T
echcode
®
Step-up DC/DC Controller
Features
DATASHEET
TD8215
General Description
The TD8215 is a single PWM, step‐up DC‐DC controller with
low operating voltage application integrating softstart and
short circuit detection function. The oscillator switching
frequency on chip can be operated by terminating OSC pin to
connect capacitor and resistor for adjustable operating
frequency. Soft‐start is adjusted with the external capacitor,
which sets the input current ramp. Besides, the external
compensation FB pin will apply the flexibility in the dynamic
loop status, which allows using small and low equivalent
series resistance (ESR) ceramic output capacitors.
The TD8215 is available in a Pb‐free, SOP‐8 and
TSSOP‐8package.
2.5 to 5.5V Input Voltage Range
Adjustable Frequency: Maximum 1MHZ
Incorporates Soft‐Start Function
Built‐in Short‐Circuit Detection Circuit (SCP)
Low Operating Current: Maximum to 1mA
Low Shutdown Current: Maximum to 1µA
Under‐Voltage Lockout
Package: SOP‐8 and TSSOP‐8
Lead Free and Green Devices Available (RoHS
Compliant)
Applications
LCD Display Power Source
PDA, PMP, MP3
Digital Camera
Pin Configurations
Figure1 Pin Configuration of TD8215(Top View)
March, 20, 2013.
Techcode Semiconductor Limited
www.techcodesemi.com
1
T
echcode
®
Step-up DC/DC Controller
DATASHEET
TD8215
Pin Description
Pin Number
Pin Name
Description
1
2
3
4
5
6
7
8
INV
SCP
VDD
CTL
OUT
GND
OSC
FB
Internal 0.5V reference voltage. Use a resistor divider to set the output voltage
Soft‐start and short‐circuit detection, connects a capacitor from the pin to ground.
Power supply input pin for IC voltage
Output control pin. Low = operating mode; High = shutdown mode.
External MOSFET driving pin.
GND
Setting capacitor and resister to provide oscillation switching frequency adjustment.
GND
Ordering Information
TD8215
□
Circuit Type
Packing:
Blank：Tube
R: Tape and Reel
P: SOP-8
T: TSSOP-8
□
March, 20, 2013.
Techcode Semiconductor Limited
www.techcodesemi.com
2
T
echcode
®
Step-up DC/DC Controller
DATASHEET
TD8215
Function Block
Figure 2 Function Block Diagram of TD8215
Absolute Maximum Ratings
Symbol
V
DD
V
IO
T
A
T
J
T
STG
T
SDR
Supply Voltage
Input/Output Pins
Operating Ambient Temperature Range
Junction Temperature Range
Storage Temperature Range
Maximum Lead Soldering Temperature, 10 Seconds
Parameter
Rating
‐0.3 to 7
‐0.3 to 7
‐40 to 85
‐40 to 150
‐60 to 150
260
Unit
V
V
o
C
C
C
o
o
o
C
Recommended Operating Conditions
Symbol
V
DD
Parameter
Min.
Supply Voltage
2.5
Rating
Typ.
‐
Unit
Max.
5.5
V
March, 20, 2013.
Techcode Semiconductor Limited
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3
T
echcode
®
Step-up DC/DC Controller
V
INV
V
CTL
C
SCP
R
T
C
T
F
SW
Error Amplifier Invert Input Voltage
Control Pin Input Voltage
SCP Pin Capacitor
Timing Resistance
Timing Capacitor
Oscillator Frequency
‐0.2
‐0.2
‐
1.0
100
200
‐
‐
0.1
3.3
‐
600
DATASHEET
TD8215
1
V
DD
‐
10
270
1000
V
V
µF
KΩ
pF
KHz
Electrical Characteristics
(V
DD
= 3.3V, TA = 25°C unless otherwise specified)
Parameters
ENTIRE DEVICE
Supply Voltage
Supply Current
Shutdown Current
Maximum Duty Cycle
UNDER‐VOLTAGE LOCKOUT PROTECTION
VDD Startup Threshold Voltage
Hysteresis voltage
SOFT‐START
Voltage at Soft‐Start Completion
Soft‐Start Charge Current
Voltage at Soft‐Start Completion
Soft‐Start Charge Current
SHORT CIRCUIT PROTECTION (SCP)
Threshold Voltage
Charge Current
Symbol
Test Condition
Min.
Typ.
Max.
Unit
V
DD
I
DD
I
SD
D
MAX
V
DD
=2.5V to 5.5V
CTL pin open or VDD
R
T
=3.3K, C
T
=270pF
2.5
‐
‐
80
‐
0.7
0.1
85
5.5
1
1
92
V
mA
µA
%
V
TH
V
R
‐
‐
2.0
‐
‐
150
2.4
‐
V
mV
V
SS
I
CS
V
SS
I
CS
‐
V
SCP
=0V
‐
V
SCP
=0V
0.7
‐0.7
0.7
‐0.7
0.8
‐1.0
0.8
‐1.0
0.9
‐1.5
0.9
‐1.5
V
µA
V
µA
V
SCP
I
SCP
V
SCP
=0V
0.7
‐0.7
0.8
‐1.0
0.9
‐1.5
V
µA
SAWTOOTH WAVEFORM OSCILLATOR (OSC)
Oscillator Frequency
Frequency Stability for Voltage
Frequency Stability for Temperature
F
OSC
F
DV
F
DT
R
T
=3.3k, C
T
=270pF
V
DD
=2.5V to 5.5V
T
A
=‐40°C to 85°C
500
‐
‐
600
2
5
700
5
‐
kHz
%
%
March, 20, 2013.
Techcode Semiconductor Limited
www.techcodesemi.com
4
T
echcode
®
Step-up DC/DC Controller
ERROR AMPLIFIER
Reference Voltage
V
REF
Stability
V
REF
Variation with Temperature
Transconductance
Input Bias Current
Output Voltage Range
V
REF
gm
I
B
V
OH
V
OL
Output Source Current
Output Sink Current
PWM CONTROLLER DRIVER
Output Source Current
Output Sink Current
CONTROL BLOCK
Control Voltage
V
IL
V
IH
Active mode
Switch‐off mode
‐
0.8V
DD
‐
‐
I
SOURCE
I
SINK
Duty<5%, OUT=0V
Duty>5%, OUT=5V
‐150
150
‐200
200
V
FB
=INV
V
DD
=2.5V to 5.5V
T
A
=‐40°C to 85°C
INV=0V
‐
INV=0V,FB=0.5V
INV=1V,FB=0.5V
0.493
‐
‐
1000
‐
1.6
‐
‐150
140
0.5
5
1
1300
‐
1.8
‐
‐180
170
DATASHEET
TD8215
0.508
20
‐
1600
1
‐
0.01
‐210
200
V
mV
%
µA/V
µA
V
V
µA
µA
‐
‐
mA
mA
0.2VDD
‐
March, 20, 2013.
Techcode Semiconductor Limited
www.techcodesemi.com
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