LTC3226
TYPICAL PERFORMANCE CHARACTERISTICS
Leakage Balancer Source and
Sink Capability
12
V
IN
= 3.3V, V
CPO
= 5V
10 VMID SHUNT REG OFF
8
VMID CURRENT (mA)
6
4
2
0
–2
–4
–6
–8
0
0.5
1
VMID
SINKING
CURRENT
1.5 2 2.5 3 3.5
VMID VOLTAGE (V)
4
4.5
5
VMID
SOURCING
CURRENT
90°C
25°C
–45°C
2.70
2.65
VMID VOLTAGE (V)
2.60
2.55
2.50
2.45
2.40
0.1
T
A
= 25°C, unless otherwise noted.
Ideal Diode Gate Current
vs (V
IN
-V
OUT
)
FAST
OFF
LINEAR
REGION
VMID Shunt Regulator Voltage
vs Current and Temperature
ONLY LEAKAGE
BALANCER
ACTIVE
SHUNT
REGULATOR
ACTIVE
5
4
3
2
I
GATE
(µA)
1
0
–1
–2
–3
–4
V
IN
= 3.3V
V
CPO
= 5V
90°C
25°C
–45°C
1
10
100
VMID CURRENT (mA)
1000
3226 G11
FORWARD
VOLTAGE
FAST
ON
–5
–100
–50
0
50
V
IN
– V
OUT
(mV)
100
3226 G12
3226 G10
Charge Profile When Top
Capacitor = Bottom Capacitor
6
5
4
VOLTAGE (V)
3
2
1
0
–1
1x
MODE
2x
MODE
R
PROG
= 33.2k
C
SC
= 1.2F
3226 G13
Charge Profile When Top
Capacitor > Bottom Capacitor
6
5
4
VOLTAGE (V)
3
2
1
0
–1
1x
MODE
V
MID
CLAMPED
2x
(SHUNT ACTIVE)
MODE
R
PROG
= 33.2k, C
SC
= 1.2F
EXTRA 1.5F BETWEEN CPO
AND V
MID
3226 G14
CPO
V
IN
V
MID
V
IN
CPO
V
MID
TIME (5 SECONDS/DIV)
TIME (5 SECONDS/DIV)
Charge Profile When Top
Capacitor < Bottom Capacitor
6
5
4
VOLTAGE (V)
3
2
1
0
–1
1x
MODE
2x
MODE
V
MID
TOP CAP
CLAMPED
R
PROG
= 33.2k,
,
C
SC
= 1.2F EXTRA
1.5F BETWEEN
V
MID
AND GND
3226 G15
Normal-to-Back-Up Mode
Switching Transient Waveform
4
V
OUT
V
IN
CPO
VOLTAGE (V)
3
V
IN
2
PFO
(1V/DIV)
C
SC
= 1.2F
C
OUT
= 47µF
I
LOAD
= 2A
0
100
200
300
TIME (µs)
400
500
3226 G16
1
TIME (5 SECONDS/DIV)
0
3226f
6
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
