mV
PT6905
PT6904
20
30
40
50
60
70
80
90
0123456
Iout (A)
Ambient Temperature ( C)
200LFM
120LFM
60LFM
Nat conv
Airflow
20
30
40
50
60
70
80
90
00.511.522.533.54
Iout (A)
Ambient Temperature ( C)
200LFM
120LFM
60LFM
Nat conv
Airflow
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6900/6910 Series
Adjusting the Output Voltage of the PT6900/PT6910
Positive to Negative Converter Series
The negative output voltage of the Power Trends
PT6900 Series ISRs may be adjusted higher or lower
than the factory trimmed pre-set voltage with the addi-
tion of a single external resistor. Table 1 gives the
allowable adjustment range for each model in the series
as Va (min) and Va (max).
Adjust Up: An increase in the output voltage is
obtained by adding a resistor R2, between pin 2 (Vo ad-
just) and pin 8 (Remote Sense GND).
Adjust Down: Add a resistor (R1), between pin 2 (Vo
adjust) and pin 22 (Remote Sense Vo).
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, either (R1) or R2 as appropriate.
Notes:
1. Only a single 1% resistor is required in either the (R1) or
R2 location. Do not use (R1) and R2 simultaneously.
Place the resistor as close to the ISR as possible.
2. Never connect capacitors from V
o
adjust to either GND,
V
out
, or the Sense pins. Any capacitance added to the
V
o
adjust pin will affect the stability of the ISR.
3. If the sense pins are not being used, the resistors (R1) and
R2 can be connected to V
out
and GND respectively.
4. An increase in the output voltage must be accompanied by
a corresponding reduction in the maximum output current.
The revised maximum output current must be reduced to
the equivalent of 12Watts.
i.e. Iout (max) = 12 Adc,
Va
where V
a
is the adjusted output voltage.
Figure 1
The respective values of (R1) [adjust down], and R2 [ad-
just up], can also be calculated using the following formulas.
(R1) = 24.9 (Va – Vr)– RskΩ
(Vo – Va)
R2 = 24.9 Vr– RskΩ
(Va – Vo)
Where:
Vo= Original output voltage
Va= Adjusted output voltage
Vr= Reference voltage in Table 1
Rs= The resistance given in Table 1
Table1
PT6900/PT6910 ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
5.0V Bus PT6903/13 PT6901/11 PT6902/12
3.3V Bus PT6904/14 PT6905/15
Vo (nom) -1.5V -2.0V -5.2V
Va (min) -1.2V -1.4V -2.7V
Va (max) -3.4V -4.5V -6.5V
Vr-1.0V -1.0V -0.92V
Rs (kΩΩ
ΩΩ
Ω)12.7 10.0 17.4
C
in
+
C
out
+
R2
(Up)
(R1)
(Down)
COMCOM
Vout(-)+Vin PT6900
16 - 21
29 - 15
3 - 7 +Vin -Vo
GND Vo(adj)
Vo(sense)
22
8
GND(sense)
L
O
A
D
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
continued
PT6900/PT6910 ADJUSTMENT RESISTOR VALUES
Series Pt #
5.0V Bus PT6903/13 PT6901/11 PT6902/12
3.3V Bus PT6904/14 PT6905/15
Vo (nom) –1.5Vdc –2.0Vdc –5.2Vdc
Va (req’d)
–1.2 (3.9)kΩ
–1.3 (24.7)kΩ
–1.4 (86.9)kΩ(6.6)kΩ
–1.5 (14.9)kΩ
–1.6 236.0kΩ(27.4)kΩ
–1.7 112.0kΩ(48.1)kΩ
–1.8 70.3kΩ(89.6)kΩ
–1.9 49.6kΩ(214.0)kΩ
–2.0 37.1kΩ
–2.1 28.8kΩ239.0kΩ
–2.2 22.9kΩ115.0kΩ
–2.3 18.4kΩ73.0kΩ
–2.4 15.0kΩ52.3kΩ
–2.5 12.2kΩ39.8kΩ
–2.6 9.9kΩ31.5kΩ
–2.7 8.1kΩ25.6kΩ(0.3)kΩ
–2.8 6.5kΩ21.1kΩ(2.1)kΩ
–2.9 5.1kΩ17.7kΩ(4.0)kΩ
–3.0 3.9kΩ14.9kΩ(6.1)kΩ
–3.1 2.9kΩ12.6kΩ(8.5)kΩ
–3.2 2.0kΩ10.8kΩ(11.0)kΩ
–3.3 1.1kΩ9.2kΩ(13.8)kΩ
–3.4 0.4kΩ7.8kΩ(16.9)kΩ
–3.5 6.6kΩ(20.4)kΩ
–3.6 5.6kΩ(24.3)kΩ
–3.7 4.7kΩ(28.7)kΩ
–3.8 3.8kΩ(33.8)kΩ
Series Pt #
5.0V Bus PT6903/13 PT6901/11 PT6902/12
3.3V Bus PT6904/14 PT6905/15
Vo (nom) –1.5Vdc –2.0Vdc –5.2Vdc
Va (req’d)
–3.9 3.1kΩ(39.7)kΩ
–4.0 2.5kΩ(46.5)kΩ
–4.1 1.9kΩ(54.6)kΩ
–4.2 1.3kΩ(64.3)kΩ
–4.3 0.8kΩ(76.1)kΩ
–4.4 0.4kΩ(90.9)kΩ
-4.5 0.0kΩ(106.0)kΩ
–4.6 (135.0)kΩ
–4.7 (171.0)kΩ
–4.8 (224.0)kΩ
–4.9 (313.0)kΩ
–5.0 (491.0)kΩ
–5.1 (1020.0)kΩ
–5.2
–5.3 212.0kΩ
–5.4 97.1kΩ
–5.5 59.0kΩ
–5.6 39.9kΩ
–5.7 28.4kΩ
–5.8 20.8kΩ
–5.9 15.3kΩ
–6.0 11.2kΩ
–6.1 8.1kΩ
–6.2 5.5kΩ
–6.3 3.4kΩ
–6.4 1.7kΩ
–6.5 0.2kΩ
Table 2
R1 = (Blue) R2 = Black
PT6900/6910 Series
PACKAGE OPTION ADDENDUM
www.ti.com 20-Aug-2011
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
PT6901N NRND SIP MODULE EJH 23 10 TBD Call TI Level-1-215C-UNLIM
PT6902C NRND SIP MODULE EJK 23 8 TBD Call TI Level-1-215C-UNLIM
PT6902N NRND SIP MODULE EJH 23 10 TBD Call TI Level-1-215C-UNLIM
PT6903A OBSOLETE SIP MODULE EJJ 23 TBD Call TI Call TI
PT6903C OBSOLETE SIP MODULE EJK 23 TBD Call TI Call TI
PT6903N OBSOLETE SIP MODULE EJH 23 TBD Call TI Call TI
PT6904A OBSOLETE SIP MODULE EJJ 23 TBD Call TI Call TI
PT6904C OBSOLETE SIP MODULE EJK 23 TBD Call TI Call TI
PT6904N OBSOLETE SIP MODULE EJH 23 TBD Call TI Call TI
PT6905N NRND SIP MODULE EJH 23 10 TBD Call TI Level-1-215C-UNLIM
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
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TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
PACKAGE OPTION ADDENDUM
www.ti.com 20-Aug-2011
Addendum-Page 2
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